[time-nuts] 60 KHz Receiver
paulswedb at gmail.com
Tue Oct 5 22:57:32 UTC 2010
A couple of comments.
If loran c, I built the simulator for the transmitter and its available at
Index of /simloran <http://n4iqt.com/simloran/>
But I left out various wave shaping filters because there was no intent to
xmit on the air.
KISS principal after all its all of $29 maybe. But is very optimized to
preserve the accuracy of the 100kc signal and I did check its behaviors with
the real loran stations it matched very well.
Those filters also optimize ground and skywave propagation characteristics
not a problem when the feed is coax and the endpoint the receiver.
Good comments on spreadspectrum. I have to roll back up to the question
asked a while ago. Goals of the interest. From there what frequency might be
chosen and what method of delivery.
On Tue, Oct 5, 2010 at 6:32 PM, Magnus Danielson <magnus at rubidium.dyndns.org
> On 10/05/2010 03:17 PM, J. Forster wrote:
>>> The bandwidth of anything close to a Loran signal is a *lot* wider than
>>> any of the ham bands contemplated below 1 MHz.
>>> There's the minor issue of getting the power company to put in a cable to
>>> the house for your 1 Mw (capital M not lower case M) transmitter.
>> I was not contemplating a global navigation system. Just enough to get a
>> LORAN type timing, not navigation, lock over a few hundred mile radius.
> However, consider that a few of these transmitters if wisely used could be
> kept running by guys like us on electricity bills we could handle and
> provide a grid network. This way the navigation aspect could be embedded
> into the system and propagation delay be cancelled. Fixed location could
> then be used to provide multiple observations of time-indication.
> A particular aspect of spread spectrum is that we could have several
> transmitters on the same center frequency which has the benefit that
> equipment delays become common mode to a first degree. This is a benefit of
> GPS over GLONASS.
> Multiple carrier systems provide means for frequency diversity as well as
> dispersion observations.
> There is many options to consider for such a system.
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