Re: Modify MFJ 815b wattmeter for QRP use???

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From: George, W5YR (w5yr@att.net)
Date: Thu Jun 20 2002 - 11:27:52 CDT


Zack, my understanding is that it is the power level measured at the
transmitter output to whatever load is present.

73/72/oo, George W5YR - the Yellow Rose of Texas
Fairview, TX 30 mi NE of Dallas in Collin county EM13qe
Amateur Radio W5YR, in the 56th year and it just keeps getting better!
QRP-L 1373 NETXQRP 6 SOC 262 COG 8 FPQRP 404 TEN-X 11771 I-LINK 11735
Icom IC-756PRO #02121 Kachina 505 DSP #91900556 Icom IC-765 #02437
 

"Lau, Zack, W1VT" wrote:
>
> I'd suggest replacing the coupler circuit with one
> that has a tighter coupling factor. It is quite likely
> that the meter scale is calibrated to the particular
> detector circuit used.
>
> If you used a - 6dB coupling circuit, 75% your power
> would go to the detector circuits and 25% would go
> to the antenna.
>
> Question for QRP gurus--with 1.25 watt out of the
> transmitter and 0.94 watt out of the wattmeter to the
> antenna--how much power do I claim for QRP
> awards and contests?
>


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