Jim Hampton wrote:
wrote in message
oups.com...
http://www.getboost.com/dz/sienna.htm

Hello, Jim

Greetings!

Well, how about a kit in the $100.00 range .....
with opposite sideband
rejection in excess of 50 dB.
Even a few hundred Hz away from the carrier?
Direct conversion. With selectable sideband. Hmmmm ....

Of course, it is a receiver. They do make an exciter.
But the thought of a
phasing direct conversion receiver or phasing transmitter
with sideband
suppression of that order is interesting. Especially since the lower audio
frequencies will also be highly suppressed.

Yep. Not a new idea, there was such a receiver in QST way back in the
early 1970s.

The problem is that it's not a $100 kit. You have:

- the basic R2 board
- the DSP board
- a VFO (probably DDS to generate the I and Q signals)
- the T2 board
- a housing and control system for the whole setup

*Each* of those will run you $100 or so if made from new parts.

And what you get is a QRP monobander. More bands and more power
will add considerably to the cost.

And pretty soon you wind up with something that costs as much
as an Elecraft K2/100.

I've got the QSTs referenced. All in the 1990s. Of course,
they've
replaced the analog audio quadrature generation with DSP to
obtain the
increase from 40 to 50+ dB suppression of the unwanted sideband.

Here is a URL:
http://www.wwc.edu/~frohro/R2_DSP/R2-DSP.html

Nothing like DSP.

50 dB unwanted sideband rejection on receive isn't *that* great,
though. The Ancient Ones did better a half-century or more ago.
But it *is* a neat rig.

N7VE's Tayloe Mixer was featured in a Red Hot Radio 30 meter CW
transceiver. But it's not available now, last I looked.

---

OTOH, a lot of rig can be built for $100 if you use other than new
parts from sources like hamfests:

http://hometown.aol.com/n2ey/myhomepage/index.html

73 de Jim, N2EY