RX Ant Out?

[Jim AB3CV]

I can't figure out what RX Ant Out does. The K3s users manual is pretty
sparse in it's description.

It appears that the "normal" e.g. Ant1/2 is presented to RX Ant Out when
the RX antenna is selected.

If that is the case then could RX Ant Out be fed to Aux In?

That would make the TX Ant the Aux antenna and would allow for diversity
using this on the Sub RX while RX Ant is going to the Main RX.

Am I missing something? (probably...)

jim ab3cv
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[w8fn]

When the RX ANT function is engaged, the normal internal connection
between the Receiver side of the K3's T/R switch and the Receiver input
is broken. The output from the T/R switch is routed to the RX Ant Out
jack. The RX Ant In jack connects to the Receiver input. This allows you
to insert a preamp, filter, etc. in the receive line between the antenna
and the Receiver input. This function is extremely useful. In addition
to allowing the insertion of filters, etc. you can also feed the
Receiver input from an external switching unit to select one of several
different receive antennas without disturbing the transmit path. One of
the inputs can of course be the transmit antenna signal from the RX Ant
Out jack. I use this function extensively to switch between different
receive antennas, especially for low band reception. I have actually
built a switch matrix that allows me to put any of three receive antenna
sources to either the Main receiver input via the RX Ant In jack or the
Sub receiver input via the AUX RF connector, with suitable lockout
logic. This setup is extremely valuable for Diversity reception.

73...
Randy, W8FN

On 7/12/2016 9:02 PM, Jim Miller wrote:

> I can't figure out what RX Ant Out does. The K3s users manual is pretty
> sparse in it's description.
>
> It appears that the "normal" e.g. Ant1/2 is presented to RX Ant Out when
> the RX antenna is selected.
>
> If that is the case then could RX Ant Out be fed to Aux In?
>
> That would make the TX Ant the Aux antenna and would allow for diversity
> using this on the Sub RX while RX Ant is going to the Main RX.
>
> Am I missing something? (probably...)
>
> jim ab3cv
> ______________________________________________________________
> 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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[Elecraft mailing list]

Jim,
You are so right about the K3(S) manual!  Elecraft pretty much leaves it up to your imagination on just how to use it the RX Out BNC connector???? 
I found a good use for the RX Out to be where you have a separate receive antenna (Beverage, HI Z 8, SAL, etc.), and plan on using diversity receive (requires the sub receiver).  What you do is connect a short piece of 52 ohm cable with BNC males on each end between the RX Ant Out BNC,  and the AUX RF In BNC.   With the configuration, a push of the RX Antenna button routes one antenna to the Sub Receiver, and the other antenna to the Main Receiver!
Dick, K8ZTT
      From: Jim Miller <[hidden email]>
 To: Elecraft Reflector <[hidden email]>
 Sent: Tuesday, July 12, 2016 8:02 PM
 Subject: [Elecraft] RX Ant Out?
   
I can't figure out what RX Ant Out does. The K3s users manual is pretty
sparse in it's description.

It appears that the "normal" e.g. Ant1/2 is presented to RX Ant Out when
the RX antenna is selected.

If that is the case then could RX Ant Out be fed to Aux In?

That would make the TX Ant the Aux antenna and would allow for diversity
using this on the Sub RX while RX Ant is going to the Main RX.

Am I missing something? (probably...)

jim ab3cv
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[Jim Miller]

Thanks all. You've given me good ideas.

73

Jim ab3cv

On Jul 12, 2016, at 10:02 PM, Jim Miller <[hidden email]> wrote:

I can't figure out what RX Ant Out does. The K3s users manual is pretty sparse in it's description.

It appears that the "normal" e.g. Ant1/2 is presented to RX Ant Out when the RX antenna is selected.

If that is the case then could RX Ant Out be fed to Aux In?

That would make the TX Ant the Aux antenna and would allow for diversity using this on the Sub RX while RX Ant is going to the Main RX.

Am I missing something? (probably...)

jim ab3cv
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