On 2021-06-08 14:11, jerry@... wrote:
All,
Nope, it was the linear. Almost a dead short across the supply
pins. It sucked all 35A out of the Astron power supply and wanted
more. I'm guessing that one of the final transistors let out the
magic smoke.
*** Unsoldered the final transistors - one of them tests as a MOSFET,
the other one as a 1.8 ohm resistor. I'm guessing the latter is the
bad one :).
There is another Chinese amp that uses a real RF transistor. HOWEVER -
this RF transistor is made for 850MHz up. They better have some *good* gain-killer for higher frequencies, or it'll tweet like a bird.
Maybe I should just start from scratch, find a proper device and design ( or find a design ) around it? The MRF101AN looks good. It's an LDMOS device, designed for HF...
- Jerry KF6VB
