SCS PTC-IIex Manual Download Page 12

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Table of Contents

13.4.6

Led ............................................................................ 165

13.4.7

Quit ........................................................................... 165

13.4.8

RUN .......................................................................... 165

Circuit Description .................................................. 166

14.1

The Processor section .............................................. 166

14.2

The shortwave modem with signal processor ........... 166

14.3

The Power supply ..................................................... 167

14.4

The Indicator Unit ...................................................... 168

14.5

The Construction ....................................................... 168

Basics....................................................................... 170

15.1

Why PACTOR? ......................................................... 170

15.2

Why PACTOR-II ? ..................................................... 171

15.3

Basics of the PACTOR-II protocol ............................. 172

15.3.1

General ..................................................................... 172

15.3.2

The modulation system ............................................. 173

15.3.3

Error control coding ................................................... 175

15.3.4

Online data compression ........................................... 177

15.4

PACTOR-II in practice ............................................... 178

15.4.1

General points ........................................................... 178

15.4.2

The tuning indicator and tuning behavior .................. 178

15.4.3

Speed and robustness .............................................. 179

15.4.4

CQ calls and broadcasts ........................................... 180

History ...................................................................... 182

Accessories ............................................................. 184

Technical Data ......................................................... 186

Layout ...................................................................... 188

Circuits ..................................................................... 191

Connector Pin-out ................................................... 195

Glossary ................................................................... 197

Summary of Contents for PTC-IIex

Page 2: ...und we ask your forgiveness and request you send us a short note pointing them out Your SCS Team Attention Very Important You should connect the power supply plug to the PTC IIex only when the power s...

Page 3: ...to the following two conditions 1 This device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation This...

Page 4: ...nsceiver 10 3 3 1 Connection to ICOM transceivers 12 3 3 2 Connection to Kenwood transceivers 13 3 3 3 Connection to Yaesu transceivers 13 3 3 4 Amplitude Adjustment 14 4 LED s 17 4 1 PACTOR III 18 5...

Page 5: ...ency 34 5 13 Audio Functions 35 5 14 The hostmode 35 6 Commands 37 6 1 ACheck AMTOR Check 37 6 2 ADdlf 37 6 3 Amtor 37 6 4 APower 38 6 5 AQrg 39 6 6 ARX 39 6 7 AUdio 40 6 8 BAKup 40 6 9 BAUdot 41 6 10...

Page 6: ...6 52 LOGIn Remote 59 6 53 MAil 59 6 54 MARk 60 6 55 MAXDown 60 6 56 MAXErr 60 6 57 MAXSum 61 6 58 MAXTry 61 6 59 MAXUp 61 6 60 MOde 61 6 61 MONitor 62 6 62 MYcall 63 6 63 MYLevel 63 6 64 MYSelc 63 6...

Page 7: ...Term 78 6 94 TIme Remote 80 6 95 TNC 81 6 96 TOnes 82 6 97 TR 83 6 98 TXDelay 83 6 99 UMlauts 84 6 100 Unproto 84 6 101 UPDATE 85 6 102 USer Remote 85 6 103 USOs Unshift On Space 86 6 104 VERIfy 86 6...

Page 8: ...7 7 Comparator 104 8 7 8 PR300 105 8 8 Transmission during MODEM operation 105 8 8 1 Transmission in AM FAX Modem mode 105 8 8 2 Transmission in FM FAX FSK SSTV Modem mode 106 8 8 3 Transmission in C...

Page 9: ...GIpeat 122 9 6 12 Disconnect 122 9 6 13 FRack 122 9 6 14 Help 123 9 6 15 JHOST 123 9 6 16 KISS 123 9 6 17 MAXframe 123 9 6 18 MCon 123 9 6 19 MFIlter 124 9 6 20 Monitor 124 9 6 21 MStamp 125 9 6 22 MT...

Page 10: ...10 4 22 F 138 10 4 23 K 139 10 4 24 S 139 10 4 25 T2 139 10 4 26 T3 140 10 4 27 B 140 10 4 28 C 140 10 4 29 E 140 10 4 30 I 140 10 4 31 L 140 10 4 32 M 141 10 4 33 O 141 10 4 34 Q 141 10 4 35 T 141 10...

Page 11: ...2 2 AUDPerm 156 12 3 Beep 157 12 4 DD 157 12 5 Fsk 157 12 6 Help 157 12 7 Kill 157 12 8 Led 157 12 9 MONitor 158 12 10 Ptt 158 12 11 PLl 158 12 12 Quit 158 12 13 Ram 158 13 The BIOS 160 13 1 BIOS and...

Page 12: ...5 2 Why PACTOR II 171 15 3 Basics of the PACTOR II protocol 172 15 3 1 General 172 15 3 2 The modulation system 173 15 3 3 Error control coding 175 15 3 4 Online data compression 177 15 4 PACTOR II in...

Page 13: ...3 6 KENWOOD 6 pin Mini DIN 13 Table 3 7 Yaesu connection 13 Table 3 8 YAESU 6 pin Mini DIN 14 Table 3 9 YAESU 6 pin Mini DIN 14 Table 4 1 PACTOR III Speedlevels 18 Table 5 1 Command prompts 20 Table 5...

Page 14: ...List of Figures and Tables XII...

Page 15: ...nal that provides an serial interface compatible with the RS232 V24 standard If you use a computer you need a appropriate terminal program to operate the serial interface with the following parameters...

Page 16: ...nd your service provider The email client e g Airmail automaticly does most of the configurations needed and lets you successfully transfer email at a fraction of knowledge which this book presents So...

Page 17: ...ail WIN Alpha WIN Easyterm EZT3271 WIN EasyTransfer WIN EasyUpdate WIN GSH PC DOS JVComm32 WIN JVFAX DOS Kptc Linux Mscan Meteo Fax WIN Mscan Meteo Pro WIN Mscan SSTV WIN Mscan for DOS DOS NCWinPTC WI...

Page 18: ...the programs for the PC and the user manual The different version numbers are necessary to distinguish between old and new versions 1 5 3 File types Basicly the following file types extentions are us...

Page 19: ...OR III can achieve its maximum speed with using unmodified common SSB transceivers The occupied bandwidth is around 2200 Hz Thus PACTOR III is the ideal means of fast and reliable data communication o...

Page 20: ...ink Extreme compression of the TCP IP and PPP overhead Full PPP compatibility Use of common client server software like Netscape Outlook Eudora and others is possible Easy embedding and configuration...

Page 21: ...63454 Hanau Germany Fax 49 6181 23368 Order Fax 49 6181 990238 EMail info scs ptc com Homepage Visit our Internet sites http www scs ptc com Here you will find Information to PACTOR and our modems The...

Page 22: ...note to the shipment Do this always also if you have emailed us or talked to us previously Describe the problem as good as you can Write clearly Don t forget your return address If the PTC IIex shows...

Page 23: ...a self resetting fuse 3 2 The serial interface RS232 V24 The SCS PACTOR controller communicates with the computer or terminal via a serial interface using the RS232 V24 standard For communication betw...

Page 24: ...ifferent and has nothing whatsoever to do with simple FSK It is therefore IMPOSSIBLE to use the FSK modulators found in some transceivers to generate the signal The PACTOR II signal must always go via...

Page 25: ...ver gives a power supply output via the AUX socket Th maximum of 0 3 A cable connec he PT IIex to PIN Color PIN Color 1 Violet 5 Blue 2 White 6 Red 3 Yellow 7 Black 4 Green 8 Brown Table 3 1 Cable Col...

Page 26: ...n to ICOM transceivers Most ICOM transceivers that use 8 pin DIN plug ACC can be connected this way Signal PTC Color ICOM 8 pin GND PIN 2 white PIN 2 PTT PIN 3 yellow PIN 3 AF OUT PIN 1 violet PIN 4 A...

Page 27: ...IN PIN 4 green PIN 6 Table 3 5 Kenwood TS 50 connection The TS 480 has a 6 pin Mini DIN connector Signal PTC Color YAESU GND PIN 2 white PIN 2 PTT PIN 3 yellow PIN 3 AF OUT PIN 1 violet PIN 1 AF IN P...

Page 28: ...ice not the best way The audio input sensitivity of most transceivers is adapted to the output voltage of a common dynamic microphone 100 modulation is reached at low MIC Gain settings with 200 mV Pea...

Page 29: ...t damage from the transceiver at continuous operation we recommend to limit the FSK output level to half of the maximum possible that means 50 W if the transceiver is made for 100 W at max 3 3 4 1 PAC...

Page 30: ...3 Installation 16...

Page 31: ...Send PTT lights when the PTC is actually the information sending station In Packet Radio mode Send PTT lights when the PTT is keyed and the transceiver is transmitting DQPSK DBPSK Is actice when rece...

Page 32: ...After a firmware update the firmware needs to be copied to the 32 bit wide SRAM loading This condition is indicated with each second LED being on and off Update When the firmware or the BIOS are upda...

Page 33: ...prompt is available immediately after the last command The PTC IIex is in the command mode The command mode is displayed with the system prompt cmd or pac During link set up and while connected the P...

Page 34: ...ow significant mnemonics are printed in capital letters The short form of the SERBaud command is SERB 5 3 Menus The PTC IIex commands are combined into different function groups so called menus The di...

Page 35: ...ise an error message is displayed When the command is accepted automaticly the DSP is switched to Packet Radio operation and the pac menu is activated In fact the PTC IIex automaticly loads the requir...

Page 36: ...e Sysop Chapter 6 11 Check Lists actual mails Chapter 6 17 CLr Erase the transmit buffer Chapter 6 20 DAte Calls up the PTC date Chapter 6 33 DELete Erase a file or files Chapter 6 35 DIR Read the mai...

Page 37: ...lo g c heck cl r l ist s end be ll u ser pos ition characters within brackets are optional For more information type h command eg help send next Display 5 7 1 PACTOR mailbox help At Read and Send comm...

Page 38: ...ion Requests GPS position Chapter 6 72 Table 5 3 PACTOR mailbox commands Of course it is possible to enter mailbox commands on the console With the DIR and LIst command you can check the mailbox conte...

Page 39: ...MYCALL 8 either at the first start when the Flash Call in the BIOS has been defined or when ones own PACTOR MYCALL has been set If for example DL1ZAM is given as the first PACTOR MYCALL then the PR ma...

Page 40: ...n to without problem AUTO BIN transfer or similar protocols are at present not supported by the PR mailbox Uppercase and lowercase letters are not distinguished in the command processing All commands...

Page 41: ...ty input only Return interrupts the file read operation User Lists the presently active links similar to the CStatus command in the pac menu A presently active PACTOR link is displayed in channel 0 of...

Page 42: ...energy supply of a small ship A NAVTEX controller should therefore be able to operate without any additional computer and use little electrical energy itself The NAVTEX processor of the PTC IIex solv...

Page 43: ...bers in consecutive operation An exception can occur in the very numerous Navigational Warning messages That is why there are two different message type letters A and L which actually describe the sam...

Page 44: ...its special definition of possible message types which have been adjusted for amateur radio usage The existing NAVTEX processor in the PTC II is thus very suitable for fully automatic reception of AM...

Page 45: ...aves the actual position with the corresponding GPS time The user can call up this position data with the POSition command in the cmd menu The PTC IIex accepts messages in formats GPRMC GPGLL IIRMC an...

