[MRCA] Crystals ID

[Michael Hanz]

Not sure what other radios they might have served, but the Bendix dual 
frequency three contact crystals were used in WWII Bendix aircraft 
transmitters, like the RTA-1B (one of the variations was also known as 
the AN/ARC-9), and the entire TA-2* series (there is a photo of the 
crystals about halfway down the page at 
https://aafradio.org/flightdeck/TA-2J.html ).  I think the TA-6 also 
used them.

Your two crystals have a red ink SC stamp reflecting Signal Corps 
inspection by Inspector Number 7549, which has nothing to do with the 
crystal type.  The stamp was also superseded about the end of the war by 
a  Signal Corps eagle, so these came from the WWII period.

- Mike

On 1/18/2020 3:53 PM, Thomas Chirhart wrote:
> I found these two in my crystal box while looking for a 4075 for another member.
> Bendix Aviation SC7549A
> 5133/5588 and 5202/5662
> 455 IF
> Same size and configuration as crystals for the TCS rigs.
> Any ideas what radio they go to? Did Bendix make crystals for the TCS? A 5 Melgar could have been a TG/TF common channel or Harbor Control...or?
> 73 Tom K4NCG