Re: Cricket 30 Output Power Statistics


Chuck Carpenter
 

Even a fresh 9V battery has a high internal impedance.  And they droop quickly with a significant load.

Using a good power supply, well filtered and regulated would be requisite.  Also measure the key-down current and the power input to the final amp: determine efficiency. Then there is the also mentioned power meter. The QRPometer is a 2% accuracy meter, as I recall.
Otherwise, you might get good results with everyone using the same measuring method; a peak detector or an RF probe for instance and account for their associated tolerances.  A 10 meg, 1% DVM would help too. 

As Terry sez, from his QC experience and mine too, measurement can be a tricky business. Especially if you don't have traceability to a "gold standard"...
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Chuck Carpenter, W5USJ
EM22cv Rains County, TX

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