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Re: [TowerTalk] LMR-900

To: "Roger \(K8RI\)" <>
Subject: Re: [TowerTalk] LMR-900
From: "Blake Bowers" <>
Date: Sat, 17 Jul 2010 09:04:15 -0500
List-post: <">>
Your mileage may vary.  I merely said that there
was a school of thought about it.  In the commercial world
there are even tower owners that ban LMR from their sites.

Connectors?  Could be of course, but over the course of
30 years in HAM and Commercial two way, I have been to
the connector rodeo more than a couple of times.   Even on
the base station applications that I have used LMR - I have never
had an issue that was traced to a bad connector on LMR that I
installed and passed off on - or my employees.

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: "Roger (K8RI)" <>
To: "Blake Bowers" <>
Cc: <>
Sent: Saturday, July 17, 2010 1:51 AM
Subject: Re: [TowerTalk] LMR-900

> On 7/17/2010 1:41 AM, Blake Bowers wrote:
>> 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.
> I'd be inclined to think the problem lies with the connections rather than 
> the cable.
>> google "lmr cable repeater" and you will see some more.
> There really aren't enough examples to be anything other than anecdotal.
>> Works great on base stations, just not on duplex situations.
> I never had problems with it. What I did have problems with was the 
> regular double shielded coax that was used for the jumpers on the cans.
> If it creates problems with repeaters it'd also create havoc with multi op 
> stations on the same HF bands where one is CW and the other phone or 
> digital and I've not heard of any problems there.
> 73
> Roger (K8RI)
>> 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: "Roger (K8RI)" 
>> <>
>> To: <>
>> 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.


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