Page 46: ...data throughput What are the reasons then that up until now HF PR works so poorly and apart from forwarding is hardly ever used There is a simple answer The current modulation type for HF PR namely un...

Page 47: ...to be sent are available 2 If the PTC IIex is the information receiving station IRS the PTC II automatically executes a BREAKIN if the transmission buffer is not empty that means that data for transmi...

Page 48: ...in the same way as in PR regardless of the actual transmission state of the connected PTCs CHANGEOVER or BREAKIN aren t necessary anymore We want to point out that the selection of the QSO style is a...

Page 49: ...volume control should be used which enables comfortable loudspeaker operation The very high computing capacity of the PTC IIex is shown to be very advantageous for the Audio processing algorithm In c...

Page 50: ...this there are special hostmode command which allow the changeover for PACTOR in the hostmode O causes a CHANGEOVER and I causes a BREAKIN Another comfortable way to initiate a CHANGEOVER in the hostm...

Page 51: ...wever markedly reduced printing errors Higher values 40 60 are recommended for APLINK where data is sent over multiple AMTOR links until the target box is reached and thus a minimum error rate is to b...

Page 52: ...e unreadable text In an AMTOR QSO instead of using the usual change over sequence it is possible to use the normal PACTOR CHANGEOVER character The PTC changes the PACTOR CHANGEOVER character automatic...

Page 53: ...compensated switching off this function which is essential for PSK operation is not possible AQrg 1 activates the second additional compensation method The PTC IIex pulls the two carrier frequencies...

Page 54: ...up the entire PTC mailbox After entering the BAK command the PTC requests a disk file to be opened and waits for the input of a CR which starts the actual back up procedure After the back up is finis...

Page 55: ...deal value After BAU the PTC answers with BAUDOT RTTY RECEPTION ACTIVE SPEED 45 BD and is ready to receive RTTY transmissions Changing to transmit is done with the CHANGEOVER character set with the CH...

Page 56: ...or PACTOR and AMTOR The BREAKIN character is a special command for a forced direction change from RX to TX BREAKIN Because this command is used very often the PTC accepts the BREAKIN character only di...

Page 57: ...tions This increases the Overhead of the box only very slightly as the callsigns are given in small letters and thus lend themselves to efficient Huffman coding If the remote user wants enter a comman...

Page 58: ...nd let it beep CHOB 0 disables both the sending of the BEL character to the terminal and the beep of the internal buzzer 6 19 CHOchr Default setting 25 Ctrl Y Parameter X 1 127 decimal ASCII code of a...

Page 59: ...ween 2 and 8 characters Too short arguments are ignored If the callsign is too long it will be truncated at the end If no argument is given the old or the default callsign will be called Connect can b...

Page 60: ...Firmware are able to accept Robust Connect frames Two PTC II s both running the normal Firmware cannot mutually connect using the Robust Connect since only the Professional Firmware is capable of rece...

Page 61: ...the time delay caused by the final speed of radio waves DX is only possible with fast transmit receive switching 6 25 CTExt Default setting PTC IIex DSP QUICC System Maildrop QRV Parameter String of 2...

Page 62: ...RQ connect 2 Audio Only CW identification refer to text 3 Combination of 1 and 2 Automatic CW identification is given after a transmission of approximately 7 minutes and after QRT The CW identificatio...

Page 63: ...nuously between 40 and 1200 LpM Letters per minute The CW speed applies to the CW ID as well as to the CW terminal 6 30 CWTerm Default setting no Parameter X 40 400 Start receiving speed in LpM The CW...

Page 64: ...tuning indicator flicker With a correctly adjusted CW signal the traffic LED lights when the CW signal is there and the idle LED when it is not The Audio frequency of the CW terminal is defined by use...

Page 65: ...ecoded The CW terminal can be closed with the D command or DD may also be used 6 31 CWWeight Default setting 50 Parameter X 5 95 weight of CW characters in This command sets the weighting of the CW ch...

Page 66: ...24 03 05 Return Or in shortform cmd DA 240305 Return 6 34 DD This command causes an immediate breaking off of the transmission Dirty Disconnect An existing link is not correctly terminated Any text th...

Page 67: ...TLE 1 RP DL1ZAM 02 MAR 94 17 13 45 1144 New Info 2 RA DK5FH 02 MAR 94 23 30 22 1502 3 NP DL2FAK 03 MAR 94 13 25 15 1362 Mistake 4 NP DL6MAA 03 MAR 94 23 31 46 927 New Software 5 NP DL3FCI 04 MAR 94 20...

Page 68: ...character is required in order to get a command prompt and input a command Note To ensure proper operation of the PTC IIex s automatic baudrate detection only odd values for the ESCAPE character shou...

Page 69: ...ell matched antenna please pay particular attention that the chosen frequency is really free Using U 1 Return the Unproto mode 1 is started 100 Bd FSK Now using the FSKAmpl command use the ESCAPE char...

Page 70: ...37 LFignore 2 activates in addition the multi CR suppression with RTTY and AMTOR FEC reception Multiple CR in a row without other characters between are suppressed except for the first CR In the EOL...

Page 71: ...in the PTC mailbox The short form L for the LIst command is also accepted by the remote station as in this case no possible confusion with Listen can occur The output format is valid also for the DIR...

Page 72: ...hieving good monitoring results on PACTOR III the frequency offset should kept lower than 20 Hz Of course an SNR appropriate for the actual speedlevel is necessary for error free reception Nevertheles...

Page 73: ...ox in AMTOR a user station must first Login using the LOGIn command e g LOGI DL1ZAM The user s callsign is thus made available to the PTC mailbox Only after a correct LOGIn can the AMTOR user station...

Page 74: ...ust mode during poor channel conditions 2 fast 30 slow Example MAXDown 7 i e the PTC switches down after receiving 7 error packets in a row 6 56 MAXErr Default setting 70 Parameter X 30 255 maximum nu...

