[GCARC] Fwd: Need some antenna help

[Lou Bonaventura]

Forgot to cc the group on my reply to Al.

Lou


N2JXG
Savannah, TN / Sewell, NJ
/Ask for my current QTH when we make contact!/

TN Grid Square: EM55
NJ Grid Square: FM29

*Wires-X:* 144.975 Simplex

/All nodes below are public./

Stationary Node/Room (NJ): 74903 / 84903 / N2JXG-ND

Mobile Node/Room: 74933 / 84933 / N2JXG-RV

Portable Node/Room : 74903 / 84903 / N2JXG-FT3D



-------- Forwarded Message --------
Subject: 	Re: [GCARC] Need some antenna help
Date: 	Sat, 19 Mar 2022 23:50:26 -0400
From: 	Lou Bonaventura <n2jxg at lbon.net>
To: 	Al KB2AYU <kb2ayu at comcast.net>
CC: 	n2jxg at lbon.net



Great, thank you for the reply!

I kind of figured that; my main concern is not damaging the radios.

I can't talk on more than one at a time anyway, but also can't afford to 
keep replacing them either.

I have tried it on 10w and no difference. The only time it was ok was 
when I was using the HT as the PDN on 5w and there was no interference 
that I remember.

I appreciate it and 73!

Lou


N2JXG
Savannah, TN / Sewell, NJ
/Ask for my current QTH when we make contact!/

TN Grid Square: EM55
NJ Grid Square: FM29

*Wires-X:* 144.975 Simplex

/All nodes below are public./

Stationary Node/Room (NJ): 74903 / 84903 / N2JXG-ND

Mobile Node/Room: 74933 / 84933 / N2JXG-RV

Portable Node/Room : 74903 / 84903 / N2JXG-FT3D

On 3/19/2022 9:42 PM, Al KB2AYU wrote:
> 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
>>
>>
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