Thanks Bob, yes the resistors are metal film or something like that but
definitely not wire wound. I spent a fair time on the air last night on
40/80 with the K1 and 100W from the TS520. It works like a charm. The K1
switches the TS520 T/R relays via a little 2 transistor switching circuit
(looking at the K1 6R line) which grounds the TS520 PTT line. I built the
circuit onto a small piece of vero board which plugs into the 3 pin socket
on the filter board (like the official K2 mod) . A screened cable then
connects the open collector to the PTT pin on the TS520 Mic socket.
I've set the T-R delay to about 500ms so the relays don't switch too much.
Do I need to worry about this? If I set it so that it switches say between
each word will that wear out the relays too quickly, not sure how robust
they are. When operating the K1 barefoot I use a T-R delay of 50ms.
Thanks
Martin
M0KWV
[EMAIL PROTECTED] on 13/01/2005 16:58:55
To: [EMAIL PROTECTED]
cc:
Subject: Re: [Elecraft] Elecraft: Amplifier for K1
Hi Martin,
Got that fine.
You have got the best of what is possible using the TS520 with the way you
have done the mod.
Just a point make sure you do not use 2 x100 ohm wire wound resistors for
the dummy load. They must be carbon otherwise odd effects can occur due to
inductance. You may be well aware of this effect, but I am pointing it out
in any case as 2.5W is one of the standard dissapation values for wire
wound resistors!
Regards,
Bob, G3VVT
Why not take a look at our Web site?
http://www.simoncarves.com
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