[RFI] Inter-station interference question.

Mike - W5JR w5jr.lists at gmail.com
Thu Nov 21 00:40:26 EST 2019

If any of the “RG214” is in fact a shield over foil braid, replace it with real RG214. As Jim mentions, passive intermod (PIM) usually rears its ugly head after installation of all the cool stuff. You will want to confirm that all of the components, radios, amplifiers, filters, feedlines, towers, guy systems, are *bonded* together to further reduce the possibility of PIM. 

PIM will be the biggest hurdle in making any multi transmitter situation play nice. Often the PIM generator is external to your feedline or antenna. It’s the “killjoy” of many a Field Day setup over here. 

Mike / W5JR
Alpharetta GA

> On Nov 20, 2019, at 11:52 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> Hi Martin,
> here's an "overview" talk that I've done at Visalia last spring and for a couple of clubs, including NCCC, this fall.
> http://k9yc.com/Multi-Station.pdf
> Among other things, check out the chokes in my newest Cookbook, which are significantly better and more repeatable designs than what I was able to do 10 years earlier.
> Also, consider passive intermod.
> 73, Jim K9YC
>> On 11/20/2019 8:22 PM, Martin Sole wrote:
>> Hi,
>> This is about a two radio inter-station interference problem. A bit different perhaps but still RFI of a sort
>> Looking for some input to help me understand a bit better what is happening and maybe correct some errors in my thinking.
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