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CWR6850

TELEREADER

INSTRUCTION

MANUAL

QUALITY COMMUNICATIONS EQUIPMENT

April, 1982 Printing

Summary of Contents for CWR6850

Page 1: ...CWR6850 TELEREADER INSTRUCTION MANUAL QUALITY COMMUNICATIONS EQUIPMENT April 1982 Printing...

Page 2: ...iderations when transmitting Baudot 28 4 6 Special considerations when transmitting ASCII 30 4 7 HDX FDX operation 33 4 8 The KOS feature 34 CHAPTER 5 CONNECTIONS TO THE CWR6850 35 5 1 Normal Amateur...

Page 3: ...circuit connections 36 Figure 6 Typical Video Detector 41 Figure 7 Modified Video Detector 41 Figure 8 RFI Reduction techniques 42 Figure 9 PFI Power line filters 44 Figure 10 Test points and user ad...

Page 4: ...may not understand until you have read this manual You should plan to devote several hours to becoming familiar with your CWR6850 However there are many hobbyists including the writer who are eager t...

Page 5: ...rding the packing materials check that all parts and accessories are accounted for Check the accessories against the following list If any are found missing double check the packing for loose parts an...

Page 6: ...CHAPTER 2 PAGE 6...

Page 7: ...ed audio cable between the transmitter microphone audio input and the CWR6850 AFSK OUT TX connector Check your transmitter manual some trans mitters have 12 VDC on the mike input lead to run remote co...

Page 8: ...mum clockwise rotation BRIGHT rear panel Maximum clockwise rotation After the cathode ray tube CRT has warmed up you should see the following features on the screen 1 Top portion of the screen blank e...

Page 9: ...s Preset your transceiver controls as follows FREQUENCY 14 075 to 14 100 MHz ANTENNA Antenna for above frequency range MODE LSB lower sideband PASSBAND TUNING LSB RECEIVER AGC ON SLOW RCVR SELECTIVITY...

Page 10: ...2 5 Morse Operation To use the CWR6850 for Morse code reception change the CW RTTY button to CW button out Leave the transceiver mode in LSB for the present and tune to a Morse code signal When the re...

Page 11: ...e for RTTY using the SEND or AUTO switch positions and CTRL A or CTRL X commands to turn the transmitted data on or off The CTRL D command may also be used when transmitting Morse code to give 25 exte...

Page 12: ...if the receiver s internal speaker is disconnected when you connect the CWR6850 The left hand vertical slide control INPUT on the front panel controls this monitor volume level If you wish an external...

Page 13: ...n ON POWER ON lever up FSK DEMOD rear panel INT AFSK GAIN rear panel Maximum clockwise rotation BRIGHT rear panel Maximum clockwise rotation After the cathode ray tube CRT has warmed up you should see...

Page 14: ...quency and notice that as the beat note frequency changes the MARK and SPACE LEDs will alternately turn on as you tune through their filters You will need to tune slowly and carefully since the mark a...

Page 15: ...extensively in most other countries of the world When receiving or transmitting on the HF bands 3 30 MHz either set of tones will work since you tune the receiver to produce the desired beat note fre...

Page 16: ...0 Hz shift stations Disadvantages 1 Low tones are not compatible with existing U S VHF AFSK operations Since there is a great deal of high tone AFSK equipment already in use in the United States and n...

Page 17: ...CW signal may be considerably more difficult when the PLL filter is used The PLL filter does however offer a considerable improvement in received S N signal to noise dis crimination and will track th...

Page 18: ...l for HF and audio tone for VHF AFSK for either mark or space RTTY data conditions there is a definite signal transmitted On Morse code the transmitter carrier is turned on when the key is down mark b...

Page 19: ...of these special combinations will be explained more fully in later sections of this manual In general use the keyboard as you would a typewriter making use of the SHIFT key when re quired For example...

Page 20: ...recorder or with TTL data connections computer some machine and modems Use these I O connections is discussed in Chapter 5 To demonstrate use of the transmit features we will use the CW Morse code mod...

Page 21: ...t re adjust the VOLUME slide control if neces sary The CW transmit speed is adjusted with the SPEED slide control Notice that as all of the pretyped characters are transmitted the characters in the tr...

Page 22: ...r adjust volume with the VOLUME slide control Leave word mode turned off for now CTRL Y no Y character on the status line The first of these techniques involves the CTRL X key command indicated by X o...

