Hi everyone,
Not sure how many folks there are associated with the
"time-nuts" list but hi and hello from Melbourne Australia, I've just signed up
a couple of days ago and have already been seeing a degree of activityall
very good.
I don't know 'how qualified' I am to consi
corby d dawson wrote:
> Hi,
>
> I am playing with an Austron 1250B and I'd like to add a fine frequency
> adjust.
>
> The data sheet I have on the 1150 oscillator inside indicates that the
> EFC input is an option.
>
> Anyone have a schematic for the 1250B that shows how the 1150 is wired
> in.
>
>
As a microclimatologist I am very aware of the nocturnal inversions
that occur in the atmosphere.
From ground level to say 1000 feet the air cools at night forming a
dense layer. The dielectric
properties of this condition must create apparent thickness beneath
the satellites.
Whereas there
Well, I didn't start out to do a formal test of the survey repeatability. I
was actually testing my ThunderBolt control program. The survey command causes
lots of states in the unit to change and I was actually watching that. I did
write down the results that I got each time (I think I may
Hi Corby and Nigel. I think I have a data sheet for the 1150 oscillator
somewhere as well. I have an "orphan" 1MHz unit. The "a" definitely has the
EFC on the rear and I recollect seeing a spec for the swing per volt. I seen
to think it is quite fine and would be useful for GPS steering.
Alan G3NY
Hi Corby, my 1250a has an EFC connection on the rear panel (a bnc connector)
I have some circuitry but not sure at present what "suffix" letter it refers
to My 1250as have a 5MHz OCXO.
Alan G3NYK
- Original Message -
From: "corby d dawson" <[EMAIL PROTECTED]>
To:
Sent: Saturday, August 3
In a message dated 30/08/2008 22:53:17 GMT Daylight Time, [EMAIL PROTECTED]
writes:
I am playing with an Austron 1250B and I'd like to add a fine frequency
adjust.
The data sheet I have on the 1150 oscillator inside indicates that the
EFC input is an option.
Anyone have a schematic for t
> the FTS specs for their FTS1000A, FTS1200, FTS1002A and FTS1003A name
> short term stabilities for all four oscillators to be 1E-12 @ 1,10,100
> s. I have always believed that these specs are kind of "conservative"
> ones so that your FTS1200 #2 fits them VERY well while FTS1200 #1 barely
> meets
Hi,
I am playing with an Austron 1250B and I'd like to add a fine frequency
adjust.
The data sheet I have on the 1150 oscillator inside indicates that the
EFC input is an option.
Anyone have a schematic for the 1250B that shows how the 1150 is wired
in.
If no EFC on this unit I'll be getting r
Old oscillators can be a bit of a pain - as the years (or decades)
pass, aging and deterioration in various parts can have rather
undesirable effects on the performance. Even if it does not cause
actual failure, it can make them much less useful for precision
applications.
On Wed, 27 Aug 2008 14
> I set my location to the centroid of about a dozen surveys done over three
> days.
What was the standard deviation of the dozen surveys?
/tvb
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Besides the wonky geoid, ionospheric delays (which tend to be poorly modeled
and compensated for in single frequency receivers) tend to affect the altitude
reading the most.
You also need to set the cable delay time for best accuracy.
Also, for a cheap thrill, run the self survey several tim
On Sat, 2008-08-30 at 16:12 +0200, Arnold Tibus wrote:
> On Fri, 29 Aug 2008 22:21:43 -0400, Pieter Ibelings wrote:
>
> >Hi All,
>
> >I got a Trimble Thunderbold from Ebay and I am having trouble triggering the
> >HP 53131A. The 1PPS output shows a 10us pulse of 1 Volt into a high
> >impedanc
Arnold,
Thanks. I had a dirty BNC connector so I am now getting 5 volts and 10us
wide. I cannot get the counter to lock. There has to be a way of getting it
to work.
Regards,
Pieter
- Original Message -
From: "Arnold Tibus" <[EMAIL PROTECTED]>
To: "Discussion of precise time and freq
On Fri, 29 Aug 2008 22:21:43 -0400, Pieter Ibelings wrote:
>Hi All,
>I got a Trimble Thunderbold from Ebay and I am having trouble triggering the
>HP 53131A. The 1PPS output shows a 10us pulse of 1 Volt into a high
>impedance probe. This seems low to me. Should it be 5 volts? Maybe the
>outpu
Hi Dave,
On Sat, 2008-08-30 at 11:09 +0100, David Ackrill wrote:
> Michael Baker wrote:
>
> > However, after completing its self-survey it thinks
> > its elevation is 11.2 meters when the actual elevation
> > of its antenna (on my house roof) is 28.4 meters.
>
> I've not found any GPS receiver,
There's a discussion of the different height measurements and the errors
found when using 4 Garmin GPS receivers at
http://users.erols.com/dlwilson/gpsvert.htm
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Hello Mike and Group,
The altitude shown by Th is the WGS84 ellipsoidal altitude, so if you wish
to know your MSL, or ortometric altitude, it´s necessary to take into
account the undulation or difference between the geoid and the WGS84
ellipsoid for your location.
You can see a wordwide map
Michael Baker wrote:
> However, after completing its self-survey it thinks
> its elevation is 11.2 meters when the actual elevation
> of its antenna (on my house roof) is 28.4 meters.
I've not found any GPS receiver, available to the general pubic anyway,
that correctly reports its height above
Hello, All--
My Thunderbolt seems to be able to determine its
Lat and Lon location coordinates with reasonable accuracy.
However, after completing its self-survey it thinks
its elevation is 11.2 meters when the actual elevation
of its antenna (on my house roof) is 28.4 meters.
I arrived at this
The parts I have don't have date codes, but they must be circa 1990. Is there
any data out there regarding R&K devices? My library has nothing and the web
appears to be silent too.
-- Original message --
From: Jeffrey Pawlan <[EMAIL PROTECTED]>
> They were a co
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