And, along a similar vein: If a string of 50% duty cycle dots at say 50
words per minute are transmitted, what should the Bird meter show for power
output compared to full carrier?
73,
Gerald K5GW
In a message dated 3/28/2005 3:14:31 P.M. Central Standard Time,
Dennis12Amplify@aol.com writes:
For the EXPERTS.....,
I have a question which I believe will combign the two most interesting and
informative threads we have had going here on the reflector for quite some
time.
Why is it that a Bird 43 with a calibrated peak reading kit only reads
THREE times the power for a peak reading of a 100% modulated AM waveform,
instead
of FOUR times the power as the textbooks all say it should?
Is it because the 43 is responding to a Half wave rectified signal but
'calibrated' to read as though it was responding to something else?
I believe I have an answer, and it is directly related to both threads, but
I was hoping for some open discussion of the subject to see where it goes,
and if it goes in the direction of my solution or not...
Hint: It is a mathematical relationship between the average response of the
43's analog meter movement and the FCC's definition of power output.
Regards,
Dennis O.
It is surely the best thread we have seen on this reflector in a long long
time. Very comprehensive, informative and lots of fun to follow.
Thanks to all,
Alek. VK6APK
At 08:33 PM 27/03/2005, David Kirkby wrote:
>John and Mary Powell wrote in a different thread:
>
> >Is there a body of opinion out there that considers the above subject
> has gone on far too long, or got out of hand. To me it appears as if
> academic intransigence has got in the way of the Reflector dealing with
> it's core business. I noted an earlier plea for an end to of
> this uninteresting topic, which evolved from a simple enquiry as to
> accuracy of the Bird 43 Wattmeter.
> >
> >Cheers
> >John Powell. ZL1BHQ
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