Hi Burt
My printed manual for the 3336x has the Rev E power supply schematic and
parts layout, if nobody has it already scanned I can scan it for you later
today.
Just the PSU that is, scanning the whole thing would be a mammoth task:-)
Regards
Nigel
GM8PZR
In a message dated
Hi Burt
I've been taking a further look at this and the 268 page 3336 service
manual that's available online seems to have been updated in some areas but not
in others.
The replaceable parts list, for example, reflects the changed component
values and extra components as fitted to the
Use the 74ABT2244: integrated resitors at the outputs.
On Fri, May 18, 2012 at 4:50 AM, Rex r...@sonic.net wrote:
In line with what Bob suggests, here is one of the square wave outputs of
an HP Z3816A...
Hi
For a 50 ohm buffer, you probably want something like 200 ohms in series
with each output (4 buffers) or 400 ohms (8 buffers).
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Azelio Boriani
Sent: Friday, May 18, 2012 7:55 AM
On 05/18/2012 08:24 AM, Bob Camp wrote:
Hi
For a 50 ohm buffer, you probably want something like 200 ohms in series
with each output (4 buffers) or 400 ohms (8 buffers).
Yep, I ended up choosing a quad buffer with 180 ohms on each pin which
should yield 45 ohm source impedance and 27mA
As a driver, you can look at the RS-485 drivers. Some have very temperature
stable and well controlled delays in the 10nS range, and they can drive
relatively low impedances. I do not have the P/N on hand, but if you can't find
one, let me know and I'll send you the P/N from home.
Didier
Hi
The next layer to this is stuff like over-voltage and short circuit
protection. I'd at least rate the parts so they can handle an indefinite
duration short on the output. If you have 5V and a 50 ohm source, that's
going to be about 1/2 watt going *somewhere*.
Bob
-Original Message-
While you're at it, add an ATMEGA328 processor and a 250 ps res/256 step delay
line. The processor reads the timing message, picks off the sawtooth
correction factor, converts it to an 8-bit value that it output on a port to
the delay line. The 1PPS signal clocks the port into the delay
On 05/18/2012 01:33 PM, Mark Sims wrote:
While you're at it, add an ATMEGA328 processor and a 250 ps res/256 step delay
line. The processor reads the timing message, picks off the sawtooth
correction factor, converts it to an 8-bit value that it output on a port to
the delay line. The
Hi, Time-Nuts guys anyone know where I can get software for a Navman jupiter T
Tu60 GPS Kit 1pps 10khz GPS Module.
Thankyou
Ken Kubick
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On 05/18/2012 07:24 AM, Bob Camp wrote:
Hi
For a 50 ohm buffer, you probably want something like 200 ohms in series
with each output (4 buffers) or 400 ohms (8 buffers).
It may be worthwhile considering the gate output impedance as well. For
example, for 5V AC logic driving a 50 ohm line
Be careful that you use the proper logic device for the GPS 1PPS output.
An 74AC device has a minimum HIGH input logic level of 2.1 volts when running
with
a 3.0 volt VCC, and 3.65 when running at 5 volt VCC. A GPS receiver running at
3.3
volts may be on the edge. Consider using a 74F part
Hi
If that's a concern, use a 74ACT part
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jerry Mulchin
Sent: Friday, May 18, 2012 3:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Buffering
If this is for a computer and NTP then you may ignore the sawtooth.
GPS receiver sawtooth corrections are for people working at the
nanosecond level; important when you're working with disciplining
quartz or rubidium oscillators with stability at the 1e-12 level.
Computer timekeeping and NTP is
Le 18/05/2012 20:14, Ken Kubick a écrit :
Hi, Time-Nuts guys anyone know where I can get software for a Navman jupiter T
Tu60 GPS Kit 1pps 10khz GPS Module.
What you need depends on the protocol it powers up in.
If it is Motorola, you can talk to it with TAC32
If in Zodiac binary, then
Ken,
Are you wanting something to monitor the receiver data? It is the same as
the Motorola UT+. Rick Hanby (CNS Systems and a fellow timenut) sells a
program called TAC32 Plus which will do the job.
Regards,
Doug
Connected by DROID on Verizon Wireless
-Original message-
From:
There is another older free program that I got from the Motorola web site.
That if all you want to do is verify that it works NTP can do that.
Usethe GPS as an NTP clock source.
On Fri, May 18, 2012 at 4:38 PM, k4...@aol.com k4...@aol.com wrote:
Ken,
Are you wanting something to monitor the
Mike,
The standard Jupiter-T should never power up in Rockwell binary. You have to
command it to go to binary with a special Motorola format message.
Regards,
Doug
Connected by DROID on Verizon Wireless
-Original message-
From: mike cook michael.c...@sfr.fr
To: time-nuts@febo.com
t...@leapsecond.com said:
If this is for a computer and NTP then you may ignore the sawtooth.
GPS receiver sawtooth corrections are for people working at the nanosecond
level; important when you're working with disciplining quartz or rubidium
oscillators with stability at the 1e-12 level.
No, actually it is for my alarm clock. Ignore the sawtooth? Poppycock!
What self-respecting time nut could possibly tolerate being woken up with a +/-
15 ns uncertainty...
---
If this is for a computer and NTP then you may ignore the sawtooth.
GPS receiver sawtooth
Agreed. I made the distinction as someone in a previous thread was
indicating that they got a rockwell binary response on power on.
Le 19/05/2012 01:42, k4...@aol.com a écrit :
Mike,
The standard Jupiter-T should never power up in Rockwell binary. You have to
command it to go to binary with
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