[TowerTalk] Coax Losses on 160 and 75?
Steve Hunt
steve at karinya.net
Fri Aug 12 14:40:33 EDT 2016
You can also measure loss using a single-port analyser.
The underpinning maths is here:
http://www.karinya.net/g3txq/wet_ll/tl_formulas.pdf
Steve G3TXQ
On 06/08/2016 07:03, Richard (Rick) Karlquist wrote:
> No, this isn't the real deal. A 2 port vector network analyzer
> with full 2 port calibration is the real deal. The wattmeter
> approach has many error effects that are difficult to account
> for. The fact that the meters read identical when cascaded
> does not mean the subsequent measurement is perfect.
> The dummy load may have a mismatch. The characteristic
> impedance of the line is not exactly 50 ohms and is actually
> complex in general. Etc.
>
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