开云体育

ssb power had been showing abt 4.6 watts on digital watt meter. with no sign that something was amiss the ssb power has dropped to .9 watt. the digi mode power is still showing abt 4.6 w. i reinstalled the ssb firware but the ssb power is still really low. any thoughts or guesses and what say you that i could possible try !!!! ? thanks

--

73 ChuckR

Are you using a true peak-reading power meter?

?

Joshua

Are you providing audio when measuring power?? A load. long, HEEEEEEEEEELLOOOOOO or better is a tone from a PC speaker.

?

73

Evan

AC9TU

A useful way to measure true SSB output power from QMX+ is to select the 'two-tone' input, rather than 'ext. mic'.? This puts an almost full scale two-tone audio signal down the SSB path, with sine waves that an external power meter can easily read.

With SSB mic input, the peaks will be at that same level.? Most peak-reading meters are not fast enough to catch the full peak levels of an SSB voice signal.? That is why old-timers whistle into the microphone - the waveform of the whistle is constant enough for a power meter to read.

Stan