Page 75: ...ng 4 Parameter X 2 30 number of error free packets before up speed Selection of up speed parameter for automatic speed changing MAXUp determines how soon the system steps up under good channel conditi...

Page 76: ...aves as if the parameter 1 had been chosen The automatic compression used in PACTOR II has proved to be very advantageous and reliable Therefore the MOde parameter should only need to be changed in ex...

Page 77: ...e is performed if the MYcall command is executed with a valid call as argument in the cmd menu This ensures that after a RESTart or after the first power on all calls are set to a valid value 6 63 MYL...

Page 78: ...ALL Selected MESSAGE TYPES A Navigational Warning B Meteorological Warning D Search and Rescue Info E Meteorological Forecast L Navigational Warning 2 6 65 1 Activating the NAVTEX Processor The NAVTEX...

Page 79: ...and cmd NAV AREA ALL Return allows the reception of messages from all areas The command cmd NAV AREA Return without an argument displays the present area codes chosen 6 65 4 Choosing the message laten...

Page 80: ...de is turned off at which point they become available as usual for NAVTEX reception When the AMTEX configuration is active the AMTEX message types and area codes can be changed as usual e g NAV XYZ or...

Page 81: ...t Radio listen without entering the pac menu previously cmd PAC M 0 Return 6 69 PDTimer Default setting 12 Parameter X 2 30 PACTOR Duplex BREAKIN time in seconds Defines the PACTOR Duplex BREAKIN time...

Page 82: ...remote control P command Enter the phase correction data from the reference station as a new initial value for the Phase command inverting the preceding factor i e 78 becomes 78 If a timeout occurs un...

Page 83: ...PSK output to be increased with the microphone gain control if available The transceiver should be connected either to a dummy load of appropriate power handling capacity or a well matched antenna Ple...

Page 84: ...QRT character which causes the system to go QRT close the link It can also be sent is the RX mode which then becomes active at the next TX phase In PSK31 RTTY FEC and UNPROTO it switches from transmi...

Page 85: ...l enabled This command permits the access to the remotablecontrol commands for a distant station With REMote 1 the remote commands are enabled The other station can now use all the commands signified...

Page 86: ...hilst connected allows the sysop to send a file to the other station All additional information concerning the file File header EOF text path text is suppressed so that for example station description...

Page 87: ...9 page 54 ESCchr It is also possible to force the PTC IIex to reset its SERBaud value to AUTO As the PTC IIex has no switches to let the user express the intention to reset to AUTO a special procedure...

Page 88: ...k the measured frequency deviation is additionally given SH could for example show the following Number of RECEIVED packets control blocks TRAFFIC 2 5 REQUEST 0 0 ERROR 0 0 MEMO ARQ 0 0 SLAVE RESPONSE...

Page 89: ...e or Traffic LED lighting depending on the received RTTY signal Coastal radio stations or other professional RTTY stations normally send the character string ZCZC in advance to a new message The end o...

Page 90: ...tus information can be implemented The status bytes incl header are sent in direct sequence During the transmission of status information new status requests are ignored The status information is proc...

Page 91: ...le 6 4 PTC status information Bit 4 6 In STBY condition the PTC IIex analyzes the HF channel and differs between busy and free A busy channel is defined as all signals that are audibly distinctly diff...

Page 92: ...g 0 Parameter 0 Simple terminal mode 1 Terminal mode with delayed echo 2 Split screen terminal mode 3 Enhanced split screen 4 Split screen with command prompt recognition 5 Split screen also for Packe...

Page 93: ...R data link status messages monitor information etc is always proceeded with a Ctrl F Only direct answer messages for a command input do not fall under this convention This allows the comfortable admi...

Page 94: ...channel Setchn as plain text information before the colon Channel numbers of two digits are thus output by two ASCII number characters The prompt information of terminal mode 5 cannot be split I e no...

Page 95: ...by the TNC command Using this command the PTC IIex up to the desired extend adapts its behaviour to react similar to the WA8DED command interpreter The PTC IIex reacts similar to a normal TNC if the T...

Page 96: ...s are used for FSK as well as PSK operation With PSK operation care must be taken that the difference between the two tones is exactly 200 Hz to remain compatible with the PT II standard There is noth...

Page 97: ...c 1 in RTTY and AMTOR With PACTOR the shift direction plays no part in the decoding as the correct relationship is always obtained at the start of the link 3 PACTOR III 1200 1400 Hz Call dial tones fo...

Page 98: ...ansmission mode for Unproto operation 1 5 Number of packet repetitions This command allows the transmission of broadcasts CQ calls etc in PACTOR without acknowledgment from the receiving station s An...

Page 99: ...n once a packet is correctly received it will not be received again A data packet may be repeated 3 times but will only appear once at the receiving station s It is recommended that the repetition rat...

Page 100: ...note that the next character s are figures 6 104 VERIfy This is identical to the RELOad command except the BBS file is NOT loaded into the PTC The checksum is calculated instead so as to check the fil...

Page 101: ...firmware up to now only for the PTC II without Robust PR 4 PR modem equipment 5A0A example 1 digit Modem type on port 1 0 no modem 1 external foreign modem e g DF9IC modem 2 RMNC KISS interface not su...

Page 102: ...ailbox operation The filename is the name of the subdirectory in which the message will be stored If this is missing then the PTC reacts with a message missing filename The message can additionally be...

Page 103: ...is possible Larger or equal 3 reading of all files is possible PR GATE priority Smaller 3 Access to the PR PACTOR gateway is denied Larger or equal 3 Free access to all gates is provided Detailed inf...

Page 104: ...llegal access to the PR Pactor gateway XUser CALLSIGN Deletes the callsign CALLSIGN from the user list The PTC IIex confirm that with OK The entry ALL cannot not be deleted XUser CALLSIGN xxxx Sets th...

