[TowerTalk] Crimp on Coax connectors

[Jim Brown]

On 9/5/2019 1:01 PM, Jamie WW3S wrote:
> whats the difference between LMR-400 and RG-400 ?

LMR400 is the size of RG8, center is copper coated Al, shield is foil 
plus copper braid. Foam dielectric.

RG400 is the size of RG58, center is stranded silver-coated copper, 
shield is double braid of silver-coated copper. Dielectric and outer 
jacket are Teflon. Loss is similar to RG58 (RG58 and RG400 are not 
specs, simply generic descriptions).

The 2006 Belden book (more than an inch thick) lists 18 RG58/U and 52 
RG59/U cables. Loss at 10 MHz for the RG58 cables varies from 1.1 to 1.5 
dB/100 ft (3.6-4.9 dB/100m). RG400 is about 1.2 dB/100 ft at 10 MHz. 
I've found Harbour Industries RG400 on ebay at good prices.

The virtues of RG400 are its flexibility, high temperature and power 
ratings, its excellent shielding, and its small size. The virtue of 
LMR400 is low loss.

73, Jim K9YC