Hello DK7FC,

Friday, April 28, 2017, 2:40:41 PM


Amp circuit and info here:

http://www.w1vd.com/137-500-KWTX.html

I use the W1VD LPF set up too, a total copy of Jay's design

http://www.w1vd.com/LPF.html

This goes via RG-213 to a matching transformer outside to match to
tapped ferrite wound antenna impedance transformer, and then my big
loading coil, which in turn feeds a strapped ladder line vertical
feeder and my big horizontal quad loop aerial as the top hat. A
Scopematch shows perfect Volts to Amps balance when the variometer is
set to match TX frequency


Driver is a QRP Labs U3S, lots of people use these with the output
taken straight from the Si5351A device clock outputs at 2X frequency.

http://qrp-labs.com/ultimate3/u3s

Thanks Stefan

> Hi Chris,

> Maybe you can show a drawing of your whole PA schematic, including the
> driver and so on. I still don't fully see what you're doing there...

> 73, Stefan






-- 
Best regards,
 Chris                            mailto:[email protected]