Page 105: ...g 1400 Parameter X 300 2700 center frequency of the CW filter Sets the center frequency of the CW filter continuously between 300 and 2700 Hz Refer also to command CWfilter chapter 7 3 and the command...

Page 106: ...Notch Activates the automatic N times notch filter All systematic signals are heavily attenuated The algorithm used leads to considerably less signal distortion of speech signals compared to simpler...

Page 107: ...ne of 1000 Hz The command can also be used to setup a dual tone generator For this the second frequency is entered after the first one separated by a space Both tones are generated simultaneously whic...

Page 108: ...7 Audio 94...

Page 109: ...M FAX and SSTV The FM FSK modulator is phase continuous and highly linear producing an extremely clean transmitted signal The FM FSK demodulated signal is available as a 1 bit square wave at PIN 6 of...

Page 110: ...standardized at 400 Hz This means that in a normal FAX signal on shortwave the brightness information white is transmitted by a tone of 1900 400 Hz i e 2300 Hz and black is represented by 1900 400 Hz...

Page 111: ...imes has led to an unnecessary number of different SSTV sub standards some of which are poorly documented A real technical requirement for these multiplicity of standards is not to be found By limitin...

Page 112: ...ry Both problems are solved with the new modem command JVComm within the fax menu activating a new transmission routine On the receiving side the JVComm modem of the PTC IIex has the same behavior as...

Page 113: ...nd can be used to terminate a picture 254 Deletes the transmission data buffer and shortens the TX tail to 0 Analysis via data buffer This byte defines the regular end of a picture It must be added to...

Page 114: ...x can be ended at any time by inputting a byte with the value 255 dec via the RS 232 port It is essential to use the correct baud rate see MBaud command After the ending of Modem operation the PTC IIe...

Page 115: ...ator demodulator in this case such as BayCom or PCCOM The combination of PTC IIex and TFX emulates a real hostmode TNC for 300 baud Packet that can be operated with a hostmode terminal program such as...

Page 116: ...appropriately 1500 and 2300 Hz The maximum possible resolution and input filter bandwidth may be pre set using the SResolut parameter Unlike the FM FAX Modem values smaller than 0 measured frequency l...

Page 117: ...8 bit data width for picture information The practical results however speak against using this method With the JSynch parameter turned on default setting the recognized synchronization pulse is sign...

Page 118: ...goes to 10 Volts For frequencies lower than 1900 Hz the PTC IIex sets PIN 6 to 10 Volts The NFSK demodulator gives the measured frequency value to the RS 232 interface at a baud rate set by the MBaud...

Page 119: ...it is AM FAX FM FAX SSTV or FSK the PTC IIex keys the transmitter PTT becomes active when it receives bytes with a value between 0 and 63 The transmitter stays on for exactly 166 7 ms after receiving...

Page 120: ...parameter or other settings The maximum possible shift of the transmitted FSK signal however is thus limited to 800 Hz In order to generate the synchronization signal below 1500 Hz the PTC IIex must u...

Page 121: ...solution is as follows 0 1680 pixels sec 1 2500 pixels sec 2 3400 pixels sec 8 9 3 FResolut Default setting 2 Parameter 0 1000 Pixel sec 1 1500 Pixel sec 2 2000 Pixel sec 3 2800 Pixel sec Gives the ma...

Page 122: ...Hz i e frequencies from 1900 400 Hz to 1900 400 Hz 8 9 7 MBaud Default setting 57600 Parameter X 1200 115200 baudrate during modem operation Sets the baud rate used by the serial interface during MODE...

Page 123: ...arameter X 0 15 SSTV sub mode Sets the SSTV sub mode required The SMode parameter is only used for the SSTV line synch processing as it is only here that specific information about the various SSTV su...

Page 124: ...of the RS 232 interface When 10 volts appears the PTT line is activated The PTT line is de activated turned off when the voltage is 10 volts When in the send condition the PTC IIex measures the incom...

Page 125: ...and 1900 1250 Hz or 750 Hz and 3150 Hz The frequency band for FAX SSTV appears to be shifted about 400 to 500 Hz higher in frequency With normal SSB reception the higher FAX SSTV tones suffer great at...

Page 126: ...8 FAX 112...

Page 127: ...expression DAMA is added to the header of the monitored packets if the packet is received by a DAMA Digi The DAMA mode needs not be activated by the user The PTC IIex automatically notices if you are...

Page 128: ...o 1500 Hz On the receive side the same side band as the transmit side must be used We generally recommend USB With Robust PR modulation selected the PTC assumes that a connection will be via a HF Chan...

Page 129: ...ter frequency is calculated automaticly from the tone pair set with the TOnes MARk and SPAce commands in the cmd menu 100 Hz are added and subtracted respectively to generate the modem tones This may...

Page 130: ...pported by many KISS capable systems To switch into the SMACK mode first the normal KISS more needs to be entered KISS master and KISS modem then automatically negotiate if CRC protection SMACK can be...

Page 131: ...all sign is not set the APRS beacon cannot be activated The MYcall of the virtual channel 0 is automatically set to the Pactor MYcall after a RESTart so that normally only a single MYcall entry is nec...

Page 132: ...N YYYYY YYW E Allows the entry of the position for the FIX operation Aprs 2 see 9 6 1 The position must be entered exactly in the correct format for Latitude Longitude which means degrees including le...

Page 133: ...r Home HF If no symbol number is given as an argument the A SY command normal way displays the actual parameter settings however with a current symbol additionally with a short description in square b...

Page 134: ...d data from the GPS receiver to 1800 seconds 9 6 2 Baud Default setting 1200 Parameter X Baud rate for the radio link Setting checking the radio link baudrate Without a parameter the Baud command show...

