KX5X Archie Lamb's DDS SS-40 based Transceiver
Archie has combined the SS-40, a DDS VFO, a Transmitter strip into a 20M transceiver.
His description is below.
"It's a full transceiver wrapped around the SS-40 receiver. My station is not
set up to use separates very well so I put together this transceiver with
an Arduino controller and an 'offshore' DDS module, a DDS buffer / key interface
& control and a class E power amp for the transmitter. It works very well and I
enjoy using it. The Arduino has lots of memory left over so I plan to add the
keyer code I have working on other rigs (soon?).
I would encourage others to experiment - you never know what you might come
up with. That's part of what makes this hobby fun!"
Excerpt from Email to K8IQY and WAĜITP
Hi Jim / Terry,
Just a little FYI - don't know if you'll remember or not but a while back I
bought an SS-40 kit and after using it for a (short) while I got a wild hair
and added a DDS in place of the VXO. I then added a TX for what I called an
SS40xcvr. It was good but the TX was a little anemic. I just finished reworking
the final with a class E amp. It works great but doesn't throttle back to QRP
very well - I now get 20w with a single IRF510. I really like the rig!
Second item, Jim and I had a few exchanges about the SS40 on other bands.
I was so happy with that design that I went ahead and did a version for 20m.
(The photos below are of the 40M version - wa0itp)
I used what I had in the junk box so some parts details are different
(for example, I used 8MHz crystals for the IF) but the block diagram is
very much the same. With a DDS for frequency control and a bipolar TX I now
have a very nice 20m rig (this one IS QRP). Both rigs are a lot of fun to use!
Now all I have to do is decide if I need a 30m version? (;-)
Thanks a lot guys! (For both the design / kit and the inspiration)
Click any picture for a full size image.
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