I had similar issues, and addressed them through a combination of feedline 
chokes and microphone input filtration. I found that the mic input seemed to by 
my biggest "entry point". I spoke to a number of people that couldn't use "pro" 
condenser mics for this reason.

I reduced the mic input problem through chokes, grounding and attention to 
potential "pin 1" problems. I do have to say that my 5K was the most 
RFI-sensitive modern transceiver I ever used.

Good luck,

Mike - N8MSA

Robert Costa <[email protected]> wrote:

>All,
> 
>As you may have seen from previous posts, that I have RF ingress issues on my 
>Flex 5000a restricting my use of the flex to 40 meters and below. As I want to 
>start addressing these issues, I would like to know what products others have 
>used. 
> 
>I need to eliminate common mode currents at the feedpoint of my 80-10 meter 
>dipole. I have seen Radio Works line isolators, but have been told that they 
>are not very effective. I have been told to use a W2DU current UNUN from a 
>company like the wireman.
> 
>I am open to suggestions as I do not want this to be an extended engineering 
>science fair. 
> 
>As this RF ingress issue has been a complete irritating experience with my 
>Flex, I would like to hear who has used what and what the results and over all 
>costs have been.
> 
>Thank you,
> 
>Robert 
>KB6QXM
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