73 Enno,
I too find the same as you. I don't know the answer. It sure works on both 30/40, which also is unexpected, after all I was trying to make mine work on 20/30 !
I would like to have higher power output but have not found the way to do it but I've not been trying very hard. I console myself that the difference is only maybe 1dB. A doubling of the power would only be 3dB. I'm pleased though that it works even better on 40m, which was surprising.
However the little extra power on 40m, in practice, remember of course that on 30m any antenna is going to perform better generally for any given height, than on 40m, so in reality of on air practice, I think no disadvantage in the slightly less power on 30m, aside from the fact it is only around 1dB in my case, e.g. getting 2W instead of 3W, or 3W instead of 4W, depending on the voltage. So I'm happy with it. I'd like to find some cheap PA that would be a separate kit that would take power up to say 10W or so but could not find any such from searching eBay.
