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[TowerTalk] Connectors

To: <>
Subject: [TowerTalk] Connectors
From: (Guy Olinger, K2AV)
Date: Tue, 3 Apr 2001 15:21:53 -0400
With 1500 watts passing through an N connector, a flat 50 ohm load gives 
roughly 275 volts and 5.5 amps. A two to one SWR could raise the voltage to 
roughly 400 volts or the current to roughly 8 amps, if the connector was 
unfortunately situated in a voltage or current maxima. 

These would fall into the range of reasonably encountered currents and voltages 
in *legal* amateur stations.

How much of a safety margin? Two to one? Figure whether you are happy with 16 
amperes of RF on that little N pin. Or whether you like 800 volts of volts of 
RF on the gap between a BNC center conductor and sleeve.

Otherwise just understand you are running "tight" on that N connector.  

I have N connectors for my 1 1/4 hard line. Wonder if W8JI has posted just how 
he "machined" the hardline N connectors for UHF?

73, y'all,


> From:
To: <>
> Date: 2001/04/03 Tue AM 08:12:29 EDT
> To:
> Subject: [TowerTalk] Re:Connectors
>  Well, ofcourse UHF is perfectly fine. N is also perfectly fine.
>  I guess UHF will take more power but for HF unless you do
>  run a 4 by 5 at full blast N will be ok, N will take several KW´s
>  on HF bands year in and year out. If one runs "serious" EME
>  power on 144 MHz N is not a good idea but then again I know
>  people runing 2 - 3 KW´s using N connectors with no problems.
>  Also the loss or impedance deal is no issue at least below
>  400 MHz. I once years ago did measure UHF N and other
>  connectors and nothing of any bigger significanse happens
>  untill you move above 400 MHz so for 144 and below dont
>  worry to much.
>  Finaly on the installation bit. Like anything else it has to be 
>  done right. I dont think its any harder installing N´s then UHF´s.
>  However I dont solder any more, always use crimp connectors.
>  73, Jim SM2EKM

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