I have found references saying the MC13175 can do as low as 50MHz.

On 3 Oct 2006 at 12:11, Art 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.
> 


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