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<tt>I need a simple, low cost and relatively inexpensive exciter (single
frequency) for 2 meters, and was wondering if users here might have any
ideas. I want it to take an 18 Mhz quartz crystal input and output 10 to
30 milliwatts at 144 Mhz.<br><br>
It's for a stand alone 2 meter transmitter that can be used for trackers
and weather station APRS.<br><br>
There are some user programmable oscillators that are suitable for clock
drivers in microprocessors, they are not suitable, to much jitter and are
not stable enough to stay on the same frequency.<br><br>
A PLL chip is ok, except that any chip I found takes a lot of support
circuitry (outboard divide by N counters and/or vco's), and they all need
a microprocessors to talk to the chip to determine it's divide by n
value.<br><br>
Maxim has some low power transmitter chips, but they are unsuitable
because the vco is built in and cannot oscillate at 2 meters (they will
only oscillate from 300 to 500 Mhz)... Unfortunately, they did not bring
provisions to the outside world for allowing the user to change the vco's
frequency of operation.<br><br>
I'd rather not design multipliers myself, so I'm really hoping for a
ready made module or a simple to use chip.<br><br>
Any ideas?<br><br>
Thanks,<br><br>
Art<br>
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