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Содержание 886 EBS System

Страница 1: ...www SteamPoweredRadio Com 1 1 1 I I I I I I I I I I I I I I I I OPERATION MANUAL MODEL 886 AM EBS SYSTEM MODEL 887 FM EBS SYSTEM ...

Страница 2: ...sion B September 7 1990 Equipment Serial No _ __ Shipment Date_ _ _ __ OPERATION MANUAL MODEL 8 86 AM EBS SYSTEM MODEL 887 FM EBS SYSTEM TFT Inc 3D90 Oak mead Village Drive P O Box 58088 Santa Clara CA 95052 8088 TEL 408 727 7272 FAX 408 727 5942 ...

Страница 3: ...www SteamPoweredRadio Com ...

Страница 4: ...s antenna is also available through Edmund Scientific 101 E Gloucester Pike Barrington NJ 08007 1380 609 573 6250 Trade Name Super Select a tenna Part No 72147 If higher RF signal level to the Model 886 is required an outdoor antenna can be used See the diagram below for installation and connections 3 F T OR HIGHER SENSITIVITY CAN BE INCREASa BY USING A LONG w lRE ANTENNA CONNECTED IN THE Fll l Dw...

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Страница 6: ...www SteamPoweredRadio Com FM IN DOOR ANTENN A TFT MODEL 887 300TO 75OHM MATCHI NG TRANSF ORMER AG 2 3 1 FM ANTEt NA MATCH NG iNsTAI LATKlN DIA A M 6600 2 671 REV A ...

Страница 7: ... Ac power is applied through the rear panel ac connector Connect the line cord to an appropriate outlet The 887 should now be on 2 6 AM Antenna Installation If a local AM antenna is not available an end fed long wire antenna approximately 250 ft can be used One end of the long wire should be connected to the ANT 75Q connec tor For moderately strong signal areas an alternative to the long wire ante...

Страница 8: ...m Installation 2 4 AM Antenna Installation 2 5 886 887 Wiring Diagram AM Antenna Installation Diagram OPERATION 6600 2608 6600 2601 General Discussion 3 1 Turn on and Warm up 3 1 Controls Connectors and Indicators 3 2 System Operation 3 8 3 4 1 Operation of the AM Receiver 3 8 3 4 2 Operation of the FM Receiver 3 9 3 4 3 Operation of the Two tone Generator AM and FM 3 9 Model 886 Front and Rear Vi...

Страница 9: ...5 3 Dual tone Level Adjust AM and FM 5 3 Calendar Display Adjust AM and FM 5 4 Receiver Audio Output Adjust 5 4 5 6 1 AM Receiver Audio Output Adjust 5 4 5 6 2 FM Receiver Audio Output Adjust 5 5 Receiver Audio Signal versus Dual tone Signal AM and FM 5 5 DIAGRAMS AND SCHEMATICS Title EBS Block Diagram Main Board Schematic Main Board PCB Assy Display Board Schematic Display Board PCB Assy AM Recei...

Страница 10: ...wing pickup and rebroadcast of emergency programming without degradation of signal quality Both EBS Systems have a built in two tone decoder for the 853 Hz and 960 Hz EBS signaling tones from demodulated outputs Stable piezoelectric tuning fork filters are used to achieve a bandwidth of 5 Hz from each tone frequency This integral two tone EBS generator which uses individual crystal oscillators pro...

Страница 11: ...V for 20 dB signal to noise at 30 modulation Image Rejection 25 dB AGC 60 dB IF Bandwidth 6 dB 5 kHz Harmonic Distortion Less than 3 at 75 modulation Noise 45 dB or greater below 75 modulation with 10 mV meter RF signal level Audio Outputs 6000 Balanced 8 dBm Unbalanced 1 Vrms Carrier off Output Active pull up to 10 V 10 mA FM Receiver Frequency Range 88 MHz to 108 MHz Tuning Method Pushbutton ste...

Страница 12: ...Signal to noise Ratio SNR 60 dB or greater below 100 modulation at 50 1 iV RF input De emphasis 75 sec Audio Outputs 6000 Balanced 8 dBm Unbalanced 1 Vrms Carrier off Output Active pull up to 10 V 10 mA Decoder AM and FM Decoder Input Level 100 mV into 6000 Bandwidth t 5 Hz Frequency Stability 0 25 Hz crystal controlled Audio Output Level 250 mW internal speaker Generator Output Level 6000 Balance...

Страница 13: ...e switch In the ON mode the speaker is demuted In the STANDBY mode the speaker is muted until an EBS alert is received RESET Switch Resets mutes the speaker after receipt of BBS transmission TEST RESET Switch 3 position spring loaded toggle switch In the TEST position the 886 887 performs a self test of the decoder In the RESET position it interrupts on air transmission or a self test ON AIR Switc...

