[time-nuts] Result of Earth Quake speeds up earth?
Magnus Danielson
magnus at rubidium.dyndns.org
Wed Mar 16 17:42:17 UTC 2011
On 03/16/2011 02:25 PM, jimlux wrote:
> Or, you can send a signal between the two stations by an RF link. If I
> recall correctly, you'd need to compensate for propagation variations,
> but, a two way scheme might work for that. I think I have a paper
> somewhere that talks about how they did that for VLA.
You need to either transmit at the same frequency alternating or
transmit at different frequencies, but dual frequency such that you can
compensate for any dispersion in order to aviod first grade dispersion
errors.
Also, care must be taken in calibrating the stations own contributions
to asymmetry. A de-tuned LC tank in the receiver path for one receiver
for instance shifts the delay asymmetrically.
But done with some care you should be able to get fairly good results if
you pick suitable frequencies, have line-of-sight and similar "good"
conditions.
Cheers,
Magnus
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