Topband: Common Mode RF Currents Disrupting JT Transmissions

Paul Kiesel k7cw at yahoo.com
Fri Feb 17 14:40:59 EST 2017


Hello -

I'm not able to run more than 150 watts when using JT65 on 160. RF gets into the computer and disrupts the JT signal. I don't have this problem on 6m where I run QRO using JT65 on EME. I installed ferrite beads on all radio and computer leads, with multiple beads on coax cables. My antenna is an inverted-L hanging from a big douglas fir, and it's about 150 feet from the shack. The feed coax is RG-218 (same as RG-17), so there was no opportunity to coil it into a choke at both ends. Should I be more aggressive with the ferrites?

Respond directly, please. Thanks.

73, Paul K7CW


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