Topband: Common Mode RF Currents Disrupting JT Transmissions

[Goldtr8 (KD8NNU)]

Read the information in the links from Jim Brown.  Once you understand what 
he is explaining, it becomes easier to fix.


http://audiosystemsgroup.com/RFI-Ham.pdf

http://audiosystemsgroup.com/NCDXACoaxChokesPPT.pdf



~73
Don
KD8NNU
2014 3905CC Top Gun :-)
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-----Original Message----- 
From: Paul Kiesel via Topband
Sent: Friday, February 17, 2017 2:40 PM
To: topband at contesting.com
Subject: Topband: Common Mode RF Currents Disrupting JT Transmissions

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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