Hi,
I have just spent a week or two trying to talk to a Trimble Thunderbolt.
I have a laptop running VISTA, about which there is little to say.
The laptop has no serial ports, but I have some USB/Serial converters
that successfully run
my HP 3815A and a Samsung GCRU/D, and also communicate with
Gents,
after my credit card had been cashed by TAPR some days before I knew I
was one of the people to receive a Thunderbolt. Today I took it out from
the customs, saw that the power supply matches German power line
conditions, connected it to my GPS splitter and fired it up.
According to
It's only accurate once every 5 minutes, but it's more entertaining than
watching a caesium box :)
http://news.bbc.co.uk/1/hi/technology/7625815.stm
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Hi Neville,
I use USB-Serial converters. Brand isSweex, there is a common
USB2serial chip inside. There was no need to modify anything (pull up
resistors or what so ever).
First I had communication, but from time to time strange behaviour. It
made me think the Thunderbolt was faulty... I
Gentlemen
I have been somewhat out of the picture in recent months,and missed out on
the supply program. I gather that there is general satisfaction with the
Trimble Thunderbolt. May I ask if you will be having any more purchase
opportunities for this item. I would be pleased to have the
Nevil:
In my business we use/ supply serial to parallel converters for
programming our product originally designed for serial. We ran into
most of the problems you have described. The hanging appears to be a
windows problem (we use XL pro mostly). Ours uses the Prolific
converter and
I had the same problem with some other devices, and I took apart
several converters.
Most of them were unable to generate sufficient levels for a proper
communication with rs232.
Internal charge pump was generating +-6V instead of +-12 or +-15
that is normal for rs232.
Putting additional
Predrag,
I had always thought that Recommended Standard 232 calls the region from
-3 to +3 volts a disallowed state and suggests to use at least +/- 5 V
levels so that +/- 6 V should be absolutely conform with RS232.
Fortunately - or unfortunately ? - all modern RS232 receiver chips have
a
Well.. Non standards conforming RS-232 devices are hardly new..
But.. The standard just says -3 to +3 is a no defined behavior zone, and that
the receiver should be able to accept +/- 15 V, with a damage threshold of +/-
25V. (bear in mind, also, RS232C is in 1969, the latest is TIA-232-F, in
Hi Neville,
I do run my Thunderbolt very successful for quite a while and I do use either
my stationary PC (running still with Win2000 on com1 or 2) or with my Laptop
(Lenovo T43p with Win XP pro and USB2 ports) and had
never a connection problem. For the connection to the USB port I use in
Lux,
my hardware experiences confirm that +-6V is marginal. Some devices
work, some do not.
The problem is a charge pump chip inside the converter and not the
Prolific interface chip itself.
(It generates ttl levels anyway).
All converters I saw till now are two chip solutions (usb chip
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Predrag Dukic
Sent: Wednesday, September 24, 2008 1:23 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] TBOLT communication
Lux,
my hardware experiences
Hello time-nuts,
I have recently acquired a Datum TS2100-IRIG NTP time server. Nice
unit, and I do have IRIG-B to feed it, however, reading the manual I
notice that there is a GPS version as well. Upon taking the top of the
unit off I notice that there are the connector and standoffs for both
Not only that. The TTL are more frequently 3.3V TTL, and the TTL to
RS-232 converters are supplied from 3.3V and uses a charge pump doubler
and a charge pump inverter. Barely +/-6V. Usually they are designed for,
and use, 100nF capacitors... the less expensive ones :) And a bigger
capacitor
One of the converters didn't have any voltage
pre-regulation for both the chips, and also one
of my pcs gives 6 volts on USB ports
That combination worked the best and could talk
to virtually all my rs232 devices. I don't
remember now the output 232 levels but they were close to 10V
6V x
http://www.wulffmorgenthaler.com/default.aspx?id=0677b678-369b-4570-80ac-ddb60d2d5c22
What's next? April-fool leap-second?
Cheers,
Magnus
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On Mon, 22 Sep 2008 15:52:19 +1200, you wrote:
RF grounding all three electrodes of the BC860 is not good practice.
The BC860 will tend to oscillate when you do this unless the ESR of the
100uF base bypass cap is large enough.
A standard electrolytic? The ESR is less than stellar, see my
Symmetricom is a sales organization - tech support for non-contract
customers is iffy at best.We use symmetricom NTP servers some of
which have gone obsolete and the only support we get is calls from the
sales dept asking when are we going to replace them (we do have a
contract).
I really
Gerhard Hoffmann wrote:
On Mon, 22 Sep 2008 15:52:19 +1200, you wrote:
RF grounding all three electrodes of the BC860 is not good practice.
The BC860 will tend to oscillate when you do this unless the ESR of the
100uF base bypass cap is large enough.
A standard electrolytic? The
It (LTSpice) has some severe limitations for most of the simulations I
have done.
You might bring those up with Mike Engelhardt (the author). He doesn't miss
many tricks.
These need to be supplemented with on board filtering as they aren't
quite as quiet as you need.
Either the NIST style
Skip,
I'm truly sorry but you have discovered the ultimate Black Hole of
timing information.
had, K7MLR
At 02:15 PM 9/24/2008, you wrote:
Hello time-nuts,
I have recently acquired a Datum TS2100-IRIG NTP time server. Nice
unit, and I do have IRIG-B to feed it, however, reading the manual
Another opinion:
http://blog.longnow.org/2008/09/21/the-chronophage/
That leads to a wiki page:
http://en.wikipedia.org/wiki/Corpus_Clock
The wiki page(s) link to:
http://en.wikipedia.org/wiki/Grasshopper_escapement
http://en.wikipedia.org/wiki/Gridiron_pendulum
Skip Withrow [EMAIL PROTECTED] wrote:
I have recently acquired a Datum TS2100-IRIG NTP time server. Nice
unit, and I do have IRIG-B to feed it, however, reading the manual I
notice that there is a GPS version as well. Upon taking the top of the
unit off I notice that there are the
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