In article ,
"amdx" wrote:

--
MikeK
"Graeme Zimmer" wrote in message
...
Hello Mike,

If you Google on "Synchronous AM Detector" and "Exalted Carrier Reception"
you'll find lots of info

This is good place to start....
http://www.radio-electronics.com/inf...t/sync_det.php


Regards ............ Zim
Thanks Graeme,
I'm thinking about building the mixer that was in QST Feb., 1993, an
article by
Jacob Makhinson. Titled, "A High-Dynamic-Range MF/HF Receiver Front End"
The mixer uses a quad FET IC, (Si8901 from Calolgic corp.)
The only online reference that I can find is here; See pdf pages 26 (text)
27 (schematic)
http://files.bluecrow.net/Amateur%20...ok_2007/11.pdf
The front end is designed in three modules, preamp, mixer, and post amp.
Anyway I'm thinking about building the mixer and playing with it in the
AMBCB.
Even thoughts about building an I/Q receiver.
Mike
(Note; I do more thinking than building ;-)

You should look at the Northern Radio Model N570/571 Marine SSB Radios,
that were designed and built back in the Early 70's. They used at rather
unique design with a Double Balanced Mixer at the Receive Antenna Port,
that moved the IF up to a low VHF biDirectional Amp and Filter, and then
back down to a 10.7 Mhz IF with another Double Balanced Mixer, and on to
the Crystal SSB Filter, and Demodulator. The Double Balanced Mixers were
driven by an LO System that canceled out any Frequency Drift, by using
opposite Mixing Images.