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#11
July 18th 07, 09:42 PM
posted to sci.electronics.basics,rec.radio.shortwave,rec.radio.amateur.antenna,alt.cellular.cingular,alt.internet.wireless
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AM electromagnetic waves: 20 KHz modulation frequency on an astronomically-low carrier frequency
Michael A. Terrell wrote:
isw wrote: That particular receiver doesn't have much of a "front end"; diodes (with protection) and straight into the first mixer. No RF stage, tuned or otherwise. It can exceed the PIV of the protection diodes and cause them to short, or explode. That crappy Sony design is where the harmonics came from. The diodes, (or any other semiconductor) with enough RF can generate a lot of spurious signals. It can even come from a rusty joint in the area. Is the ICF-SW7600GR significantly better performing than the ICF-7600D on this? gr, Hein |
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