You’re on the right track. I suggest you use a very thin layer of thermal compound between the heat sink and flats of the TN0110’s since you’ll be using it in a high-temp environment and a small fan will definitely help.
Tony AC9QY
I have a working QDX, REV-5 pcb, low band and would like to make it more bullet proof with the LTN20069 heatsink and 4 of the TN0110 transistors. I haven't seen any pictures of that. Are there some anywhere? My understanding is that I remove the BS170s and insert the TN0110s, but when folded down, would present their flat faces upward, on which the LTN20069 would lay, complete with a 3mm hole in the center to sandwich it all together. I have a teensie 12v fan to sit on top of the case, with proper holes in it.
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I need more robustness due to using the QDX in the car, which can get hot. The TN0110s allow for higher voltage use, but I stick to 11.1V batteries because mobile antennas for HF whip around and the swr varies, adding further heat on the finals.
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Any errors in my plan? I'll post pictures when I'm done.
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Tnx,
W7LS
