THERE ARE ABOUT 4.17 WATTS OF REFLECTED ENERGY FLOWING BACK THROUGH THE
BIRD AND THE BIRD COMPLETELY IGNORES IT. So the Bird is not even yielding
valid readings for forward and reflected power through itself. That's
exactly what I have been saying all along. If it were calibrated for
75 ohms, it would indicate the correct values.
--
73, Cecil http://www.qsl.net/w5dxp

Cecil, With a 1/2 wl of 75 ohm line terminated with 50 ohms at both
the source and load end, the 4.17 watts reflected energy does not flow
back thru the Bird. With 100 watts incident on the source (Bird), 100
watts will be either radiated, or consumed as heat at the load end.
4.17 will be reflected back to the source. When it reaches the source,
a portion will be reflected back towards the load, and a portion
consumed as heat. ect. The small portion consumed by heat might
account for the 1/2 needle deflection Owen observed on reflected power.
4.17 watts does not flow back thru the Bird as reflected power, and
the Bird, of course acknowledges. I don't think the Bird ignores that.
I acknowledge that the Bird does not report the actual forward/reverse
power in this example
Gary N4AST