[Milsurplus] Crystal Curiosity

[Nick England]

Those are the IF frequencies generated by 2-tone test generator SG-376A/U

"Transistorized two-tone IF Signal Generator for testing SSB equipment. Has
two 20 - 20Khz audio oscillators and two independent IF oscillators. IF
outputs 497.5, 498.5, 501.5, or 502.5Khz . Output levels 2-2.5 V into 600
ohms (AF); 1-1.25 V into 60 ohms (IF) with attenuation to 100 db in 1 or 10
db steps. The AF and IF signal outputs are independent of each other.
Generates two separate AF signals which can be used independently, one at a
time, or both can be added for simultaneous use. It also generates four
different, unmodulated IF signals which are available independently, one at
a time, or in specific pairs simultaneously."

I have posted the manual at
http://www.navy-radio.com/manuals/sg376a-man.pdf

Nick England K4NYW
www.navy-radio.com

On Tue, Apr 25, 2017 at 5:59 PM, Tom Brent <navyradiocom at gmail.com> wrote:

> I was sorting through a pile of recently acquired quartz crystals today (I
> know, I need to get a life) and came across four in HC-6/U cases, all made
> by a firm named Hill in 1967 with the following frequencies:
>
> 497.5 KHz
> 498.5 KHz
> 501.5 KHz
> 502.5 KHz
>
> I presume these are for something operating with a 500 KHz center
> frequency, can anyone tell me what equipment it might be?
>
> Happy tinkering.
>
> Tom
>
>
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