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Re: [TowerTalk] LMR-900

To: towertalk@contesting.com
Subject: Re: [TowerTalk] LMR-900
From: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>
Date: Fri, 16 Jul 2010 20:53:14 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>

On 7/16/2010 8:08 PM, Blake Bowers wrote:
> There is a school of thought out there that many subscribe
> to, myself included, that will not use LMR cables for
> long runs on a repeater, due to the noise that tends to be
> generated.
>    

I've never seen it to be a problem.  Is this something they are afraid 
of, or something they have experienced and documented.
If some one did have a problem, was it water getting in the coax.  I've 
had that problem even with double shielded cables.

The largest problem I ever had was with grounded  EHS. Every time it'd 
move in the thimbles the noise would over ride a 50 watt mobile just 2 
miles out. Of course rubbing an 8" screwdriver on the guy line would do 
the same.

The only problems I've had with LMR cables was when the LMR-400UF rubbed 
through the jacket on the top of the tower and when the power dividers 
leaked water through the N-connectors into the LMR-400UF.

Getting water in at a repeater is highly unlikely as the coax connector 
is recessed into the bottom of the antenna and protected from the elements.

I wouldn't hesitate to use it although for repeaters we can usually find 
7/8" Heliax or larger for a low price or even free. In that case I'd opt 
for the Heliax.

73

Roger (K8RI)
> Just as an aside.
>
>
> Don't take your organs to heaven,
> heaven knows we need them down here!
> Be an organ donor, sign your donor card today.
>
> ----- Original Message -----
> From:<TexasRF@aol.com>
> To:<w1ksz@q.com>;<towertalk@contesting.com>
> Sent: Friday, July 16, 2010 10:52 AM
> Subject: Re: [TowerTalk] LMR-900
>
>
>    
>> Just for clarification about LMR900:
>>
>> There absolutely is a coaxial cable called LMR900 made by Times Microwave
>> and sold through their distributors. It is a low loss and quality cable
>> with
>> performance approaching that of 7/8" Heliax type cables.
>>
>> There is not a product offered called LMR900U.
>>
>> Cables sized from LMR600 and lower are available in the standard or the
>> "U"
>> version. The U designator implies a stranded center conductor allowing
>> more  flexibility as well as repeated flexing as in a rotor loop or crank
>> up
>> tower  service.
>>
>> It is extremely unusual to see an amateur installation using a size larger
>> than LMR600.
>>
>> 73,
>> Gerald K5GW
>> retired GM/TexasTowers
>> (an authorized Times Microwave Distributor)
>>
>>
>>
>>
>>
>> In a message dated 7/15/2010 11:22:13 P.M. Central Daylight Time,
>> w1ksz@q.com writes:
>>
>>
>> Check out page 64 of the August issue of QST. If it's in print,  it must
>> be true !!
>>
>> 73, Dick, W1KSZ
>>
>> _______________________________________________
>>
>>
>>
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>>      
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