On Sun, 22 Dec 2024 14:05:51 +0000, liz@poppyrecords.invalid.invalid
(Liz Tuddenham) wrote:

>Cursitor Doom <cd@notformail.com> wrote:
>
>> On Sun, 22 Dec 2024 12:37:37 +0000, liz@poppyrecords.invalid.invalid
>> (Liz Tuddenham) wrote:
>>
>> >Jeroen Belleman <jeroen@nospam.please> 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 <cd@notformail.com> wrote:
>> >> >>
>> >> >>> On Sat, 21 Dec 2024 00:05:08 +0100, Jeroen Belleman
>> >> >>> <jeroen@nospam.please> 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 <cd@notformail.com> 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).
>> >
>> >It is interesting to compare the different approaches Jeroen and I have
>> >taken. Although we began with exactly the same source material, we have
>> >produced two markedly different ways of saying the same thing.
>>
>> Well, the important thing is that you agree on the key points.
>> Now it just so happens I have a vintage wobbulator (made by Knight
>> IIRC) which would be ideal for this job. It hasn't been used for about
>> 20 years so it'll probably explode at switch-on, but that's nothing
>> unusual around here as my neighbours will attest.
>
>Just to reinforce the point that Jeroen made, the adjustments interact,
>so you will have to hop back and forth until the error becomes
>negligible. As far as I know. nobody has ever found a way around this
>and it takes up a lot of time at the end of a production line.
>
>A piece of equipment, which was a great help when I had that unenviable
>job, was a signal generator with push buttons to rapidly and reliably
>switch between the end-of-band spot frequencies. I still had to wind
>the dial drive from one end to the other each time - the reduction ratio
>was 110:1. (See <https://eddystoneusergroup.org.uk/Data Sheets/EC10 Oct
>1967.pdf>.)

I popped into a local TV and radio dealer quite recently and asked for
a yard of dial cord. The girl behind the counter had not the first
idea what I was talking about.