Alberto,

Vernall wrote:
> The TVNZ nationwide network, with two Tv channels, has a Rubidium source

for

> timing.

In Italy, the state-owned TV broadcaster RAI has all its timings locked to

a central

Caesium standard, in Rome. Or at least so I have been told by a former RAI

employee.

I'm wondering if some simple circuit diagram is to be found somewhere, to

receive and

recover the synch timings, without using a real TV, bulky and noisy.

73
Alberto    I2PHD

Alberto,

The relatively simple circuits I am aware of need a good quality composite
video signal to start with, then use line synch pulses to phase lock a local
10 MHz oscillator.  There was a circuit in Radcom a couple of years back,
which seemed to be very similar to an Electronics Australia project from
1993.

The composite video could come from a VCR rather than a TV set.  Running an
actual TV set in the shack would generally be shooting oneself in the foot
for LF QRM :-(   Also you likely need much better than a piece of wet string
for the TV antenna, as noise or ghosting on the received video will not
result in a lab standard for the reference signal.

73, Bob