[GreenKeys] ITTY meets RTTY

[Jeffrey D Angus]

On 2/22/2015 1:11 PM, Jack wrote:
>
> I built the Irv Hoff XT-4 crystal oscillator several years ago
> because I had the parts. It uses a single 6U8A vacuum tube
> as an oscillator and includes the “Mainline” FSK circuit.
>
Don't feel bad. I recently built a clone of the Hallicrafters HA-5 VFO.
Much more fun than building one of the solid state processor controlled
DDS VFOs.


-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com

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