Did anyone hear the report that NPR did on light squared earlier today. You
can probably find it on their website if you want to hear it. They seemed
to give a pretty good account, as good as can be expected in a couple or
three minutes.
Regards.
Max. K 4 O D S.
Email:
Unfortunately, my D525 mobo doesn't have a serial port and my symetricom
doesn't like the usb converter. One of these days somebody is going to
make a usb coverter that really looks like a serial port. I'm probably
going to buy a serial card for the box if all else fails.
Gary,
I found one
What OS have you been using? If it's windows, then blame the
windows usb serial driver. It's the biggest piece of sh*** i've
seen in a long time in the driver world. It is even able to
freeze the machine without blue screen. Reliably.
[]
Attila Kinali
Been running Windows XP SP3 here with a
Dissapointing - I remember it being pointed out to me as we pulled
into port there once. Are there others scattered around the globe?
Brent
Edinburgh and Greenwich in the UK, perhaps others as well.
http://www.deadlinenews.co.uk/2009/06/30/7110-1315/
An alternative for an inexpensive NTP server would be an older laptop. Until a
few years ago laptops had one native serial port, draw little power and
nowadays can be had for the asking (or very little money)
My favorite is the Dell D400. With at least 512M (768k or 1G recommended) of
RAM and
looks like NPR has a few
search Lightsquared on npr.org
I still like the FCC's bit on interference so far
Despite the test results released so far, the FCC insists the
interference questions are far from settled. Some of the tests to
date may have relied on different assumptions, metrics and
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Pete Lancashire
Sent: Tuesday, June 14, 2011 8:23 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Light squared on NPR
looks like NPR has a few
Hello again!
First I want to thank all respondents on the list for a number of advices
to my questions although it is not exactly 'time-nuts' stuff!
I have now decided to monitor eBay for commercial units for some days in
a hope to find a unit in an reasonable priceclass (and a seller willing
to
Perhaps. But FCC may also be saying, We're beginning to think it
*won't*work and need to cut ourselves some slack.
On Tue, Jun 14, 2011 at 9:31 AM, J. L. Trantham jlt...@att.net wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
On Tue, 14 Jun 2011 18:12:52 +0200
Per Molund pmol...@gmail.com wrote:
The reason for this is mostly based on the installation environment. I am
'piggy-backing' on an commerical site (ie. for free) and rack-space and
electricity are premium. I have also a need to have the installation look
I'm surprised there is not already some computer you could run NTP on.
As you've found out here NTP is a very light load even for a 0.4Ghz
486 class machine. There has to be a computer already in the rack
that can run NTP. What about your client machines? one or more of
them could connect to a
Pity... Hopefully no one was working on the dismantling when nature decided
to help.
Soon on eBay - Slightly used timeball - local pickup only...
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Dave Brown
Sent: Monday, June 13, 2011
Lets see feb to june. Time to restart this thread.
I found this a very interesting thread and finally ordered the transformers
from mini circuits. Needed some other parts and had enough of an order to
make sense.
I do plan to build the circuit and try some of the comments suggested to see
what
Almost lost...
OK. In the meantime I worked on a project where I needed a doubled
frequency of a signal with gaps. I made a synchronous oscillator locking
on the double frequency. Works great and is as simple as thing can go.
It works by injection locking. Such a circuits shows a PLL
Luciano followed this up off list and found that the suggested
improvements (and others) worked well.
The performance now closely mimics that of the simulations.
Final results:
Input range +6 to +13 dBm
Gain 0dB ± 1 dB on the input range.
Output harmonics and subharmonics -60 dBc
He intends to
Wow those are good results.
I have to say the thread was one that motivated me to buy parts and then to
do something.
If Luciano will be writing this up, I look forward to it. Always a good read
with excellent pictures.
I do not have a particular need just wanted to see what the suggestions
would
Pity... Hopefully no one was working on the dismantling when nature decided
to help.
Soon on eBay - Slightly used timeball - local pickup only...
You missed the: Some assembly required ;-P
Greetings,
Pieter.
