Hello all...
One limitation, back in the day, when the network
signal was being passed thru to the local markets...
Many stations used a frame sync to time the network
signal to the local house signal. In other words the
network reference was stripped and retimed to the
house so as to avoid
> As noted earlier, color burst references were a big deal a long time ago.
Thanks. I was fishing for something modern, maybe a bit clock out of the
digital receiver.
I'm assuming that the digital stream is locked to the carrier. That may not
be correct.
--
These are my opinions. I hate s
Am 31.03.2018 um 00:13 schrieb Hal Murray:
fgr...@otiengineering.com said:
Now that analog TV has gone away, so
have these signals.
What do the local TV stations use for a frequency reference?
Are there low cost receivers that also produce a good reference frequency?
The German channel
Hello to the group.
Been staying clear of the thread as many good comments.
Several things happened that made the color burst signal useless for most
people.
Yes the networks had Cesium's about 3 of them at CBS and the network feed
carried that quality.
but about 1980 a device called a frame synchr
On 3/30/18 5:52 PM, Bob kb8tq wrote:
Hi
On Mar 30, 2018, at 6:13 PM, Hal Murray wrote:
fgr...@otiengineering.com said:
Now that analog TV has gone away, so
have these signals.
What do the local TV stations use for a frequency reference?
Anything from a crystal oscillator to a Cs st
It might of been fairly easy to use an old NTSC television signal as a
frequency reference (lumina, chroma or audio carriers). Now that it is
converted over to ATSC it would be much more difficult to recover a
reference frequency using readily available electronics.
You would have a much better ch
Hi
> On Mar 30, 2018, at 6:13 PM, Hal Murray wrote:
>
>
> fgr...@otiengineering.com said:
>> Now that analog TV has gone away, so
>> have these signals.
>
> What do the local TV stations use for a frequency reference?
Anything from a crystal oscillator to a Cs standard. It’s very much a “
fgr...@otiengineering.com said:
> Now that analog TV has gone away, so
> have these signals.
What do the local TV stations use for a frequency reference?
Are there low cost receivers that also produce a good reference frequency?
--
These are my opinions. I hate spam.
Hal Murray (hmur...@megapathdsl.net) said:
"Roughly 40 years ago, a friend showed me a NBS booklet describing a scheme
for distributing time via TV. I forget the details. It was a cooperative
project with one of the major networks. NBS published the propagation delays
which changed occasionally
Hi Brooke --
Yes, all the chips on the board are low power devices. I'm measuring
the receiver as drawing 0.9 MA at about 2.3 volts.
Update -- I moved the receiver and farted around with the wiring, and
now the S-Meter is off the peg, responds to orientation changes, and I
actually got a co
Hi John:
The U4226B chip operates at very high impedance levels in order to minimize battery drain in its main application,
battery powered clocks.
So some sort of buffer is needed on all the output pins.
The 333 model, with the analog meter, was made for the folks working for WWVB as a way fo
Hi
> On Mar 30, 2018, at 12:42 AM, Hal Murray wrote:
>
>
> jim...@earthlink.net said:
>> Hal, you should know better than to have a question like "get time" on this
>> list without specify the precision and accuracy .
>
> I was thinking of measuring the results, and maybe comparing vario
Hi, I modified my RTL-SDR by adding a blue LED on one side of the crystal.
This helped a bit but there is still a little variation with temperature.
Anyone else run into this problem?
It seems spot-on when checked against available standards but lack an atomic
reference.
-Andre
_
On 03/30/2018 03:39 AM, Hal Murray wrote:
t...@leapsecond.com said:
I updated http://leapsecond.com/museum/ulio/ with more manuals, and many
exterior / interior photos of the 301 module.
Thanks. My 301 says it is a 30TH Rev-A - mostly through hole parts. Same
layout.
Mine is the same. Cir
t...@leapsecond.com said:
> In general, if the author or paper is related to NIST, the original
> copyright-free PDF will be available in the NIST Time and Frequency
> Publication Database. That easily searchable database, and the thousands of
> papers it contains, is probably the greatest asset w
t...@leapsecond.com said:
> I updated http://leapsecond.com/museum/ulio/ with more manuals, and many
> exterior / interior photos of the 301 module.
Thanks. My 301 says it is a 30TH Rev-A - mostly through hole parts. Same
layout.
--
These are my opinions. I hate spam.
__
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