[Elecraft] Best Coax for Jumpers and Interconnections for SO2R operation with K3 & KX3

[Clay Autery]

For exterior use, I choose to use the LMR-xxx-DB series which is
impregnated with a moisture reduction substance....  intended for direct
burial, it adds an additional measure of protection.

______________________
Clay Autery, KG5LKV
MONTAC Enterprises
(318) 518-1389

On 2/24/2016 11:39 AM, Edward R Cole wrote:
> Just a comment on Times Microwave LMR cables:
>
> In outdoor application its "VERY" important to seal connectors properly.
>
> The aluminum tape shield oxidizes in presence of moisture with
> resulting change in impedance and attenuation.  I just replaced a
> 45-foot run of LMR-600 which hangs off my eme tower supported by a
> pilot cable.  Because it is run vertically water entered the upper
> connector and pooled at the bottom connector such that when I pulled
> off the N connector water poured out in a stream for a couple
> minutes.  I finally had to replace the run as SWR would rise every
> time temperature went above 32F.  After removal I cut away sections of
> the bottom end of the cable to reveal that  about 18-inches had badly
> corroded.  New LMR-600 run has my 2m SWR lower (0.14) than it has been
> for about three years (so this condition had been increasing over time).
>
> I run LMR-400, LMR-400UF, LMR-240 and LMR600 outside (along with
> LDF7-50A and LDF5-50A Heliax).  Heliax appears to totally isolate
> moisture to outside the copper shielding if connectors are well
> constructed and sealed.  I use the LMR-240 for receive lines after my
> preamps to run down to ground level where I connect LMR-400 to
> continue to the "shack".
>
> LMR works just fine if you keep moisture from entering the coax.  Only
> runs of RG-213 are to my 600m inverted-L, 80/40m inverted-V and to my
> tribander yagi.
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
>     "Kits made by KL7UW"
> Dubus Mag business:
>     dubususa at gmail.com
>
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