[time-nuts] question for expert time guys

Hal Murray hmurray at megapathdsl.net
Tue Feb 5 00:17:55 EST 2013


albertson.chris at gmail.com said:
> I think for best timing rather then use a "ping" Where the device gets a
> signal, waits then sends a reply it would be better to re-transmit the
> signal in real time.   So the base station send some waveform like carrier
> that is modulated by a saw tooth wave.   The remote device simply
> re-transmits the sawtooth wave but on a different carrier frequency.   Then
> the base station looks at the phase difference in the transmitted vs.
> received saw tooth.    ...

The OP said cost was important and that he was a software geek rather than a 
RF geek.

Can you re-transmit on a nearby frequency without blasting the receiver off 
the air?

There are low cost chips that send digital (RS-232 bandwidth) signals over ISM bands.  Are there similar chips that send an analog signal such that "phase" would be a sensible term?


-- 
These are my opinions.  I hate spam.





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