19 Sept 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.

2 comments:

  1. Hi Roger,

    Does this circuit also produce a 136kHz signal?

    I really enjoy your blog.

    Cheers,

    Geoff
    ZL1BLZ

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  2. 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.

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