[Elecraft] K3 ANT1 / ANT2 switching

[William Lagerberg]

Hi there Tim,

I have the same problem, I did some thinks at the back site changing the 2 meter antenna, I think I touch the 12 volt power supple and then the K3 went to the same as you describe. When I press the ANT button with the AUTO ATU in Bypass, there's a click, and the annunciation changes from ANT1 to ANT2, but I can still hear signals just as loud, even though there a dummy load on ANT2. Also If I transmit, it doesn't matter whether I have ANT1 or ANT2 selected, RF always comes out of ANT1 socket. If I have the ATU activated, the symptoms are exactly the same.  What was your solution ??  I think it's in the software, but where as far as I know it only went of.. and I turned it on again which I doe every day.

Regards William

========================
PE1BSB @ zendamateur.nu
Stommeerkade 65
1431EL  Aalsmeer
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-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Tim Raven via Elecraft
Sent: Saturday, 10 July 2021 13:37
To: elecraft at mailman.qth.net
Subject: [Elecraft] K3 ANT1 / ANT2 switching

Hi, 

 

I have acquired a second-hand K3/100 with the Auto ATU and 2nd receiver, which I have been checking out, calibrating and installing extra filters.
Everything has worked exactly as expected, until I tried to use an antenna connected to ANT2 socket. 

 

I have a fan dipole connected to ANT1, and a 50 Ohm dummy load to ANT2. When I press the ANT button with the AUTO ATU in Bypass, there's a click, and the annunciation changes from ANT1 to ANT2, but I can still hear signals just as loud, even though there a dummy load on ANT2. Also If I transmit, it doesn't matter whether I have ANT1 or ANT2 selected, RF always comes out of ANT1 socket. If I have the ATU activated, the symptoms are exactly the same,
except when I switch from ANT1 to ANT2 there's no click.   

 

The Auto ATU works fine, and I have the KRX3 "ANT=bnc" set. 

 

I can also hear stations on the 2nd receiver through the  ANT1 socket or via AUX antenna socket. 

 

The firmware has been updated to the latest versions for MCU, FPF, and both DSP units.

 

Any help would be most welcome.

 

73 de Tim G4ARI 

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