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That is not plastic, that is a mica sheet. It electrically insulates the transistor body (which is connected to the drain at 12v) from the heatsink while providing thermal conductivity to drain away

Well I'm really glad I asked. I would have tossed it right out! I'm assuming heat is what killed my finals, as swr never goes above 1.5 except for a brief moment when my tuner is doing it's thing. So

Aluminum nitride is a better choice for insulators than mica.? The AlN has better heat transfer, and it is almost the same as the aluminum heatsink.? Look for them in normal online places like eBay,

Status update: I have the bare pcbs and encoders. Just waiting for the connectors to show up early next week so I can do a quick test to make sure I didn't mess up. I'm setting up an Etsy store, as

Yeah I would like the opportunity to order a board as well. -- '72 Aaron K5ATG ( http://k5atg.com )

Depending on circuit design and pin layout, it is often necessary to insulate the flat back metallic side of transistors from ground. This used to be done with thin sheets of mica with heat sink

I believe so, mine has that as well -- '72 Aaron K5ATG ( http://k5atg.com )

Is there supposed to be a piece of plastic between the IRF510s and the heatsink? (The smaller oval shaped piece.)

Yes, that is what I saw. T h a n k? y o u!

Assuming you only have a multimeter, you can try this.. Shorted Pin Check * Set your multimeter to the continuity or diode test mode. * Check for shorts between each pair of pins (Gate-Drain,

Well, unexpected follow up.... I was funning FT8 on 40m last night. I had JTDX and gridtracker running, but they weren't controlling the radio (mode was set to FT8, not Digital). So I was watching

I guess I did not explain well. I was looking for the EXPORT button, which as you can see in the screenshot I supplied, is not present. It was referred to earlier in this thread:

You may remember this description: Adding external relay control two V2/V3 ( /g/BITX20/topic/103300785#msg106854 ) -- Gyula HA3HZ

Would something like this work? https://www.electroresales.com/radio-communications.html ????Keying Adapter (HV Switch) There is a circuit diagram in the user guide. -JJ

Have you tried the CW mode and just hitting the PTT button on the mic? Do that with the DRIVE set to 100. Do you get anything out then?

Guys, I know I saw some information on keying an external amplifier with the sBitx but I fail to find any information when doing a search. Anyone have that info handy? TU Barry K3BO

Sounds good, I'll give that a go tonight. hmmm.... Actually, you've reminded me of something. When I export the log to adi and upload to LotW, it complains that one of my entries is ignored due to

Jeff, I had my sBitx log open while operating FT8 mode from sBitx over several days and didn't encounter any issues. You may need to perform a *git stash* and *git pull* then compile with

Nick, No problem.? Remember that R1 is not needed for normal operation; only if you want to install a battery for portable operation. 73 Evan AC9TU

Thanks Evan, I'll have a ratch in my of stuff, and failing a revelatory discovery, order new resistors. Sorry this is such a long tale of woe. Best, N