[Elecraft] K4 RX antenna ports

[hwhite1 at maine.rr.com]

Good morning Wayne,

You mention, "(if a KAT4 is installed: ANT 1/2/3). So the KAT 4 is not
included in a K4?

On your K4 page, under "Specs", "Standard Features", you list "KAT4 ATU:
10:1+ range; 3 ant. Jacks".

Your photos all seem to show the KAT 4 installed with no disclaimer about
any accessories being included in the image.

Which is it, included in the K4 or not? BTW, there is at least one other
place in the K4 page that indicates the KAT 4 is included in the K4.

Also, is it true that the K4 has just one receiver?

73,

Harry K1RSA

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Wayne Burdick
Sent: Tuesday, May 28, 2019 11:54 PM
To: Elecraft-K4 at groups.io
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] K4 RX antenna ports

> n6wg <n6wg at comcast.net> wrote:
> 
> There are 5 rx ant ports on the K4, 3 UHF and 2 BNC.  I've seen no mention
of how they are to be selected though.  In my imagination, I see pressing
the RX ANT button putting a list of up to 5 antennas on the screen.


This is pretty close, Bob. There are actually four antenna controls on the
K4:

   ANT (tap)        Selects the transmit antenna (if a KAT4 is installed:
ANT 1/2/3)
   REM ANT (hold)   Might be used to control a remote antenna switch,
rotator, etc. (future)

   RX ANT (tap)     Selects the main RX antenna (default: TX ANT)
   SUB ANT (hold)   Selects the sub RX antenna (default: TX ANT)

When you tap RX ANT or hold SUB ANT, you'll get a pick list of all available
antennas for that receiver. In the case of the K4D or K4HD, you can make
independent selections for these, because they both include the diversity
option module (with a second ADC, second set of band-pass filters, and
separate set of of RX antenna relays).

The default antenna for both receivers is the selected transmit antenna.
This means the signal goes through the KAT4 ATU and its antenna switch (ANT
1, 2, 3).

The other possible receive antenna choices are:

   RX ANT 1
   RX ANT 2 (which doubles as XVTR IN)
   Either of the two KAT4 *non-transmit* antennas 

ANT 4 is reserved for use with the future VHF/UHF module. The connector
could be UHF or N.

73,
Wayne
N6KR
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