Posted by
Richard Ferch on
Jul 07, 2010; 5:10pm
URL: http://elecraft.85.s1.nabble.com/K3-Audio-routing-question-tp5257517p5266298.html
I think it is finally beginning to sink in here. Yes DIVRSTY mode would be
one way to lock both receive VFOs together, with the transmit VFO on a
separate frequency. (Another way would be to LINK the two VFOs and use
RIT.) I can now see why you might want to use DIVRSTY mode even for
non-diversity receive.
As Joe described, you can use CONFIG:L-MIX-R to mix both receivers into
both ears in dual receive, but not in DIVRSTY mode, and you can then use
the BALANCE control to adjust the relative strengths of the two receivers.
Before doing this in the heat of battle, though, you might want to
experiment with it with the receivers LINKed and on the same frequency.
Others have already pointed out that there will be "picket-fencing" in the
frequency response, and you can actually see this for yourself.
With both receivers having matched roofing filters and both tuned to the
same frequency and LINKed, using a single antenna, I observe a fairly
pronounced "picket-fence" effect in the audio response as I tune past a
carrier. In fact, I can hear notches in the band noise as well as in
signal strengths as I tune up and down the band. This suggests to me that
L-MIX-R would only be useful when the two receive VFOs are tuned to
different frequencies. The frequencies must differ by at least a few 10s
of Hz - if they are only a few Hz apart, I hear a very annoying, more or
less rapid, beat or flutter in the audio. This, of course, only confirms
what has already been pointed out (which is a consequence of the basic
physics of the situation), but just in case you want or need to see it for
yourself, you can easily give it a try...
73,
Rich VE3KI
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html