- Original Message -
From: "Peter Putnam"
To: "Time Nuts"
Sent: Friday, September 04, 2009 1:30 AM
Subject: [time-nuts] OCXO sensitive to gravitational effects
You have all been a bit stingy with your gravitational inputs on the hp
18011 oscillator... one G this way... two Gs t
You have all been a bit stingy with your gravitational inputs on the hp
18011 oscillator... one G this way... two Gs the other way...
Here you can see the result of some serious Gs, all applied at the same
time...
e*.* auction item:160360186935
Add only $56.55 to your bid to s
Hi,
the model of bias tee referenced below works well, with very low insertion
loss, down towards 1GHz, despite the manufacturer's specifications:
http://www.ohiomicrowave.com/things/hwe32biasteetranscept1000204C.pdf
Item #270287524274 on a well known Internet auction site, lists the
"Buy-It-Now"
In a message dated 03/09/2009 02:05:20 GMT Daylight Time,
brucekar...@aol.com writes:
I bought a 3.6-V Trimble Bullet GPS antenna on ePay and wish to use it
with
my T-bolt. Rather than try to internally modify the T-bolt to provide a
3.6-V antenna feed, I decided to try to build an in-line dr
The more I kept looking at the data I was getting with regard to comparing
the Z3801 to the Tbolt, the less sense it made. Finally, I concluded that I
made some kind of fundamental error either in how I was measuring or there
was a problem with what I was measuring with. The only thing I am sure of
b...@lysator.liu.se wrote:
Look out for "GPS Source" and "GPS Networking" splitters they are purpose
built for GPS use, and are not limited to L1, like the
Symmetricom/Agilent/HP family of splitters. btw 58535A is the HP 2 port
splitter.
A benefit of the HP/Agilent/Symmetricom splitters (and so
The standard self-surveys in these units leaves MUCH to be desired. You need
to do surveys for 24 hours to help mitigate satellite constellation and
atmospheric effects. Note that due to periods of poor satellite geometry, you
can't just survey for 24*60*60 fixes. You need the survey to be
Go buy an antenna splitter. That might even be cheaper than a bias-T. Its
also a good excuse to get more GPS receivers.
--
Björn
>
> In a message dated 03/09/2009 18:46:34 GMT Daylight Time,
> warrensjmail-...@yahoo.com writes:
>
> Um is right,
> One of us is missing something, I wonder
Hi John,
With regard to the altitude, what I have found is that it is never close ! I
have seen variations all over the scale. What I did here is determine, to the
best of my ability, from TOPO maps what my altitude is and measure the height of
the antenna off of the ground where it is mounted a
Yesterday, I thought the Tbolt was wandering around too much. So, I did a
factory reset and started a new 5K
fix self survey. At about the same time, I started a new self survey on the
Z3801 thinking that if they were
both looking at the same satellites with the same antenna at the same time,
they
In a message dated 03/09/2009 18:46:34 GMT Daylight Time,
warrensjmail-...@yahoo.com writes:
Um is right,
One of us is missing something, I wonder which one, I think I know.
He has a good bypass cap across all that, The RF is not going to see the
diodes.
ws
---
Ye Gods,
Nigel
Um is right,
One of us is missing something, I wonder which one, I think I know.
He has a good bypass cap across all that, The RF is not going to see the diodes.
ws
---
Um
Not really a very good idea, we're talking about two silicon diodes in
series with each
It is with much sadness that I report the passing of Den Connors, KD2S
at 2AM this morning. Den passed on after a year+ fight to conquer
lymphoma. This morning, Ralph (KD1SM) reported
"Den checked-in to our weekly Club information net on 70cm
Monday evening. As usual, he sounded pretty ch
In a message dated 03/09/2009 17:04:50 GMT Daylight Time,
warrensjmail-...@yahoo.com writes:
Seems like a good idea, a lot simpler and cleaner than the other
suggestions.
Sounds like a data problem, I'd suspect your VSWR meter or cabling first.
Maybe your VSWR meter does not like diodes e
Bruce
Seems like a good idea, a lot simpler and cleaner than the other suggestions.
Sounds like a data problem, I'd suspect your VSWR meter or cabling first.
Maybe your VSWR meter does not like diodes especially if it is not running
current thru them.
And if you are running current thru them to
Maybe! But for the sake of clarity: I have been asking how HP/Symmetricom
manage to handle the regulation loop appearantly WITHOUT time constant
adaption/switching and with a fixed time constant that seems to be much too
high to start with for a cold OCXO.
Best regards
Ulrich Bangert
One
Poul,
> This argument is utttrly bogus: adaptive time-constant PLL's
> are at least 30 years old, and rather trivial to implement...
it is a complete mystery to me how you manage to critisize ME for something
that TRIMBLE has not implemented!? And exactly because they did not
implement it my arg
I don't know the particular antenna so I'm going by experience in
similar situations in offering this this thought: It seems to me
that you should be able to put the diodes between the antenna's
internal equivalent to a bias-T and and the D.C. supply line to the
pre-amp, out of the RF path.
In message , "Ulrich Bangert" writes:
>The true thrill is however one step more subtle: It first considers the
>question WHY trimble choose 100 s as the default loop time constant. Well,
>this one is easy to answer: Just set the time constant of a "cold" TBOLT to
>1000 and watch the TIC value flyi
John,
> ...I was amazed to find that the difference between the
> two is actually very easy to see. A 50 nsec. drift over 30
> minutes. Funny thing is it slowly swings back and forth. I
> suppose it is due to the different disciplining algorithms of
> the two units.
I find observations like
In a message dated 03/09/2009 02:05:20 GMT Daylight Time,
brucekar...@aol.com writes:
I bought a 3.6-V Trimble Bullet GPS antenna on ePay and wish to use it
with
my T-bolt. Rather than try to internally modify the T-bolt to provide a
3.6-V antenna feed, I decided to try to build an in-
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