Every GPSDO has only one 10MHz signal: the one coming from the OCXO. If
there are many outputs they must always be the same. When the GPS has the
3D fix (or the position hold) and the algorithm has synchronized the OCXO,
the 10MHz can be said "locked" but, when speaking about GPSDO, the correct
wor
Not "every" GPSDO has a 10MHz OCXO.
5MHz is, or was, quite common, and I've come across at least one GPSDO
with a 10MHz output that I assumed would use a 10MHz OCXO but that also turned
out to be based on a 5MHz unit.
Then there's the variant of the Trak Microwave 8821B, as just one exampl
21/08/2012 11:40
Can anyone please link specifically to a suitable distribution amp for
my TB please, either here if it's allowed, or by e-mail to me at
ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay
purchase would be painless. I feel it would be really easy for someone
a
>
>Not "every" GPSDO has a 10MHz OCXO.
>
That is certainly true although from a time-nuts point of view, 10Mhz is
certainly
a very nice number. I have linked to a photo of both sides of a Trimble 1.5"x5"
GPSDO built about 2008 that has a 1" square Trimble branded OXCO that has
a 76.80Mhz a
10MHz would have certainly been more useful to me as a reference source
for test gear, my original intention, than the 2.048MHz I ended up with.
Nice easy divide down to 1or 2 KHz though, if only I could find a use for
that:-)
Those photos are of a Trimble Mini-T, I didn't realise they did t
Nigel,
you can easily divide the 16.384MHz by 16.384 (2^14) to get 1 kHz for
phase locking a 10 MHz oscillator with your GPS box.
Adrian
gandal...@aol.com schrieb:
Not "every" GPSDO has a 10MHz OCXO.
5MHz is, or was, quite common, and I've come across at least one GPSDO
with a 10MHz out
From: Chris Wilson
21/08/2012 11:40
Can anyone please link specifically to a suitable distribution amp for
my TB please, either here if it's allowed, or by e-mail to me at
ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay
purchase would be painless. I feel it would be really
Use an analog video distribution amplifier (Grass Valley Group, Leitch, Ross
Video etc). These have between 6 to 8 outputs and will provide a reference to
various test equipment.
From: "time-nuts-requ...@febo.com"
To: time-nuts@febo.com
Sent: Tuesday, August 21, 2012 6:00 AM
Subject: time-nu
Not necessary in the Z3815A: it has already a 10MHz output. There are 3 SMB
connectors near the rear connector, they are labelled so it should be easy
for you to locate the 10MHz and the PPS output. Now I can't open my Z3815A
to help, it is in use but from the picture found in Internet I see that t
Hi Adrian
Yes, I decided that too and may well try it sometime, although it's quite
well down the "to do" pile right now, and it's even made slightly easier as
it's already divided down internally to 2.048MHz:-)
Ironically, when I bought the Trak unit I already had a 2.048MHz master
osci
Thanks Chris.
I always appreciate clear explanations. I'm assuming that the "fixed
location" requirement is important to note for purposes of compensating
for any dopler shift, as well as the distance the signal must first
travel before being decoded.
... I would presume that the fixed location u
On 08/21/2012 12:35 PM, Sarah White wrote:
Thanks Chris.
I always appreciate clear explanations. I'm assuming that the "fixed
location" requirement is important to note for purposes of compensating
for any dopler shift, as well as the distance the signal must first
travel before being decoded.
I like to think of it this way:
If you are talking instantaneous measurements, then watts is indeed always
volts * amps. With a resistive load, the signs of volts and amps are
always the same, and the product of the two is always non-negative. If you
calculate the average of instantaneous watts o
On Tue, Aug 21, 2012 at 9:35 AM, Sarah White wrote:
> Thanks Chris.
>
> I always appreciate clear explanations. I'm assuming that the "fixed
> location" requirement is important to note for purposes of compensating
> for any dopler shift, as well as the distance the signal must first
> travel bef
Hello everyone,
I am new to this forum.
It looks like a lively discussion on various topics.
A colleague of mine here at Agilent pointed me to this paper entitled "The
Design of Low Jitter Hard Limiters" by Oliver Collins. In Bruce Griffiths'
precision time in frequency webpage, this paper
Chris,
I was able to mount my David Partridge divider board inside an Extron ADA 6
300MX television distribution amplifier along with a 1 MHz sine wave
filter and a 10 MHz to 100 MHz multiplier.
On the front panel is a selector switch for selecting the division ratio,
BNC jacks for this a
Wow. Okay. The user manual actual considers this cable delay to be worth
mention?
I can see why the trimble thunderbolt is a favorite among time nuts <3
I'm sold.
On 8/21/2012 12:48 PM, Chris Albertson wrote:
> On Tue, Aug 21, 2012 at 9:35 AM, Sarah White wrote:
>
>> Thanks Chris.
