XPost: sci.electronics.design
From: jeroen@nospam.please
On 12/21/24 22:07, Cursitor Doom wrote:
> On Sat, 21 Dec 2024 21:31:51 +0100, Jeroen Belleman
> wrote:
>
>> On 12/21/24 14:57, Cursitor Doom wrote:
>>> On Sat, 21 Dec 2024 08:57:51 +0000, liz@poppyrecords.invalid.invalid
>>> (Liz Tuddenham) wrote:
>>>
>>>> Cursitor Doom wrote:
>>>>
>>>>> On Sat, 21 Dec 2024 00:05:08 +0100, Jeroen Belleman
>>>>> wrote:
>>>>>
>>>>>> On 12/20/24 22:16, Cursitor Doom wrote:
>>>>>>> On Fri, 20 Dec 2024 19:32:14 +0000, liz@poppyrecords.invalid.invalid
>>>>>>> (Liz Tuddenham) wrote:
>>>>>>>
>>>>>>>> Cursitor Doom wrote:
>>>>>>>>
>>>>>>>>> Do we have any French speakers on the Panel? I have a radio that's
>>>>>>>>> badly in need of realignment and the only instructions I can find are
>>>>>>>>> a set in French. I can't use Google translate because they've used
too
>>>>>>>>> many abbreviations in the text and they won't parse any sense.
>>>>>>>>
>>>>>>>> I'm not a particularly fluent French speaker, but I could probably
sort
>>>>>>>> out some technical instructions in French If you want to send them
to
>>>>>>>> me, I'll have a go (you should be able to work out my e-mail address).
>>>>>>>
>>>>>>> Many thanks indeed for your kind offer. I suspect it will probably
>>>>>>> require a native French speaker to decypher, but who knows? :-)
>>>>>>
>>>>>> I'm not a native French speaker, but I may be able to help anyway.
>>>>>> Fire away.
>>>>>
>>>>> Well that's interesing as I had did think you might respond given some
>>>>> of the background you've revealed here in the past. I don't have the
>>>>> relevant page here right now, but will make it available tomorrow. It
>>>>> is only the one page and only one column of that, so nothing too
>>>>> onerous. I did show it to a genuine French chum of mine a few weeks
>>>>> ago, but he was stumped by the technical side of it and couldn't
>>>>> assist much, unfortunately. So it appears it needs someone who can
>>>>> speak French fluently *and* understands the process of radio
>>>>> alignment. I kind of guessed that might be you....
>>>>
>>>>
>>>> Many years ago Practical Wireless published an article about the French
>>>> 819-line high-definition television service which had been translated
>>> >from French by someone who knew nothing about television or radio
>>>> terminologyy. It was hilarious nonsense but I eventually managed to
>>>> translate it back into French so that I could understand it.
>>>>
>>>> If you post your text here, we can all have a go at it.
>>>
>>> Sorry for the delay; took a bit of tracking down but I have it now:
>>>
>>> https://disk.yandex.com/i/3SiZ6rN_k-fP4w
>>>
>>> It's only page 1 that needs the translation - and of that, in
>>> particular the abbreviated bits. I haven't read French since I was in
>>> school about a hundred years ago, so it's all Dutch to me. :-)
>>
>>
>> This was translated from German into French by someone who also
>> did not know clearly what it all meant. Not everything makes
>> perfect sense.
>>
>> Also, while it doesn't say so, many of the adjustments interact,
>> so you may have to go back and forth a few times. Anyway, here
>> goes.
>>
>> Jeroen Belleman
>>
>>
>> ===============================================================
>>
>> -- DC current adjustments (for 9V supply)
>> - Adjustment of the push-pull audio stage:
>> Cut the solder bridge marked -x- in the collector trace of the
>> AC188 T11 and insert a current meter. Adjust R410 for 6.5mA.
>> Restore the bridge.
>> - Adjustment of the IF amplifier:
>> Set R515 to obtain 1.35V across T4's emitter resistor R518.
>>
>> -- Adjustment of the FM-IF stages. The radio should be set to "FM".
>> Connect a wobbulator centered on 10.7MHz at MP5 and the diode
>> detector shown at ZF VII (I think...) MP6. Detune ZF VIII (a).
>> Then tune ZFVII (b) for a symmetrical maximum response.
>> - Inject signal at MP3 and tune ZF VI (c) and ZF V (d) for
>> symmetrical maximum response.
>> - Inject signal on MP2 and adjust ZF IV (e) and ZF III (f) for
>> symmetrical maximum response.
>> - Inject a weakly coupled signal at the mixer (MP1?) and adjust
>> ZF II (g) and ZF I (h) for symmetrical maximum response.
>> - Discriminator: Inject signal at MP5, with a level low
>> enough that no limiting occurs in the IF strip. Observe the
>> signal at MP11 (audio amplifier input) with load impedance 50k.
>> Adjust ZF VIII (a) for symmetrical response.
>>
>> -- Adjustment of the AM IF (460kHz) stages. The radio should be
>> set to "PO" (AM, 560-1450kHz). Connect a measurement instrument
>> at MP4 (Weakly coupled).
>> - Inject a wobbulator signal at MP3 and adjust ZF XIII and ZF XII
>> for symmetrical maximum response.
>> - Inject signal at MP8 and adjust ZF XI for symmetrical maximum
>> response.
>> - Inject signal at MP7 and adjust ZF X and ZF IX for symmetrical
>> maximum response.
>>
>> -- Adjustment of local oscillator and AM input. For short and
>> medium wave, couple signal into the ferrite rod antenna using
>> the frame. For short wave, remove the rod antenna and couple
>> signal at the antenna connection through 15pF.
>> Tune to 560kHz and adjust (1) and (3) for maximum response.
>> Mixer sensitivity 13uV and oscillator output 60-90mV.
>> Tune to 1450 kHz and adjust (2) and (4) for maximum response.
>> - Set the radio to GO (Long wave, 160-240kHz).
>> Tune to 160kHz and adjust (5) and (6) for maximum response.
>> Mixer sensitivity 13uV and oscillator output 65-95mV.
>> - Set the radio to OC (Short wave, 6.5-15MHz)
>> Tune to 6.5MHz and adjust (8) and (10) for maximum response.
>> Tune to 15MHz and adjust (9) and (11) for maximum response.
>> Mixer sensitivity 5uV and oscillator output 35-90mV.
>>
>> -- Adjustment of the FM LO. Signal from an RF generator with
>> 60 Ohm output impedance injected directly at the mixer (MP1?)
>> with a loaded signal level <2mV. Set the radio to FM.
>> - Tune to 88MHz and adjust (A) and (C) for maximum response.
>> - Tune to 106MHz and adjust (B) and (D) for maximum response,
>> Noise level is about 5 times kT0. Oscillator output voltage
>> 75-85mV (at T2's emitter).
>
> Thanks, Jeroen. Geez, you just can't win with these bastards. I've got
> a 50 ohm signal generator and a 70 ohm one - but that's not good
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