As Pat implies, RF is a strange and nebulous thing. It sometimes seems as if 
it follows its own arbitrary rules but I suspect that more likely, things 
change that we just aren't aware of.

Recently, I started having RF in my audio on 60 meters. I had never had the 
problem before. A few days later, I checked it again and the RF was gone. As 
far as I know, nothing in the shack had changed. I can only guess that it 
was something outside that had changed like ground water or weather 
conditions or something else but when you can't pin it down it sure makes 
problems harder to solve. I think we can all identify with what Tom is going 
through. Lou  WA3MIX
Lou Kolb
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www.loukolb.com
----- Original Message ----- 
From: "Pat Byrne" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Sunday, February 21, 2016 11:26 AM
Subject: Re: RFI Update


> The part that puzzles me Bob is that this is a new occurence.  So,
> something must have changed.  Chasing RFI is a wonderful thing!
> Pat, K9JAUAt 11:14 PM 2/20/2016, you wrote:
>>Tom,
>>
>>That means that RF is coming down your coax lines from your antennas,
>>and that you have a long ground wire which will radiate that Rf.  You
>>also could be having a ground loop between your electrical and RF ground
>>rod.
>>
>>I would try a coax RF choke at each antenna and or connecting a second
>>ground wire that is a few feet longer which should lower your RF ground
>>reactance.
>>
>>Bob, K8LR, [log in to unmask]
>>
>>On 2/20/2016 11:41 PM, Tom Behler wrote:
>> > Bob:
>> >
>> > I tried this on several bands (namely 40 and 160 meters), with an 
>> > output
>> > power of 100 watts, and no RFI was noticed.
>> >
>> > I can't try the dummy load with my ALS600, because my dummy load only
>> > handles 300 watts.
>> >
>> > I think this is telling me that I am getting some sort of RF coming 
>> > back
>> > down through my antenna systems.
>> >
>> > Tom Behler: KB8TYJ
>> >