[time-nuts] Need advice for multilateration setup

Attila Kinali attila at kinali.ch
Mon Apr 6 05:21:47 EDT 2015


On Sat, 04 Apr 2015 08:49:01 +0200
Magnus Danielson <magnus at rubidium.se> wrote:

> This is on either side of the amateur 23 cm band. That's also the first 
> band where you have bandwidth enough to fool around with stuff like this 
> without breaking the bandplan.

This shouldn't be much of a problem. Using a chiping rate of a couple
of kHz should be enough for this application. The signal strength
can be rather large, directive antennas can be used and the expected
noise level is rather low. So there no need to use a high chipping
rate to compensate for noise effects. Of course, using a higher
chipping rate makes it also easier to get an higher accuracy, but
I would start with something easy to do first, like a 100mW transmitter
in the 70cm band with 10kHz chipping rate (or go to a sub-band,
where 200kHz signals are allowed). With that kind of setup it should
be possible to use something like RTL-SDR for the first experiments
and then gradually upgrade to better hardware to improve accuracy.

			Attila Kinali

-- 
< _av500_> phd is easy
< _av500_> getting dsl is hard



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