Posted by
The Smiths on
Jul 07, 2010; 6:23pm
URL: http://elecraft.85.s1.nabble.com/K3-Audio-routing-question-tp5257517p5266664.html
That's NOT the case. If anyone would actually try turning on the Mix feature that Lyle gave them access to via the utility terminal they would quickly discover for themselves that it DOES work, and it works VERY WELL. Especially when using a Beverage and Vertical antenna together. It can lower the noise ratio very effectively.
Furthermore if you have 2 antennas that are working perpendicular directions on the same phase the L-R mixer will help increase the signal strength. It does NOT always cancel out signals. It does NOT cause picket fencing either, and you do not need to offset your Freq. either.
For goodness sake people, try the thing, Stop making all these assumptions. Things on paper aren't always what they are when you apply them to practical situations. I'm sorry that Joe feels differently, and he's welcome to it, but this opinion is coming from someone that has not even bothered to try this feature out, because his theory on paper tells him otherwise.
As someone that has, and IS using this feature on the K3 (though the Elecraft utility terminal window !EEFF;) I can say with FACT that it DOES work, and it works well for SOME, not all, situations. Some times it's easier to just try something than letting others tell you something isn't going to work.. No matter how smart they are or how convincing their theory is (and yes, I am giving Joe credit for being an intelligent person).
Finally, I'll only ask that Joe doesn't make any more personal attacks on here because my views differ from his. This is a discussion with more than one opinion. I have 25 years of experience using Radio, doing design work, repairs, and I've been using Diversity mode with and without mixing for MANY years, regardless of what he thinks.
> Date: Wed, 7 Jul 2010 13:10:26 -0400
> From:
[hidden email]
> To:
[hidden email]
> Subject: Re: [Elecraft] K3 Audio routing question
>
> 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
>
>
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