I still weather protect all connectors..as does the industry. Mastic and tape
or 3m coldshrink...but I do live in a hurricane prone area....
Cecil
K5DL
Sent from my iPad
On Apr 25, 2013, at 4:57 PM, "Bob McGraw - K4TAX" <RMcGraw@Blomand.net> wrote:
> That's why I use N type connectors. Much more likely to be water proof when
> installed correctly. UHF connectors are inexpensive and not considered water
> proof. Most commercial installations will use N type connectors for
> waterproof reasons and constant impedance reasons. Of course they are more
> expensive.
>
> I see a N connector on the line at the house, N connector on the line at the
> top of the tower. Then N connector with a piece of RG-213 on one end and a
> UHF on the other because that's what the balun uses. That the maximum number
> of connectors exposed. No adaptors required.
>
> I have 6 runs of LDF4-50 configured this way and up the tower at the house.
> The 100 ft repeater tower as 12 runs of LDF4-50 with an antenna on each one.
>
> 73
> Bob, K4TAX
>
>
>
>
>
>
>
> ----- Original Message ----- From: "Mike Wetzel" <mjwetzel@comcast.net>
> To: "'Craig Thompson'" <craig@thompsonet.com>; "'GARY HUBER'"
> <glhuber@msn.com>
> Cc: "'SMC'" <smc@w9smc.com>; "'TenTec Reflector'" <tentec@contesting.com>;
> "'W9AML group-email'" <w9aml@midlandsnetworking.com>; <DX-IS@yahoogroups.com>
> Sent: Wednesday, April 24, 2013 12:07 PM
> Subject: Re: [TenTec] [SMC] OT: Half inch Andrews Heliax LDF4-50A vs LMR-400
>
>
>> I would also agree with Craig.
>>
>> There are more possible failure points with the connections but really not
>> loss. If there was loss the connectors would heat up which they really
>> don't. Imagine how hot it would be if you were running RTTY at full power
>> and you had just .1 db loss at a connector in a sealed connection.
>>
>> Mike W9RE
>>
>> -----Original Message-----
>> From: SMC [mailto:smc-bounces@w9smc.com] On Behalf Of Craig Thompson
>> Sent: April 24, 2013 12:53 PM
>> To: GARY HUBER
>> Cc: SMC; TenTec Reflector; W9AML group-email; DX-IS@yahoogroups.com
>> Subject: Re: [SMC] OT: Half inch Andrews Heliax LDF4-50A vs LMR-400
>>
>> Hi Gary
>>
>> I would use the 1/2" Heliax. I use both and the outer jacket of the Heliax
>> is superior to the LMR for both water and sun. It also has lower loss. I
>> would use LMR400 UF or similar for the rotator loop. Use all UHF connectors
>> for connections.
>>
>> 73, Craig K9CT
>>
>>
>> On Wed, Apr 24, 2013 at 11:37 AM, GARY HUBER <glhuber@msn.com> wrote:
>>
>>> 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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