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[TowerTalk] PL259 Insertion Loss?

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Subject: [TowerTalk] PL259 Insertion Loss?
From: "Jim Thomson" <>
Date: Tue, 17 Jan 2012 00:18:05 -0800
List-post: <">>
Date: Mon, 16 Jan 2012 12:48:31 -0500
From: Frederick Vobbe <>
Subject: Re: [TowerTalk] PL259 Insertion Loss?

On 1/16/2012 12:24 PM, Steve Hunt wrote:
> Fred,
> If you had 0.3dB loss in a connector I doubt you or the guy at the other
> end would hear the difference. But if you ran 1.5kW through it you'd
> probably smell the difference!
> 100w is a lot of power to dissipate in such a small volume!
> 73,
> Steve G3TXQ

###  If they had .3 db loss... they would be on fire ! 

Never even considered running anything greater than 500 watts through a 
PL259, to be honest with you.   I know they are rated for higher power, 
but I've never considered them as being the right connector for the 


##  You can stuff 5 kw easily through a good quality silver/teflon PL-259 
5 kw is only 10A of RF.  It's also 500 vrms/707 v peak..but only into a 1:1 

##  sure amphenol makes a good connector..but only if u get their teflon silver 
and NOT their nickel plate junk.  

## peter mentions female SO-239's  on stuff like drake eq, lk-500's etc. That 
white stuff u see on drake
connector's  is NOT teflon, nor are they silver plated. 

##  all the telco's and cell co's  have now converted  from type N  to 7-16 
Din.  Good riddance to type N.
If you want to see something silly.... check out  1.25" heliax..  with a type N 
connector on it.  Complete with
that stupid bnc sized pin.  Here u have a connector the size of a coffee 
mug...with this stupid bnc pin !    

##  as I mentioned b4.... on LMR-1200DB, 7/8" heliax..and 1.25" heliax...... 
you can only get 2 x connectors these days,
type N and 7-16 DIN.   Andrew, etc, stopped making UHF connectors  for 7/8"  
heliax back in the mid 90's. 

##  I use silver/teflon pl-259/SO-239 in the shack only. All the hb amps have 
7-16 dins on em. After that, everything downstream
uses 7-16 din, including LP filters, remote coax switch's, lightning arrestors, 

##  and don't forget to use dow corning dc-4/5 on all the connectors, including 
threads, pins, and center females.  The 7-16 is clearly
the connector of choice for the bigger coax cables  [ it's ur only real 
choice].   For the smaller cables, like 213-U, and LMR-400, the
UHF QUALITY silver/teflon connectors are plenty good enough.  Type N for any 
size cable is a pita.  Odd ball connectors like C...and also
LC connector's are going out of vogue. 

Later... Jim  VE7RF


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