wrote in message
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73 de Jim, N2EY


Hello, Jim

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.

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.


73 from Rochester, NY
Jim AA2QA

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