[TowerTalk] LMR degradation

[Roger (K8RI)]

On 3/25/2013 2:31 AM, Jim Brown wrote:
> On 3/24/2013 9:42 PM, Jim Hoge wrote:
>> Today I discovered that I have had environmental ingress beneath the
>> outer jacket of some ~8 year old LMR-400.
>
> In the latest (I think) version of his excellent Managing Interstation
> Interference," W2VJN notes that he observed degradation in the measured
> performance of stubs made of LMR400 that had been sitting in his garage
> for a bit less than a decade. He seemed to think it was due todegraded
> contact between the foil and braid shields. This was written several
> years ago. He may have more to say about it by now.

We've known for years the UF versions of the LMR cables deteriorate out 
in the elements. It follows that they'd possibly do so with age as well.

I found that the braid had almost disentegrated in some pieces of 
LMR400UF where the jacket "appeared" to syill be in good shape.  I 
thought perhaps the jacket had become porous, but perhaps not?I wonder 
which LMR400 he's talking about.

73

Roger (K8RI)


>
> 73, Jim K9YC
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