[Elecraft] K4 RX antenna ports

[Jim Miller]

If/when implemented how would the REM ANT control communicate with the controlled device?

73

Jim ab3cv 

> On May 28, 2019, at 11:53 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
> 

> 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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