Страница 14: ...tory with transportation charges prepaid by the BUYER It is expressly agreed that replacement and repair shall be the sole remedy of BUYER with respect to any non con forming equipment and parts thereof and shall be in lieu of any other remedy available by applicable law All returns to the factory must be authorized by the SELLER prior to such returns Upon examination by the factory if any instrum...

Страница 15: ...y way or fails to operate properly due to transportation damage file a claim with the carrier or if insured separately with the insurance company WE SINCERELY PLEDGE OUR IMMEDIATE AND FULLEST COOPERATION TO ALL USERS OF OUR PRECISION ELECTRONIC INSTRUMENTS PLEASE ADVISE US IF WE CAN ASSIST YOU IN ANY MANNER TFT Inc 3090 Oakmead Village Drive P O Box 58088 Santa Clara CA 95052 8088 408 727 7272 TWX...

Страница 16: ...h the insurance company 2 2 Power Requirements Both AM and FM EBS Systems are factory wired to operate from 117 Vac The line frequency must be either 50 Hz or 60 Hz To select either 50 Hz or 60 Hz jumpers supplied must be placed at the appropriate pins at both Pl and P2 on the Main Board For 50 Hz pins 3 and 4 must be jumpered for 60 Hz pins 1 and 2 must be jumpered Refer to the exploded view of P...

Страница 17: ...ange these DIP switches for other than the times set at the factory perform the following a Remove the EBS top cover b To change the dual tone duration depress the switch position on SW9 for the desired time according to the following list The remaining switch posi tions should be in the OPEN position Position 2 6 seconds Position 3 12 seconds Position 4 24 seconds Position 1 Unused and should be ...

Страница 18: ...nitor or other external device The output at these terminals is 8 dBm into 600Q e If a remote indication of carrier failure is to be provided connect the CAR RIER FAIL terminals pins 7 ground and 8 of Jl on the rear panel of the 886 to the remote indicator The output 10 Vat 10 mA for carrier loss f Connect the program output to the AUDIO LOOP THRU RIGHT CH BALANCED INPUT terminals pins 4 and 5 of ...

Страница 19: ...d and 8 of Jl on the rear panel of the 887 to the remote indicator The output is 10 Vat 10 mA for carrier loss f To connect the right channel loop thru configuration connect the program right channel balanced output to the AUDIO LOOP TIIRU RIGHT CH BALANCED INPUT terminals pins 4 and 5 of J2 on the 887 rear panel Connect the stereo generator right channel input line to the AUDIO LOOP THRU RIGHT CH...

Страница 20: ...of J1 on the 887 rear panel See Figure 2 1 Model 886 887 Wiring Diagram at the back of this section for relay configuration J Ac power is applied through the rear panel ac connector Connect the line cord to an appropriate outlet The 887 should now be on 2 6 AM Antenna Installation If a local AM antenna is not available an end fed long wire antenna approximately 250 ft can be used One end of the lo...

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Страница 22: ...sonates at desired freq 1600 kHz C 30pf 540 kHz C 600pf 6600 2601 Rev A Figure 2 2 AM Antenna Installation Diagram If a local AM antenna is not available an end fed long wire antenna approximately 250 ft can be used One end of the long wire should be connected to the 886 rear panel ANT 75Q connector For moderately strong signal areas an alternative to the long wire antenna connection shown above c...

Страница 23: ...piezoelectric tuning fork filters are used to achieve a bandwidth of 5 Hz from each tone frequency This integral two tone EBS generator produces the 853 Hz and 960 Hz tones simul taneously with an accuracy of 0 25 Hz Tone amplitudes may be observed and adjusted individually The front panel of both systems contains both test and on air transmission switches two 2 digit LED displays which show the n...

Страница 24: ...y switch 3 GENERATOR ON AIR momentary switches Function Used to test the operation of the two tone generator without interrrupting normal programming In the TEST position the speaker is on and there will be no d lay If however the SPEAKER ON STANDBY switch is in the STANDBY position you will experience a delay The delay is dependent on switch positions of DIP switch SWlO the Time Delay for De muti...

Страница 25: ...sition the speaker will automatically turn on when one of the following conditions exists after the de muting delay set by SWl0 on the Main Board refer to Section 2 Paragraph 2 3 of this manual for switch position information 1 the GENERATOR RESET TEST switch is in the TEST position 2 the GENERATOR ON AIR switches are placed in opposing directions as indicated by the positions of the arrows on the...

