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Microwave detector questions
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.. 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 |
#2
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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 |
#3
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"Frank Dresser" wrote:
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/ 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 -------------------------------------------------------- I have given up on the shottky diode and forward bais, see my way to long post on improving audio. I am going with a precision rectifier built with 10MHz Video opamps. I hve decided to leave the existing detection and audio chain in place and add an IF buffer to feed an external detector "strip" Terry |
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