Re: Measuring SSB RMS Power

Posted by John Oppenheimer on Jun 20, 2019; 3:35pm
URL: http://elecraft.85.s1.nabble.com/Measuring-SSB-RMS-Power-tp7653233p7653239.html

Hi Bob,

Document Table 1, Line 7. speech = V/5*2^.5. which is same as Vrms/5.
Using measured RMS ratios, Vrms=15.3, 15.3/5 = 3V, compared to measured
5.24V.

Speech is rather undefined, so not too worried about the discrepancy. My
speech with no pauses is ~= Vrms / 3.

Really what is being evaluated is gain resulting from speech compression.

John KN5L


On 6/20/19 9:29 AM, Bob McGraw K4TAX wrote:

> Here is a paper on the topic. This covers the correct procedure. 
>
> http://www.eng.auburn.edu/~troppel/courses/TIMS-manuals-r5/TIMS%20Experiment%20Manuals/Student_Text/Vol-A1/a1-12.pdf
>
>
> 73
>
> Bob, K4TAX
>
>
> Sent from my iPhone
>
> On Jun 20, 2019, at 8:38 AM, John Oppenheimer <[hidden email]
> <mailto:[hidden email]>> wrote:
>
>> Using DL1 with Oscilloscope to measure KX3 SSB RMS power:
>>
>> https://www.kn5l.net/ssbpower/
>>
>> Question, is this technique correct?
>>
>> John KN5L

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