Страница 26: ...T pushbutton outtage affecting the days since the last switch dual tone signal was transmitted 12 DAYS SINCE LAST LED displaying the number of days since the TRANSMISSION 886 887 was used to transmit a dual tone signal calendar display It resets to O zero after transmitting the dual tone signal It will increase by 1 each day after transmitting the dual tone signal On day 12 the display will begin ...

Страница 27: ...to connect an external speaker to the Model 886 887 Connects to the exciter or transmitter modulation input Connects to the stereo generator output When the EBS ON AIR is activated the composite output switches to the dual tone circuit After the dual tone signal the unit will switch back to the program For connecting an antenna to the 886 887 Label for Jl J2 and J3 pin connections Adjusts the prog...

Страница 28: ...RIGHT CH BALANCED OUTPUT Audio program output normally connected to the transmitter or exciter audio balanced input When BBS ON AIR is activated the internal relay disconnects the external audio program from pins 1 and 2 and allows the dual tone signal to the transmitter When the dual tone is over the loop thru is reconfigured in order to connect the audio program signal J2 pin 3 Ground J2 pins 4 ...

Страница 29: ...dio input connected to the external audio program balanced output Normally the external audio program with loop thru pins 9 and 10 are connected to pins 6 and 7 respectively of J2 These are connected to the outside transmitter balanced input When EBS ON AIR is activated the internal relay disconnects the external audio program and allows the dual tone signal to the transmitter When the dual tone i...

Страница 30: ...r TEST during dual tone transmission To activate pull pin 11 to ground by connecting a remote control momentary to ground switch or equivalent to these pins Pin 10 is ground 1 2 amp fuse for the ac line Ac line cord for 117 Vac to the 886 887 Adjusts the output level of the dual tone alarm signal The following paragraphs describe the operation of the 886 and 887 EBS Systems both as receivers and t...

Страница 31: ...muting circuit mutes the speaker To turn the speaker on place the SPEAKER ON STANDBY switch 5 to the ON posi tion The audio program will be on the speaker c Tune the speaker for optimum listening by adjusting the rear panel VOLUME control 22 3 4 3 Operation of the Two tone Generator AM and FM To transmit a dual tone signal perform the following a Place the two GENERATOR ON AIR switches 3 in opposi...

Страница 32: ...NO UNUM OTNPWIN SHC NIIOMS AM IN INCHII lOLatlANCalAM l MCT10NI NCNM I ANCILU DI Ill ATIJtlAL NIIH 41 NUCTAUY UUDON APPLICATION DO NOT SCALE DRAWING CONTIIACT NO REVISIONS OHCtlPTIOfl DATE Vl tlOYm A RELEASfiO TO PROO DAff _NCLAYUM Otl DUCllll TIOM PARTS UST FIG 3 1 111 ATIIIIAL PICIACATION MODEL 886 FRONT I REAR VIEW ILLUSTRATION DWG NO 6800 2598 REV A SCALE SHEET 1 OF 1 ...

Страница 33: ...RI CONTIIACT NO l fUoCT10NS OICIMALa ANGLI r 1 U lWI MATERIAL 187 1 1 l INIIH NEXT AIIY USED ON APPLICATION DO NOT SCALE DRAWING Al PIIOVALI REVISIONS IIIV OISCRl TION A REL ASED TO PROD NOIIENCUTVIIE OIi Dl ICIIIPTION PARTS LIST IUAL ttWf lfttL 0 DATE FIG 3 2 MATEIIIAL Sl ECl 1CATION DATE MODEL 887 FRONT REAR VIEW ILLUSTRATION DWG NO 6600 2599 SCALE SHEET 1 OF 1 I I I I I I I I I I I I I I I I ...

Страница 34: ...R6 LED on the Main Board is on the 960 Hz filter circuit is operating properly With SW2 in the TS3 position the 853 Hz tone is selected and sent to its corresponding filter When the CR7 LED on the Main Board is on the 853 Hz filter circuit is operating properly With the speaker enabled either tone can be heard The ON AIR switches SW3 and SW4 work together to produce a dual test tone With these swi...

Страница 35: ... high 017 is on thus muting the receiver audio signal to the filter circuit The 1 S CLOCK comes in to the dual tone generator circuit from the time base circuit on the Main Board It uses the ac power line frequency either 50 or 60 Hz as a reference Place a jumper at either the 50 Hz PRESET or 60 Hz PRESET location A jumper in the appropriate frequency location selects the corresponding frequency f...

