On 21/06/11 12:48, Luis Cupido wrote:
Yes that right. Is clear that I would have a 10ns jitter,
So the catch would be to find a scheme to spread spurs out or to push
them away from carrier. Then they would not bother me (would not pass
the PLL).
You want to consider a phase-accumulator with a
Magnus,
It crossed my mind of messing somehow with the phase
accumulator metrics but did not figure a way...
that is a good suggestion I will investigate in that direction...
(or maybe... if you do have a bit of free time to drop me
a couple of lines more, could you please detail
a bit more as
Dear Luis,
On 07/21/2011 05:30 PM, Luis Cupido wrote:
Magnus,
It crossed my mind of messing somehow with the phase
accumulator metrics but did not figure a way...
that is a good suggestion I will investigate in that direction...
(or maybe... if you do have a bit of free time to drop me
a
IMHO, that would require a sine table with a steerable number
of entries. Very problematic for a tunable DDS, but doable
for a fixed frequency application, although address mirroring
for ROM size reduction would require real address comparators
instead just using the 2 MSBs as a selector.
The
Hello,
I have a PRS10 rubidium which gives a 1pps output. The output is a 10 us
positive pulse.
I need to convert that to a 50:50 duty cycle pulse. Still 1pps.
I'm hoping for a simple circuit rather than having to use a pic.
I don't mind a bit of propagation delay, but I need to preserve
Gerhard.
This was an old thing I asked a month ago or so...
Only the MSB of the accumulator is used to serve
as reference to a pll. No sin or DAC involved ;-)
Luis Cupido.
ct1dmk
On 7/21/2011 6:10 PM, dk...@arcor.de wrote:
IMHO, that would require a sine table with a steerable number
of
How close to 50% duty cycle do you need. is 0.50 good enough or do
you need 0.5 ? If all you need is 15% accuracy a 555 timer
set up to make a 0.5 second pulse would work but if you need better,
then maybe a phase lock loop with a much higher than 1Hz oscillator
and then you divide that
Your algorithm looks very much like the solution to the problem how to
find divider values in a rf receiver having a very low IF and *not* full
length divider chains for dividing all the needed reference frequencies.
So how to find two values connected.
Interesting.
- Henry
--
On 07/21/2011 07:10 PM, dk...@arcor.de wrote:
IMHO, that would require a sine table with a steerable number
of entries. Very problematic for a tunable DDS, but doable
for a fixed frequency application, although address mirroring
for ROM size reduction would require real address comparators
On 07/21/2011 07:48 PM, Chris Albertson wrote:
How close to 50% duty cycle do you need. is 0.50 good enough or do
you need 0.5 ? If all you need is 15% accuracy a 555 timer
set up to make a 0.5 second pulse would work but if you need better,
then maybe a phase lock loop with a much
Chris wrote:
How close to 50% duty cycle do you need. is 0.50 good enough or do
you need 0.5 ? If all you need is 15% accuracy a 555 timer
set up to make a 0.5 second pulse would work but if you need better,
then maybe a phase lock loop with a much higher than 1Hz oscillator
and then
On 07/21/2011 08:44 PM, Jim Lux wrote:
On 7/21/11 8:30 AM, Luis Cupido wrote:
Magnus,
It crossed my mind of messing somehow with the phase
accumulator metrics but did not figure a way...
that is a good suggestion I will investigate in that direction...
(or maybe... if you do have a bit of free
The PRS-10 already has a 10 MHz output locked to the 1 pps. Just count the
10 MHz.
I was working only with the information in the post that said only a
PPS was available. I was wondering how one would even use a PIC. But
if you have 10MHz then divide that down to 2Hz with decade counters.
Fellow Time-Nuts,
Since LORAN is now gone in North America, I needed a backup to GPS (belt and
suspenders man, me). I recently acquired a working Spectracom 8170 thus:
http://flic.kr/p/a4CYww
Using my ex-LORAN antenna (LF Engineering L-400B) it syncs in about 10
minutes.
Shaun
Hello,
I have a PRS10 rubidium which gives a 1pps output. The output is a
10 us positive pulse.
I need to convert that to a 50:50 duty cycle pulse. Still 1pps.
I'm hoping for a simple circuit rather than having to use a pic.
I don't mind a bit of propagation delay, but I need to preserve
So the next step is to power up an Austron 2042 using the 1 Mhz o/p from the
Spectracom 8170, thus:
http://www.flickr.com/photos/acme-laboratories/5948373640/
Shaun M.
No Regret (Since 1996)
___
time-nuts mailing list --
I live at 39° 57' 46 N and I absolutely HATE DST! Yes, Indiana... we
haven't had DST for too long. It's bad and I hope some day we go back to
not having it.
- Original Message -
From: Rob Kimberley r...@timing-consultants.com
To: 'Discussion of precise time and frequency
Last step is to let the Austrons (2100R and 2100F) lock to the new LORAN
inputs thus:
http://www.flickr.com/photos/acme-laboratories/5947818627/
and the 2100R:
http://www.flickr.com/photos/acme-laboratories/5963265512/
Shaun M
No Regret (Since 1996)
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