Fisher Price Baby Monitor. Frequency?

[terryS]

Two units both powered by 6 volt wal warts; the portable end can also
use a 9 volt battery. Two channels. The portable unit has the number
71565; apart from that appears complete absence of any numbers, model
or otherwise!
Any idea what frequency these operate on? Frequency or any warnings
that might give a clue, not marked anywhere on box or units!
Acquired used; if there ever was an instructions leaflet there are now
none, other than printed on the box itself.
Thanks for any info. Terry
PS. Ah just found, marked on one of the end flaps of the box is "ID.
71565-0810". That's all.

 

[Ecnerwal]

Any idea what frequency these operate on? Frequency or any warnings

Most of those things are ~49 MHz IIRC - stick an antenna on a frequency
counter and stick it close to the transmitting end?

 

[T]

Two units both powered by 6 volt wal warts; the portable end can also
use a 9 volt battery. Two channels. The portable unit has the number
71565; apart from that appears complete absence of any numbers, model
or otherwise!
Any idea what frequency these operate on? Frequency or any warnings
that might give a clue, not marked anywhere on box or units!
Acquired used; if there ever was an instructions leaflet there are now
none, other than printed on the box itself.
Thanks for any info. Terry
PS. Ah just found, marked on one of the end flaps of the box is "ID.
71565-0810". That's all.

Baby monitors can be found in the same bands as cordless phones. 49MHz
is old cordless frequency, while 900MHz and 2.4GHz seem to be the newer
ones.

The only departure I know about is DECT phones. Theyr'e around 1.9GHz.

 

[default]

Many thanks for the opinion. If anyone does have anything definitive
as frequency band (not the exact decimal) would be appreciated. I had
wondered if we were dealing with 406 mHz. or something!

There should be an FCC ID number that may give you more info if you
look it up on line - usually on the circuit board . . .

How about looking inside for a crystal?

49 MHZ - my scanner says