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

[Edward R Cole]

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