[Elecraft] 80m KPA1500 High reflected power problems **SOLVED!**

[Jim Brown]

On 3/10/2019 10:33 PM, Peter Dougherty wrote:
> I have a 30 foot vertical ground-plane style antenna that I use for diversity RX on 40 and 80, which was connected to the AUX antenna port. This was being overloaded by the QRO power from the TX antenna feedpoints just a few feet laterally and 40-50' higher vertically. As soon as I disconnected this antenna the problem went away.

Hi Peter,

It sounds to me like your station (and maybe your home) is not properly 
bonded. All of your feedlines SHOULD be bonded to a common ground at 
lightning arrestors where they enter your shack, all the equipment in 
your shack SHOULD be bonded together and to all of the grounds in your 
home including that one, power, telco, CATV, and satellite. If you've 
done this, disconnecting one of the antennas from your rig should not 
change anything on the transmit side -- the only change should be 
overload of the second RX by that antenna.

Two good references on grounding and bonding. One is N0AX's recent ARRL 
book on the topic. The second is the set of slides for talks I've done 
at Pacificon and Visalia on the topic.

http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC