[TMC] Odd plug-in on FFR receiver

[Duncan Brown]

The extra "block" looks like it is plugging into the crystal socket, so 
your guess of a crystal oven is a good one.

have fun,

Duncan
K2OEQ

On 6/15/2019 14:46, Nick England wrote:
> Here's a 1967 photo at the NAVCOMMSTA Iceland receiver site
> http://www.navy-radio.com/commsta/iceland/iceland-jd-1705-09.jpg
> Three of the FFR receivers (AN/FRR-49) have a very odd "something" where
> the tuning unit plugs in. What the heck is that? Maybe an add-on crystal
> oven?
>
> FWIW More 1967 photos here -
> http://www.navy-radio.com/commsta/iceland.htm#jd
>
> Cheers,
> Nick England K4NYW
> www.navy-radio.com
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