Page 135: ...ter 6 11 page 42 9 6 6 Connect Default setting none Parameter target call Digi1 Digi2 Connect sets up the AX 25 link Connect to DL1ZAM pac C DL1ZAM Return If the link takes place via one or more digip...

Page 136: ...ect DL1ZAM 8 PTC Mailbox The Command interpreter buffer is 256 characters long Commands plus CTEXT argument should not contain more characters otherwise the CTEXT will be truncated 9 6 11 DIGIpeat Def...

Page 137: ...h to the hostmode independently 9 6 16 KISS The KISS Mode is activated with the commands KISS or alternatively K out of the normal command mode This usually happens automatically by the KISS PC softwa...

Page 138: ...given in decimal or hexadecimal prefixed with a character ASCII values Only works in PR terminal mode and can only be accessed in that mode Does not operate in hostmode Filters received and transmit...

Page 139: ...lp The MText input is done via the normal command interpreter so a convention for the CR character has to be used The CR is represented within the MText string by This would be input like pac MT Welco...

Page 140: ...CALL and overwrite the SCSPTC with the valid mycall If the MYcall command is executed on the PACTOR side with a valid callsign as an argument the PTC IIex also checks all PR channels for SCSPTC and if...

Page 141: ...eans that only data addressed to the PTC MYCALL will be accepted by the mailbox This is a legal requirement in many countries as an open BBS may only be operated by especially licensed stations The fu...

Page 142: ...tting 100 Parameter X 1 30 000 slot time in milliseconds Sets the slot time for the transmitter control The PTC IIex can transmit at particular times only SLottime defines the period between these tim...

Page 143: ...o Default setting CQ Parameter Call Callsign for Unproto Unproto sets the target callsign for the Unproto operation To start an Unproto transmission just enter the Converse mode with K and everything...

Page 144: ...tial users would use the normal MYCALL to connect to the PTC IIex If the terminal is off line and the configuration is correct USers 0 or Y0 then all calls irrespective of if they are the normal MYCAL...

Page 145: ...rove it Especially for new ideas like extended hostmode and AX 25 protocol expansions like as DAMA TheFirmware was and is the basis for development Because of these advantages the wide distribution of...

Page 146: ...ability of a Packet Radio connection depends on the time parameters Because of this check the initialization files of programs you use in advance and very carefully Often the added examples are design...

Page 147: ...rminal mode and the hostmode Terminal Mode Hostmode Terminal Mode Hostmode Baud B MCon M CHeck T3 Monitor M CMsg U MStamp K Connect C MYcall I CONStamp K PErsist P CText U RESptime T2 Disconnect D REt...

Page 148: ...the PTC IIex then queries whether the information has arrived 10 4 4 G G Get is a special Hostmode command and is used to get information about the various Hostmode channels This command is only used...

Page 149: ...rameter N Monitor switched off I Info frames U Unproto transmissions S Control packets C Monitor also while connected M sets which frame types will be displayed in the monitor 10 4 10 N Default settin...

Page 150: ...tion command in the cmd menu the output always has NMEA format The NMEA compatible string usually looks like GPGGA 192552 5005 430 N 00845 983 E 1 03 2 7 106 3 M 47 8 M 4F 10 4 15 PT Switches the PTC...

Page 151: ...ers Limits the number of channels available for remote users Y 5 limits the number of connects from outside to five so if the PTC is presently connected to by 5 stations and a further station attempts...

Page 152: ...16 If hostmode fax reception is activated 8 bit per sample grey scale FAX data is available on hostmode channel 252 The data field length of the hostmode packets on channel 252 is always 256 The sampl...

Page 153: ...e byte sequence is usually done automatically by the software as well and may just once be configured correctly in the setup of the program 10 4 24 S If hostmode FAX reception refer to 10 4 22 Page 13...

Page 154: ...tuning display is activated refer to 9 4on page 115 For 9600 and 19200 baud operation a suitable transceiver is necessary 10 4 28 C This is identical to the CLR command in the main menu of the termin...

Page 155: ...stmode and is used to define a special extension of the PTC IIex Terminal programs which wish to work with delayed echo in hostmode must logically be appropriately extended to contain this feature and...

Page 156: ...frequency change is prohibited due to a special actual state of the modem e g when the modem has already detected the beginning of a user access on the PACTOR HF port In principle this problem can alr...

Page 157: ...led extended hostmode The extended WA8DED Hostmode has established itself as a de facto standard for communication between TNC PTC and PC control programs The extended hostmode makes the polling of th...

Page 158: ...tes are sent back to the PTC as a response to the G poll The number of bytes calculates as paramater value plus 1 Thus the command G0 is compatible with the usual G poll without argument because it yi...

Page 159: ...has two basic weak points which can cause serious problems with data corruption or loss during operation 1 There is no reasonable possibility for a resynchronization of the Hostmode operation if throu...

Page 160: ...esent on the RS 232 interface The character means Binary byte The protocol is based on the extended Hostmode A number of data packets are built up according to this sub protocol The HOST PC is as in W...

Page 161: ...ses the possibility to quickly inform the Master that the last transmitted packet should be repeated by inserting a short request packet The request packet has the format 170 170 170 85 10 8 3 MASTER...

Page 162: ...waiting for the MASTER timeout NACK condition Reaction of the SLAVE to the ACK condition Transmission of the present new response packet e g data packet if a G POLL NOTE This packet must be buffered i...

Page 163: ...m start should have bit 6 set to ensure that a correctly received packet at the SLAVE always leads to an ACK condition This allows the MASTER to start the protocol without having to know the condition...

Page 164: ...x FOR j 0 TO 7 DO BEGIN IF Odd Data XOR accu THEN accu accu shr 1 XOR 8408 ELSE accu accu shr 1 Data Data shr 1 END crc_table index accu END Build table END Begin InitCRC Expand CRC Table crc ffff Sta...

