Diversity receive is fantastic

[Leroy]

    All of the RADAR and beacon systems I worked on before I retired from the FAA

used diversity receive. I could see the video clean itself up , but it was a subtle.

  I did not expect the diversity receive to work excellent like it does on my K3S.

I was a little hesitant to get the SUB receiver, I was not sure the advantage was worth it.

What a mistake that would have been!

   Here is a firmware request for the DIV button:

Could it auto tune the Subreceiver to your  operating frequency when you turn on the Diversity ?

That would be so cool. It might already be able to do that, I just have not discovered it yet.

Leroy AB7CE
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[Guy Olinger K2AV]

Hi Leroy,

When you place the rig in diversity, both receivers run directly off
the main (VFO A) synthesizer, period. If you are in diversity and TX
on your RX frequency, VFO B is not being used for anything.

VFO B remains independent so that such as split operation is possible.
Having VFO B hard reset to the VFO A frequency going into diversity
would blow up many common operating procedures.

Operating diversity, or not, listening to an up 2 frequency for a TX
operating spot can be necessary. In split mode with diversity on, a
double tap to the SUB button has me listening to the TX frequency in
the right ear, and a hold on the SUB puts me back in diversity,
**without losing my TX frequency** on VFO B.

It is possible to get K3 diversity to the audiophile's "sound stage"
level, where the band noise spreads all around the audio "horizon" and
CW signals come from point sources. Has mostly to do with the various
RF, AF, PRE, AGC settings, and using RX antennas with deliberate
varying patterns. When the pileup or weak-signal-plus-noise is spread
around the sound stage, diversity is really neat, and amazingly
helpful.

That is at the point where you have fed enough and proper information
to the headphones for your brain to separate everything out like a
conversation in a noisy crowded room. This is not the same thing as
diversity for the sake of not having both channels fade out at the
same time.

If one has not experienced a pileup on a K3 diversity sound stage, you
haven't yet experienced what it can do.

73, Guy K2AV

On Sun, Jul 3, 2016 at 12:17 PM, lmarion <[hidden email]> wrote:

>     All of the RADAR and beacon systems I worked on before I retired from the FAA
>
> used diversity receive. I could see the video clean itself up , but it was a subtle.
>
>   I did not expect the diversity receive to work excellent like it does on my K3S.
>
> I was a little hesitant to get the SUB receiver, I was not sure the advantage was worth it.
>
> What a mistake that would have been!
>
>    Here is a firmware request for the DIV button:
>
> Could it auto tune the Subreceiver to your  operating frequency when you turn on the Diversity ?
>
> That would be so cool. It might already be able to do that, I just have not discovered it yet.
>
> Leroy AB7CE
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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[Edward R Cole]

Seems a solution looking for a problem.  In diversity both Rx are
slaved to VFO-A.

I use diversity on 2m eme to receive two polarities simultaneously
and can select Rx frequency up to +/- 45 KHz of the setting of
VFO-A.  To transmit on the selected Rx frequency I operate split Tx
using VFO-B.  Tying the Tx to the Rx would defeat my use of diversity
mode in the K3.

The sw used is MAP65 which automatically peaks the signal to optimum
polarity and displays the polarity angle (using JT65B mode).  With my
K3+DEMI dual Rx transverter+antenna array+8877 PA there is probably a
$5K investment which would be rendered null and void with tying the
Tx to VFO-A (so please don't).

73, Ed - KL7UW
http://www.kl7uw.com
     "Kits made by KL7UW"
Dubus Mag business:
     [hidden email]

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[Don Wilhelm]

Leroy,

I believe the "change" you request is already available, it just takes
some understanding of the difference between Diversity mode and the
subRX in non-diversity.

When the K3/K3S is in diversity mode, the operation is just like a
single receiver - both the main and subRX work from VFO A, except that
you hear the subRX in one ear and the main in the other.
If you have antennas that are compatible with diversity receive (such as
one vertical one the other horizontally polarized), then you will have
full diversity when you select the AUX antenna for the subRX.

So, when you select DIV, both receivers will be listening to the same
frequency - that is already the norm.

Much of what you request can be answered by a study of the antenna
configuration diagrams in the manual.  I believe what you want to
achieve is already present.

If instead you meant "operating frequency" to mean your transmit
frequency in split mode, then you do not want diversity receive, you
want the SUB turned on in normal mode.  The subRX will listen to the
frequency on VFO B (monitoring the pileup in most cases). When you go to
SPLIT, the subRX will listen to your proposed transmit frequency on VFO
B the main RX will listen to the DX on VFO A.

With the subRX installed, you have an option of not going into split at
all, set VFO B to the DX station, and tune the pileup with VFO A.  
Transmit will be on the VFO A frequency (without SPLIT).

I hope this clarifies the situation for you.

73,
Don W3FPR

On 7/3/2016 12:17 PM, lmarion wrote:

>      All of the RADAR and beacon systems I worked on before I retired from the FAA
>
> used diversity receive. I could see the video clean itself up , but it was a subtle.
>
>    I did not expect the diversity receive to work excellent like it does on my K3S.
>
> I was a little hesitant to get the SUB receiver, I was not sure the advantage was worth it.
>
> What a mistake that would have been!
>
>     Here is a firmware request for the DIV button:
>
> Could it auto tune the Subreceiver to your  operating frequency when you turn on the Diversity ?
>
> That would be so cool. It might already be able to do that, I just have not discovered it yet.
>
>

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