Well, I finished up the assembly Part 2, and everything seems to be going perfect except for the very last step - the 40M bandpass filter alignment. All of the checks were in the expected range, except for U6 pin 8, which was 36.8 ohms instead of greater than 100 ohms. Everything else works perfect. I think the receiver itself is working perfectly, because I am able to hear several stations with no antenna connected at all; when I try that with my FT 817 and my Argonaut 509, I couldn't pick up anything without an antenna attached. On the other hand, with my antenna attached, I'm picking up lots of stuff with either the FT-817 or the Argonaut, and almost nothing additional, when attached to the K2. I assume the receiver for 40M is supposed to be fully functional at this stage. However, I seem to be having very severe attenuation between the antenna input and the receiver itself. So while the receiver seems to be nearly "deaf" I think the problem is in the path from the antenna jack to the receiver, not the receiver proper.
Unfortunately, just before performing the 40M band pass filter adjustment, my Pug started choking on something, so I jumped up to see, and naturally the headphone cord was wrapped around my leg so I yanked the K2 off the table onto the floor... I could kick myself! I redid the checks, and it all seems to be the same, so I don't think I broke anything new, I suspect my problem is something that already existed. L34 seemed to perform as expected, a very mild peak, near the top of the can... the L1/L2 peaking seemed to work, I could definitely make the signal come and go, with the antenna attached.... there is a very mild improvement when the antenna is attached, but as I noted, the signal is quite severely degraded, compared to attaching the antenna to one of my other two qrp radios... I did check my toroids for continuity from the pads, not touching the lead wire, to be sure that the wires had good connections to the solder, so....its now on to the signal tracing, a new experience for me. If the answer is obvious to anyone, let me know! Thanks. _______________________________________________ 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