Page 23: ...ON BS Back Space back up cursor one space and remove the cha racter from that space CTRL Z BS Delete the final line of data in the transmitting buffer area CTRL A SHIFT Delete all text in the transmit...

Page 24: ...witch back to RTTY for the final CR CR LF sequence The CWID A CWID B front panel switch makes a difference here in CWID B position the CW ID is transmitted using mark space AFSK in CWID A position the...

Page 25: ...ape into the CWR6850 listen to tones using INPUT slide control to adjust the vol ume 6 The reverse video L will go out and the tone frequency will be constant when the loading is complete 7 Select pag...

Page 26: ...justs to variations in the speed of the received signal to change the Morse transmit speed use the slide SPEED control up for faster speeds and down for slower speeds Select CWID A button out for CW t...

Page 27: ...r negative voltage keying circuit Most older tube type transmitter circuits used grid block or negative voltage circuits most solid state transmitters use a positive voltage key circuit Either polarit...

Page 28: ...dot coded are used twice Case shift characters are sent to the printer to signal whether a following character will be a letter case LTRS or number punctuation FIGS When us ing a manual Baudot RTTY ma...

Page 29: ...0 0 1 0 0 1 0 1 0 1 0 0 1 0 1 1 0 1 1 0 0 0 1 1 0 1 0 1 1 1 0 0 1 1 1 1 1 0 0 0 0 1 0 0 0 1 1 0 0 1 0 1 0 0 1 1 1 0 1 0 0 1 0 1 0 1 1 0 1 1 0 1 0 1 1 1 1 1 0 0 0 1 1 0 0 1 1 1 0 1 0 1 1 0 1 1 1 1 1 0...

Page 30: ...ceive frequency matching These same tones may also be used to record and play back messages with an audio tape record er as explained in Section 5 4 Simultaneous with the selected transmit tone output...

Page 31: ...ns common on these frequency bands Also the ASCII code offers a considerably larger character set than the Baudot code normally used at these slow rates The CWR6850 will transmit and receive a full AS...

Page 32: ...ACK ESC CTRL G BEL BS ESC CTRL X CAN RETURN ESC CTRL P DLE ESC CTRL RUB OUT ESC CTRL Q ESC CTRL R ESC CTRL S ESC CTRL T ESC CTRL Y ESC CTRL E ENQ ESC CTRL D EOT ESC ESC ESC CTRL W ETB ESC CTRL C ETX...

Page 33: ...in 110 0 10 0 9 09 DLE data link escape SO shift out 300 0 30 0 3 33 EM end of medium SOH start of heading EOT end of trans SIX start of text ESC escape SUB substitute ETB end of block SIN synchronou...

Page 34: ...8 The KOS Feature The KOS Keyboard Operated Switch feature of the CWR6850 allows automatic control of the transmit receive circuits of the station in much the same manner as the SSB VOX circuit Select...

Page 35: ...CHAPTER 5 PAGE 35 Figure 4 Connections To The CWR6850...

Page 36: ...and the CWR6850 AFSK OUT TX connector A stereo phono cable can be used for this and the KOS connection described next Note that the phono connector s will probably need to be cut off on the trans mit...

Page 37: ...olts Notice that the voltage levels of the TTL standard are NOT compatible with those of RS232 data connections Do not be misled by some claims of direct TTL RS232 compatibility damage may be caused t...

Page 38: ...he printer connection are Connector HIROSE P 1612 BAC 12 pin plug HAL 332 12000 Wire 12 Conductor cable shielding recommended 5 ft PIN USE PIN USE 1 2 3 4 5 6 GND BUSY NOT RDY NOT ACK D8 MSB D7 D6 7 8...

Page 39: ...When the taped message stops type CTRL E again to end the echo back feature The connection of the tape recorder to the CWR6850 is shown in Figure 5 Use shielded cables for these connections include RF...

Page 40: ...e CWR6850 dis play along the corners and edges it may be necessary to shrink the size of the TV raster with the width and height controls These adjustments will be made after the TV set is modified an...

Page 41: ...CHAPTER 5 PAGE 41 Figure 6 Typical Video Detector Figure 7 Modified Video Detector...

Page 42: ...on is more than a quar ter wavelength at the highest operating frequency make the ground wire an integral number of half wavelengths long If you plan to operate 10 and 15 meters you may need to run se...

