[Milsurplus] re SCR-522 ( Milsurplus Digest, Vol 137, Issue 35 )

[AKLDGUY .]

As I recall, a great deal of multiplication was needed to get from
crystal frequencies in the low HF region to 120 MHz or so. Something
like 18 or 20 times multiplication. The crystals in those days
consisted of a quartz sheet clamped between two plates.

Such crystals can be very stable at ground level in a moderately
temperature-regulated operating room, but take them up a few thousand
feet and watch them shift. 500 Hz shift at 6 MHz becomes 10 KHz shift
at 120 MHz.

73 de Neil ZL1ANM

On 9/23/15, WA5CAB--- via Milsurplus <milsurplus at mailman.qth.net> wrote:
> Probably tuning (xmtr power out and rcvr sensitivity) drift rather than
> frequency drift.  Although the typical 60 to 140 F temperature variation
> would
> shift the crystals slightly, too.  No ovens in the SCR-522 or 542.
>
> In a message dated 09/22/2015 23:16:50 PM Central Daylight Time,
> kargo_cult at msn.com writes:
>> >Bruce Vaughn/NR5Q (SK) was a USAAF radio tech in the ETO.  He told me
>> that
>> >the SCR-522-A was easily the most important and most used USAAF radio set
>> >
>>
>> >in the ETO.  But Bruce complained of its drift with temperature
>> > change...
>>
>> Mike, how explain this? The set was quartz-controlled both r and t, and
>> the
>> IF surely wasn't that selective, right?
>> -Hue
>
> Robert Downs - Houston
> wa5cab dot com (Web Store)
> MVPA 9480
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