[Milsurplus] BC-221 Testing Results

[J. Forster]

I recently got a new toy, a BC-221-AK  with the A-133 AC supply and have
been testing it with modern test gear. Actually, it is suprrisingly good.

Both bands work and put out a couple of volts of RF when measured on a
'scope with a 10X probe connected to the antenna leads.

 The lower band is  an asymmetric pulse waveform, about 25% low and 75%
high. The waveform is not atall clean, but looks like it was drawn by a
drunk with palsey. The upper band is not a bad sine wave.

When checked in the frequency domain, using the FFT on the 'scope, the
lower band has a lovely comb, extending to well over 3 MHz; the upper band
is also a comb, but with fewer lines, extending to over 20 MHz.

If I put the unit in CHECK mode and zero beat against the internal crystal
at 3000, 6000, 12000 kHz, I get 2.99999 Hz on the counter. IMO that's
pretty good after nearly 70 years.

Best,

-John

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