Well, let's wait with celebrating until I replace the MOSFETs and find the device working properly.?
What annoys me is that I didn't detect that parasitic "diode" between gate and source at the first measurements after disassembling the transceiver. However, maybe the damage was increasing while I tested it.
73,
Wojtek?
sob., 1 mar 2025, 12:40 u?ytkownik Gordon Gibby KX4Z via <docvacuumtubes=[email protected]> napisa?:
Delighted that you found the problem. Interesting that both drains showed an AC voltage even though one device was effectively shorted.? That is surprising to me.
Wish you the best
Gordon kx4z?
On Mar 1, 2025, at 06:38, HA3HZ via <gyula=[email protected]> wrote:
?
Wojtek,
Buy 10 pieces so that you can choose the two with almost the same opening voltage.
They may be the same in shipping, but there is still a difference between them.
You can install them without Aluminum nitride with the old mica, and use some kind of fan to cool the heat sink from the back.
Read another message where I wrote how I use the v2.
You can easily replace the AlN ceramic later if you look at which screw you need to unscrew to remove the heat sink.
Read and do the Bias adjustment as described here (you can also find the article on ).
?
It is important to do the adjustment with a 2A current limit!
