Jeff Liebermann wrote:



Notice that the SEC-1235 is a 12V 30A device and
current limits at 35A. How many amps are you drawing?



** Transceivers tend to draw a LOT LESS current while in receive mode - which is the only time PSU generated RF noise might be a problem.

SMPSs often send a fair amount of RFI back up the AC power cable, even when running at low power outputs which makes them troublesome when used with radio receivers - especially in the lower part of the HF band.

The OP's supply may have deteriorated components ( plastic film caps most likely ) in the filter fitted to the incoming AC line. Only way to know for sure is to get another, similar supply and try it.

If the OP has a linear 12V supply that can run the transceiver in receive mode, he should try that too.



...... Phil