If it is a peak reading bird it should show the same as with carrier.
73
Gary K4FMX
TexasRF@aol.com wrote:
>
> 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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