Page 165: ...HIGHBYTE 153 When checking the CRC reception one also calculates both the transferred CRC bytes into the CRC value The new CRC value so obtained must equal F0B8 if the block has arrived correctly Alte...

Page 166: ...parameters are not required and will be ignored if given After turning on the PSK31 terminal the PTC IIex is in the receive condition Various PSK31 relevant settings are at their default or previousl...

Page 167: ...mpt in terminal mode 5 TERM command has the code cmd 5 or binary 00100101 In the status byte refer to Status command chapter 6 91 page 75 the PTC displays RTTY CW as there are no further free codes av...

Page 168: ...inverted DQPSK If a DQPSK variant is chosen the PTC IIex signals this with the DQPSK LED Inverted DQPSK is needed when lower sideband is used on an SSB transceiver as here the signal phasors revolve...

Page 169: ...LED s 1 and 15 flicker The fine tuning can also be carried out with the hot keys Ctrl K and Ctrl L if the VFO does not have a fine enough resolution At first sight the tuning procedure sounds relative...

Page 170: ...ld show the PTC IIex RAM expansion cmd SYS Ram Return The sys menu commands in detail 12 1 Audio Serves to carry out a so called Audio loop test or check of the analogue I O stages as well as the DSP...

Page 171: ...SK test routine Return toggles between Mark and Space tones The routine supports the FSK as well as the AFSK outputs The PTT transistor switch is turned on during the FSK test routine The FSK test may...

Page 172: ...ng bar high tones at the right side If more than 15 tones are used on a speedlevel SL 5 and 6 some tones in the center of the spectrum are omitted With the aid of the tone monitor one can for example...

Page 173: ...12 SYStest 159...

Page 174: ...ring a normal firmware update one part of the FLASH is programmed with the new version while the other still contains a part of the old firmware It is very unlikely that such a mixture will run and th...

Page 175: ...hing the unit OFF again This can also be done with the OFF command of the BIOS refer to 13 3 5 on page 162 At next power on it will start the firmware again Some experience may be necessary to hit the...

Page 176: ...of the flash selcall By using the FSelcall command it is possible to store your own selcall permanently in FLASH ROM Stores the flash selcall DFCJ cmd FS DFCJ Return Checking the flash selcall cmd FS...

Page 177: ...and cmd SERB auto Return Switching on the PTC IIex the next time the automatic baud rate recognition will work Without entering arguments the SERBaud command shows the actual baud rate The message aut...

Page 178: ...component cmd TI 09 56 05 Return or cmd TI 095605 Return 13 3 10 UPDATE Identical to the UPDATE command in the PACTOR firmware This command renews the PACTOR firmware in the Flash ROM of the PTC IIex...

Page 179: ...o possible to obtain further help on a command whilst in BIOS with Help CMD More details to the RUN command sys Help RUN Return 13 4 6 Led Checks the LED s The PTC IIex tests the whole lighting consol...

Page 180: ...eed to be changed After switching on the PTC IIex the operation software is expanded from the 8 bit flash loaded in the 32 bit static RAM boot and started The operation software uses the 32 bit data b...

Page 181: ...00 Hz is allowed The complex modulation scheme often used but very difficult to handle because an adjustment to only a few Hertz was necessary is gone 14 3 The Power supply The PTC IIex contains two p...

Page 182: ...On the back is the DC input an ON OFF switch an 8 pin DIN socket for the transceiver conection as well as a 9 pin SUB D socket for the terminal connector The construction is largely SMD Every single...

Page 183: ...14 Circuit Description 169...

Page 184: ...at and the short packet lengths of AMTOR have been retained These result in a protocol much more resistant to interference than Packet Radio under poor propagation conditions The PACTOR protocol toget...

Page 185: ...rdware and which can be classed as state of the art The main question was what could be improved in PACTOR I A bit of head scratching provided the answer First of all a significant improvement has to...

Page 186: ...rporated 15 3 Basics of the PACTOR II protocol 15 3 1 General The PACTOR II protocol PT II is essentially based on the Level I standard consisting of a synchronous half duplex ARQ protocol New however...

Page 187: ...ximum step speed which finally led to his sampling theory Stemming from his work a special step or impulse waveform was found that contained the ideal characteristics for data transmission over an ele...

Page 188: ...anges between the steps it s called differential binary phase shift keying DBPSK Every step contains exactly one bit of information If four different phase changes are allowed then the modulation is c...

Page 189: ...tion AM etc it is NEVER allowed to overdrive the transmitter because intermodulation products will be generated broaden the signal How to adjust the maximum transmitter power will be described in the...

Page 190: ...e code is called a Viterbi decoder Unfortunately there is an exponential relation ship between constraint length and the computing time required by a Viterbi decoder This is why the use of the Viterbi...

Page 191: ...makes use of the statistical frequency distribution of characters in plain language text The characters most used e g e and n are coded with only two or three bits Rare characters such as Y can conver...

Page 192: ...tuned to say 3583 7 kHz or 14079 0 kHz and DL2FAK called providing the frequency is clear If there is PT traffic on the chosen frequency irrespective whether PT I or PT II the PTC IIex will automatic...

Page 193: ...OR I PACTOR II achieves an effective text throughput of around 3 times that of PACTOR I under average to poor conditions With very weak signals or signals with heavy interference PACTOR II still works...

Page 194: ...ts As with PACTOR I a CQ call or broadcast is normally carried out with 100 Bd FSK UNPROTO mode see the Unproto command refer to chapter 6 100 page 84 Such transmissions can be read by all PACTOR user...

Page 195: ...15 Basics 181...

Page 196: ...e production of the Z80 STI peripherial chip used in the Z80 PTC ended This was then the opportunity to develop the PTCplus Based on an MC68000 processor the PTCplus is the springboard to a totally ne...

