Ron D'Eau Claire wrote:
Mike, KT2E asked:
How accurate have you found the internal power meter/wattmeter to be on the
K2???
Reply: ---------------------
Mine is well within the 1/2 watt at 5 watts as stated in the specifications.
Measuring RF power at QRP levels is really not difficult. A low
forward-voltage drop diode from the 'hot' side of the RF line to a capacitor
that goes to ground will give you an accurate peak RF voltage across the
cap. Measure that with a high-impedance meter like most DMMs today. RMS
value is .707 times that reading. To get the power, multiply the RMS voltage
times itself (square it) and divide the result by the resistance: 50 ohms.
> my $.02 ========================================
Now! Someone pointed out to me several weeks ago that using the
Elecraft DL1 (dummy load)
with a DDM and a calculator ( the formula on the assembly sheet) works
very well and is accurate.
de "rc" kc5wa
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