I have a Model 220, 2400 hz, 8 pole I bought in 1983
for my Argosy and it is marked "8307" on top of one of
the crystals and "220" on another. The back of the
board has "6840" printed on it. The center frequency
is 9.00150 mHz.
I have a Model 219, 250 hz, 6 pole bought in 1983 for
my Argosy and it is marked "8047" with the same board
number. and 217, 500 hz 8 pole marked "48036". The
217's date of origin is unknown. I recently pruchased
the 217 online. The 219's center frequency is 9.000750
and I presume the 217 is also the same.
I have the 217 in the Argosy's RF-MIXER board in place
of the 220 and the 217 in the IF-AF board as the
"optional" filter. This is strictly a CW rig now.
Works great.
73,
Don, NN8B
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