[Elecraft] K3S receive antenna

[Guy Olinger K2AV]

 If one is not contemplating 2 meters, there is a way to listen on both
ANT1 and ANT2.

The antenna tuner has a miniature TMP jack for the "other" ant. If you have
selected ANT1 with the ANT button then the ANT2 SO239 is connected to the
"other" jack. If you have selected ANT2 with the ANT button then the ANT1
SO239 is connected to the "other" jack. The "other" jack is RF protected
with circuitry on the antenna tuner board. The problem with using it with
no further work, is that you have to "trade" another input path for it. But
there is a mechanically simple way to work around that without using any
soldering irons or cutting anything.

On my K3 I installed the fan panel for the 2 meter option, which has the
ANT3 marked hole for a BNC. Then I installed a cable, TMP male on one end
with BNC chassis female on the other. I ran the cable from the antenna
tuner's "other" jack to the ANT3 marked hole. This brings the "other" jack
on the antenna tuner out to the back plane on a BNC jack. The plate with
the ANT3 BNC mounting hole and TMP male to female BNC chassis core are both
available as parts from Elecraft.

Once you've done that, you can use a BNC jumper to (A) go from ANT3 BNC
jack to either RX ANT IN BNC jack for use by the main RX or (B) the AUX RF
BNC jack for use by the subRX. With the (A) connection, a tap on the RX ANT
button switches the main RX between the main TX ant and whatever is on the
"other" antenna. With the (B) connection a long tap on the RX ANT button
switches the subRX between the main TX ant and whatever is on the "other"
antenna. Using in one connection does not prevent you from simply changing
it as the need arises.

I have used that arrangement to listen in diversity to both sides of a 90
degree X oriented pair of dipoles connected to ANT1 and ANT2. It works for
other antennas as well. In that arrangement, the left ear is always on the
transmitting antenna. If you hear it better on the right ear, you have to
tap the ANT button to move it to the left ear, and then you will be
transmitting on the antenna you heard the station best.

For 160m fixed RX antennas and diversity, a 6x2 RX antenna switch will
allow any combination of antennas in diversity RX with the "other"/ANT3
mod. Cable the  AUX RF and RX ANT IN to the x2 jacks on the switch. Cable
RX ANT OUT and ANT3 to two of the 6x side of the switch. Cable other RX
antennas to remaining jacks on the 6x side of the switch.

Once the "other" to ANT3 connection is made, all the above can be done,
other arrangements invented, swapped in and out without any further mod to
the K3/K3S.

If it were me, I would supply the K3S already wired that way. Then to add
the KXV144 just move the TMP end of the cable from the tuner to the xverter.

73, Guy K2AV

On Sat, May 21, 2016 at 6:31 PM, Cady, Fred <fcady at montana.edu> wrote:

> The main receiver can listen on the transmit antenna selected by the ATU
> or the separate receiver antenna input.
> The sub-receiver can listen on the same antenna as the main receiver or
> the other antenna on the ATU or the separate AUX antenna input (requires a
> connection change in the K3S).
> Cheers,
> Fred KE7X
>
> For all KE7X Elecraft books, see www.ke7x.com
> (PS:  A KX2 book is coming)
>
> ________________________________________
> From: Elecraft <elecraft-bounces at mailman.qth.net> on behalf of lmarion <
> lmarion at mt.net>
> Sent: Saturday, May 21, 2016 3:17 PM
> To: Elecraft at mailman.qth.net
> Subject: [Elecraft] K3S receive antenna
>
> Can the K3S with antenna tuner installed receive on one antenna and
> transmit on another?
>
> Thanks Leroy
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