I bought a 544 without the filter, WTB postings yielded nothing, of course
Ten-Tec no longer sells the filter. Fortunately, owned a 540 with a 245
installed, so cloned the filter. It isn't very complex, just a couple of
dual op amps. Parts cost a total of about $15, had a pcb made by tracing
the lands from the 245 on-hand, unfortunately the holes for the pins used to
plug the board ended up being a little off. Still, I was able to make
everything fit and now the 544 has a working filter too. Vector board with
point-to-point wiring would probably work as well.
I got a pdf from somewhere of the circuit but it is on my other computer
about 60 miles from here. Will send it to you after the holiday.
73 Curt, KB5JO
----- Original Message -----
From: "Marty Hartwell" <mhartwe@gmail.com>
To: "Ten Tec" <tentec@contesting.com>
Sent: Tuesday, June 29, 2010 3:03 PM
Subject: [TenTec] 540 Triton model 245 cw filter
Hi
In a trade recently I acquired a TT540 with out the model 245 CW
filter. I think
those are maybe somewhat hard to find these days but thought I might ask
here if
anyone has one for sale.
Another thought crossed my mind also, I believe the Argonaut 509
used the same
filter in an external plug in accessory and was wondering if someone may
have a circuit
drawing for that available that I might have a copy of, any costs
reimbursted. It would be
real convenient if it could be sent via email too.
Along that same line anyone know if Ten Tec may have a copy of
that
model 245
CW filter I could down load. I looked last night for a little while and
had
no luck I may
try calling them yet today and ask.
Marty kd8bj
--
Marty Hartwell
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