[TowerTalk] LMR-900

[Blake Bowers]

In my case, pretty well documented.  UHF Community Repeater, and a VHF
public safety repeater.  After replacing everything else, replace the LMR 
and
the recieve issues go away - no more noise introduced.

google "lmr cable repeater" and you will see some more.

Works great on base stations, just not on duplex situations.


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----- Original Message ----- 
From: "Roger (K8RI)" <K8RI-on-TowerTalk at tm.net>
To: <towertalk at contesting.com>
Sent: Friday, July 16, 2010 7:53 PM
Subject: Re: [TowerTalk] LMR-900


>
>
> 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.
>