[time-nuts] Alternate frequency sources - second opinions

[Stanley Reynolds]

The lack of low cost options to GPS is the point, loran as a backup is not as good or cheap, it is just the next best. WWVB is good if you are close that is you are in ground wave range. Loran depends on ground wave and can reject skywave some of this is made better via loran pulse nature. 

Maybe cheap cesium clocks will be on ebay soon, but I would not count on it as it takes a very long time to go from decommissioned loran station to ebay.


see table 2:
http://tf.nist.gov/timefreq/general/pdf/1305.pdf

Would indicate wwvb would be better than wwv for frequency or time. 

I have been playing with a wwvb DO but my location is marginal for reception.

Stanley



----- Original Message ----
From: Hal Murray <hmurray at megapathdsl.net>
To: time-nuts at febo.com
Sent: Sun, November 22, 2009 4:39:56 PM
Subject: [time-nuts] Alternate frequency sources - second opinions


Hockey puck (or mouse) type GPS receivers are available for under $100.

What can I get in that price range that doesn't depend on GPS?  I'm 
interested in millisecond accuracy as well as nanosecond.

Has anybody built a WWVB-DO?  (Time to dust off my WWVB toys.)

Is there some good WWV setup?


Somebody mentioned TV and radio stations recently.  (I think it was part of 
the North discussion.)

What sort of frequency source is at the root of the local TV or radio 
stations?

Is the sync timing for TV stations derived from the same source as the 
carrier?  Or are there two separate clocks to discuss?  How about the 
color-burst frequency?

What do radio/TV stations do for backups?  If there was a hurricane or 
earthquake that broke the main transmitter are they likely to switch to a 
backup with a different timing source?


-- 
These are my opinions, not necessarily my employer's.  I hate spam.




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