I recently completed my K2 and everything seemed to work OK. All tests are ok with exception of a slightly low 8V regulator output (7.59V).
The sensitivity seems low however (my KX1 is much better at this point). Tracing the receiver revealed that sensitivity is top notch at certain points. This is where it gets weird... When I inject a signal on the north side (according to schematic) of C7 (40m), C15 (80M), C24 (20M) and the same on all other bands, the sensitivity is great. But when I inject the signal on the other side of these capacitors (pin 8 on the relays), the level drops (at least 20db) to the same as what it is at antenna, W6, W1,D2/D3, D3/D4 and all other points along the signal path. I removed W6 and RFC7 to isolate the problem and to see if anything in the T-R switch or Low Pass filters could pull the signal down but there is no change. I still only hear a weak signal when I inject a signal at pin7 or 8 on the respective relays. But as soon as I touch either side of C6 for 40m, L7 for 80m, C22 for 20m etc, it is as strong as it should be. I have measured all the relays for potential shorts but they seem to be fine. Any ideas out there? 73, Are - LB3SA -- View this message in context: http://www.nabble.com/K2---signal-loss-in-band-pass-filter-tp17294418p17294418.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
