[ARC5] [armyradios] BC-221 Testing Results

[Jay Coward]

 The output should not be a pure sine wave but should be rich in hamonics. Even though the LM's and BC-221's have adjustments I've never found it nessessary to try to improve performance.
 Another surprise to me was the TS-1 oscillator used with the AN/ARR-1 Homing adapter. This is a cavity tuned unit set to 245 MHz. It was off by 30 Hz as measured with an Agilent spectrum analyzer.
 Jay 
 



-----Original Message-----
From: J. Forster <jfor at quikus.com>
To: ARC5 <ARC5 at mailman.QTH.net>; ArmyRadios <ArmyRadios at yahoogroups.com>; Milsurplus <Milsurplus at mailman.QTH.net>; VMARS <VMARS at yahoogroups.com>
Sent: Fri, Nov 23, 2012 4:32 pm
Subject: [armyradios] BC-221 Testing Results


 

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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