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[TowerTalk] PL-259 to N Female Adapter on a Comet GP-9 Antenna

Subject: [TowerTalk] PL-259 to N Female Adapter on a Comet GP-9 Antenna
Date: Mon, 19 May 2008 08:21:30 -0400
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I am trying to install a Comet GP-9 Antenna using LMR-400 Coax that has N Males 
on each end.? I bought the Antenna from a reputable local dealer.? I asked him 
for a Comet GP-9N, but, he did not have one in stock.? He told me it would be 
no problem to use a PL-259 to N Female Adapter, and he gave me one? to use? on 
the antenna. 

I? installed the adapter by tightening it firmly, and then firmly connected the 
LMR-400 cable.? When I tried to? waterproof the cable with coax seal, the 
adapter broke.? The PL-259 ring separated from the body.? I assumed I had 
tightened the adapter too tight.? I obtained another adapter, and tried again.? 
This time I carefully finger tightened the PL-259 ring.? I finger tightened the 
N Male, and started to wrap the coax seal.? The adapter broke again.? I figured 
out that it was due to the stiffness of the LMR-400.? The leverage of the stiff 
cable rips the adapter apart.? Doe anyone have any ideas for a fix?

The package brags that the GP-9 antenna is rated for 200 watts. As an 
omni-directional antenna, it is obviously aimed at FM Simplex and Repeater 
users.? However, the instruction sheet rates it at 200 watts SSB, not FM.? It 
was my impression that SSB ratings are about 4 times that of a AM or FM rating. 
I would then assume that a 200 watt SSB rating would give a maximum FM power 
rating of about 50 watts.? Am I correct in this assumption?

I asked the US Distributor that type of question via email.? Their reply email 
is below.? The only change I made in copying this email, was in my changing my 
email address to protect me against spam.


-----Original Message-----
From: MickStwernik <>
Sent: Tue, 13 May 2008 2:07 pm
Subject: Re: GP-9 Data Sheet

The FM rating of the GP-9 is 100W FM, 200W 


Depending on the duty cycle, 160W will probably 
damage the antenna.


Mick Stwertnik
NCG Company
15036 Sierra Bonita Lane
CA? 91710-8901

----- Original Message ----- 



Sent: 2008-05-12 07:27 PM

Subject: GP-9 Data Sheet

  is the FM Power Handling capability of the GP-9?? The data sheet says 200 
  Watts SSB, which is about 50 Watts FM power.?? I want to use the 
  antenna with a 160 Watt Mirage amplifier on FM Simplex at 146.58 Mhz.? Is 
  this wise, or will I be melting the antenna?

Noel Spears? 



  Plan your next roadtrip with America's #1 Mapping Site. 


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