Hello all.
I've been having a great time operating my 7mhz QCX. Worked Russia, Switzerland, Denmark etc and had a great time.
This afternoon I hitched up the 'scope to a 50 ohm dummy load and checked the RMS voltage across it at 7.030 mhz. It was 11.6 volts RMS, equating to an RMS power output of 2.69 watts (I'm using a good 12 volt power supply, exactly 12v on both receive and transmit).
The waveform was a nice approximation to a sine wave. I'll upload a screenshot, in case any one is interested.
I then checked the output at frequencies above and below, at 100khz intervals. The highest output was around 7.9mhz, 14.1 volts RMS, i.e.3.97 watts.
I can type in the full range of results, again if anyone is interested.
Now I know that 50% more power doesn't make a huge difference, and the rig works very nicely as it is, but I am curious to know whether I could try tacking? some capacitors across the ones in the existing low-pass-filter and move the 3.97 watts into the 7mhz CW zone? Or might I risk messing up the filtering and causing mayhem? I seem to be okay at winding toroids, they have the specified number of turns and are tidy (my T1 winding went very well, first time!), so I don't think they are to blame.
Any advice or comments gratefully received.
Best wishes,
Julian
G4ETS
