Hello.
I just finished building my Bitx40 v3 board using a amateurradiokits.in case and a Baofeng mic modified as per?
The receive seems to work well.? I hooked the radio up to a receive loop antennas and was able to hear some local stations called CQ for a contest.? I then plugged the Bitx40 into a dummy load and put an ammeter in line with the power connection to do the alignment.? This is where things went a bit wrong.??
According to the Alignment of the Bix 40 section of this page
I should adjust RV1 fully clockwise so the ammeter reads 0, however when I turn the radio on the ammeter immediately reads 150mA, no matter how I adjust RV1.? If I key down current jumps from 150mA to some other value depending on how RV1 is adjusted (between 280mA and 1A).? I also noticed that when I do the HAALOOOWW into the Mic current doesn't change at all even though I've keyed down (setting RV1 doesn't seem to change this at all).? I've also fiddled with RV136 which made no difference.
My PTT seems to be working, however I'm suspicious of the Mic.? I did check continuity from the pads of the electret all the way to the board and it is good.? The PTT and electret do share a common ground as per the instructions I linked above.
So basically two problems.
Receive current should be close to zero according to alignment instructions, but it's 150mA.? Also I push the PTT and current jumps a bit, but doesn't jump when I speak into the Mic.
Any thoughts?
Craig (VE6TBW).
