[Elecraft] K3 RX Antenna Input RF

[.k8dd.]

Jim Cary wrote:
> I seem to be getting too much RF in on my Beverage on 160 when I am  
> transmitting, which appears to be causing the K3 RX antenna switching  
> relay to chatter along with my dots and dashes.  No problem on 80 when  
> using my beverage even though both the TX and RX antennas are the same  
> for both bands.  I didn't have this problem with my other rigs, but I  
> think that is because they grounded the RX Antenna input when the  
> transceiver goes to transmit.  Apparently the K3 does not.
> 
> The bottom line I guess is that I need to either ground the RX Antenna  
> input, or lift it, when the K3 goes to transmit.  Does anyone have a  
> simple circuit that I could use to key a relay off of one of the  
> accessory connector pins?
> 
> Thanks
> 
> Jim
> W2SM
> 
> JimLCary at gmail.com


How about putting a couple of 1N34 diodes from the beverage antenna to 
ground.  And maybe a night light bulb (not LED) in series with the 
beverage feedline.

Beverage ---- bulb _________ RX IN
                     |    |
                    ---- ----
             1N34    \/   /\
                    ---- ----
                     |     |
                     |_____|
                        |
                        |
                      ground

73    Hank    K8DD