Allard, your final amplifier is not being driven enough. You have low transmit power. If you have followed the wire up process by inserting your amp meter in the PA positive brown wire and it read 100mA but not 1Amp when you spoke into the mic, then you need to adjust R136. It's a flat silver trimmer on the same side of the board as the PA. Adjust it counter clockwise to increase your drive until speaking into the mic with a long aahhh gets you 1 Amp on your meter. If your meter doesn't show 100mA first, then you need to adjust RV1 blue trimmer counter clockwise until you do get the 100mA the adjust R136 to get 1Amp.
This really does need to be included in the wire up notes. It could have saved me a whole dang month Farhan!
Not to mention the diode I needlessly removed while desperately trying any possible solution to the low TX power problem.
At least you changed the red vs. brown calibration wire kills the raduino thing.
I'm still bitter!
Sorry Allard, just read the first paragraph.
