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Sci.Electronics.Basics -> Walkie talkie operation
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Author: Cass LewartDate: 10:18 11-05-08
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I have an inexpensive walkie talkie (under $50/pair). It receives
FRB in 400 MHz and weather stations in 160 MHz region. It is both
sensitive and selective. I can not find any schematics also I do not
see any IF teransformers. Is it a superhet and if not how do they
achieve such great performance in a TRF design?
Cass
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Author: Bob EldDate: 10:35 11-05-08
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"Cass Lewart" <rlewart@shell.monmouth.com> wrote in message
news:g06v87$1mc$1@news.monmouth.com...
> I have an inexpensive walkie talkie (under $50/pair). It receives
> FRB in 400 MHz and weather stations in 160 MHz region. It is both
> sensitive and selective. I can not find any schematics also I do not
> see any IF teransformers. Is it a superhet and if not how do they
> achieve such great performance in a TRF design?
> Cass
If it is a modern design, it is highly integrated maybe even a single chip
receiver. It surely is superhet, maybe even double converted. The IF is
probably 10.7MHz and likely uses a crystal or ceramic resonator, not IF
transformers.
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