[ARC5] TN-1 and TN-2 Tuning units

[J. Forster]

In an ELINT receiver, especially for characterizing RADARs, you want a
wide bandwidth. It hjas to pass a microsecond class pulse with reasonable
fidelity.

-John

===============



> I have a TN-17 tuning unit, 74-320 MHZ, which I think is the same coverage
> as the TN-2.   I bought it for $4.00 back in the early 80's and once
> combined with a Northrop Ventura drone UHF command receiver to create the
> World's Worst FM Radio Receiver.  It could receive two FM broadcast
> stations at once.  In fact it was almost impossible to not receive two of
> them at the same time.
>
> I have an APR-4Y, the 1952 version, but I have the multiband tuning unit
> for it.
>
> And yes, those TN units were beautifully built.  They look like a small
> car transmission inside.
>
> By the way, I found the acorn tube oscillator could be replaced with an
> FET with absolutely minimal modification to produce a solid state VHF
> oscillator.  Stability was not all that great, though.
>
> Wayne
> WB5WSV
>
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