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.

4 comments:

Anonymous said...

Roger

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

Tony

Roger said...

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.

gj7rwt said...

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

LY3LP said...

Awesome rig, Roger!

73 Klemensas