[Elecraft] Noise from KAT500?

[Wes]

Note Jim's words about a "good transmission line calculator" and take to heart 
Dan's ,AC6LA, words:


      "Think Twice Before Using a Web-Based Line Loss Calculator"

See his site here: https://ac6la.com/swrloss.html

Wes  N7WS

On 12/4/2023 12:50 PM, Jim Brown wrote:
> Clarifying a typo, "antenna tuners" like the KAT500 are networks that 
> transform the impedance presented by the transmission line to 50 ohms, 
> allowing the output stage to provide power to the line. This has NO effect on 
> loss in the line, which is determined solely by the match between the antenna 
> and the line, as Bob correctly states.
>
> That said, line loss due to SWR is often wildly overestimated. For 60M, I'm 
> using an 80M dipole fed with about 160 ft of a good RG11, which looks like 5:1 
> VSWR at the transmitter. Taking line loss into account, VSWR at the antenna is 
> around 7:1. A good transmission line calculator shows the excess loss in the 
> line due to VSWR to be about 1 dB, which is a small fraction of an S-unit. 
> Using FT8, I've confirmed more than 70 countries on that band with 100W, and 
> can work EU almost any night from my QTH near San Francisco.
>
> 73, Jim K9YC