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Page 2: ... 1 Operator Controls and Indicators Front Panel 3 2 Controls and Connections Rear Panel 3 3 Initial Operation 3 4 Normal Operation SECTION 4 THEORY OF OPERATION 4 1 General 4 2 Detail Circuit Destription SECTION 5 ALIGNMENT AND TROUBLESHOOTING 5 1 Equipment Required but Not Supplied 5 2 FMO and Phase Lock Assembly Alignment 5 3 Power A plifier Alignmen 5 4 Exciter Transmitter Interface 5 5 Trouble...
Page 3: ...he rear panel The Exciter is all solid state employing silicon transistors diodes and in tegrated circuits The Exciter features phase locked stabil ity and on carrier direct FM for full multiplex operat ion with freedom from spurious responses The Power Amplifier is capable of withstanding any magnitude or phase of VSWR and the power output is adjustable from less than 5 to greater than 20 watts E...
Page 4: ...75 usec de emp AM Noise Stereo Separation Crosstalk Main to SCA Crosstalk SCA to Main Environmental MECHANICAL SPECIFICATIONS Dimensions Mounting Dimensions Net Weight Shipping Weight Maximum Operating Temp JYpp for 10 inj ection 0 35 max THO 75 KHz dev Better than 70dB Better than 55dB Better than 40dB from 30Hz to 15KHz with QEI Model 772 Stereo Generator 55dB 65dB 0 C to 55 C operating 15 C to ...
Page 5: ... All correspondence to your sales representative or the factory in regard to this unit should reference the complete Model and Serial Numbers 1 5 ACCESSORIES The Exciter may be used as a 10 Watt Transmitter with the accessory Meter Panel This Panel contains Final Amplifier and Incident and Reflected Pow er Metering di ectiorial oupler nd ignal sampler 5 ...
Page 6: ...a 210 250V single phase 50 or 60 Hz power source The identification place on the back panel shows for which power source the unit is wired See Section 5 5 for information on changing taps Connect a suitable 50 ohm RF load to RF OUT jack Jl using a type N connector and RG 8 U or equivalent cable tonnect Mono audio line to TBJ and or Stereo Generator to COMP jack J2 Connect SCA Generator to either S...
Page 7: ...presentative for a Return Authorization Attach a tag showing owner s name and address A description of the service required should also be included Unit must be shipped prepaid and insured for full value Use the original shipping carton and packing material for re shipment If they are not available proceed as follows A Use a carton with minimum test strength of 250 lbs B Use heavy paper or sheets ...
Page 8: ...d below app roximately 12 watts output it is recommended that the tap on the power transformer secondary be moved to the 75 point This will limit the maximum output power to less than 12 watts but will cut down on the pri mary power consumed and lower heat dissipation within the unit See Section 5 6 FREQ ADJ Control R2 This screwdriver adjustment can be used to fine tune the Exciter over a range o...
Page 9: ...ssis ground FUSE Fl and XFl This is the primary power fuse for the unit It is the only fuse nec essary since all power supplies are short circuit protected It should be replaced only with a fuse of the same type and rating as the original 3AG lA 3 3 INITIAL OPERATION l Operate POWER switch and verify that LED CR2 is lit 2 Verify that AFC LOCKED lamp lights and RF output appears within a few second...
Page 10: ...a frequency lock ed exciter Be sure that any frequency error is in the Exciter and not in the measuring instrument before you attempt to tune the Exciter Use signal levels in Section 3 2 to get approximate 100 levels and use an FCC Type Approved modulation monitor QEI Model 671 with Model 771 for stereo or equivalent for exact determination of modulation 10 ...
Page 11: ...trol the FM oscillator sub assembly Thus the programmable divider allows the use of the same high stability 8 MHz reference crystal regardless of channel assignment It should be noted that a phase locked loop required a phase error not a frequency error to generate its correction signal Because of this t he output of a phase locked exciter exhibits long term phase coherence with the reference osci...
