开云体育

First off, out of curiosity, are you swapping out that dual diode for any particular reason? ?There's one confirmed case of that part causing low power output, if that's what you are chasing. ?But dozens of different reasons power output might be low. ?You generally want to figure out a problem before randomly replacing parts.

Sounds like you blew the IRF510. ?Can't imagine how changing out those diodes would do that. ?Maybe you went and touched something else too? ?If you can remember what that was, that could be a clue here. ? Monitor current into the rig, main power and PA 12v too. ?I think it should be on the order of 100ma for receive, maybe 300ma? on transmit with no audio into the mike. ?If it's much more, see what's getting hot. ?Glad I'm not in the same room. ?Hope you're wearing safety glasses. ?Did you ever get a 50 ohm 5 watt dummy load of some sort? ?You really need one. ?Hope you haven't yet gotten around to reversing the +/- leads from your power supply, that could fry most of the rig.

Those 1n60's will likely work well enough. ?1n4148's might be a safer bet, since they have been getting used in Bitx's for over a decade. ?The 100 ohm pot is used to balance out the residual carrier if the diodes aren't quite matched. ?I wouldn't bother with that till everything is working, if then.?

Need an ace in the hole? ?Buy another Bitx40. ?You'd be in for $118, still cheaper than any alternative. ?And have a whole bunch of spare parts. ?You've gotten way more than $59 worth of education out of it already.

I must say, you are at least persistent.

Jerry, KE7ER