Don, <<By the way, this is an odd and awkward way to add a sub receiver to the K3.>> If you use an Icom 756 Pro to do the listening, it's also an "odd and awkward" way to add a bandscope to a K3. I did this in CQP and it works fine (thanks to W0YK for the tip a few years ago). 73, andy, ae6y ----- Original Message ----- From: "Don Nelson" <n...@comcast.net> To: "Ken K3IU" <kenk...@cox.net> Cc: "Elecraft Reflector" <elecraft@mailman.qth.net> Sent: Tuesday, October 13, 2009 10:27 AM Subject: Re: [Elecraft] IF Output Buffer Gain Mod
> Ken K3IU wrote: >> G'morning: >> >> Tomorrow I am going to make this mod on the K3 of a friend. To try to >> see what difference it makes, I though I'd look at the IF signal on a >> scope before and after. I have looked at the output on a modified K3 >> (mine) and it looks like about 2.5 mV (P-P). >> >> Does that look about the right order of magnitude??? >> >> Thanks... >> >> Ken K3IU >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:Elecraft@mailman.qth.net >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> >> > Ken, > > I have already made this modification to my K3. But I have not tested > it. So your email triggered a curiosity to check it. Since the test gear > is in the basement and the K3 is here in the shack, I thought of > connecting my FT817 and listening to the IF output. The IF center > frequency is 8.215 MHz more or less and so you can listen above the IF > and below the IF to what stations are transmitting. The FT817 was chosen > because it is highly portable and tunes to 8.215 MHz easily. You could > do an A/B test on signal level. There were a lot of signals on 20m and > so I had a lot to hear. If you put the K3 on say 14.350 MHz, for > example, then a signal at 14.325 MHz is going to be 25 KHz above the > 8.215 MHz IF or 8.240 MHz out of the IF output. This is because the IF > signal is inverted and goes up in frequency as you go down, in this case > down from14.350 MHz. The signals are going to be LSB for the same > reason. You could tune for WWV at 10 MHz to have a stable signal for the > before/after test. > > By the way, this is an odd and awkward way to add a sub receiver to the > K3. > > Don, N0YE > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
