XPost: sci.electronics.design
From: cd@notformail.com
On Sat, 21 Dec 2024 18:41:59 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:
>Cursitor Doom wrote:
>
>[...]
>> Sorry for the delay; took a bit of tracking down but I have it now:
>>
>> https://disk.yandex.com/i/3SiZ6rN_k-fP4w
>
>Here's my version. I couldn't display the tables as tables, so I have
>repeated the headers as individual paragraphs. One or two bits didn't
>make sense, so I have indicated them with question marks. See the
>originalpublication for the diode probe circuit.
>
>Beware, the text is scattered with roman numerals.
>
>
>
>INSTRUCTIONS FOR ADJUSTMENT
>
>Agjustment on 9v D.C.,
>
>
>Adjustment of the final audio Push-Pull stage.
>
>Insert a milliameter in place of the link at the Collector of AC 188 K
>(use point -x-). Adjust the quiescent current to 6.5mA by means of R410
>(500 0hms). After adjusting the current, resolder the link.
>
>
>Adjustment of the IF amplifier:
>
>By means of R515, adjust the Collector current of T IV to obtain a
>voltage drop of 1.35V across the Emitter resistorR518
>
>-----------------------------
>
>Adjustments FM intermediate frequency 10.7 Mhz Switched to "FM".
>
>Adjustment: F VII
>Couple wobbulator output to: MP5
>Measuring equipment: Diode probe [as circuit] to F VII point 6
>Adjust for: (a) Off tune. ( b) At maximum and symmetrical
>
>Adjustment: F VI & F V
>Couple wobbulator output to: MP3
>Measuring equipment: Diode probe [as circuit] to F VII point 6
>Adjust for: (c) & (d) maximum and symmetrical
>
>Adjustment: F IV & F III
>Couple wobbulator output to: MP2
>Measuring equipment: Diode probe [as circuit] to F VII point 6
>Adjust for: (e) & (f) maximum and symmetrical
>
>Adjustment: FII & FI
>Couple wobbulator output to: ?close? to mixer
>Measuring equipment: Diode probe [as circuit] to F VII point 6
>Adjust for: (g) & (h) maximum and symmetrical
>
>Adjustment: Discriminator
>Couple wobbulator output to: MP5
>Measuring equipment: Across 50 kilohm cable on MP11 (at audio input)
>Adjust for: symetricality. During this sdjustment the signal must be
>very weak so that FI doesn't limit.
>
>-----------------------------
>
>Adjustments AM intermediate frequency 460 Khz Switched to Medium Wave
>["PO".]
>
>Adjustment: F XIII & F XII
>Couple wobbulator output to: MP3 F III
>Measuring equipment: Test point ?? MP4
>Adjust for: (I) & (II) maximum and symmetrical
>
>Adjustment: FXI
>Couple wobbulator output to: MP8
>Measuring equipment: Test point ?? MP4
>Adjust for: (III) maximum and symmetrical
>
>Adjustment: F X & F IX
>Couple wobbulator output to: CV AM, MP7
>Measuring equipment: Test point ?? MP4
>Adjust for: (IV) & (V) maximum and symmetrical
>
>--------------------------
>
>Adjustment of the AM oscillator and input stage.
>
>When aligning Long Wave and Medium Wave, couple to the ferrite rod
>aeraial across the frame [????]. Short Wave alignmnet is done with the
>telescopic aerial unsoldered. The signal is injected by a 15pf
>capacitor into the telescopic aerial terminal.
>
>Medium Wave
>Tuning dial set to 560 Khz
>Adjust oscillator for (1) maximum
>Adjust input circuit for (3) max
>Mixer sensitivity 13uV
>Oscillator output 60 - 90 mV
>
>Medium Wave
>Tuning dial set to 1450 Khz
>Adjust oscillator for (2) maximum
>Adjust input circuit for (4) max
>Mixer sensitivity 14uV
>Oscillator output 60 - 90 mV
>
>Long Wave
>Tuning dial set to 160 Khz
>Adjust oscillator for ---
>Adjust input circuit for (6) max
>Mixer sensitivity 13uV
>Oscillator output 65 - 95 mV
>
>Long Wave
>Tuning dial set to 240 Khz
>Adjust oscillator for (5) maximum
>Adjust input circuit for (7) max
>Mixer sensitivity 10 uV
>Oscillator output 65 - 95 mV
>
>Short Wave
>Tuning dial set to 6.6 Mhz
>Adjust oscillator for (8) maximum
>Adjust input circuit for (10) max
>Mixer sensitivity 5 uV
>Oscillator output 35 - 90 mV
>
>Short Wave
>Tuning dial set to 15 Mhz
>Adjust oscillator for (9) maximum
>Adjust input circuit for (11) max
>Mixer sensitivity 4.5 uV
>Oscillator output 35 - 90 mV
>
>---------------------
>
>Oscillator and IF alignment
>
>Tuning dial set to 88 Mhz
>Adjust oscillator for (A) maximum
>Adjust IF coil for (C) max
>Hiss level around 5 kT0 ... [No idea what that means]
>Oscillator voltage on Emitter of T II 75 - 85 mV
>
>Tuning dial set to 106 Mhz
>Adjust oscillator for (B) maximum
>Adjust IF coil for (D) max
>Hiss level around 5 kT0 ... [No idea what that means]
>Oscillator voltage on Emitter of T II 75 - 85 mV
>
>Notes:
>Inject the signal from an oscillator with an internal impedance of 60
>ohms directly into the mixer. After alignment, coupled by 60 ohms, the
>fundamental of the oscillator into the input of the mixer must be less
>than 2 mV.
I have to say, fair play to you for that effort! It may or may not be
100% accurate, but will contribute with others' to eliminate any
remaining uncertainties with any luck.
Thanks again.
--- SoupGate-DOS v1.05
* Origin: you cannot sedate... all the things you hate (1:229/2)
|
