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[aprssig] low power 2 meter exciter needed

Tyson S. timbercutter at yahoo.com
Thu Oct 5 04:38:38 UTC 2006


The Big Red Bee all ready makes an AFSK ready transmitter at 30
milliwatts.

http://www.bigredbee.com/BeeLineGPS.htm

--- Art <KY1K at verizon.net> wrote:

> 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.
> 
> It's for a stand alone 2 meter transmitter that can be used for 
> trackers and weather station APRS.
> 
> 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.
> 
> 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.
> 
> 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.
> 
> I'd rather not design multipliers myself, so I'm really hoping for a 
> ready made module or a simple to use chip.
> 
> Any ideas?
> 
> Thanks,
> 
> Art
> > 
> 
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Check out my APRS digipeater:
http://map.findu.com/FIELDR

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