Maker Pro
Maker Pro

Frequency standard

D

David L. Jones

Jan 1, 1970
0
Darn! Now you won't know when the next blackout due to the network
being overloaded is going to happen. :)

Guess I'll have to work on a running average or something, I think
it's currently about once every year. Pretty darn good IMO.

Or perhaps I could make a divining rod out of some cryogenically
frozen oxygen free copper cable or something? :->

Dave.
 
D

David L. Jones

Jan 1, 1970
0
Thanks for the info, Michael.
Back then, Jim Rowe got the Australian Commonwealth Scientific and
Industrial Research Organisation (CSIRO) to do some precise measurements
of his TV-derived frequency standard.
They found that all the networks were very accurate, but a couple
were super-precise. Maybe it's all different now and GPS is the way to go?

GPS is the way to go now for sure.
Even Rubidium references come up cheaply on eBay these days.

Dave.
 
M

Mr.T

Jan 1, 1970
0
Bob Parker said:
Thanks for the info, Michael.
Back then, Jim Rowe got the Australian Commonwealth Scientific and
Industrial Research Organisation (CSIRO) to do some precise measurements
of his TV-derived frequency standard.

Strange considering Telstra maintained the Australian frequency standards at
the time, not the CSIRO.
Telstra has now given it away, but last I heard the CSIRO was not
interested. Didn't want to spend the money (the same reason Telstra gave it
away)

They found that all the networks were very accurate, but a couple
were super-precise. Maybe it's all different now and GPS is the way to
go?


Well the ABC-2 clock was running 1 hour and five minutes fast, (compared to
AEDT and their programs) most of Sunday morning. I wouldn't have too much
faith in them any more :-(

MrT.
 
P

petrus bitbyter

Jan 1, 1970
0
Michael A. Terrell said:
It may have taken longer for the frame store equipment to migrate
from type 'M' NTSC in the US to other countries. Want to have some fun?
Try synching two different brands of frame store to the transmitter
site's sync generator for live programming from two other cities. A one
degree phase shift was visible on air.




GPS derived 10 MHz lab standards are common these days. There was a
construction article on a website to convert a surplus rack mount cell
phone base station GPS receiver into a low cost lab standard.

--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida


Saw something like that at:
http://home.teleport.com/~oldaker/

petrus bitbyter
 
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