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40 meters - 100 watts




 
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Author Topic: 40 meters - 100 watts  (Read 315 times)
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ka1tdq
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« on: July 04, 2018, 10:30:20 PM »

I'm starting another class E transmitter.  Here's the picture of progress so far. 

It'll be two FETs in parallel for 100 watts carrier on 40 meters.  I decided to go with an ATC capacitor for the shunt this time.  It makes things more compact.

Jon


* IMG_1063.jpg (3179.32 KB, 4032x3024 - viewed 66 times.)
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ka1tdq
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« Reply #1 on: July 06, 2018, 11:03:22 PM »

I need to remove the assembly to mount the mica insulators (I can never find those when I need 'em), but this is how the heatsink will look.

Jon


* IMG_1069.jpg (2556.09 KB, 4032x3024 - viewed 38 times.)
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ka1tdq
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« Reply #2 on: July 07, 2018, 06:55:30 AM »

The heat sink assembly is now all done.  The rest of the work is just brute force chassis assembly. 

Jon


* IMG_1070.jpg (3485.46 KB, 4032x3024 - viewed 48 times.)
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steve_qix
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« Reply #3 on: July 13, 2018, 02:21:16 PM »

You may be better using one driver per MOSFET and not putting the gates in parallel.  I have had much success with such a design.

Watch out for parasitics.  Resistors in series with the driver inputs will help.

Keep us informed as to your progress!
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