On Mar 21, 5:24 pm, Dan Bloomquist wrote:
Keith Dysart wrote:
On Mar 21, 4:30 pm, Dan Bloomquist wrote:

Keith Dysart wrote:

On Mar 21, 3:06 pm, (Richard Harrison)
wrote:

Bird says of its Model 43 Wattmeter: "Experience using the "Thruline"
Wattmeter for transmitter tune-up, antenna matching, etc. (i.e. on
operating problems), shows that the power ratio is as useful in practice
as the VSWR."

One can see reflected power disappear at the transmitter terminals as a
match is made to the transmitter load. That eliminates stress on the
transmitter from reverse power.

I suggest that a more accurate description would read:
"One can see the indication on the meter go to zero at the transmitter
terminals as the match is made to the transmitter load".

Then, you have never matched with a reflection. Without the experience,
how can you make a claim? You have not made the observation yet you
claim what it 'should' be.

I may have misunderstood, but I thought that when Richard said "see
reflected power disappear" he was observing the Bird Wattmeter
mentioned
in his previous paragraph and watching its indication go to zero. If
this
is not what was meant, then I need elaboration.

My mistake. You both said something that is not what happens. I will
assume you are looking for no reflection between a transmitter and a
transmatch. But the source to a transmission line is on the other side
of that transmatch. You will most certainly see a reflected wave if the
end of that transmission line is not terminated into purely 50 ohm load.

Otherwise, I think I said the same as Richard in different (and,
arguably
more precise) words.

I see that. But neither is the case. If you are matching a transmitter
to mis-matched line, the reflection does not go to zero. In fact, the
reflection is a function of the line and termination and is constant.
Nothing you do at the transmitter can change it.



...Keith

Best, Dan

I agree with what you say.

I had made the leap that Richard's configuration was transmitter,
Bird, matching
device as that seemed to be the only way that an adjustment could
bring
the meter on the Bird to zero. If this was not the intended
configuration
then I am completely confused and Richard will need to clarify his
intent.

....Keith