samedi 26 juillet 2014

How accurate does tuning have to be on FM?

I'm thinking about getting an MT500 or an HT220 and crystaling it for one of the wide-area repeaters in Houston as a battery-miser backup/emergency rig. Only draws 11 mA squelched!

Channel elements were available in 10PPM and 5PPM accuracy. 10PPM equates to ±1.4 kHz on 2m.



Is that close enough to work with 5 kHz deviation, or do I need to hunt down a 5PPM channel element? I don't have any concept of how accurate a modern synthesized HT is; I may be worrying about nothing.




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