10 Feb 2011

4m QRP transverter progressing well

4m QRP transverter (so far)
Today I got on with the 4m transverter build adding the TX LO buffer, the TX mixer, drivers and PA. Output power is around 2-3W pep from an MRF237 PA device (SD1127 equivalent) I had in the junk box. All seems stable and well. All that now remains is to add the TX-RX switching circuit and put it in a box. At the current rate of progress, and barring disasters (like blowing up the PA - my last MRF237) the project could be completed next week.
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4 comments:

  1. AnonymousThu Feb 10, 06:02:00 pm GMT

    Well done Roger

    Are MRF237's i easy to obtain?
    You should manage a good signal all over
    Cambridge with 2 to 3 watts.

    Kind regards

    Tony

    ReplyDelete
  2. Roger G3XBMThu Feb 10, 06:06:00 pm GMT

    Tony, I'm not sure about the availability of the MRF237 and just used it as it was in the junk box, as was the ZTX327 driver.

    ReplyDelete
  3. Roger G3XBMThu Feb 10, 06:11:00 pm GMT

    Tony, the MRF237 is equivalent to the SD1127 and these are available on eBay.

    ReplyDelete
  4. AnonymousThu Feb 10, 07:23:00 pm GMT

    Thanks for the tip Roger.
    All the best with your on air testing

    KR Tony

    ReplyDelete