Hi JoergU

There is a very nice power calibrator design available from a German ham.
Just google for "dl7av calibration". Use a translator, to translate the

German text.

It creates a 0 dBm sine output. I built it myself (cost approx. 10 EUR)

and the

harmonics are >30 dB suppressed.

Many thanks for this. Very rare for this to happen, but it happened to be
exactly WHAT I needed and WHEN I needed it... so I googled DL7AV
calibration and found several pages, of which the main one I followed was
http://dl6gl.de/station/selbstregelnder-kurzwellen-kalibrierungsgenerator

So I built my own version from entirely junkbox parts yesterday afternoon
and I have made a YouTube video about it see https://youtu.be/732ESoul088

This will be very useful in my case - thanks again!

73 Hans G0UPL
http://qrp-labs.com