jimlux wrote:
On 3/15/11 9:36 PM, Hal Murray wrote:
If I were doing this in my backyard on a budget I'd mount a small
telescope nearly straight up so that a bright star would pass through
the field on several nights. I'd measure the light of the star
through a slit and time the peak of the
Couldn't you rig up a MLBI (medium, not very) setup between you and someone
else in your area..
Could one detect pulses (or a signal) from some quasar (or infinite
distance stellar source) with a reasonable small antenna.
Suppose you have two antennas X seconds (at speed-of-light) apart
I thought for timing a view of the horizon was bad.
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Knowing the audience here, I'm half expecting that some of you who purchased my
divider boards will have done some measurements on my board ...
If you have some results to share, I and others would be interested to know.
Many thanks,
David Partridge
When the clock stops in your hallway, it's a nuisance, but not a big deal.
You get some new batteries, or you wind it up again, and you carry on with
your life.
But when the Olympic Clock stops – the clock that counts down the days,
hours, minutes and seconds to the next Olympic Games
Hi
If you only have one sat to look at, horizon view is worse than overhead. With
multiple sats you want them spaced out over the sky to get a benefit from
triangulation.
More TBolt opinions (there are lots of us and we all have them ...)
The wonderful thing about a TBolt is that it can use
k6...@comcast.net wrote:
...
You want to pick up a copy of Lady Heather from John's website, here:
http://www.ke5fx.com/heather/beta.exe You can do this well in advance of
actually
having your own Thunderbolt, antenna, and all the fixins'...
Assuming you have a windows box to run it on, one of
On 3/15/11 11:08 PM, Bruce Griffiths wrote:
jimlux wrote:
On 3/15/11 9:36 PM, Hal Murray wrote:
If I were doing this in my backyard on a budget I'd mount a small
telescope nearly straight up so that a bright star would pass through
the field on several nights. I'd measure the light of the
Hello Richard,
customer support is very dear to us, and we hope to be doing a better job
than some of the other companies out there.. We will do our best to support
our products long into the future.
Unfortunately with the CSAC being a brand new bleeding-edge technology it
may take some
Maybe there are a few of those countdown to Y2K clocks laying around that
could be recycled?
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: gandal...@aol.com
Sender: time-nuts-boun...@febo.com
Date: Wed, 16 Mar 2011 06:36:12
I'll vouch for the Thunderbolt Standard Easy Kit from Fluke.L (Bob Mokia) on
ebay. The one I bought a month ago contained a new-in-a-box Tbolt (manufactured
in 2004, with the Trimble OXCO and the higher resolution DS1620 thermometer
(read the Time Nuts archives about the Tbolt variants);
Hi
The kits are a good idea if you are starting completely from scratch. You
would not be able to round up (and ship from China) all that stuff for less
than the price of the kit.
If you already have coax and a power supply, it's certainly easier to get
the kit, but there's no real cost
My point is the Tbolt software is set up to ignore birds on the horizon. It is
a parameter you can set. So I don't follow how seeing the horizon is very
important.
--Original Message--
From: Bob Camp
To: li...@lazygranch.com
To: Discussion of precise time and frequency measurement
Hi
If you can see to the horizon, you can likely get reasonable timing off of
sats to 10 to 20 degrees off the horizon. If you can only see to 45 degrees
above the horizon, then you can likely get good timing off sats that are 55
to 65 degrees or higher. In both cases you can track further, the
On Wed, Mar 16, 2011 at 4:51 AM, Bob Camp li...@rtty.us wrote:
The wonderful thing about a TBolt is that it can use foam core TV satellite
coax. Since 75 ohms is lower loss than 50 ohm (all else being constant) you
can get away with quite a bit of the stuff. F connectors are easy to do
Chris Albertson wrote:
I think the best setup is to put a 1 iron pipe on the roof that is
taller then any other vents or pipes up there but not so tall you
can't reach and work on the top. Mount the antenna on that pipe and
run the cable trough the pipe, through the roof and then straight
Well other than moving to Kansas, I doubt I will ever see the horizon.
The official timing antennas are designed not to see well at the horizon. I
use a marine GPS which does see the horizon, but filter those birds out.
-Original Message-
From: Bob Camp li...@rtty.us
Date: Wed, 16 Mar
On Wed, Mar 16, 2011 at 10:07 AM, Heinzmann, Stefan (ALC NetworX
GmbH) stefan.heinzm...@alcnetworx.de wrote:
Isn't that an invitation for disaster in a thunderstorm? I'm sure the US has
some definite rules on how such things need to be set up and grounded.
Sorry I was thinking only about
On Wed, Mar 16, 2011 at 6:34 AM, saidj...@aol.com wrote:
Hello Richard,
customer support is very dear to us, and we hope to be doing a better job
than some of the other companies out there.. We will do our best to support
our products long into the future.
What is the current street price
On 03/16/2011 02:25 PM, jimlux wrote:
Or, you can send a signal between the two stations by an RF link. If I
recall correctly, you'd need to compensate for propagation variations,
but, a two way scheme might work for that. I think I have a paper
somewhere that talks about how they did that for
Hi Chris,
as this is a brand new product, pricing depends on quantity and ordering
options.
Please contact Giovanni at _giovanni@jackson-labs.com_
(mailto:giova...@jackson-labs.com) to discuss details if you like.
I can say however that it's about half the price of a typical 19 inch
On Wed, Mar 16, 2011 at 1:14 AM, Hal Murray hmur...@megapathdsl.net wrote:
Your pointing accuracy is Y/X, or something close to that.
That describes perfectly when radio can beat optics. The angular
resolution of the system is the aperture size over the wavelength.
So you can see that a radio
[snip] but technology exists to build a radio
antenna array that is one Earth diameter wide. So radio wins if you
have a government or university sized budget [snip]
Yes. Been done. It's called VLBI.
-John
=
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Hi
Since you are going for time transfer, ping pong on a single channel should do
pretty well. With some clever design you could locally receive your transmitted
packet. You would drop out a lot of local detuned coil issues that way. A
lot would depend on just how far you needed to stretch
Hi
Every place I have lived here in the US wants you to put a simple ground block
on the antenna lead. It's not much of an arrestor compared to the real thing.
Since the auction sites will sell you the right part for less than $20 (at
least they used to) there's not much reason to do it wrong.
Which is the preferred unit for implementing a GPS disciplined standard,
pricing aside?
Tnx
wayne
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On Wed, Mar 16, 2011 at 8:00 PM, Wayne Splawn wa...@att.net wrote:
Which is the preferred unit for implementing a GPS disciplined standard,
pricing aside?
The t-bolt is a GPS disciplined oscillator. the M12 is only a GPS and
you'd need to add the oscillator and the means to discipline it.
--
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