Disaster with a Marconi TF893A Output Power Meter

[Skywave]

To be honest, the R-loss method under discussion here is fine, and is normally the most convenient way to measure a substantially-resistive Zin.
Mark

"A substantially resistive Zin".
Quite: and also that that Zin (with a zero or a small reactance) is substantially greater that the source resistance. If it isn't then that source resistance needs be allowed for in the resulting arithmetic - which is the point I was trying to make in my last two posts.
I've used that 'inserted resistance' method on many occasions, when the source resistance has - and has not - been negligible - and never had problems in so doing.

Al.