Page 12: ...ade to divide by any whole number from 2 to 2000 For operation in the FM band the circuit is made to divide by a number between 881 and 1079 When this is done the output frequency of the prograrrmable divider is 5 KHz when the FMO is operating on the assigned channel Q7 Yl and associated circuitry form a stable 8 MHz crystal os cillator which provides the reference frequency for the system C27 is ...
Page 13: ...Assembly The output of the A2 Assembly approximately 100 mw is applied to Tl Tl and T2 provide impedance matching to the base of Ql the IPA C2 stabilizes the amplifier throughout the power adjust range C7 C8 and L2 provide impedance matching between the collector of Ql and the base of Q2 the PA LS Cl4 and ClS provide impedance match ing between the collector of Q2 and the load CRl and associated c...
Page 14: ...CRl fires discharg ing Cl The resulting pulse causes Ql to momentarily interrupt the holding current through CR3 thereby cutting off CR3 This action resets the supply automatically 15 Volt Regulator Zener diode CR6 is the reference for this regulator Q5 and Q7 amplify the voltage across this diode to approximately 15 volts Q6 acts similar to Q4 if the current drawn from the supply ex ceeds approxi...
Page 15: ...ct the Exciter to a suitable 50 ohm 20 watt RF load through the signal sampler 5 2 FMO AND PHASE LOCK ASSEMBLY ALIGNMENT l AFC Adjustment a Connect a scope to test point 11 L Act j us t A2R47 for the greatest amplitude linear 5 KHz sawtooth obtainable b Connect a scope to pin 6 of A2Ull Adjust trimmer access ible through hole in FMO can until pin 7 shows a DC level Either side of lock will give a ...
Page 16: ... b Apply power to the unit and observe pilot lamp CR2 and AFC LOCKED lamp DSl If lamp does not illuminate refer to FMO alignment pro cedure c Set PWR ADJ control Rl full clockwise Set the MULTIMETER switch S2 to the IPA position Set A3C2 to mid range d Observe an indication of IPA collector current on the multimeter Maximize this indication by adjusting A2C6 and A2C7 of the A2 board e Set the mult...
Page 17: ... point of oscillation be sure to use the 3dB pad It is poss ible to drive large amounts of power back into the Exciter from an oscillat ing IPA thereby destroying the output transistor 5 5 TROUBLESHOOTING Refer to schematics for waveform and voltage information Using these the theory of operation in Section 4 and the test equipment listed should allow a competent engineer to diagnose most problems...
Page 18: ... Change a If Exciter is to be used below to CRl instead of Yellow lead wer to approximately 12 watts within the unit 12 watts connect Red Yellow lead This change will limit output po but will reduce heat dissipation b Change A4Rl0 from 820 ohm to 1 5K This insures that the IPA PA supply stays in regulation with the reduced input voltage c Change A4Rl9 from 120 ohm 2 watt to 68 ohm 2 watt This insu...
Page 19: ... 7 0 X 94 9 0 TABLE 5 1 PROGRAM KEY 0 0PEN Cl Dl A2 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X 19 SHORT B2 C2 D2 A3 B3 C3 D3 X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X x X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X ...
Page 20: ...0 X X X X X X X X 98 5 0 X X X X X X X 98 7 0 X X X X X X X 98 9 0 X X X X X X 99 l X X X X X 0 X X 99 3 0 X X X X X X X 99 5 0 X X X X X X 99 7 0 X X X X X X 99 9 0 X X X X X l 00 l X X X X X X X X X X X X 100 3 X X X X X X X 100 5 X X X X X X X X X X X l 00 7 X X X X X X X X X X 100 9 X X X X X X X X X X X l 01 l X X X X X X X X X X X l 01 3 X X X X X X X X X X l 01 5 X X X X X X X X X X 101 7 X...
Page 21: ...X X X X X X 104 5 X X X X X X X X X X 104 7 X X X X X X X X X 104 9 X X X X X X X X X X 105 1 X X X X X X X X X X 105 3 X X X X X X X X X 105 5 X X X X X X X X X 105 7 X X X X X X X X 105 9 X X X X X X X X X 106 1 X X X X X X X X X X 106 3 X X X X X X X X X 106 5 X X X X X X X X X 106 7 X X X X X X X X 106 9 X X X X X X X X X 107 1 X X X X X X X X X 107 3 X X X X X X X X 107 5 X X X X X X X X 107 ...
