To: time-nuts@febo.com
Subject: Re: [time-nuts] WWVB new modulation...
On 11/23/12 8:28 AM, Burt I. Weiner wrote:
I still have two of the Heathkit clocks, but alas, they won't work at
home because of my standards.
Burt, K6OQK
Are your equipment and interconnects leaking that badly?
Burt I. Weiner
and all my cables are Belden 8281. The D.A.'s are rack mount
and use plug in cards and are not that well enclosed.
Burt, K6OQK
From: Christopher Brown cbr...@woods.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] WWVB new modulation...
On 11/23/12 8:28 AM, Burt I. Weiner wrote:
I
There were several companies that made WWV clocks that worked by
recovering the 100 Hz time code information. ESE, who makes
broadcast related products, including clocks, was one. I remember
installing several card types manufactured by various companies that
worked in computers. I still
On 11/23/12 8:28 AM, Burt I. Weiner wrote:
I still have two of the Heathkit clocks, but alas, they won't work at
home because of my standards.
Burt, K6OQK
Are your equipment and interconnects leaking that badly?
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Are there any commercial products using this new phase-shift modulation
scheme?
Larry
On 11/3/2012 4:32 PM, Charles P. Steinmetz wrote:
This has probably already been posted more than once, but if anyone is
still looking for a description of the new WWVB modulation scheme:
It depends on what you mean:
First off, the phase modulation renders many existing phase tracking
receivers useless. Period.
A few current receivers are immune to the PSK, but they do not 'use' the
PSK modulation, but they just ignore it.
My understanding is, the new modulation was designed
I realize this modulation scheme change is perceived as a sensitive
subject. But, really, since the full scheme is fully disclosed no
company has a monopoly on its use. My question is, will this new scheme
offer enough advantages to merit the production of commercial equipment
to use it, and
On 11/22/12 12:12 PM, Larry McDavid wrote:
I realize this modulation scheme change is perceived as a sensitive
subject. But, really, since the full scheme is fully disclosed no
company has a monopoly on its use.
Actually, I think the developing company does have patents on some of
the
I believe they have a design that is working in silicon.
If so, that's a $ million or more head start. That, to me, is a monopoly
because any other entrant to the market would have to amortize that
expense.
Furthermore, there is the issue of patent suits, even if you can design
around their
jim...@earthlink.net said:
Actually, I think the developing company does have patents on some of the
receiver implementations. You can probably design around them.
What's the fine print in this area? Does NIST have any PR blurbs covering
patents?
Common sense, politics, and patents makes
Hal,
It is worse than that ! John P Lowe, Broadcast Manager for NIST, stated to me
that HE was the person who invented the new modulation scheme. If that is the
case then it belongs to all of us. AND that is, precisely, why they are
publishing this modulation scheme.
What I find interesting
This has probably already been posted more than once, but if anyone
is still looking for a description of the new WWVB modulation scheme:
http://tf.boulder.nist.gov/general/pdf/2651.pdf (Sept. 2012)
Best regards,
Charles
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- Original Message - From: Chuck Forsberg WA7KGX N2469R
c...@omen.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt
@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500 radio, Racal-Dana counter, Advantest Spectrum
analyzer and Gigatronics signal generator.
You might be interested to know KEX 1190
- Original Message - From: Chuck Forsberg WA7KGX N2469R
c...@omen.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt along with a
Flex
measurement
time-nuts@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500 radio, Racal-Dana counter, Advantest Spectrum
analyzer and Gigatronics signal generator.
You might
- From: Chuck Forsberg WA7KGX N2469R
c...@omen.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500
WA7KGX N2469R
c...@omen.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Friday, October 26, 2012 12:14 AM
Subject: Re: [time-nuts] WWVB New Modulation scheme...
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500 radio, Racal-Dana counter
measurement
time-nuts@febo.com
Sent: Sunday, October 21, 2012 11:08 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator /
carrier regenerator ?
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz
If I sent these thoughts before, pardon me as I'm suffering from CRS Syndrom.
Part of the normal work I provide is off-air measurements of
broadcast stations. Would you believe, they pay me to do
this! Anyway, I measure AM carriers, FM carriers, and TV, both
analog and digital pilots, as
I have my 3586b slaved to my Thunderbolt along with a
Flex-1500 radio, Racal-Dana counter, Advantest Spectrum
analyzer and Gigatronics signal generator.
You might be interested to know KEX 1190 in Portland
is about 30 kHz low. At least they aren't spewing
IBOC lately.
--
Chuck Forsberg WA7KGX
of precise time and frequency measurement
time-nuts@febo.com
Sent: Sunday, October 21, 2012 11:08 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz
if any of this is really
real.
Dale NV8U
-Original Message-
From: paul swed
Sent: Monday, October 22, 2012 10:29 PM
To: Tom Miller ; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
I
Dale -
To your question re BPSK and DPSK. In both modes the phase shift is 180
degrees.
Straight PSK has the issue of determining the 1's from the 0's, at the
receiver as there is
no phase reference.
To avoid this DPSK encodes the the serial data stream prior to the
bi-phase modulator.
As I
of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz BPSK. (I
built a simulator) It did not track
On Mon, Oct 22, 2012 at 02:16:19AM -0400, johncr...@aol.com wrote:
Dale -
To your question re BPSK and DPSK. In both modes the phase shift is 180
degrees.
Straight PSK has the issue of determining the 1's from the 0's, at the
receiver as there is
no phase reference.
To avoid this DPSK
myself.
I'll probably have mine just toggle the phase every 100 ms initially.
Dale
-Original Message- From: paul swed
Sent: Sunday, October 21, 2012 11:08 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, October 22, 2012 8:35 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
To switch
, October 22, 2012 8:35 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator /
carrier regenerator ?
To switch correctly at the zero point I sample the plus of the secondary
with a LM339 comparator (only using 1 section) and feed that to a SXB micro
running at 40 Mhz. Detect
While looking for other stuff I came across the data sheet for the NXP
Semi SAA6579.
The chip is a purpose built demodulator for RDS (which utilises a 57 KHz
ABPSK subcarrier on FM broadcast that is) used for traffic, song info
etc. This chip has an anti-aliasing front end low pass filter and
Because it use differential BPSK. I have a number of them and was trying
it. There is a test pin that might make it useful.
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 9:14 PM, Dale J. Robertson d...@nap-us.com wrote:
While looking for other stuff I came across the data sheet for the NXP
Semi
Hi Dale:
Is it as simple as changing the clock to operate at 60 kHz?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Dale J. Robertson wrote:
While looking for other stuff I came across the data sheet for the NXP Semi
SAA6579.
The chip is a
Paul,
I'm trying to understand your reference to 'differential BPSK' all the RDS
references I've looked at indicate a 180 degree phase shift just like WWVB. I'm
thinking that differential and antipodal are just different words for the same
thing
Regards,
Dale
Sent from my iPhone
On Oct 21,
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz BPSK. (I
built a simulator) It did not track and in general produced noise. I
understand you can use 2 frequencies to drive it and I tried both from
synth gens.
I was
Paul,
Did you move the frequency up by driving it with a function generator or by
using a 4.56 or 9.12 MHz crystal? I'm thinking that maybe the quadrature phase
lock is accomplished by an internal varacter or some other mechanism for
'pulling' the on-chip oscillator. That wouldn't work if you
I guess that will mean that my bullet proof Tracor 599J will become a paper
weight. I have a couple of units that were surplussed years ago from the
USNO. Great receivers.
Sam
W3OHM
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