19 Sep 2009

500kHz TX transverter schematic

This is the schematic of my 500kHz QRP TX transverter (from 28MHz). The next steps are (a) to add a couple of relays and RF sensing so that I can use it as a full RX/TX transverter and (b) changing the output stage to an FET such as an IRF510 to increase the output to 5-10W from the 700mW currently.


Anonymous said...

Hi Roger,

Does this circuit also produce a 136kHz signal?

I really enjoy your blog.



Roger G3XBM said...

Yes, it should work equally well at 136kHz although the low pass filter values will need to be scaled down too. In the coming weeks I hope to do a test with it on 136kHz with a local station a few kilometres away.