In message [EMAIL PROTECTED], Chri
s Kuethe writes:
You mean like this card?
http://www.maxipub.com/electro/photos/dv488.jpg
it could be a Metrabyte DV-488 ... or maybe an MBC-488
Most of these cards are 100% compatible with the original IBM GPIB
ISA card, except possibly for the order of the
Don,
Try Googling around to see if you can find the spec for the downconverter.
We recently managed to get an old Odetics 325 working with a Meinberg
antenna/converter unit. Have emailed you the Meinberg manual off list.
Rob Kimberley
-Original Message-
From: [EMAIL PROTECTED]
Hi,
I believe you're talking about the ISA PCIIA GPIB cards, yes they where
(still are I guess? ) supported under Linux under the Linux GPIB project.
I was using few of these in the past.
Windows ( at least 98 XP) doesn't recognise properly these PCIIA cards.
73's
pf, F5BQP
- Original
Hi,
I have been having fun with my TBolt, and I am organising a power
supply to run it off
a 12 volt battery backed up power supply.
I am making my own low headroom regulators, I assume it will perform
better with precisely
controlled supply voltages.
What I need next is a monitor to show the
I've spent a good deal of time this weekend working with the 5061B I recently
acquired.
The unit appears to be making stable 10 MHz. I've compared it the the Rubidium
source I have and the two compare as expected.
There are two problems:
1) Beam current is low - even after going carefully
It looks like the feature set varies significantly with the router
model, and by IOS feature set. The router I have here is an eBay
special, an old 2514. It's probably 10 years old, though I think
Cisco continued to make them until about 2003. It's only configured
with 8mb flash, so
Tell me what kind of signal you need to drive your clock, and I may be able
to get what you need from the processor.
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Neville Michie
Sent: Sunday, October 05, 2008 6:34 AM
To: Discussion
The NEC 7210 was the industry standard GPIB chip for over 20 years, I still
have a few here. If you want the spec and can't find it, I probably have it
here somewhere.
Didier
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Brian Kirby
Sent:
Hi,
If it looks like this one:
http://www.measurementcomputing.com/pdfs/isa-gpib-pc2a.pdf
then it could be a legacy ISA PC2IIA from NI or a compatible one.
pf
- Original Message -
From: Didier Juges [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement'
Did you try the LF injection test?
On Sun, Oct 5, 2008 at 8:48 AM, Jeffrey Okamitsu [EMAIL PROTECTED] wrote:
I've spent a good deal of time this weekend working with the 5061B I recently
acquired.
The unit appears to be making stable 10 MHz. I've compared it the the
Rubidium source I
Jeff,
What is the 2nd harmonic meter reading?
If it is too low you will not be able to get the operate light on.
While watching the 2nd harmonic reading adjust the front panel beam I pot
for a reading of 35 to 45.
If pot is at max adjust the loop gain thru the front panel hole for the
35-45
Second on the - be careful on what you buy
BUT Symmetricom does sell the 'downconverter' for long cable runs -
It's also cheap (relatively) as I recall on the order of $200-300 as
we needed one for one of our installations which is machine room in
basement antenna at top of 15 story building.
This runs on the aux port, and the sup720 doesn't have an aux port...
There are always obscure features that slip into the production releases
that aren't tested and they just forget to exclude them during builds.
TAC will probably have no clue about this...
You could try the cisco-nsp mailling
Steve,
The suggestion of using the mains frequency as a reference is not
practical. There will be no certainty, even after counting for a week
that the mains frequency will give you a reliable reference. You said it
yourself - the instantaneous frequency of the mains is not always spot
on.
The
Ed
Per your message : That would be the 'byte stuffing' inherent in TSIP packet
structure.
Packet 0X8F-AB is specified as being 17 bytes including the subcode ( 8F)
Do you mean that you cant depend on that packet always being 17 bytes ?
I'm getting 18 bytes only when the time has 16 seconds in
Ed,
Got itFound the spec ! Thanks for the hint !
Hank
The bytes in the data string can have any value. To prevent confusion with the
frame
sequences DLE ID and DLE ETX, every DLE byte in the data string is
preceded by an extra DLE byte ('stuffing'). These extra DLE bytes must be
If you cant depend on having a constant number of bytes ( as defined
in the spec ) , how do you then decode it ?
You have to do the de-stuffing before you check the length and decode the
packet.
It will be obvious after you see it. If the Trimble manual isn't good
enough, google for
(I forgot what the subject of this thread was, but it's not time-nuts Digest)
The suggestion of using the mains frequency as a reference is not
practical. There will be no certainty, even after counting for a week
that the mains frequency will give you a reliable reference. You said
it
The clock displays are of two types. The analogue dials use alternate
negative and positive pulses
and are easily generated with a 0.5 Hz square wave signal. These
dials are either slaves from master clock systems or
a cheap quartz clock dial with leads to the driver coil. A totem pole
Hank,
You can look at the source code for my Tbolt Monitor to see how I dealt with
that. The link to the source code is in my wiki page:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:gps_monitor
Didier KO4BB
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Neville Michie
Sent: Sunday, October 05, 2008 5:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBolt Monitor
The clock displays are of two types. The
The attached URL is a 11 day plot of a 30.5 GHz carrier taken every minute
by an Agilent 53152A microwave counter. The Mini-T has an ovenized
oscillator. It appears that the GPS attempts to over correct the oscillator,
hence the large frequency excursions. The real large excursions, around the
96
Hal and others,
I am sure that if one could accumulate mains cycles long enough, a
reasonable level of accuracy could be obtained, but you need to ask
yourself (1) to what standard is this 'reference' traceable, and (2)
what happens if there is a power failure?
On this latter point, let's say
Hi Didier,
a time (GPS) and date display would be excellent, the only really
useful enhancement might be a
60th second output, one pulse per minute. That would enable quite a
few useful timing functions
in conjunction with the PPS signal. Outputting the formatted time
data may start to get
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Neville Michie
Sent: Sunday, October 05, 2008 9:25 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBolt Monitor
Hi Didier,
a time (GPS) and date display
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