Hi
….. and MSF does not do the BPSK rock and roll. That *should* ultimately
improve your ability to reject MSF. How much improvement will depend on how
fast the fade rate is when you are trying for a signal.
Bob
On Jan 16, 2013, at 6:45 PM, paul swed paulsw...@gmail.com wrote:
Well the
Interesting info about a new developed Maser working at room
temperature:
http://www.nature.com/nature/journal/v488/n7411/full/nature11339.html
timeok
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I have two 'cheap' WWVB 'Atomic Clocks', both of which say they are 'locked'
and are about 2 minutes apart.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Burt I. Weiner
Sent: Wednesday, January 16, 2013 2:34 PM
To:
If the GPS receiver hardware itself is integrated then it would
require a separate firmware update which may not be possible. I know
one of my more recent Garmin receivers has separate firmware for the
integrated GPS receiver and the unit as a whole.
On Thu, 17 Jan 2013 09:22:55 -0500, Bob Camp
On 1/17/13 6:22 AM, Bob Camp wrote:
Hi
Most cheap GPS's these days have user friendly firmware update capability.
That's been true for quite a while. I'd be amazed if the higher end stuff
didn't make updates an easy thing. Bugs in GPS code are not exactly
uncommon.
The real issue is the need
Since the Arbiter showed no ability to compare the settings to internal
clock settings, it suffered permanent damage when it was exposed to the
exploit.
Permanent damage? As in components failed? No, I think a factory reset
would restore it to function.
You've apparently missed some of
On Thu, 17 Jan 2013 07:08:20 -0800, Jim Lux jim...@earthlink.net
wrote:
On 1/17/13 6:22 AM, Bob Camp wrote:
Hi
Most cheap GPS's these days have user friendly firmware update capability.
That's been true for quite a while. I'd be amazed if the higher end stuff
didn't make updates an easy
Hi
A lot of gear has holdover in the 8 to 24 hour range. If the attack broke
the receivers (as in some sort of NV storage corruption), you would need to
drive out and replace the gizmos in that time frame. Inventory and tech
manpower likely is set up for lightning events (a dozen maybe) rather
Paul,
I don't know if this will be of any help for your particular
situation, but several years ago I had a problem where my Spectracom
8170 would not lock. I checked and found that I had good, clean
signal at the input spigot and the voltage going to the antenna was
clean and correct.
Hi,
I've placed a couple FTS 4060 parts units on ebay if anyone has an
interest!
Thanks,
Corby
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At about the time WWVB announced switching the format, two of my clocks
- identical SkyScan units bought at about the same time 10 or so years
ago suddenly stopped synchronizing, too. If just one of these clocks
had a problem, I would chalk it up to a random failure - but two of them?
One of
After reading the 'antenna on the ground' comment and being suspicious of
the 'upstairs' clock, I brought it down stairs, placed new batteries, and
sat it on the window ledge with the antenna 'broadside' to the west. I then
went to the shop to putz around for a while. After about an hour, I came
I've got to make a very clean 10.0594... MHz VCXO for a redo of one
of my old circuits. I previously used a 10 MHz ceramic resonator, which
was easy enough to push around in frequency. Of course, I have a couple
dozen of those somewhere, but can't find them now that I need them
again. I
Ed Breya wrote:
I've got to make a very clean 10.0594... MHz VCXO for a redo of one
of my old circuits. I previously used a 10 MHz ceramic resonator, which
Forget about it. This is well beyond even the lunatic fringe of pulling.
Rick
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You'll never pull a crystal that far without grinding :).
Regards,
Tom
- Original Message -
From: Ed Breya e...@telight.com
To: time-nuts@febo.com
Sent: Thursday, January 17, 2013 6:38 PM
Subject: [time-nuts] How far can I push a crystal?
I've got to make a very clean 10.0594...
Forget about it. This is well beyond even the lunatic fringe of pulling.
So how far can I pull a crystal?
Does it depend upon the cut or anything that turns into price?
--
These are my opinions. I hate spam.
