I recently decided to conceive a 10W class 446MHz amplifier.

I want to be able to amplify a 100mW signal into a 10W, for that i'm going for a two stages amplifier :

  1. SKY65162 to amplify the signal to 1W
  2. Then a 2SK3075 to reach 10W approx.

Datasheets :

https://www.mouser.fr/datasheet/2/472/SKYS_S_A0006619433_1-2515303.pdf https://toshiba.semicon-storage.com/ap-en/semiconductor/product/mosfets/detail.2SK3075.html

The first amplifier is very well documented in the datasheet, but the second is more tricky. I have this datasheet which describes partly the circuit to make use of the transistor :

Schematic recommended by the manufacturer This schematic is supposed to describes the circuit required to function at around 500MHz. I was going to use theses values but I thought i could use some help and some tips from you.


What length shall be the transmission lines made like resistor on the schematic ?

Thanks for your help

  • 1
    $\begingroup$ 10W class 446MHz amplifier oh... in many, if not all, countries this would not be legal to use. Would you care to explain how you are planning to use this? $\endgroup$ Jan 10, 2022 at 10:55
  • 2
    $\begingroup$ For expérimentation mainly, but I'm not putting aside the many challenges. Power is not a problem for me, I'm allowed 200W $\endgroup$ Jan 11, 2022 at 6:55
  • 2
    $\begingroup$ "Do you have tips to spare?" is more a question for forum, not StackExchange. Do you have a more specific question? if so, please update your post above with that specific question. $\endgroup$ Jan 14, 2022 at 11:01
  • $\begingroup$ I hope you are also building a nice dummy load for this rig. $\endgroup$
    – user21417
    Jan 18, 2022 at 23:19
  • $\begingroup$ Thank you @jdv you're really helping me out on this one. $\endgroup$ Jan 19, 2022 at 13:39


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