On 2/18/15 1:49 AM, Attila Kinali wrote:
You could try tinyVNA[1]. I have used it once, it has some quirks
(it's half hobby, half commercial project and that shows) but works
otherwise. I have no idea how accurate it is.
Attila Kinali
[1]
Am I wrong or are all the older WWVB frequency standard receivers
obsolete?
My understanding was that since the transmitted format changed the
receivers wont lock.
I asked an eBay vendor about that since they are still asking big bucks.
The reply was Ive heard that before, but certain people still
Yes. I had the same issue with several of my 1250s. Unless you intend to use it
through a power outage, just disconnect the batteries and all should be fine.
It will also be a lot lighter if you take them out. Regards - Mike
Mike B. Feher, EOZ Inc.
89 Arnold Blvd.
Howell, NJ, 07731
I own several of these units, and have for sale several more if anyone is
interested. I can verify that a New Old Stock unit straight out of the box,
needs to have the cover removed, and a piece of Styrofoam spacer removed from
the relay you mention. It sounds like you have done that, or the
Hi Ole Mmmm well I have 2 and a friend has one all had dead batteries,
quickly removed, but we didnt have a manual then so we just ran them without
them batts. Our power is quite reliable. My pair have been running
continuously for around 7 years now with no signs of problem and no relay
There is a Spectracom Technical Note discussing this [TN13-101(A),
dated March 12, 2012]:
http://www.spectracomcorp.com/Desktopmodules/Bring2Mind/DMX/Download.aspx?EntryId=963PortalId=0
or
On Tue, 17 Feb 2015 18:33:24 -0800
Tom McDermott tom.n...@gmail.com wrote:
Hi Dave - agree that VNA is one good way to measure the delay. If required
accuracy is less than about
0.5 nsec, then Tx antenna to Rx antenna mutual impedance starts to become
an issue. Above about
1 nsec error
Corby
A rare day when I can answer one of your questions. Usually the other way
around.
All of the phase tracking receivers will not lock to the new BPSK format
without considerable modification. I have release a few to time-nuts here
in the past.
They involve costas loops and frequency doubling
HI Tom...
Good to see you getting into Time-Nuttery!
How accurately do you need to know the delay? For absolute time, it is
important, but it doesn’t really help much with position since the calculation
doesn't know which direction your receiver is located from the antenna. For a
time-base it
Corby,
As have been discussed before, you need to upgrade them to have a Costas
loop to wipe off the phase-modulation code. If you dig the archives, you
can find the references.
I agree that it's a bit silly to ask big bucks for a box which at best
needs a modification to operate. It's not
Hi Corby:
The new format was designed to be compatible with the existing atomic clocks
that use the AM time code.
The problem comes with frequency standard receivers that make use of the
carrier phase.
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
From the WWVB web page http://www.nist.gov/pml/div688/grp40/wwvb.cfm :
Enhanced WWVB Broadcast Format Change
Since October 29, 2012 at 1500 UTC (9:00 AM MDT), NIST Radio Station WWVB has
been broadcasting a phase modulated (PM) time code that has been added to the
legacy
Hi:
One of the chirp receivers I worked with was connected to the audio output of a
shortwave receiver.
Since chirp transmitters sweep frequency (typically 2 to 30 MHz) you don't tune in the frequency domain but rather in
the time domain and compare to a GPS based 1 PPS.
This time difference
Ole
I will guess that without the pack the bus voltage may go high and that
they also used the pack as a filter cap. So you should be able to find a
free manual on one of the sites. KO4BB is a good guess. It may be as simple
to start as a 10,000 uf cap to get going. The oscillating relay may be 60
Hi
By far the simplest way to do this is to use a broadband passive antenna with a
short cable. They
are a $10 item on the auction sites. Compare whatever comes out of the GPS
running off the cheap antenna to your
“full system” pps offset. What you are doing with this comparison is no
thol...@woh.rr.com said:
How accurately do you need to know the delay? For absolute time, it is
important, but it doesnât really help much with position since the
calculation doesn't know which direction your receiver is located from the
antenna.
GPS tells you the location of the
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