On Mar 28, 2005, at 5:53 PM, Gary Schafer wrote:
> If it is a peak reading bird it should show the same as with carrier.
... provided that the anode PS is regulated and one takes a reading
before the coax melts.
>
> 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
>>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>>
>>
>> _______________________________________________
>> Amps mailing list
>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>>
>
>
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
>
Rich Measures, 805.386.3734, AG6K, www.somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|