frequency standard from color TV signal?

Put this together with what Tom says, and you can get 3.579545454 * 88 / 315 =1 MHz, exactly. At one time it was claimed that on live network programs the frequency accuracy of the color burst was on the order of 10E-11. What you do is to divide the color burst frequency by 315, and then multiply it by 88 in a 1 MHz crystal controlled phase locked loop. Only problem with this is that it is goiung away in 2009.

Tam

I'm familiar with the frequency conversion but as a former NTSC TV broadcast engineer, I've seen a framestore at every transmitter site since the late '80s. That reduces your accuracy to roughly 10 MHz, +/-

27.93 Hz.

--
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

I can't remember exactly, but I think the article I was referring to was probably from the early or mid 80s. So much for progress.

Tam

The color burst was never intended to be used as an external frequency standard. OTOH, the framestore/proc amp cleaned and stabilized the video before transmission, and did improve picture quality.

--
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

1 pps may well be way to slow to be useful. Sure it will eventually get there, maybe in days. Only 86,400 ticks in a whole 24 hour day. Sure you can use deltas etc., but the result "real"?

--
 JosephKK
 Gegen dummheit kampfen die Gotter Selbst, vergebens.  
  --Schiller

Richard Henry wrote in news:1176828772.265733.52460 @b75g2000hsg.googlegroups.com:

That is if you want accurate clock time.

For just an accurate frequency reference, you only need receive a signal soerced from a cesium beam reference