[Amps] BirdŽ 43 Manual

[Phil Clements]

Subject: Re: [Amps] BirdŽ 43 Manual


Page 4-1 section 2 of the Bird 43 manual:

"Where appreciable power is reflected, as with an
antenna, it is necessary to subtract reflected from
forward power to get load power"

Mark  WB8JKR


This can easily be demonstrated if you have two dummy loads.
Connect one to the Bird and run up some RF power to make the
meter read a convenient value.
 Note forward power and make sure reflected power is zero.
Remove the RF by un-keying the transmitter; leave the power
control knob where it is. Connect another load in parallel to
the existing one.  Subtract reflected reading from forward reading
and the result should be the forward reading you got in step one.

Reflected power is not magically eaten by tank circuits, transistors, or
tubes. It does what it is named for; it keeps reflecting up and down the
transmission line.

(((73)))
Phil, K5PC