[Elecraft] K3 RX antenna input protection circuits

I have a question about the receiver front end protection circuits in the K3 — specifically, the ones on the RX ANT IN and AUX RF inputs. When I went to the schematics, here's what I found: AUX RX feeds the KRX3 Sub Receiver board, where it goes to a gas discharge tube (SA1) shunted by 470K.

[Elecraft] K3 RX Antenna Input RF

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

Re: [Elecraft] K3 RX Antenna Input RF

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

Re: [Elecraft] K3 RX Antenna Input RF

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

[Elecraft] K3 RX antenna input

Hello All, Anyone know if the RX antenna input is shorted to ground when the K3 is put into TX mode ? I have been getting some funny stuff going on when I use my amp on 80m and beverage antenna. Thanks Jerry, KE9I __ Elecraft

Re: [Elecraft] K3 RX antenna input

K3 S/N 1732, I have added the mod for the RX ant input. Thanks Jerry, KE9I Gerard Jendraszkiewicz wrote: Hello All, Anyone know if the RX antenna input is shorted to ground when the K3 is put into TX mode ? I have been getting some funny stuff going on when I use my amp on 80m and

Re: [Elecraft] K3 RX antenna input

Jerry, If the funny stuff is hearing a clicking sound, that is the sound of the COR relay kicking in to protect the receiver. The only cure is better isolation for your receive antenna from the transmit antenna. 73, Don W3FPR Gerard Jendraszkiewicz wrote: Hello All, Anyone know if the RX

[Elecraft] K3 RX antenna input

W3FPR wrote: If the funny stuff is hearing a clicking sound, that is the sound of the COR relay kicking in to protect the receiver. The only cure is better isolation for your receive antenna from the transmit antenna. I use KD9SV's Dxpedition receive antenna switch to achieve the isolation