To get the transmitter much more efficiently we must do another mod,
described by Marc PA1O – removing one of the capacitor in PA board. This is exactly
described in his article about FT847 filters, but will be presented also here more as
“how-to” for those who did not read it before.
After removing all screws from upper part of TRX, under the Main Board we will
find PA stage board.
To do the mod we must pull the PCB out of chassis, so let’s start with unscrewing all
necessary screws, all of them including transistor screws. Then we should disconnect
two HF outputs on the rear. Be careful, as these pins need to be bend a bit to suck the
solder out.
At this point please look carefully for two small bronze spring soldered to PCB. This is
additional ground, and it’s nothing exceptional in them, except they are soldered with
small amount of tin, and likes to broke from PCB and jump somewhere.
As we don’t need them to make short circuit after mounting PCB back– take look on
them and make them soldered well.
After PCB removal ( no need to disconnect any cables, just gently pull the PCB
back and lift it up, and rotate upside down ) we need to locate two capacitors located
near PA transistors marked Q2 and S2. We will remove this one marked S2.