Page 197: ...ACTOR III is the ideal means of fast and reliable data communication over the sometimes difficult medium HF radio The new protocol is fully backwards compatible to existing PACTOR I II networks In sum...

Page 198: ...or M706 IC 718 Order No 8110 YAESU Audio cable PTC 5 pin DIN to YAESU FT 817 6 pin Mini DIN e g for FT 100 FT 817 FT 897 Also usable for 1k2 Packet Radio Order No 8120 KENWOOD Audio cable PTC 8 pin DI...

Page 199: ...ies 185 Cable with 5 pin DIN connector Order No 8010 Cable with 8 pin DIN connector Order No 8020 For more accessories and prices please refer to our homapage http www scs ptc com or call for a recent...

Page 200: ...sh FLASH ROM for easy updates RAM 2 MByte CMOS static Battery Backup Real time clock With battery back up date weekday hrs mins secs System monitoring With an internal processor watchdog Battery 3 V h...

Page 201: ...B Technical Data 187...

Page 202: ...C Layout Appendix C 19 Layout B 1 Motherboard Figure B 1 Motherboard 188...

Page 203: ...C Layout 189...

Page 204: ...1 The Power Supply V1 LL4004 SI1 500mA L1 47uH L2 47uH X1 DC IN C31 100n V2 LL4004 C10 100n R21 150 C29 100u C30 100n V27 5V1 GND C65 2 2u GND GND 5V P GND GND R71 150 C28 100u GND C68 100n C9 100n GN...

Page 205: ...2 3 2 1 8 4 U24A TLC272 R74 47K R75 47K R61 47K R78 47K GND GND C22 100u C62 100n C80 100p R62 22K C81 100p L22 C61 1n L21 L28 C64 1n L27 GND GND GND GND GND GND R42 1K R41 10K GND L26 C63 1n L25 GND...

Page 206: ...R1I 4 R2I 23 R3I 16 T1I 7 T2I 6 T3I 18 T4I 19 T5I 21 R1O 5 R2O 22 R3O 17 V 11 C1 10 C2 13 V 15 C1 12 C2 14 MAX207 U12 C5 100n L4 L5 C33 1n GND L6 L7 C34 1n GND L8 L9 C55 1n GND L10 L11 C56 1n GND L12...

Page 207: ...Cable 5 9 4 8 3 7 2 6 1 X1 SUB D 9 PIN Molded screws UNC4 40 5 9 4 8 3 7 2 6 1 X2 SUB D 9 SOCKET female screw locks 5 9 4 8 3 7 2 6 1 X3 SUB D 9 PIN female screw locks PTC II e PC GPS Figure C 4 The...

Page 208: ...computer Pin 3 RxD Receive data input from computer Pin 4 DTR Input RxD secondary serial port Pin 5 Ground GND Pin 6 DSR Output Pin 7 CTS Input Pin 8 RTS Output Pin 9 RI Output TxD secondary serial po...

Page 209: ...E Connector Pin out D 4 Cable Color Code 8 pol DIN PIN Color PIN Color 1 Violet 5 Blue 2 White 6 Red 3 Yellow 7 Black 4 Green 8 Brown Table D 1 Cable Colors 8 pole DIN cable 196...

Page 210: ...gain ASCII American Standard Code of Information Interchange 7 bit code for numbers characters special characters and control characters Backup Another word for safety copies which should be done regu...

Page 211: ...ecause of this the receiver has the possibility to notice and correct transmission errors without transmitting the information again FIR Finite impulse response Digital filter with finite impulse resp...

Page 212: ...C IIex indicates e g the readiness with cmd TNCs using TheFirmware will display only an asterisk as a prompt Using DOS for example the prompt looks like C DOS PSK Phase Shift Keying RAM Random Access...

Page 213: ...interface a screen and a keyboard All signals received by the serial interface are displayed on the screen All inputs made at the keyboard are transmitted via the serial interface TTL Transceiver Tran...

Page 214: ...k In January February 1992 9 ROY PHILPOT DJ0OW PACTOR Here and Now Amateur Radio 12 1992 10 C RICHARDS 9M2CR PACTOR The Magic Successor to RTTY and AMTOR Amateur Radio 3 1993 11 ROY PHILPOT DJ0OW PACT...

Page 215: ...Index 202...

Page 216: ...92 158 AUdio 40 Audio functions 35 Audio output level 14 55 69 AUDPerm 158 Auto status in Hostmode 146 B BAKup 40 Bandwidth 92 Baud 122 BAUdot 41 Baudrate 73 165 BC 42 Beep 159 166 Bell 44 BEll 42 BIO...

Page 217: ...145 F F 136 Fax menu command 101 FAX 54 140 AM FAX 96 102 Comparator 105 FM FAX 97 103 FSK 105 General information 96 LED functions 100 112 Tuning display 112 TX in AM FAX Mode 107 TX in Comparator Mo...

Page 218: ...t text 47 Directory 52 Enabling for Packet 129 Listing 57 Mail announcement 60 Multiple file operations 24 Packet Radio 25 Packet Radio connect message 123 Passing PR connects to 26 Read command 70 Re...

Page 219: ...and Status 155 Actication 154 Carrier frequencies 154 General 154 How to start 70 Receiver Tuning 157 CW Identification 157 PSKAmpl 69 PSKTerm 70 PT 70 PTChn 70 PTC II construction 170 Ptt 160 Q Qrt 7...

Page 220: ...or 94 TOnes 83 TR 84 TRACE 130 Transmission at Modem operation 106 Tuning indicator and behavior 180 TXcomp 111 TXdelay 131 TXDelay 85 TXLevel 131 Typography 2 U U 138 UMlauts 85 Unproto 85 131 Unprot...

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