It isn't really odd at all. ?It's just that their supplier has gotten some very poor quality BNC connectors. ?I've had 3 of them with the larger center pin that would not make good contact. ?Replaced them all with Amphenol BNC connectors from Digi-Key. ?It appears the Chinese can't measure things right when they make these things! ?Fortunately, it was readily noticeable on receive. ?However, I have transmitted into opens a number of times, high SWR antennas several times and still have intact IRF 510's. ?I firmly believe the IRF 510 problem is caused by poor quality (Fake) IRF 510's, not transmitting into opens, shorts or somewhere in between!?

Jim - W0EB

------ Original Message ------

From: "Brian L. Davis" <brianldavis@...>

To: [email protected]

Sent: 4/29/2018 5:23:30 PM

Subject: [BITX20] Something different this time...

I've seen some odd things but this is one of the oddest.
I have experienced intermittent receive and transmit, just momentary that seemed to be cable related.
Traced it to the BNC jack.
Seems the female socket in the jack is slightly oversize and the male pin was a loose fit and occasionally showed an open circuit.
Changed the jack and the problem went away.