[TenTec] OT: Half inch Andrews Heliax LDF4-50A vs LMR-400

[Phil Sussman]

Greetings,

 From my experience, the use of Hardline on HF does not affect loss
very much. I've seen more problems with poor connector attachment
or lightning pinholes that allow water to seep in.

No matter the type of connector or type of hardline, the losses are
almost insignificant.

Good Luck,

73 de Phil - N8PS

-------

Quoting GARY HUBER <glhuber at msn.com>:

> As I consider the materials required to replace my 30 year old  
> tower, rotor, antenna and cables, I have several like new runs on  
> LDF4-50A terminated with N-male which could run from my ground  
> window (UHF female) to the top of my 53 foot tower (60 feet max  
> LDF4-50A cable run)  where a flexible low-loss 10 foot jumper would  
> terminate on a new BN-4000 and new TH-7 tribander.  This  
> configuration would require the 60 feet max LDF4-50A cable run,  two  
> half inch N female to UHF male adapters, one UHF double female and  
> 10 feet of high quality RG8 cable as the jumper to the BN-4000.
>
> The alternative which I'm leaning towards as it seems less likely to  
> have connector/adapter loss and other potential problems is a single  
> run of 75 feet of LMR-400 with factory terminated PL-259s between  
> the BN-4000 and ground window UHF female termination. My current  
> installation is 60 feet of RG-9913, a UHF double female adapter and  
> a ten foot RG-8214 jumper.
>
> I know the half inch Andrews Heliax has a much lower loss figure  
> (0.357 db per 100 feet at 30MHz) for a given length versus the same  
> length of LMR 400 (0.7 db per 100 feet at 30MHz) , but I'm thinking  
> those three adapters (six connection points for loss) and their  
> potential problems make it a wash or maybe the advantage goes to the  
> 75 foot run of LMR-400.
>
> I'd be interested in any comments or experiences you might have on  
> the subject.
>
> 73 ES DX,
> Gary -- AB9M
>
>
>
>
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