Fred (FL) wrote:
Did anything ever become of the idea of "INRAD will be
soon making custom RX filters for the K2"?
I saw this concluding remark, in an article on
Elecraft site, about K2.
Maybe it was a rumor, wishful thinking, or
didn't make sense to INRAD.
INRAD did make a few 400Hz CW filters for evaluation purposes. I have
one -- but not in my K2!
The filter had great characteristics when measured on stand-alone
equipment. But I (and others) didn't succeed in installing it in the K2
without there being too much leakage around the filter.
I tried using a cut-down ssb board to switch it in and out. Way too much
leakage, so then I simply connected it to the headers used for the ssb
board. I even made little hoods for the coax jumpers to eliminate that
leakage path. Not good enough. And of course, without switching it was
only possible to have one bandwidth (although I did set it up for
discrete passband tuning).
The problem was likely due to grounding issues. I did try various things
suggested by Wayne, Eric and George, W2JVN (who was the owner of INRAD
at the time), but I could not get good enough ultimate rejection to make
it worthwhile.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
_______________________________________________
Elecraft mailing list
Post to: [email protected]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com
