On 1/20/2014 6:55 AM, Neil Martinsen-Burrell wrote:
2) I am primarily interested in CW with this radio and so I am looking for
a narrower audio filter. I have seen a Model 208 CW audio filter for sale,
but it is set up for use with the accessory jack on the Argonaut 509. The
TenTec wiki says "a slight modification is necessary when using the filter
with the older Model 505 Argonaut. Service Note SN-6-505 details the
modifications." I assume that the slight modification is to separate out
the audio in, audio out and power in lines. Does anyone know how to obtain
a copy of that service note for more details?
I don't know about the 505, but the 509 was occasionally modded by
replacing the 4 pole crystal filter with an 8 pole one from a Triton
IV. I think the IF sections are similar enough to do it, but I would
check with someone who did before you do.
My 509 had the S/SWR meter bulb go, so I replaced it with an LED bulb. I
was going to replace the dial light bulbs with LEDs, but so far they
still work. I think they were rated at a higher voltage than they are
used at, so they won't burn out quickly. The S/SWR meter bulb can be
reached from the top, the dial light bulbs require you to pull the front
cover. Something I did to restring the dial, but hope not to do again
for a long time.
You can see my 509 station if you look me up under my Israeli call on
QRZ. :-)
Geoff.
--
Geoffrey S. Mendelson 4X1GM/N3OWJ
Jerusalem Israel.
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