"Cecil Moore" wrote in message
...
Jeff Liebermann wrote:
Bird is very specific that their 50 ohm wattmeters are only useful in
a 50 ohm system.

What you seem to be missing is that it takes only a few
inches of 50 ohm coax on each side of the directional
wattmeter to force a "50 ohm system". 50 ohm coax *IS*
a 50 ohm system, i.e. the load doesn't matter.

All this is easily proven by wading through the math.
--
73, Cecil http://www.w5dxp.com
"According to the general theory of relativity,
space without ether is unthinkable." Albert Einstein

The accuracy of a Bird for measuring power goes out the window for an SWR
other than 1:1. Are you saying that if you put an unterminated 3 inch piece
of coax on the Bird you have a 50 ohm system? That sounds like semantics
rather than Math. In fact you would have a 50 ohm system if you left the
antenna port disconnected, Then you could say you had an unterminated 50
ohm system. Real handy huh?