Page 43: ...he CWR6850 Test the operation while it is connected only to AC power At the same time enable the transmitter so that it sends a CW signal into a dummy load If RF problems are still present then RF ene...

Page 44: ...0 meters that are center fed with only coaxial cable A balun at the antenna tends to reduce this problem Also dress the coaxial cable from the balun so that it drops perpendicular to the dipole rather...

Page 45: ...orp to be in compliance with Part 15 Subpart J of the FCC Rules And Regulations Class B computing device The following text is a requirement of that regulation This equipment generates and uses radio...

Page 46: ...ply with the limits for a Class B com puting device pursuant to Subpart J of Part 15 of FCC Rules Only peripherals computer input output devices terminals printers etc certified to comply with the Cla...

Page 47: ...ition the terminal so that its ventilating holes are not obstructed and try to avoid ex tremely dusty or dirty environments On the other hand the solid state components in the CWR6850 are designed to...

Page 48: ...of the circuitry has failed you may well get such symptoms However most often when a new owner finds the terminal unresponsive it is actually doing what it has been instructed to do Familiarity with...

Page 49: ...wn in Chapter 7 Often a confusing state may have been caused by accidental typing of a control command Above all be careful when using the CTRL L RETURN key sequence If invoked the CWR6850 is expect i...

Page 50: ...X 365 URBANA ILLINOIS 61801 ATTENTION REPAIR DEPARTMENT The one year limited warranty listed in full at the end of this manual provides for repair of the CWR6850 for a full year after purchase The pur...

Page 51: ...of the two circuit boards It is NOT neces sary to remove any circuit boards to make these adjustments You will however have to remove both the top and bottom covers of the CWR6850 Be careful to avoid...

Page 52: ...t set VR 2 for 800 Hz at TP 2 Adjust minimum CW transmit speed Set SPEED slide control to minimum 0 and adjust VR 3 for CW transmit speed desired Measured at TP 3 Adjust maximum CW transmit speed Set...

Page 53: ...clearly marked on the circuit board and you may adjust them if re quired The available controls are MARKING LOCATION FUNCTION V LIN V HEIGHT V HOLD VIDEO CENTER SUB BRIGHT FOCUS Right side Right side...

Page 54: ...nter regardless of code KOS SWITCH NPN transistor switch to ground to control TX RX function SW OUT of station SW OUT REMOTE REMOTE Voltage 50 VDC maximum Current 200 mA maximum Isolation relay or cir...

Page 55: ...t NORM REV switch changes polarity of RX tones on ly DISPLAY SCREEN 5 inch diagonal measure 3 25 4 26 green CRT 20 lines of 32 charac ters per line four pages may be selected for viewing PAGE 56 lines...

Page 56: ...eceive continuously PUSH RESET ON Erase receive screen return cursor to initial receive position BUTTON display 1st display page Clear printer output register and SWITCHES erase memory transmission bu...

Page 57: ...UT REMOTE SW OUT FSK SW OUT CW OSCILLO SPACE OSCILLO MARK AFSK OUT TX AFSK OUT TAPE AF IN TAPE AF IN RX FUSE DC 13 8 V REAR PANEL FSK DEMOD INT Internal FSK demodulator used for reception of RTTY CONT...

Page 58: ...se video star in receive buffer Load start command to load contents of all six HERE IS memories from tape control passes to tape and CWR6850 will not respond to further keyboard commands until after a...

Page 59: ...UB OUT key Cancel W command Turn on transmitter and transmit data works when SEND AUTO RECEIVE switch is in AUTO transmitter stays on until second CTRL X is used to turn transmitter off ON OFF control...

Page 60: ...APPENDIX B PAGE 60 APPENDIX B CWR6850 DISPLAY FORMAT TOTAL DISPLAY CAPABILITY...

Page 61: ...APPENDIX B PAGE 61 PAGE 0 and PAGE 1 DISPLAY FORMAT...

Page 62: ...APPENDIX B PAGE 62 PAGE 2 and PAGE 3 DISPLAY FORMAT...

Page 63: ...display will return to the new default page when CTRL Q 5 is used 5 The following precautions apply when using the CWR6850 with the ICOM brand of HF trans ceivers IC710 720 720A 730 a When using SW OU...

Page 64: ...manufacturer s brands of transceivers with the possible exception of the choice of audio output connection to the transceiver ALWAYS use a low impedance audio output such as the external speaker conn...

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