Hi Michael,
Thanks - no, I don't have a power meter (yet) but I can measure how much power the radio consumes - should give some indication re TX Power.
What I could do is to use a signal generator set to either Mark or Space Tone and slowly increase the output voltage to see if I get the radio to transmit into a dummy. Apparently a nearby HT should pick this up. Power draw from the radio should start to increase eventually.
Question is how hi can I go. I've seen some TNCs going all the way to +/- 4V on their audio output.
Thanks
Marcel