On 9/5/19 1:01 PM, Jamie WW3S wrote:
whats the difference between LMR-400 and RG-400 ?
totally different kinds of coax, just the numbers are similar.
RG-400 is a dual shield coax PTFE dielectric with stranded center
conductor, about 0.2" in diameter (think RG-58/59 sized) - fairly flexible.
LMR-400 is a 0.4" diameter (that's the numbering, LMR-600 is 0.6", etc.)
with foam polyethylene dielectric, solid center conductor, aluminum shield.
Aside from being a LOT stiffer, LMR-400 is bigger and lower loss
(roughly 0.7 dB/100ft for LMR-400, vs 2.2 dB/100ft for RG-400)
Use the RG400 for making chokes and such.
Use the LMR-400 for the run to the antenna.
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