In message 1409175707.2080.yahoomail...@web142706.mail.bf1.yahoo.com, Bob Ste
wart writes:
This looks like a step in the right direction.
The correct allan plot will have a clearly visible horizontal
segment somewhere in the 100-1 second range (depending on OCXO quality).
This is
I found also that I have a hardware problem. Bert posted recently that he
keeps his OCXOs out in the open with at least one inch of free space on all six
sides. My chassis badly ignores that, with the OCXO up against the edge of the
case. I noticed that the EFC changed and then a bit later
On Mon, 25 Aug 2014 10:48:51 -0400
Dan Kemppainen d...@irtelemetrics.com wrote:
Also, I have a low cost antenna coming. It's one of the Synergy systems
puck type amplified antennas. I remember some time back a bit of chatter
about improving GPS antennas for timing, by providing some sort of
The similar, and more serious issue is bird-poop.
The pointed cone shapes you see for commercial timing receiver
antennas are as much to keep birds from sitting on top of the antennas
as it is to get the snow off.
At least snow will eventually melt off.
--- Graham / KE9H
==
On Thu, Aug 28,
On Sat, 23 Aug 2014 16:38:42 -0700
Bob Stewart b...@evoria.net wrote:
Given that my antenna is just a puck at the peak of the attic (never got
around to adding the DIY choke-ring)
A choke ring will not help you much in the attic. You already have lots
of reflecting and refracting
The same shape that keeps bird off the antenna also keeps birds off.
It is worth getting the tall cone shape no matter where you live.
On Thu, Aug 28, 2014 at 6:04 AM, Attila Kinali att...@kinali.ch wrote:
On Mon, 25 Aug 2014 10:48:51 -0400
Dan Kemppainen d...@irtelemetrics.com wrote:
Also, I
Hi Attila,
Is wood, nails, and asphalt shingle really that big of a problem at these
frequencies? The antenna is within 2 ft of the highest point of the roof.
Bob
From: Attila Kinali att...@kinali.ch
To: Bob Stewart b...@evoria.net; Discussion of precise
Note that the high accurcy geodetic snow cones for chokering antenns have moved
towards thin spherical designs.
--
Björn
div Originalmeddelande /divdivFrån: Chris Albertson
albertson.ch...@gmail.com /divdivDatum:2014-08-28 15:17 (GMT+01:00)
/divdivTill: Discussion of
On Thu, 28 Aug 2014 06:30:14 -0700
Bob Stewart b...@evoria.net wrote:
Is wood, nails, and asphalt shingle really that big of a problem at these
frequencies? The antenna is within 2 ft of the highest point of the roof.
Consider this: A lot of people complain about the reflections caused
by
Attila Kinali wrote:
On Thu, 28 Aug 2014 06:30:14 -0700
Bob Stewart b...@evoria.net wrote:
Is wood, nails, and asphalt shingle really that big of a problem at
these frequencies? The antenna is within 2 ft of the highest point
of the roof.
Consider this: A lot of people complain about the
On Thu, 28 Aug 2014 09:21:51 -0500
Dave M dgmin...@mediacombb.net wrote:
How far above the metal roof should I mount the antenna so reflections will
be minimized, at least to the point of diminishing returns?
I've been told, that 2m is ok. Sorry, i don't have any hard numbers.
The antenna
On 08/28/14 05:03, Javier Herrero wrote:
Hello,
Here is the manual I've. I have also some other documentations, and some
Oscilloquartz software for the OSA-5585, but I don't know if they are
very useful.
Regards,
Javier
Hi Javier,
Thanks for that and for the other replies. The 3210 looks
Careful Chris, it sounds like you are developing the symptoms of the Vintage
strain of the time nuts infection. Next thing you know, you will be looking at
tall clocks.
Bob, who is debating the wisdom of non invasively synchronizing the family
heirloom tall clock to the new cesium clock...
I have the same disease. I have the clock, but the wife thinks that is
insane. I don't get her concern at all??? Especially when she says NO!.
