superhet rx homebrew
 

Hello. Im about 1/2 way through building the simple superhet rx in
doug demaws qrp notebook. (The brown covered one).
It uses a ca3028 mixer ic followed by a crystal filter and 1350 if
amps. Far Circuits sells a circuit board (which i purchased).
the main board is compact..about 4 inches by 3 inches.
Covers just one band..but you can use external converters to cover
other bands.
Let me know ..i could send you some info..jpg files i could scan.
Another good rcvr is the one in the ARRL handbooks ..it uses dual gate
mosfets ..I think its in the early 1990s handbooks.
73 Earl VE3AB

....[snip]....
ps - currently building the Ashar Farhan BITX20 20m ssb transceiver -
a lovely design, absolute miminal implementation of a complex device.

Yes, a really-nice design, but I just received email from Ashar saying
that he was correcting (LM386 pins 5 and 6 are reversed, for example)
and updating (to make it more sensitive?) the BITX20 article in a few
days, so you might want to wait or contact him directly.

--Myron.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)

....[snip]....
ps - currently building the Ashar Farhan BITX20 20m ssb transceiver -
a lovely design, absolute miminal implementation of a complex device.

Yes, a really-nice design, but I just received email from Ashar saying
that he was correcting (LM386 pins 5 and 6 are reversed, for example)
and updating (to make it more sensitive?) the BITX20 article in a few
days, so you might want to wait or contact him directly.

--Myron.
--
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)