Page 22: ...f 110 7102 AlC14 Cap Feed thru lOOOpf 110 7102 AlC15 Cap Feed thru lOOOpf 110 7102 AlC16 Cap Elect 500uf 25V 110 3507 A1Cl7 Cap Cer 05uf 110 0503 A1Cl8 Cap Cer _ 05uf 110 0503 AlC19 Cap Cer Oluf lOOV 110 0103 Al CRl Rectifier Bridge 113 1000 AlCR2 Di ode LED 113 3000 AlDSl Lamp Incandescent 28V 327 117 0002 A 1Fl Fuse AGC 1 120 0002 AlJl Jack RF UG 58 130 0004 A1J2 Jack Coax UG 625 130 0001 AlJ3 J...
Page 23: ... Tant 1 0 uf 110 3105 A2Cl3 Cap Mica 470 pf 110 1471 A2Cl4 Cap Cer 001 uf 110 0102 A2Cl5 Cap Cer 01 uf 110 0103 A2Cl6 Cap Cer 01 uf 110 0103 A2Cl7 Cap Poly 01 uf 5 110 4103 A2Cl8 Cap Mica DM15 SELECTED A2Cl9 Cap Mica 24 pf DM15 110 1240 A2C20 Cap Mica 120 pf DM15 110 1121 A2C21 Cap Cer nJ uf 110 0103 A2C22 Cap Cer ooi uf 110 0102 A2C23 Cap Elect 5 0 uf 110 3505 A2C24 Cap Mica 470 pf DM15 110 1471 ...
Page 24: ... Transistor PNP 160 4403 A2Q9 Transistor NPN 160 4401 A2Ql0 Transistor NPN 160 4401 A2Qll Transistor NPN 160 4401 A2Ql2 Transistor NPN 160 4401 A2Ql3 Transistor NPN 160 4401 A2Ql4 Transistor NPN 160 4401 A2R l Res Carb 2 2K W 5 RC20GF222J A2R2 Res Carb 560 Ohm W 5 RC20GF561J A2R3 Res Carb 51 Ohm W 5 RC20GF510J A2R4 Res Carb 270 Ohm vJ 5 RC20GF271J A2R5 Res Carb 2 2K W 5 RC20GF222J A2R6 Res Carb 22...
Page 25: ...3J A2R52 Res Carb 270 ohm W 5 RC20GF271J A2R53 Res Carb 2 2K W 5 RC20GF222J A2R54 Res Ca rb lOOK W 5 RC20GF104J A2R55 Res Carb 2 7K W 5 RC20GF272J A2R56 Res Carb 1 5K 2W 5 RC20GF152J A2R57 Res Ca rb 470 Ohm W 5 RC20GF471J A2R58 Res Carb 2 2K W 5 RC20GF222J A2R59 Res Carb 1 5K W 5 RC20GF152J A2R60 Res Ca rb 4 7K W 5 RC20GF472J A2R6l Res Carb 820 Ohm W 5 RC20GF821J A2R62 Res Carb 1 5K W 5 RC20GF152J...
Page 26: ...p Var 4 40 pf 110 6440 A3C16 Cap Ce r 0 5 pf 110 00R5 A3Cl7 Cap Ce r feed thru 1500 pf 110 7152 A3CR1 Diode Si 1 113 04446 A3Ll Inductor RF 140 2015 A3L2 Inductor RF 140 2015 A3L3 Inductor Wideband Choke 140 2016 A3L4 Inductor RF 140 2014 A3L5 Inductor RF 140 2014 A3L6 Inductor Wideband Choke 140 2016 A3Ql Transistor NPN 160 5641 A3Q2 Transistor NPN 160 5643 A3R l Res Carb 18K 1 5 RC20GF183J A3R2 ...
