- Jan 1, 1970
Anyone know of a Freq Synthesizer chip that can be used for the ISM band
(40.660-40.70Mhz). We may have an application where we will need to roll
our own TX/RX.
Since this is a low volume product (a few hundred a year) I would prefer
to find a low power off the shelf TX/RX set in this range if anyone
knows of any.
There are dozens of PLL synthersiser IC's that could be used
along with a bunch of extra bits.
You need to give more detail to get sensible answers.
How many frequencys within that band do you need?
FM? Some other modulation scheme?
Do you want to send analog or digital signals?
For a single fixed frequency with a typical varactor diode
FM modulator and superhetrodyne FM receiver it may make
sense to use a couple of crystal oscillators instead
of a synthersiser.
RF takes experiance to get things to work well.
Being a bodger at heart for 40Mhz I'd be considering
buying a load of basic 27Mhz CB radio's, adding
a little board with a couple of crystal oscillators
for TX and RX LO and changing about a dozen
capacitors. Guessing from the retail prices
CB radios must be available wholesale for about 5$
each. Not ideal if you have portable use in mind.