Well, first I would turn the power OFF and let them cool a bit.
Then I would find a copy of the SCHEMATIC, and locate a voltmeter and other diagnostic tools
From MEMORY, I don't think there is power applied to those transistors when in RECEIVE, so I'd start the sBitx and see if there was voltage on their collectors.? ?If there IS and they get hot again, then yhou can start to diagnose WHY there is power applied to them.? ?They do run HOT when in normal transmitter usage.
That might get you STARTED, but this is going to be some work dealing with the schematic.? ?It is a process of breaking things down in to modules, dissecting which portion is doing somethin you?don't expect, and then figureing out why, over and over and over again.
On Sun, Feb 23, 2025 at 7:29?PM Michael Bales via <mikebales73=[email protected]> wrote:
So I have had the board running for about a week. However, today I noticed that my output power is reduced, and the 4 drivers are very hot, with just power on, sbitx not started.
?I see nothing obvious. I would like some suggestions as to where to begin, as I have made the mistake of getting the board only (which I disagree with having no recourse with HF Signals, regardless of cause).?
