[Amps] RMS VS Peak VS Average power and the Bird 43 wattmeter

[Gary Schafer]

If it is a peak reading bird it should show the same as with carrier.

73
Gary K4FMX

TexasRF at 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 at 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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