Page 27: ...istor PNP 160 40410 A4Q4 Transistor PNP 160 4403 A4Q5 Transistor NPN 160 40409 A4Q6 Transistor PNP 160 4403 A4Q7 Transistor NPN 160 4401 A4Q8 Transistor NPN 160 3053 A4Q9 Transistor NPN 160 4401 A4Rl Res Carb 22K W 5 RC20GF223J A4R2 Res Carb 620 Ohm W 5 RC20GF621J A4R3 Res Carb 1OK W 5 RC20GF103J A4R4 Res Carb 1 SK W 5 RC20GF152J A4R5 Res Carb 2 7K W 5 RC20GF272J A4R6 Res Carb 2 7K W 5 RC20GF272J ...
Page 28: ...27K W 5 RC20GF273J A4R21 Res Carb 820 Ohm W 5 RC20GF821J A4R22 Res Carb 180 Ohm W 5 RC20GF181J A4R23 Res Carb 180 Ohm W 5 RC20GF181J A4R24 Res Carb 6 8K W 5 RC20GF682J A4R25 Res W W 56 Ohm 3W l 0 166 0056 A4R26 Res Carb lOK W 5 RC20GF103J A4R27 Res Carb 180 Ohm W 5 RC20GF181J A4R28 Res Carb 3 3K W 5 RC20GF332J 28 ...
Page 29: ...www SteamPoweredRadio Com SECTION 7 SCHEMATICS LAYOUTS WAVEFORMS 29 ...
Page 30: ...asured on a 15MHz bandwidth oscilloscope using a lOX low A capacity probe The number below each waveform corresponds to the point at which t he W measurement was made l 2usec cm 2V cm 3 lmsec cm 2V cm I I 2 2usec cm 2V cm 4 lmsec cm 2V cm 11 II l I Iii S lmsec cm lV cm ...
Page 31: ...I I PHASE DIVIDER I I I COMPARATOR I I I I I I 5KHz oEo REiM c I I I I I fc IOOmW I A2 FMO a PHASE LOCK ASSEMBLY I I 5vDc 4oomA 15vDc IOOmA _ _ 7 1 I I I 5V LOGIC REGULATOR I5V FMO REGULATOR IPA PA REGULATOR I I 14 24VDC I 5A REVISIOHS l fc 3W RF OUTPUT fc 20W j A4 POWER SUPPLY 8 REGULATOR ASSEMBLY QEI Ho Dole a CORPORATION POWER ADJ 1 BLOCK DIAGRAM 2 J Used on FM EXCITER MODEL 675 FIGURE 4 1 Draw...
Page 32: ... 1 a 1 Tl 240V CONNECT YYYYY T B to C A si c D DRIVEA8D r j SI POWER Fl IA Cl C2 e 1 E Pl r T 01 01 l J J m I c 3 J J CD c RI 5K J6 l POWER I I ADJ R3 5 6K OR J2 COMP FMO OUT I OSI GRN A2 ASSEMBLY l ic3A AFC LOCKED VIO L_ __ 1r C ol_ l 1 5 FMO e I 1 PHASE LOCK J4 r __ t t t c_1 2 i Tl _ 1 REFMTR A 2 I S28 BRN GRAY 6 1 Cl3 I J __ J S3 f t f IFMO MTR MONO T j _COMP 3 4 5 I 02 6 YEL lo TUNE 1 WHT RED...
Page 33: ... C2 5 65pf FACTORY SELECTED ALL VOLTAGES MEASURED WITtf VTVM INPUT 10 MEGOHMS R5 820 PA 23 5V Cl3 150tpf Cl5 AIJ L5 4 40pf 4T 02 2N5643 REVISIONS Ho Dole By 2 s Cl6 10 5pf CRI IN4446 R7 R8 IK IOK LAST USED Cl7 CRI L6 Q2 RII T2 RF OUTPUT Cl7 1500pf T QE CORPORATION POWER AMPLIFIER Uucl on FM EXCITER DrawnBy NAL Date 12 18 75 RF Approwed I Date 6753004 ...
