Iz oos,

I was thinking whether a MMIC up to 10dbm and an RD06HHF as driver like in the 10w qrp-pa-2008 might make sense

Whats that going to fix?? The transformers need to be reworked, the prior stages in the amp are are poor.? And a MMIC
at 10dbm is near compression unless you get something ERA5 but then at 75 ma you only get 20db of gain.

Think this out.? To get from the mixer to the antenna you need 60db of power gain total!

Now if you used RD16hhf you get maybe 16db of gain more like 13 with feedback so the gain is flatter.
For 1/10th the cost the IRF510 can do that.? Either way 13DB.

So you need 47 db of gain call it 48 as a round number.

Your going to get that from three stages.
NOTE:
The last stage must supply more than 500mw from 3-30mhz.? [likely gain at that power under 13db]
The stage before that will have to supply maybe 70 (max) milliwatts. [likely best gain at that power maybe 15db]
The stage before that at most 3-4 milliwatts. [gains of 20db possible at low power]

Getting high gain at low power is easier.? Hard at higher power.? Its bad to run at max gain as then
the results are variable from unit to unit.

FYI most all fets will produce a lot of gain down at 3mhz, that's not the problem, its getting the same
{or close} gain from 3 to 30Mhz.

I've repeated this more than a few times in the past two days. All I hear is what about this fix.
Go look in the wiki, its spelled out.? Don't like it do the research and think system level.
And please do not bring up a monoband radio that may or may not perform well as its not
relevant or even meaningful.? Its a monoband it does not not have to work at any other
frequency and every time I look its clear it will not work in a 3-30 case.

Allison