|
Rick
Campbell, KK7B's, modules and the QST articles
describing them:
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The R1
DC receiver: "High-Performance Direct-Conversion
Receivers",
August
1992 (online at http://www.arrl.org/tis/info/pdf/9208019.pdf).
You still need to read this even if you're interested in the R2
below.
The R2 single-signal direct conversion
receiver (a kind of
phasing SSB
exciter in reverse!): "High-Performance, Single-Signal
Direct-Conversion
Receivers", January 1993 (online at http://www.arrl.org/tis/info/pdf/9301032.pdf)
The T2 phasing SSB exciter: "A Multimode Phasing
Exciter
for 1 to 500
MHz",
April 1993 (online at http://www.arrl.org/tis/info/pdf/9304027.pdf)
Using these as a 2-meter microwave
transverter IF:
"Single-Conversion
Microwave
SSB/CW Transceivers", May 1993
The miniR2 RX board (smaller, less current draw) and
a
complete 1-watt
20 meter CW station: "A Small High-Performance CW Transceiver",
November
1995
The author revisits the noise figure
question: Direct-Conversion
Receiver
Noise Figure, in "Technical Correspondence," February 1996, and
describes
several significant and excellent mods! |
