[TowerTalk] LMR-400, damage?

[Pete Smith]

There is also a "distance to fault" function on the MFJ-259B.  It's not 
foolproof, but I have found it useful on several occasions when I was 
having problems with shorted or open connectors.

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
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spots at telnet.reversebeacon.net, port 7000


On 7/20/2010 8:26 PM, john at kk9a.com wrote:
> I think that it is unlikely the LMR was damaged, especially since you have
> no other evidence that a lightning strike occurred.  While cable damage is
> possible, I have had numerous lightning strikes and have only seen one cable
> failure, a generic RG-213 where the outer jacket blew apart.  You can
> physically look at your cable and perhaps check the SWR.
>
> John
>
>
>
> To: Towertalk<towertalk at contesting.com>
> Subject: [TowerTalk] LMR-400, damage?
> From: Steven McGehee<list at qx.net>
> Date: Tue, 20 Jul 2010 16:43:03 -0400
> List-post:<towertalk at contesting.com">mailto:towertalk at contesting.com>
>
> Hello,
>
> I have a 150ft piece of Times Microwave LMR-400 in production with one
> end inside structure and the other connecting to a transceiver on a
> rooftop. We had some electrical storms come through in the past few
> days, and one evening we lost both the transceiver and the IDU (indoor
> unit) controller of said transceiver. Both were damaged and acting
> strangely, replacing just one of the two didn't work. To get the system
> functioning again we had to replace both the transceiver and the IDU.
>
> My question is, assuming the damage was caused by lighting (I haven't
> found any hard evidence to suggest it was, but, it seems to be the case,
> awfully coincidental otherwise) -- could/does LMR-400 "get damaged" by
> lightning? I feel like that's a very basic question, but I just want to
> be sure we don't need to replace that cable in addition to the two
> components we have replaced. Since the replacement work (two days),
> everything has been fine, but I didn't know if maybe, somehow, the
> internals of the LMR were potentially damaged too.
>
> On that note, is there anyway to test an LMR cable? In Ethernet
> scenarios I use a Fluke brand cable tester, is there a similar tool that
> can be used for "checking" LMR-400?
>
> Thanks.
>
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