Ken;
I believe there are 4 crystals on what appears to be the standard filter
board. The 217 is on the AF/IF board and is switch selectable. This is
getting the output from the RX mixer which is then fed into the IF/AF
board and the receive filter if selected. The 8122 filter is also the
input to the TX mixer. Interestingly, on the board picture in the
manual, the filter is numbered as a 8117. Serial no. is 00042 so things
change.
John / WA1JG
Ken Brown wrote:
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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