Technical Topics > The RF Workbench

5 watt crystal oscillator transmitter

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makeRF:
@OZNRH Thanks for taking the time to sketch up the schematic improvements!  I would have replied sooner, but I was away for a few days.  I'll be trying all the discussed improvements soon.

Antennae:
Whoa, 5W, now you're talking! Its a lot more than your other transmitter.  The NS-40 is a CW transmitter that uses the IRF510 transistor. The instructions say their circuit is 95% efficient and the transistor doesn't get hot. 

Here's the web page with links at the bottom for the diagram:
http://www.4sqrp.com/NS40.php

makeRF:
I finally got around to improving this circuit, thanks to the suggestions posted on this thread:
http://makerf.com/posts/a-better-amplified-crystal-oscillator-transmitter

As I mention in my writeup, depending on the crystal oscillator used, I get anywhere from 1 watt to 20 watts out of this!  Some of those metal can oscillators can generate some serious power that the IRF510 amplifies greatly.  I'll be working on another oscillator stage for this circuit soon and dump the crystal oscillator for obvious reasons.

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