[Towertalk] 40 meter yagi matching

[Mike Gilmer, N2MG]

The return loss improvement caused by cable attenuation will be twice 
the one-way cable loss, in this example: 4.9dB.  That's enough to make 
an "infinite" SWR (at the load/antenna) look like 3.5:1 (in the shack), 
or 3.5:1 look like 2.0:1, etc.

Mike N2MG


WB2WIK wrote:

> You'll note Bury Flex, like any other .500" or smaller 50 Ohm cable, 
> has attenuation that remains about constant below 10 MHz, and it's 
> about 0.7 dB/100' best case.  350' would be 2.45dB.  That improves 
> return loss   by 2.45dB, and VSWR measurements will be 2.45dB better 
> than "actual."  That's quite an improvement!