> Do you believe yours? Article notes +/-5% is typical for lab grade > wattmeters.
Even some of the pseudo-lab-grade wattmeters can vary from published specifications. One very popular wattmeter with a perfect review rating on eHam, suffers from very poor indicated VSWR accuracy below 5-watts. Based on what I could measure here, it was symptomatic of the low-power accuracy problems described by Roy Lewallen, W7EL, in the February 1990 issue of QST. Although the manufacturer claims calibration to NIST traceability, it is likely calibrated at moderate power levels. This wattmeter is frequency compensated -- but not temperature compensated. OTOH, I own two competing wattmeters that are truly temperature compensated with NIST-traceable calibration, and VSWR agree with each other down to 100 mW. Paul, W9AC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
