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Just FYI: I’ve sold close to 1,000 of those units over the years.


Try using an analog reading meter. 9 times out of 10, it’s not dropping in voltage (at least that much) it’s the RFI causing the digital multimeter to react. Sometimes, especially when modulating, you can see the meter “freak out” and show all kinds of crazy readings.   Might not be the issue in your case.


With that said, they do drop a little in voltage. Through the years they’ve had different designs and some are better than others.


Off topic:  :  I tried running my Icom 7300 with it but it would shut down immediately upon key up and restart. These units drop in voltage on sudden current draws and then recover. That’s no big deal for an amp like that  (or shouldn’t be) but it is for a piece of ham equipment.