Hi John,
My best guess is that a leading "4" is missing from that number and the
filter is really a 48122. That would fit into Ten-Tec's filter stock
number scheme. Based on the other stock numbers beginning with "481" I
would guess it is a 9 MHz filter.
If you get any more definitive information on that filter, please pass
it on to me, so I can improve my filter list. Could you tell me how many
crystals are in the filter?
Thanks,
DE N6KB
John Graves wrote:
> My Argosy has a 8122 filter on the RF/Mixer board and the expected 217
> on the IF/AF board. What is the 8122 and is that the stock filter? Is
> there a better choice given that I work both SSB and CW with the radio?
>
Ten-Tec IF filter data
Model Number / Stock Code / Bandwidth Hz / Center frequency MHz / Poles
Following the number of poles are other numbers that have been reported
seen on these filters. They may be date codes or PCB design numbers.
216 / 48161 / 500 / 9.002210 / 6 RTTY filter
217 / 48036 / 500 / 9.000750 / 8
218 / 48037 / 1800 / 9.001500 / 8
219 / 48055 / 250 / 9.000750 / 6 /8047 / 6840
??? / 48057 / ??? / ???? / 4 / 84-05
220 / 48058 / 2400 / 9.001500 / 8 /8307 / 6840
221 / 48243 / 250 / 9.000500 / 6 Low note CW filter
282 / 48054 / 250 / 6.299250 / 8
285 / 48053 / 500 / 6.299250 / 8
288 / 48075 / 1800 / 6.300000 / 8 / 9125 / N5
unk / 48127 / 6000 / 9 / ?
unk / 48074 / 2400 / 6.3 / Stock (non-option) 6.3 MHz filter>
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