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Re: [TowerTalk] Heliax Connectors

Subject: Re: [TowerTalk] Heliax Connectors
Reply-to: "Tower and HF antenna construction topics." <>
Date: Tue, 20 Apr 2010 18:45:27 EDT
List-post: <">>
Jim, I can tell you from first hand experience that a pair of UHF  
connectors and double female for a splice  will raise the vswr on 2m from  flat 
about 1.5:1. Now in some circles that is no big deal but most of us  would 
avoid that like the plague.
The effect on 6m is not as bad but noticeable. At 70cm (and this is less  
than 500 MHz), the effect is a 2:1 bump.
I have tested at h.f. the "good" Amphenol connectors and the so called  
fleamarket junk UHF connectors and see no difference. If the metal is there, 
and  the insulation is there, what is the problem? We are dealing with a 30 
ohm  connector at best so there is plenty of room for impedance variation 
without  causing a problem. Even twist on wire nuts for a coax connection has 
decent vswr  at h.f..
Gerald K5GW
In a message dated 4/20/2010 4:35:08 P.M. Central Daylight Time, writes:

On Tue,  20 Apr 2010 16:57:19 -0400, Ryan Jairam wrote:

>I would just get N  connectors and adapters and use that instead.
>Practically nobody else  but ham and CB use UHF connectors anymore.

Think about WHY. There's  nothing wrong with GOOD UHF connectors for 
use at HF and VHF, and hams are  almost the only users of HF in any 
volume. There's no advantage to using N  connectors below at least 
500 MHz, and they cost a lot more. 

Note  that I'm talking about QUALITY connectors from major mfrs like 
Amphenol,  Kings, and Pomona, not unbranded junk from ham vendors and 


Jim  K9YC


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