20 Oct 2011

2 countries worked with the 28MHz XBM10-2

Well, off to a good start today with a couple of QSOs with the 2 transistor XBM10-2 60mW 10m CW transceiver. Much to my surprise I got 439 from IT9QAU/QRP at 1547z today.  Distance was 1414km.

Then 599 (with chirp) from M0DRK, who is in the same village as me. So 2 DXCC countries worked already.  On receive, the oscillator will not always start in the latest circuit version in which I've reduced the component count by a further 2 parts (just 11 parts plus crystal and earpiece now).  Still, a very promising start for something so ultra-simple.

UPDATE 1850z 20.11.10: To get the oscillator to always start on RX, to get TX spot-on 28.060 with the right offset for RX I had to revert to the earlier design and put 2 parts back. The revised schematic is shown here. This IS such fun.

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4 comments:

  1. AnonymousThu Oct 20, 07:15:00 pm GMT+1

    Roger

    That's good going for 60mW From a simple transceiver.
    You should get across the pond when conditions are good.

    Tony

    ReplyDelete
  2. Roger G3XBMThu Oct 20, 07:46:00 pm GMT+1

    In the end to get the right offset between RX and TX and the TX spot-on 28.06MHz I've had to revert to yesterday's design with a couple of value changes. Well pleased with the results though.

    ReplyDelete
  3. gj7rwtFri Oct 21, 10:48:00 pm GMT+1

    Simpler than a pixie with better results. Well done Roger!

    ReplyDelete
  4. KlemensasWed Oct 26, 06:35:00 am GMT+1

    Awesome rig, Roger!

    73 Klemensas

    ReplyDelete