[Milsurplus] ATA, SCR-274-N, AN/ARC-5 Transmitter Calibration Crystals

[Mike Hanz]

Beautiful writeup, Mike!  If anyone could dig up the information, I 
figured you'd be the one.  Thanks for all the research.

Just to muddy the waters further, I note with puzzlement that the two 
T-18/ARC-5 transmitters wandering around here somewhere have a 2601 kHz 
and a 2604 crystal stuck into their respective sockets. Making the 
puzzlement more puzzling, the set of crystals for the O-4/ARC-5 Crystal 
Frequency Generator at http://aafradio.org/flightdeck/arc5-3.htm has a 
2604 kHz crystal stuck in the hole clearly marked 2609 kHz!  Makes one 
wonder what they were thinking... :-)

Very 73 and well done,
  - Mike  KC4TOS

On 3/15/2013 3:07 PM, Mike Morrow wrote:
> The 1944 manual AN 16-30-ARC5-2 for the AN/ARC-5 lists **no** specific frequencies.
> Mike Hanz lists the following frequencies at http://aafradio.org/flightdeck/arc5-2.htm .
> These agree with the units in my collection, with one exception:
>
> T-15/ARC-5  0.5 to 0.8 MHz    0.8 MHz
> T-16/ARC-5  0.8 to 1.3 MHz    1.3 MHz
> T-17/ARC-5  1.3 to 2.1 MHz    2.1 MHz
> T-18/ARC-5  2.1 to 3.0 MHz    2.601 MHz**
> T-19/ARC-5  3.0 to 4.0 MHz    3.265 MHz
> T-20/ARC-5  4.0 to 5.3 MHz    4.435 MHz
> T-21/ARC-5  5.3 to 7.0 MHz    5.505 MHz
> T-22/ARC-5  7.0 to 9.1 MHz    8.87 MHz
>
> **I have a T-18/ARC-5 whose Y-50 is 2.604 MHz.