RF_AMP 45W EBAY
Very well designed, high quality PCB all parts neatly packed.
With the correct diagram relative easy to build.
The newest PCB is June 2016 documentation pictures shown at Ebay are outdated
incredible value for money 14$
Although could not yet test with RF due too high bias Q2 0.6A - 0.7A
even with shorted B-E 0.6A flowing
Considering the very low prize the supplied 2SC1971 might be a fake
Mitsubishi does not longer produce this or replacements TO220 medium power RF transistors?
If someone could give a hint which eBay
2SC1971 good quality original Misubishi
is a real working one
That would be much appreciated
left is the supplied "2SC1971" not working 0.6A and not adjustable bias
right is a better working possible original Misubishi it is 1mm smaller
With that one i could adjust the bias to 100mA ( diagram below R5=330 OHm)
the bias of the IRF530 need to be about 25 50mA no more no less for max gain
it is a bit tricky adjusting the 2 potmeters they regulate in mirror.
3.5MHz c.a. 200mW drive to Q2 (Q3 disabled)
>>20Watts out (Wattmeter dummyload 20W limit)
power 12V limited to 5A
I doubt that it will perform real good at 28MHz with the IRF530 in the final
But if it comes even close to the stated specs below it would be great
Not yet found the correct PCB parts layout of latest PCB version 2016 06 21
Using the actual diagram it will not present difficulties.
LOTWUploading the WSJT adi log to LOTW is not working for QSO in FT8 mode yet
Importing JT65 FT8 adi log into the N1MM general log is also not possible
Not exact matching contest type records are rejected.
QRZCOM online log does not have these restraints.