Page 34: ... 1 r 1 f c r J TELECll NE POST 18AE 08E I1X17 7 i J I 1 c _ 1 NO z I 4 IS t E DATE J BY l RAWN BY HK O TRACED QEI CORPORATION ELE COM PONENT LAYOUT A 2 AS SY SCALE MATERIAL DATE DRAWING N O ELE _ _________ 1 19 77 6 752006 APP D ...
Page 35: ..._______ ________ __ __2_4_ o_v ____ _______ o 24 v MOUNTED ON CHASSIS 0 30 4V Q6 2N4403 tLc4 J100 IV Rl6 Q 2N440I Rl5 3 3K 2 2K J ALL VOLTAGES MEASURED WITH v1 vM INPUT 10 MEGOHMS 7 0V RIB 4 7 30 IV Rl9 0 L 120 2W 6ACO 18 SV 05 40409 i5V R20 015M 27K 06AC Q9 2N4401 R23 180 R28 t J Jrvv n L 3 3K C i R22 180 Q8 2N3053 I I I I I I l 8 j AIQ2 e t l 2 5294 I 5 IV E i n R25 56 4 85V L _ n 5V R26 1 N v o...
Page 36: ... Cl3 c12rc11 r oo r 1 a l _c1 _L2 _ T C en l 11r u en 11 POWER AMPLIFIER REVISIONS NO I DATE I BY 7 7 I _ 21 1 13 81 1 3 4 I tl g r mr 1 L5__ OUT T UI Cl7 CpcRljCI 0 u a L Q E I CORPORATIO N DRAWN BY ELE CHK D ELE TRACED COMPONENT LAYOUT A3 ASSY SCALE MATERIAL DATE DRAWING NO 1 19 77 APP D 6751002 ...
Page 37: ...21 Tf Rl7 v cD la 0 er o O Rl6 e 1 u Rl9__ Rl5 l JO Rl4 RII C3 J a a a w 0 a 0 0 z 0 J ct a 0 0 t 0 I a I f z t J rr LIi I I z C z i rr 0 _ _ I O I Ow 0 Ill w a m Cl 0 u 0 UJ w I I UJ I LI m z rr 0 0 i x u LO r U 0 ii a 0 LIi u rr I 1 t if t f 1 Ill I 0 z X a i I LIi 9 LIi IJJ ...
Page 38: ...l A Power Supply 24 VDC t Z lS VDC 10 5 VDC ef 1 s B Power Measurements Serial No l r f Freqpency Distributor Control No ro Power Output 23 W Power Adjust range 5 2 W f A cl t 241 v fA Cut11tEl11 Jil C F requency Meas1 1rements Frequency Frequency Adj t Range D Input Levels 100 tf JSJ Mono for 75 tlon f J Q cl Composite for 7 _ J9iz devla l Qfi 1 S Jf I SCA for 10 ln ec l911 _ 4 2 ...
Page 39: ... Db G Stereo Separation With an input signal of St Distortion Pre emp Level 2 it 0 I 1 71 0 1 K lt I b c It 12 11 0 14 0 3 2 8 0 s f Db separation at 400 Hz and a compensation cap of 7J H Meter Readings pf output signal has separation of S p Db at full power output Vee t z 15 sr 5 It_ t REF I 0 FMO po IPA 1c 0 PA 0 RF C42 Tested by_______ ...
Page 40: ... L R7 R9 L I _ 001 2 2K _ J Nlr C_ SHUT DOWN i 2N QI 2N3866 R2 560 14V I J_CI r470 R24 R23 R22 4 7K 4 7K 47K A1 I Cl 1 5 I 1 0 U3 74192 J 4 II 06 3819 7 2VI 4 BV R46 IK R47 7 IOK R21 47K 9 12 1 3 5 4 C4 15 RIO 51 R20 Rl9 RIB Rl7 l 7K 4 7K 47K 47K A2 8 2 C2 02 I I 1 6 15 I 10 9 12 U4 74192 13 t4 II R63 R38 IOK 47K 15 3V I Cl9 4Vr 24 Q5 15 8V 2N4403 16 5 4 f 47K RS 2 2K Rl6 Rl5 Rl4 R13 4 K 47K 4 7K ...
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