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R.L.DRAKE 1-A, Инструкция, Страница: 4 / 27

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Содержание 1-A

Страница 1: ...tantaneous muting and recovery With respect to these points and to simple functional design this receiver sets new standards in sideband reception The receiver also works very well on CW due to the si...

Страница 2: ...frequency conversion establishes this same stability for all bands SENSITIVITY Less than l uv for 20 db s n ANTENNA ATTENUATOR 30 db Switch provided to switch pad in or out SELECTIVITY Multi section s...

Страница 3: ...6BJ8 AVC amplifier and rectifier GAB4 crystal oscillator 6BQ7A V F oscillator 12BA6 calibrator oscillator 12AU7 L F oscillator and lst AF 12AQ5 AF output 12X4 rectifier FRONT PANEL CONTROLS Band switc...

Страница 4: ...minals The output impedance of the A is 4 chms C MUTING NOTE THE EXTERNAL MUTING SHOULD BE USED IN ALL CASES WHEN THE 1 A IS USED WITH A TRANSMITTER An RCA phono jack is provided on the back of the re...

Страница 5: ...her directly or through balun coils or antenna tuner Feeding the receiver from high impedance line or non resonant antenna will result in an apparent loss in sensitivity Antenna relay 1s recommended f...

Страница 6: ...ations 3 SIDEBAND TUNING Used to select desired sideband The white band painted on the knob represents the passband of the receiver The center line on the front panel represents the fixed reinserted c...

Страница 7: ...RF GAIN control does not affect the audio volume AVC action or S meter reading so long as the control setting is such that the incoming signal still moves the S mcter Backing off this control heyond t...

Страница 8: ...nsmitted Adjust ANTENNA TRIMMER for maximum signal strength mat the AY GAIN contro tc produce the desired listening leve et the AP GAIN contro to produce the desired Hstening level VeOru F481 wRwrre C...

Страница 9: ...come out with a fixed frequency of 1100 ke the frequency of the ndt F The third mixer a 6BY6 is self excited from its oscillator section which ts running at 1050 kc The 1050 ke oscillator is mixed wi...

Страница 10: ...M3AIZ0 3YN ONVES AIS V TSGOW WVYo VIC 400718 Nivo NIVO ONINNL dy anvassv d SNINNL Govel Lnvel 2nve 9289...

Страница 11: ...low noise RF stage The plate circuit s tuned to resonance with the RF coils They are tuned to the center of each band Since the 2 9 3 5 mc coupler has a peak on each end of the band and a dip or valie...

Страница 12: ...urned to the AVG line Its plate is coupled to the converter tube signal grid through two double tuned I F transformers at 1100 mc VFO V 5 This stage utilizes a 6BQ7A which was selected for its high Fi...

Страница 13: ...ed as an AVC amplifier tube for the AVC condenser The 6BJ8 9 triode low impedance charging a w 5 a There are two separate AVC voltages produced by this circuit One is applied to the RF and mixer tubes...

Страница 14: ...f the I F ampitfier and its BFO injection grid is connected directly to a low impedance tap on the 50 kc BFO coil to obtain the proper injection voltage The output plate is connected to the 3 kc low p...

Страница 15: ...is connected to the phones speaker jack on the rear of the receiver This is a closed circuit jack which opens the circuit to the AUDIO OUT screw terminal when a plug is inserted This will shut off th...

Страница 16: ...lose proximity so that they may be read at the same Ume Internal Speaker A specially designed communications speaker has been built into the 1 A and it will be found to be superier to an ordinary spea...

Страница 17: ...est to not rely too heavily upon tube checkers The best check is direct substitution of the tube or tubes In question C ALIGNMENT PROCEDURE WARNING DUE TO THE BANDPASSED CIRCUITS EMPLOYED IN THIS RECE...

Страница 18: ...ntaccs or minimum S meter ceading iowest point of a sharp dip This will be only a very small change but it is enough for proper adjustment of the crystal oscillator Do not use a signal for this edjust...

Страница 19: ...bottom screw of T for minimum S meter reading i Repeat steps d through h G Remove signal generator and 0 5 mmf capacitor k Repeat checks in section 4 above RP ALIGNMENT a Set dial te 3800 kc Do not mo...

Страница 20: ...d tune generator to center of any band b Peak MAIN TUNING on generator signal and peak ANTENNA TRIMMER c Set output of signal generator for 100 microvolts and adjust METER SENS pot inside receiver for...

Страница 21: ...yooTosJojUNOD ATTN NIVD JW 9stMyxAoOTO Atta NIVD Ju eaptedal uc yOITMs AGGNWLS syejew cp uo YOITMS pueg YIM usyeR sjUsWAMseaI paloU esIMIOYIO SssoTUN JOJOW JOA Jed WYO OOO T UM Usye SJUOWeINseaW O V r...

Страница 22: ...loyboul paipuny may ve moYs AvwW FUT pexiPW aie ey sSutpesi syy jo IsOW swyotld 4 swyobsw W pacoauuo0d STP aUTT O Y pejoeuuods p euUae asTMRDOTOJEIUN OD ATTN NIVD AV oestMAoOTO ATM NIVD Ju 8aTe001 UC...

Страница 23: ...ak and or distorted but S meter reads normally Normally closed contacts on phone jack not making good connection Replace Throw switch down to remove attenuator Repair retune or revise antenna system C...

Страница 24: ...s no effect Replace S meter against pin on right side and no signals can be heard Muting switch open Replace Replace Set dead but tubes and pilot pulbs lighted Tuning dial reads off frequency Dial poi...

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Страница 27: ...CRYSTAL CALIBRATOR SGHEMATIG DIAGRAM...

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