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A few years ago, I converted my trusty Drake W4 wattmeter to true peak reading using the info on these two sites:

[URL unfurl="true"]https://owenduffy.net/module/PepAmp/PeakAmp.htm[/URL]

[URL unfurl="true"]https://owenduffy.net/module/PepAmp/W4.htm[/URL]

Simple circuit to build. Works great. Powered by 12vdc/1amp wallwart.

To expand its usefulness Drake provides a chart for using forward and reflected power to calculate SWR.

[ATTACH=full]60327[/ATTACH]

The peak reading conversion turned this quality instrument into a meter as good or better than anything out there. Fun project too.

- 399

[QUOTE="unit_399, post: 797195, member: 7311"] A few years ago, I converted my trusty Drake W4 wattmeter to true peak reading using the info on these two sites: [URL unfurl="true"]https://owenduffy.net/module/PepAmp/PeakAmp.htm[/URL] [URL unfurl="true"]https://owenduffy.net/module/PepAmp/W4.htm[/URL] Simple circuit to build. Works great. Powered by 12vdc/1amp wallwart. To expand its usefulness Drake provides a chart for using forward and reflected power to calculate SWR. [ATTACH type="full" alt="SWR_Chart.jpg"]60327[/ATTACH] The peak reading conversion turned this quality instrument into a meter as good or better than anything out there. Fun project too. - 399 [/QUOTE]

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