Страница 36: ...evel Demuting circuit RF LEVEL output line goes to the front panel RF LEVEL bar graph display for monitoring the program RF level SW5 is the SPEAKER ON STANDBY switch which is connected to the demuting circuit When SW5 is in the SPK EN position the SPK ON OFF output is enabled and the speaker is on With SWS in the SPK DIS position the SPK ON OFF output is disabled and the speaker is off The EBS AL...

Страница 37: ...ls are mixed The resulting output is a dual tone signal at U15 pin 8 Length of the dual tone signal is dependent on the 1 second timebase generated at U32 This timebase goes to Ul0 pin 9 where it is divided by 3 to get a 1 3 second pulse This pulse is fed to Ul0 pin 1 the programmable counter where the position of switch SW9 controls the duration of the dual tone signal for either 6 12 or 24 secon...

Страница 38: ... is fed to three different paths First the signal goes to amplifier U15 pin 13 via R22 and C21 The dual tone signal is amplified here with an output at U15 pin 14 This output is fed to two filters FLl and FL2 The tones are separated by the filtering process FLl filters out the 960 Hz FL2 filters out the 853 Hz The 960 Hz out of FLl goes to U16 pin 2 and out at U16 pin 1 This output is fed to CR2 a...

Страница 39: ...l be high This high is connected to U19 pin 6 a 1 second pulse from U47 pin 4 is fed to U19 pin 5 C132 and R133 at Ul9 pin 5 differentiate the leading edge of this I second pulse to U19 This pulse triggers programmable counter U20 which is connected to the output of U19 SWl0 is a DIP switch at U20 This switch sets the demuting time to either 2 4 or 8 seconds depending on the switch position The ou...

Страница 40: ...s also fed to U25 and generates a pulse at pin 9 when the ON AIR switches are placed in opposite positions Pin 9 of U25 is connected to U40 pin 6 The leading edge of this pulse is used to reset the DAYS SINCE LAST TRANSMISSION calendar display to O zero SW5 is the front panel SPEAKER ON STANDBY switch In the ON position a high is present at U23 pin 11 and at U23 pin 9 the output This high output t...

Страница 41: ... and U40 to reset U28 This 1 pulse 1 day also goes to U26 via a series of gates and inverters to be divided by 30 U26 has two counters The first counter divides this pulse by 3 the other divides it by 10 The output of U26 goes to U34 and U35 then to the 7 segment drivers to drive the front panel DAYS SINCE LAST 1RANSMISSION calendar display U34 drives the tens digit U35 drives the ones digit U26 r...

Страница 42: ...d is used to reset the DAYS SINCE LAST RECEPTION calendar display to 0 zero 4 2 4 Power Supply Voltages Power supply voltages used for the EBS System are generated on the Main Board Ac comes from the ac line cord to the primary of Tl From the secondary of Tl the voltage goes to a bridge rectifier to get two unregulated de voltages 22 V and 11 V The unregu lated 11 Vde goes to regulators U49 and US...

Страница 43: ...outed to the tuned circuit consisting of C41 C60 and CRl 1 This circuit is used to change to the desired station The AM signal is also routed to the secondary of transformer Tl and to U15 pin 4 In U15 the RF amplifier amplifies the AM signal C4 CS and CRl 2 make up the local oscillator L O circuit The signal from the L O goes to U15 pin 12 Ull and U12 make up the voltage controlled oscillator VCO ...

Страница 44: ...End Block consisting of a mixer a voltage controlled oscillator VCO and other components A 10 7 MHz IF sig nal is generated at Zl and sent out at Zl pin 5 The signal is filtered at FLl and sent to 03 to be amplified From Q3 the signal goes to FL2 to be filtered and then to the IF amplifier Ul pin 1 Ul and quadrature detector 1 3 located at Ul pin 9 take the IF signal and generate an audio output a...

Страница 45: ...t that goes to emitter follower Q6 From Q6 the signal goes to C69 and then to the Ql Q2 amplifier to U3 pin 1 Here the signal is divided by 2 The resulting signal is sent out of U3 at pin 5 and goes to U3 pin 13 The signal is divided by 2 at U13 and this output goes out at pin 8 to a divide by N circuit The divide by N circuit consists of U4 U13 U7 US U9 and UlO This divide by circuit is programme...

Страница 46: ...res in this section Test Equipment 1 Digital multimeter accurate to within 0 1 2 Distortion analyzer 3 Frequency counter up to 1 GHz 4 Oscilloscope with 100 MHz or better bandwidth 5 RF signal generator SQQ impedance with 88 108 MHz FM 500 1700 kHz AM output 5 2 AM Receiver Performance Checks The Model 886 AM Receiver s sensitivity and AGC range should be checked periodically The following paragra...

