wrote in message
ps.com...
Digging through my junkbox I found I have two Omni Spectra
20090 detectors that use Alpha D5326098 diodes. They measure
a Vf of 240mV compared to a "typical" GE which has a Vf of
358mV. I measured 3 In34 and 3 OA81C and they all matched
within a mV or so..
At what current? Don't take the textbook diode (Vf +R) model as
honest-to-gosh truth. Check out:
http://www.bentongue.com/7diodeCv/7diodeCv.html
This is from:
http://www.bentongue.com/
I couldn't find specs for the Omin Spetras, but I also
have a HP 8472B "crystal detector" that The specs say
"low barrier Shottky"". It also measures 240mV.
I can easily get the Omnis apart so they may become
sacrifed tothe greater glory of SW.
In my net searches I was a little shocked at how expensive
the microwave detectors are even used.
Terry
The precision rectifier seems like a pretty good idea.
This subject has gone around here a few times. Deja/google keywords as
Hi-Fi AM, Low distortion detector and such in rec.radio.shortwave and
rec.antiques.radio+phono.
Frank Dresser