___
time-nuts mailing list --
I do not think this is funy. Bert Kehren
In a message dated 6/14/2011 4:29:07 P.M. Eastern Daylight Time,
time-nuts-m...@tenpierick.com writes:
Pity... Hopefully no one was working on the dismantling when nature
decided
to help.
Soon on eBay - Slightly used timeball - local pickup
Hello,
I am in need of a very clean 24 Vdc power source, to replace some old
mercury cell batteries with. What would a good low noise, clean, power
supply be in your recommendations? I thought of using two 12 Vdc lead-acid
batteries in series, and making a charging circuit with regulators, but I
Some things are too serious not to laugh about.
Albert Schweitzer
On Tue, Jun 14, 2011 at 6:13 PM, ewkeh...@aol.com wrote:
I do not think this is funy. Bert Kehren
In a message dated 6/14/2011 4:29:07 P.M. Eastern Daylight Time,
time-nuts-m...@tenpierick.com writes:
Pity...
I was just looking at battery noise last week. I assume you need low
noise, not good regulation. If so then in practical terms, I think the
best thing you could do is get an 8 cell battery holder for AA cells
then connect a 220 uF capacitor across it.
This is pretty good. has test results for
On 06/13/2011 11:59 PM, David J Taylor wrote:
What OS have you been using? If it's windows, then blame the
windows usb serial driver. It's the biggest piece of sh*** i've
seen in a long time in the driver world. It is even able to
freeze the machine without blue screen. Reliably.
[]
Attila
Hi
Ni-cads are a pretty good bet.
Bob
On Jun 14, 2011, at 7:02 PM, Will Matney xfor...@citynet.net wrote:
Hello,
I am in need of a very clean 24 Vdc power source, to replace some old
mercury cell batteries with. What would a good low noise, clean, power
supply be in your
paul swed schrieb:
Other comment injection locking is always interesting to me because you can
inject at quite low frequencies. I would like to see some of the details
from Henry.
Here is a cut of a bigger circuit. Generates 10MHz from disturbed 10MHz
like a PSK transmitter. Or if you remove
Chirs,
No, actually, I need both. They used the mercury battery over its ability
to hold the voltage steady over its charged cycle, which was something they
did pretty well. It's a shame they've really not made anything to match
them yet, except I've heard of folks using Lithium in their place.
Bob,
I've thought about that, and also thought about the 24 volt battery packs
used in those Schwinn scooters the kids have. I can buy a 24 volt charger
cheap for those, but the batteries run about $60.00 each plus shipping, and
they are probably rated at around 4 amp hours, I think. It may be
Hi
Ni-cads are pretty low noise, reasonably stable, and close to the per cell
voltage of the mercury cells. The gotcha is the self discharge rate. If you
don't need a floating supply I suspect you can build up a good enough linear
regulator to get things working.
Bob
On Jun 14, 2011, at
Just a side note here should it ever come up, those usb serial converters don't
work in DOS. DOS doesn't support USB. You can kind of get them working in the
so-called DOS window of 32 bit windows, but many DOS apps won't work because
DOS allowed from direct control of the port and windows gets
Bob,
Yes, and especially after reading the article that Chris posted the link
to, I agree. Definately the lead-acid is out, after I saw the noise the
battery alone could generate. I always thought they were much cleaner than
that, and I wonder what type of havoc that could create on a GPS device
Hi Will,
You could consider building your own power supply system for the replacement of
the batteries. Use a separate power transformer which, I suspect, would be
small
as the current requirements would be low for driving a bridge circuit.
The main company to look toward for high quality, low
On 15 June 2011 10:13, ewkeh...@aol.com wrote:
I do not think this is funy. Bert Kehren
True, and I don't think it was funny for the guy who had a ball that day :)
Sorry, only kidding, just couldn't resist, I'm not aware of anyone being
injured in that building.
I do hope they had already
Bill,
I forgot to add, the Vishay bridge uses a Fluke 844 (OEM version of the
845AB) null-microvolt meter to read the bridge circuit. ESI did the same
thing, first using a HP 419, and then a Keithly 155 OEM meter assembly, for
their bridges.
