[GCARC] Need some antenna help

[Al KB2AYU]

The short answer is there is no way to have that much RF flying around 
with antennas that close together and not have problems.

I don't think it would damage the receivers, but it might, especially at 
50W.

Even at 10W it probably wouldn't make much difference, though you should 
try it just to see.

Any chance of making that work would require expensive filters or band 
pass cavities.

Al

On 3/18/2022 11:09 PM, Lou Bonaventura wrote:
> Hi all,
>
> I'm looking for the antenna gurus here hi hi.
>
> In my attic (yeah, HOA) I have (1) 2mtr vertical, (1) 2mtr/70cm 
> vertical, and (1) 6/2/70cm vertical antennas.
>
> The 2mtr is connected to a FTM-200D for Wires-X PDN (50w, on 144.975 
> MHz).
>
> The dual band is connected to a FTM-6000R (50w).
>
> The triband is connected to a 991A (50w).
>
> Whenever the PDN is active, the other radio's tx/rx is reduced to 
> practically nothing, even if the PDN is just receiving. I use my HT to 
> connect to the PDN, or my mobile in my Jeep when I'm not at the house.
>
> If I have the PDN in Direct Mode there is no issue, just when it's in 
> Access Point Mode.
>
> I'm pretty sure it's some type of antenna coupling, one feeding into 
> the others, but I'm not sure how to resolve it other than getting rid 
> of some radios, but I don't want to do that.
>
> The 2mtr Wires-X antenna is 10+ feet from the dual band and about 25 
> feet from the triband.
>
> The dual band is about 10+ feet from the triband.
>
> Yes they are all in a line from each other due to the roof peak in the 
> attic.
>
> The 991A has no interference on lower bands and that is on a tuner 
> connected to my outside gutters, so no problem there, but I'm sure 
> it's still feeding RF into the radio.
>
> Any thoughts on resolving this issue before I burn something up? I 
> don't like that it's feeding into the other radios.
>
> Thank you and 73!
> Lou
>
>