Transmitter RF Circuit

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Canooski

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Reference Transmitter

I am trying to design a small pcb board with antenna that will emit a sine wave that some antennas can use as a reference. I am a little unsure of how to go about this or what is the best way?

Should I use a VCO with an amplifier or will this not give me the stability I need? I would also like to change between frequencies within the 902-928 ISM band when needed.

Instead of this should I use a frequency synthesizer where the output is amplifier?

I also looked at the MAX2900 part however it has a differential RF output which I am unsure of how to realize with a whip antenna.

Thanks
 

I need to make a transmitter circuit board that will attach to a drone and emit a constant sinusoid in the 902-928 ISM band. I would like to be able to adjust the frequency on occasion within this band.

Is the best way to realize this through a VCO and an amplifier or should I be looking at a synthesizer. I looked at the MAX2900 IC and thought maybe I could use this but it has a differential output and not sure how I would use this with the whip antenna I was planning on using.
 

Anything specific I should know about Baluns? I will just hook this up to the MAX2900 differential ports and attach an attena on the other side of the Balun. Any circuitry in between these. I might need an amplifier. Looks like there is a decent amount of loss from a Balun.

- - - Updated - - -

As stable as possible. I need to make phase measurements from this reference signal.
 

1ppm is too tidy tolerance, ,I think 5 ppm is enough for this project.
 

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