The Fluke has its own supply from the line voltage.
Is the bridge excitation AC or DC. If it's AC, you may not even need
low-noise power supplies.
-John
==
Hi Will,
You could consider building your own power supply system for the
replacement of
the batteries. Use a separate power transformer which, I suspect, would
be small
Well thats sure simple. Uses the xor to create a short pulse to inject into
the oscillator.
Wouldn't the output be noisy?
Regards
On Tue, Jun 14, 2011 at 8:00 PM, ehydra ehy...@arcor.de wrote:
paul swed schrieb:
Other comment injection locking is always interesting to me because you
can
John,
No, it's DC. I'm trying to meet the original specs of the batteries in not
only voltage/current, but cleanliness of the current.
Now inside the Fluke 844, it has a chopper, and it uses an AC power supply
internally to feed its circuitry. The Vishays bridge uses the batteries
voltage, and
The reason I asked is that most microvolt bridges use choppers and have BP
filters at the chopper frequency, so noise is largely uncorrelated.
On the neon photochoppers, it has been discussed at length several times
on the HP-Agilent Yahyoo Group. A similar thing is used in the 410C. There
are
I forgot to add that noise on the bridge excitation should not matter much
when the bridge is at null, as the differential mode voltage is zero.
-John
===
John,
No, it's DC. I'm trying to meet the original specs of the batteries in not
only voltage/current, but cleanliness of
Though its a bit off topic
Ran into this chopper issue also on a HP410. I replaced the thing with a
modern chopper amp. I think an LTC. This was quite a few years ago (10 plus
easily) and it works very well. Still does actually. It did take a bit of
rework to get things back in balance correctly.
John,
I wondered about that, as using a LED is generally in conjunction with a
photo-transistor, and not a CDS cell. The reason I thought it might work is
that a company years back used them together to form a safety light
curtain.
The Fluke, and the HP, had a bad rep for those neon bulbs going
Hi Will,
I don't know. Check the HP Group archives. I only vaguely followed the
thread. I'm not so sure a phototransistor will work without circuit mods.
A photoFET might.
Best,
-John
===
John,
I wondered about that, as using a LED is generally in conjunction with a
Paul,
Remember the HP 412? It used incandescent bulbs, a spinning disc, and a
syncronous motor. I actually still use two of these, and the bulbs are the
only fault.
Best,
Will
*** REPLY SEPARATOR ***
On 6/14/2011 at 10:21 PM paul swed wrote:
Though its a bit off topic
Ran
Paul,
Remember the HP 412? It used incandescent bulbs, a spinning disc, and a
syncronous motor. I actually still use two of these, and the bulbs are the
only fault.
Getting back on topic, somewhat, has anyone ever checked the noise on the
rails feeding the OCXO's in this GPS equipment?
From: li...@lazygranch.com
Sent: Wednesday, June 15, 2011 1:25 AM
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] usb serial converter
Just a side note here should it ever come up, those usb serial
converters don't work in DOS. DOS doesn't
John,
I will check it out, and may do some experiments myself on these. Also, I
will take a look at the photo-FET's, as I had forgotten about those.
What has me wondering is how neon bulbs act in the circuit, their low
brightness, and their drop out times, as I think the on voltage is around
90
As for Internet, yes we do have an connection, but via GPRS so it is not any
good for ntp use. As for performance I am seeing 200-400 ms today with GPRS
which is not good enough for my application, I hope to get down into low or
sub ms range.
It would be an interesting experiment to see how
One of the annoying things is Dell provides a hardware serial port if you
buy a docking station, but no way to just get a serial port by itself using
the docking port. Well at least that I know of.
I have a Dell laptop (Latitude 430) that came with a MediaBase. It's another
layer that
Back in the day, we used something like that. Basically we were trying
to bit bang SMBus coms. But that only worked for win2k. Ultimately we
just put a uP on a demo board with a real serial port. You can only
kludge so much before you appear flaky to your customers.
On 6/14/2011 9:56 PM,
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