Walkie talkie operation

C

Cass Lewart

Guest
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
 
"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
Click to expand...
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.
 
"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
Click to expand...
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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