Страница 47: ...10 Vde 5 2 2 AM Receiver AGC Range To check the AM Receiver AGC range perform the following a Ensure the signal generator is connected to the ANT 75Q connector 20 on the 886 rear panel and its output is set to 540 kHz and AM modulation to 50 at a 1 kHz rate Set the output level to 10 µ V b Connect an oscilloscope to the RX AUDIO BALANCED terminals pins 11 and 12 of Jl on the 886 rear panel c Incre...

Страница 48: ...ar panel f Slowly increase the RF level of the signal generator to approximately 2 µV The voltage on the multimeter at the CARRIER FAIL terminals should in dicate a change from OV to 10 Vde 5 3 2 FM Receiver AGC Range To check the FM Receiver AGC range perform the following a Ensure a signal generator is connected to the ANT 75Q connector 20 on the 887 rear panel b Using the FREQUENCY MHz pushbutt...

Страница 49: ... take a thin insulated instrument and depress the corresponding SET pushbutton switch 8 for DAYS SINCE LAST RECEP TION SET switch or 11 for DAYS SINCE IAST TRANSMISSION SET switch on the 886 887 front panel 5 6 Receiver Audio Output Adjust The EBS receiver audio output adjustment procedures for both AM and FM Receivers are described in the following Paragraphs 5 6 1 and 5 6 2 below 5 6 1 AM Receiv...

Страница 50: ...r on the distortion analyzer adjust R6 on the Main Board for 8 dBm e Replace the top cover 5 7 Receiver Audio Signal versus Dual tone Signal AM and FM It is suggested that a 1 1 ratio exist between the receiver audio signal and the dual tone signal for both AM and FM EBS Systems To adjust for this 1 1 ratio perform the fol lowing a Remove the 886 887 top cover and locate R56 on the Main Board b En...

Страница 51: ...www SteamPoweredRadio Com AM and FM EBS Systems SECTION 6 DIAGRAMS AND SCHEMATICS ...

Страница 52: ...U16 4 NJOIO f OW R 300 300 JOO 300 Kl ill 300 300 800 EBS 6 KI EBS AIAAM EBS RECVD 1 RX C0Ut T R SET O U T SNO RESET _____________________J I TX COUN tR SCT OUT J AC 117V POWER SUPPLY 5 20 Y IJNlitECU 12 5 4 DAYS SINCE LAST RECEPTION COUNTER 1 S Cl OCK TIME BASE 50 it 888 887 5ot 4 o88 _ _ DAYS SINCE LAST TRANSMISSION COUNTtR 50 50 H H Pft SET 3 5 lq PRESCT ll ICIFICATIOIII Utlllll OTMIIIWISI NOTH...

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Страница 68: ...MENCLATURE OR DESCAIPTION I FIG 8 10 MATERIAL SPECIFICATION PARTS LIST UNLESS OTHERWISE SPECIFIED Dl NStONS ARE IN INCHES TOLERANCES ARE FRACTIONS DECIMALS ANGLES xx xxx CONTRACT NO APPROVALS DATE MATERIAL 887 Dfl N _ _ f P C r i c I f7r f f TIME FREQUENCY JILC JIL TECHNOLOGY INC OOMPOSITE LOOP THRU I 888 Fl N IS H 1CHECKEO C r I I r J Cl ra s ZE F SC_M_N0 1 D_W_G_N_O __________ R E V I ___ NE_ XT...

Страница 69: ...ONS ARE IN INCHES TOLERANCES ARE FRACTIONS OECIMAUI ANGLES CONTRACT NO r 41 xx SH REV RE OESC RIPTION NOMENCLATURE OR DESCRIPTION PARTS LIST REVISIONS APPROVED FIG 6 11 MATERIAL SPECIFICATION xn t APPROVALS DATE PCB ABSY COt POSITE LOOP Tl HJ 887 MATERIAL t __ 8_8_8 __ 11 ANISH NEXT ASSY USED ON DWG NO 6608 3734 APPLICATION DO NOT SCALE DRAWING SCALE l SHEET 10F 1 I I I I I I I I I I I I I I I I I...

Страница 70: ...pThrv8oent en au D SClllrT ION J 00t C ONN NC ANQlr Pr HNT l002 CONN INC ANGLE NNl J IIIIII C IINN 1 2P I N MOLE I AN il t 001 RHAY s or 17V ll H PC l P E COMPOS TE t01 P 1MRU f 001 6 A I I 100 C TR PCB Y 6 G8 37l4 lleo A qn TfTSTOCt NO t _ 14H0 I vi q nl I 11 HI I I 1am 1 I 1 1 4 l Page I of I ...

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