10 GHz - 1Watt PA, made from 14 GHz surplus stuff
sold by ON7UN
matching is done with the ceramic of SMD capacitors, be sure to carefully cut off the solder ends
at the input and output I used the ceramic of 1 nF caps, all others are 1 pF (all 1206, but 0805 will work also)
the area between both transistors is the most sensitive
do not to short circuit the coupling strip between both transistors as K30M will smoke off for sure!
the usual methode of moving small copper strips did not work good for me
if you have own experience on that issue and you want to share it with others please mail it to me..
use 0805 or 1206 capacitors with low values (10pF or less) with white ceramic (NPO material , low RF losses)
capacitors are glued with "Velpon" ( a dutch brand) glue, don't use cyanoacrilate like "one second glue"
tune for minimum smoke and maximum power with a woodenstick, use evantually a ceramic trimming stick for
determing the spots where a capacitor can be placed. ( fast scan for sensitive places)
a spectrumanalyser for this tuning is prefered above a wideband powermeter, oscilations can be seen on a analyser
I used a HP141T with 18 GHz oplugin and a hp8620 sweeper with 8-12 ghz plugin as
this bias circuit by DB6NT
is used (slightly modified)..
MGFK25V4045 Data sheet
MGFK30V4045 Data sheet
here is what you can do with the rest, tnx DJ6JJ