Regards
Paul
WB8TSL
On Thu, Aug 28, 2014 at 10:39 AM, bownes bow...@gmail.com wrote:
Careful Chris, it sounds like you are developing the symptoms of
Chris,
Do you have a GPS clock?
First turn the operational mode setting from off to second step (ocxo +
ion pump) and let it stay there for a day or so.
Then, as the oven have stabilized, switch it over to third step, the
open loop mode, and tune the OCXO up against a GPS reference so that
On 08/28/14 14:39, bownes wrote:
Careful Chris, it sounds like you are developing the symptoms of the Vintage
strain of the time nuts infection. Next thing you know, you will be looking at
tall clocks.
Bob, who is debating the wisdom of non invasively synchronizing the family
heirloom tall
Is there a similar 'bring it back to life' procedure for the 5061A?
On Thu, Aug 28, 2014 at 12:32 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
Chris,
Do you have a GPS clock?
First turn the operational mode setting from off to second step (ocxo +
ion pump) and let it stay there
If you have tube-life and not other issues, it's about the same.
Also works for rubidiums, as the loop aspect here is essentially the same.
There can be *other* issues. For the 5060A for instance, you might need
to also adjust the crystal filter of the OCXO, as that too drifts out of
range, so
Björn,
Can you provide links to some examples? A picture or two would be great!
Attila,
Almost all the snow we get accumulates. However it does settle, even
then by mid February it's not unusual to see 4 or 5 feet on the ground...
However, that raises a good questions, in terms of cones and
On Thu, 28 Aug 2014 12:00:19 -0400
Dan Kemppainen d...@irtelemetrics.com wrote:
However, that raises a good questions, in terms of cones and shedding
snow. I wonder how a straight slender vertical pipe with capped end
would work. Say 6 feet long. Let the snow build on the top. You might
loose
On 8/28/2014 2:15 PM, Attila Kinali wrote:
On Thu, 28 Aug 2014 12:00:19 -0400
Dan Kemppainen d...@irtelemetrics.com wrote:
However, that raises a good questions, in terms of cones and shedding
snow. I wonder how a straight slender vertical pipe with capped end
...
But the pipe is not such a
Attila,
On 08/28/2014 08:15 PM, Attila Kinali wrote:
On Thu, 28 Aug 2014 12:00:19 -0400
Dan Kemppainen d...@irtelemetrics.com wrote:
However, that raises a good questions, in terms of cones and shedding
snow. I wonder how a straight slender vertical pipe with capped end
would work. Say 6 feet
Hello,
Then it is a quite different beast to the EUDICS 3120, that they also
call OSA-3120... I note now that yours is a 3210, not 3120 :)
Regards,
Javier
P.S. no, there is no known cure to the time nuts things interest. It
becomes chronic, and only gets worse ;)
On 28/08/2014 16:33,
On Thu, 28 Aug 2014 20:59:28 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
But the pipe is not such a good idea. All signals from high elevation
angle will have a long path trough the pipe, changing their phase
ever so slightly. How much, depends on the pipe, it's thiknes and
On 08/28/14 19:53, Javier Herrero wrote:
Hello,
Then it is a quite different beast to the EUDICS 3120, that they also
call OSA-3120... I note now that yours is a 3210, not 3120 :)
Regards,
Javier
The 3210 looks like a much earlier design, prior to the inclusion of
microprocessor control.
Hi
Simple answer - yes.
My observation over the years is that your typical roof absorbs quite a bit of
RF starting way below GPS frequencies. My *guess* is that shingles are a bit
lossy. Shingles + moisture more so. Shingles + dirt + moisture even worse. I
also believe that plywood suffers
FTS had a patent on microcontroller steered cesium, which could
naturally have limited the spreading time of that technology.
Oscilloquartz at the time where more focused on the telecommunication
market and meeting the ITU-T G.811 PRC quality requirement, keeping
within +/. 1E-11 in
On Thu, Aug 28, 2014 at 6:30 AM, Bob Stewart b...@evoria.net wrote:
Hi Attila,
Is wood, nails, and asphalt shingle really that big of a problem at these
frequencies? The antenna is within 2 ft of the highest point of the roof.
Depends on what you call a problem. If you are getting a
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