[Milsurplus] SCR-183 question

[Mike Feher]

Hue & Group -

Hue you are totally wrong on this one. I never talked about calibration,
just plain alignment. since the receiver is a TRF, all stages have to tune
in unison, meaning, all RF stages have to track. That is if you want a
receiver with some sensitivity. With regards to the CW operation, there is
still one main frequency to which the receiver is tuned even though it may
be broad. It is that tuned to station that needs to be heterodyned against
in order to properly demodulate the CW, so, the local oscillator had to
track the main tuning also for BFO injection. I did talk to an OT who used
to work for Philco when they made these sets and was recollecting some of
these memories and problems of alignment to me. It makes perfect sense.

I also have one of these receivers with a commercially made AC power supply
to go along with it. The original nameplates were removed and theirs
inserted in place. The plates on them now say the were made by the "Wave
King Co." " Type PX". The power supply, interestingly, also has the slide
type hold down clamps as if intended to be shock mounted. The receiver still
has them on also. Wonder if anyone has ever seen another set similar to it?
It is the only one like it that I have come across. It works fine on AM and
CW, but everything, RX, PS and coils have matching serial numbers. The
rectifier is transformerless and half wave, and both receiver and power
supply have a "Warning" tag on them to observe polarity of the AC plug. 73 -
Mike




Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193


----- Original Message -----
From: <Kargokult@aol.com>
To: <milsurplus@mailman.qth.net>
Sent: Friday, April 19, 2002 4:02 AM
Subject: Re: [Milsurplus] SCR-183 question


> <<
>  I think coilsets were matched to individual receivers, and they were not
>  supposed to stray. William Donzelli  aw288@osfn.org >>
>
> --However, in actual practice, it mattered not at all, anyway, right?
> I mean, how much is selectivity affected, when you have 4 LC
> circuits at 3105 or 4495 ?
> Accuracy of dial calibration: What dial calibration?
> Probably the same holds for RU series: the 12 and 24 volt sets
> have different marked coils, but the coils are all interchangable.
> But now 3 tuned circuits selectivity. As for calibration of the
> dial for operation under CW, with CW osc on, still no problem:
> there's essentially no dial resolution anyway, and moreover,
> you used the LM to set to frequency, either in the air or on the
> flight deck.
> Re the recent auction appearance of an ARB dustcover, i note that
> it does not provide for a ZB / ARR-1 to be mounted atop the ARB.
> I don't quite get that, since i've seen even less sign that any such
> expanded dustcover existed. A cover did exist for the ARR-1 / ZB.
> ( In fact, i have several, which i want to hand out this summer, to
> requestors.) Oh, yes, i sorta don't think the ZB cover was for
> "security", as factory and Navy photographs show this VHF
> navig adaptor right there in full view.
> BTW, my rationale for avoiding owning dynamotors for aircraft
> sets, besides the fact that i hate them and can't maintain them:
> i've seen what i call "local unit manufacture" power supplies and
> other odds & ends that never made it to any manual ( oh- i take
> that back - i do have a manual for an RU/GF  ACPS ), i mean
> never made it to any catalog, but were built for bench setups
> for testing. So there existed non-nomenclatured, unofficial AC
> supplies - like the ones i want to build.
> Regards, Hue Miller
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