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My friend Karl-Heinz DJ7NN has dragged/jerked/teared/wrenched crystals
even more (what is the most nasty description of pulling a quartz
crystal?) - if need be, he opens it and strikes a brush over it to
carefully grind some material, what makes it oscillating a little
faster. If you've
If you need a very clean signal - what would mean, stable (and
accurate) you'll have to purchase one. There are manufacturers that do
the job for, say, 30 Dollars? if it is a normal cut. If you like to get
a crystal for a specific temperature to build your own oven (to achieve
a very stable
Hi
You can always use a crystal as a capacitor in just about any oscillator
circuit. The question becomes at what point does it stop doing anything other
than behave like a capacitor.
The accurate way to figure this out is to know the motional capacitance of the
crystal. From that and the C0
Here an example manufactorer in my country:
http://www.quarztechnik.com/eng/hochfrequentequarze.html
or
http://www.icmfg.com/
Am 18.01.2013 01:31, schrieb Volker Esper:
If you need a very clean signal - what would mean, stable (and
accurate) you'll have to purchase one. There are
Hi Ed,
I seriously doubt you will be able to pull the 10 MHz crystal tht far off.
International Crystal Manufacturering (ICM)
http://www.icmfg.com/
still makes crystals for a reasonable amount (about $25) cut to order. That may
be far easier than all the time you would spend bending and
Issue is any system that phase locked will not and then not decode
Mobile so can't go into detail
Paul
Wb8tsl
On Thursday, January 17, 2013, Clint Turner wrote:
At about the time WWVB announced switching the format, two of my clocks -
identical SkyScan units bought at about the same time 10 or
Tnx hav data
Trvling
On Thursday, January 17, 2013, Burt I. Weiner wrote:
Paul,
I don't know if this will be of any help for your particular situation,
but several years ago I had a problem where my Spectracom 8170 would not
lock. I checked and found that I had good, clean signal at the
Hi
Mouser shows 16 items tighter than +/- 20 ppm accuracy. Six of them are in
stock and less than $1 in single piece quantities. The cheapest is 39 cents.
Bob
On Jan 17, 2013, at 7:38 PM, WB6BNQ wb6...@cox.net wrote:
Hi Ed,
I seriously doubt you will be able to pull the 10 MHz crystal
Bob, are you saying they have 10.059 MHz crystals? I've never seen
one anywhere, or anything even close.
Ed
Hi Mouser shows 16 items tighter than +/- 20 ppm accuracy. Six of them
are in stock and less than $1 in single piece quantities. The cheapest
is 39 cents. Bob
HI
Sorry, I mis-read the original post.
Bob
On Jan 17, 2013, at 8:09 PM, Ed Breya e...@telight.com wrote:
Bob, are you saying they have 10.059 MHz crystals? I've never seen one
anywhere, or anything even close.
Ed
Hi Mouser shows 16 items tighter than +/- 20 ppm accuracy. Six
Maybe I should clarify what I meant by pushing the crystal frequency. I
meant only using various topologies and electronic components in the
associated circuitry, that would detune it from its natural resonance
far enough to reach the new frequency, and still have it be sort of a
Having just adjusted a crystal oscillator at 10.715 MHz, I would hazard
a guess that the most one can easily pull a crystal of nominal frequency
around 10 MHz would be of the order of +/-1 kHz. Certainly not 60 kHz.
dr
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Ed Breya wrote:
Maybe I should clarify what I meant by pushing the crystal frequency. I
meant only using various topologies and electronic components in the
associated circuitry, that would detune it from its natural resonance
far enough to reach the new frequency, and still have it be sort of
Bernd Neubig wrote:
A parallel inductor for compensation of the static capacitance C0 does not
help much at 10 MHz, because such a coil, which resonates out a 6 pF
capacitance has an internal winding capacitance, which is larger than 6
pF.
So you would need a coil which has a self-resonance
Thanks all, for the feedback on this issue. In summary, I got these
points out of the discussion on crystals:
1. The correct terminology is pulling the frequency.
2. Getting beyond about a few hundred ppm from the nominal frequency
ranges from very difficult to pointless.
3. It's easier to
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