>>
>> I alwa
I bought a eBay video distribution amp. The bandwidth was not as good as
I liked but for some reason the opamps were run off +/- 12 volts. Raising
the power to +/- 18V greatly improved the performance of the amp. Many
video amp assume the signal to 6MHz bandwidth might not be ideal. But on
t
It all depends on the brand and if 'commercial' or not. A Grass Valley
(dont remember the model)
tested is 3db down starting around 25 MHz. I have also seen others
that have a LP filter option
installed on the input module.
-pete
On Tue, Aug 21, 2012 at 9:54 AM, Chris Albertson
wrote:
> I bou
Exactly right on many of the accounts. The oldest DAs may be 6 Mhz but I am
not sure you will even find them any longer. The more modern preHDTVs were
all easily in the 10-30 Mhz region. Most have eq adjustments so that you
could peak for the higher frequency like 10 Mhz.
Boy the amps and chassis a
The importance of cable delay depends on what you are doing with the time.
If you are taking data in remote locations with different GPS receivers,
then cable delay is necessary to correlate the results in time. See the
recent mail on FTL neutrinos.
If you are being NTP Stratum 0 to one network (p
I'm working on a "Time-Nuts" based exhibit at the 2012 MakerFaire in NYC
(http://makerfaire.com/newyork/2012/). The idea is the history of time
distribution with a focus on modern timekeeping (1900 to the present). It is a
non-commercial booth, focused on education, and demonstrating micro-proce
kuze...@gmail.com said:
> ... I would presume that the fixed location used for above calculations
> would be relative to the position of the antenna?
A side effect of figuring out where you are is figuring out when you are
there.
There are 4 unknowns: X, Y, Z, T, so you need 4 equations. You g
On Tue, 21 Aug 2012 11:44:17 +0100, Chris Wilson wrote:
> Can anyone please link specifically to a suitable distribution amp for
> my TB please, Cost is a factor, and I
> am in the UK. An Ebay purchase would be painless. I feel it would be
> really easy for someone as daft as me to buy something t
Hi Nigel,
> Then there's the variant of the Trak Microwave 8821B, as just one
> example,
> that uses a 16.384MHz OCXO from which they derive a 2.048MHz output
> without 10MHz anywhere in sight.
> When I bought one of those a few years ago I assumed that all 8821Bs
> would
> be 10MHz GPSDOs, or s
On Tue, 21 Aug 2012 10:50:43 -0600, wrote:
>Hello everyone,
>
>I am new to this forum.
>It looks like a lively discussion on various topics.
>
>A colleague of mine here at Agilent pointed me to this paper entitled "The
>Design of Low Jitter Hard Limiters" by Oliver Collins. In Bruce Griffith
On 8/21/2012 1:22 PM, David wrote:
On Tue, 21 Aug 2012 10:50:43 -0600, wrote:
Hello everyone,
I am new to this forum.
It looks like a lively discussion on various topics.
A colleague of mine here at Agilent pointed me to this paper entitled "The Design of Low
Jitter Hard Limiters" by Oliver
Hi Everyone,
I uploaded the paper to my music website.
http://www.rajsodhi.com/images/The%20Design%20of%20Low%20Jitter%20Hard%20Limiters,%20Oliver%20Collins%20May%201996.pdf
Yours,
Raj
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Hi Raj,
On 08/21/2012 06:50 PM, raj_so...@agilent.com wrote:
Hello everyone,
I am new to this forum.
It looks like a lively discussion on various topics.
A colleague of mine here at Agilent pointed me to this paper entitled "The Design of Low
Jitter Hard Limiters" by Oliver Collins. In Bruce
Hi Raj,
welcome. Thank you for joining the group and thanks to Magnus for his
comment about the Collins' paper.
On Tue, Aug 21, 2012 at 11:51 PM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
> Hi Raj,
>
>
> On 08/21/2012 06:50 PM, raj_so...@agilent.com wrote:
>
>> Hello everyone,
>>
>> I
Hi
Since the Collins approach "tunes" the system for a single frequency input
(more or less), the approach is probably not the best for a "many decades" sort
of frequency range. There are a number of things that he alludes to in the
paper, but does not directly address. The most obvious is the
Does any one know about a gray cased Thunderbolt? This unit is
backwards from the gold box T-Bolt. The circuit card is mounted on the
non-flanged case half (that has the connector cutouts). There is no
serial number sticker, but does have the power supply sticker next to
the connector. And
I currently use a Grass Valley Group 8802 video distribution amp (DA). Yes
they start to roll-off the frequency at 6 MHz but the roll-off is gradual and
it will certianly pass 10 MHz with no problem. Remember you are not passing
multple frequencies or multi-burst, just 10 MHz. Also, these DAs
Dear Group,
I wish you well.
Do you recall a message and thread about a month ago with my concerns about
buying a used / unknown condition HP-5065a rubidium frequency standard? I bit
the bullet and bought it. Almost mint condition (cosmetically speaking) and
with several operational issues.
Remember * * * these DAs are designed be unity gain and to
handle approximately 1 volt p-p so be carefull of clipping if you
drive much more than that level or alternatively, pad down the input
to a 1 volt level.
Also, video DAs are designed to drive 75 ohms (the video world's
standard
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