I have been sitting here today working on the PCB for the WSPR amp and got to thinking about cooling for these transistors. Sure they run cool enough to touch, but im sure over time things are going to warm up some so I threw in a million vias around the transistor and though the source pad to wick the heat away. Then i can bolt this direct to some kind of heatsink and have more than good enough cooling to let her run for forever.
I have got a few boards here almost ready to send off for production. A new BPF board using shielded can inductors. an updated LPF board using SMD caps, an experimental audio filter board where I designed the CW and SSB filters, while I like the hypermite/SSBmite filters I probably cannot really in good conscience release my gerbers as they are a product sold by 4state qrp, so if these work, I can then release my gerbers. Finally I have this test board for the WSPR amp and another PA board for 2m/70cm to send for testing. So much happening at Rob’s Lab its not funny. 🙂