John,
I'm 'late' to this thread as well but I find it very interesting.
In the aviation arena, there are 'storm scopes' that use NDB
(non-directional beacon) technology to establish the direction and spectral
analysis technology to establish the distance (based on the assumption that
the 'lightni
>"I would say the temp sensor is working, but still why those jumps?"
Ah, that new temp plot looks like the 'normal' staircase steps I was
talking about. The previous plot didn't look right with all the little steps
in between. As I mentioned before, and Bob mentioned, any problem with
the ther
Good point.
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Lux
Sent: Tuesday, September 10, 2013 10:28 AM
To: time-nuts@febo.com
Subject: Re: [time-nuts] 82357B GPIB USB from China
On 9/10/13 7:23 AM, J. L. Trantham wrote:
> T
Well, here's a shot with me putting a fan under the bottom of the unit and you
can see the temp immediately start to drop from 39.7 down to 29.7 and then I
take the fan away and it goes back up to 37.7 and now I've let the bottom
breathe which I had blocked off by letting it sit on the bottom.
Hi
It should be measuring ambient temperature. The GPSDO probably uses it as part
of the holdover process. A good blast of room temperature air (heat gun without
the heater on) *should* drop the sensor 5 to 10 degrees.
Bob
On Sep 10, 2013, at 8:43 PM, quartz55 wrote:
> Be a lot easier just t
Be a lot easier just to blow the heat gun on it. What is this sensor
measuring, ambient temperature in the room of something on the board, like the
OCXO or what? It only seems to vary from about 37.7 to 41.7 and it always
seems to change in 1° increments. Is it going to affect how the GPSDO w
Hi
The time constant / oscillator tuning data does not save to eeprom on the
NTBW50 and similar units. Works fine on a TBolt….
Bob
On Sep 10, 2013, at 12:07 PM, Charles Steinmetz wrote:
> Dave wrote:
>
>> Also how do I set the time constant, I can't find it anywhere except if I do
>> the &a
Hi
Simple way to check it:
Let the temperature in the room move over a 10 C range (open a window …). If
the temperature trace does not move the chip isn't doing what it should.
Bob
On Sep 10, 2013, at 5:31 PM, quartz55 wrote:
> Arthur,
>
> Can you tell me where and what the chip is and if
Hi
I have quite a few of these and they all produce temperature plots that look
like proper TBolts. I also have TBolts that don't read the sensor in high
resolution mode. I have a couple TBolts with broken temperature sensor chips.
Assuming the room temperature is varying several degrees C up a
On 9/10/13 8:36 AM, Gerhard Hoffmann wrote:
Am 10.09.2013 16:23, schrieb J. L. Trantham:
Quite the 'dump' of technology. I wonder if there is a USB 3.0 version
coming out soon?
What should that be good for? Using a 350MB/s port to transfer 1MB/s
over the GPIB?
But it looks ever so much coo
Arthur,
Can you tell me where and what the chip is and if there's any way to test it on
the board? I've got a 30 day $ back deal on this thing.
Dave
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I don't know how much expertise there is here, or whether this should be moved
to the HP Agilent board, but the chips inside this thing hidden under the black
goo are as follows: CY7C68013A, NAT9914BPL, DS75162AWM, and DS75160AWM. It
also has some "secret components" under goo but I didn't both
It appears that my adapter is not the same as yours. Thanks anyway.
Bob
>
> From: cfo
>To: time-nuts@febo.com
>Sent: Tuesday, September 10, 2013 3:04 PM
>Subject: Re: [time-nuts] 82357B GPIB USB from China
>
>
>On Tue, 10 Sep 2013 18:19:09 +, cfo wrote:
>Mark Sims holrum at hotmail.com
>Tue Sep 10 09:03:24 EDT 2013
>
>Again, THE TEMPERATURE SENSOR IS NOT BROKEN!! The firmware in
>some of these units (those from NTPX modules) does NOT read the temperature
>sensor in high-res mode.
I have sold over 200 T-bolts and had to replace ab
A little late to the conversation, but there are some relatively low
cost (few hundred dollar) PC-based lightning detector products
available. I run one that's a PCI card with Windows software that
generates a map and statistics that upload to my web page once per minute:
http://www.febo.com/
On Tue, 10 Sep 2013 18:19:09 +, cfo wrote:
> I'm currently playing around with a Beiming GPIB adapter under
> linux-gpib.
> I'm using the SVN version , and i haven't detected any problems yet...
> http://tinyurl.com/prncq7w
>
> I have 2 firmware types , an i2c eeprom image , and an uploadabl
A subject of potential interest. Might have some relevance in the precision
time/frequency arena once it's developed a bit more.
http://bit.ly/17VM3Du
Russ
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On Tue, 10 Sep 2013 13:06:11 -0400, paul swed wrote:
> I am very curious to see if anyone has used one of these $95 wonders.
> I know the prologixs work from older time-nut posts.
> Regards Paul.
>
I'm currently playing around with a Beiming GPIB adapter under linux-gpib.
I'm using the SVN versi
On Tue, Sep 10, 2013 at 1:19 PM, Brooke Clarke wrote:
> The adafruit MTK is the only GPS receiver I've seen that has 10 Hz update
> rates.
Most/all/some of the MTK 33xx parts have up to 10Hz. The UAV sites
are the goto places for aviation doodads.
___
On Tue, Sep 10, 2013 at 11:57 AM, David J Taylor
wrote:
> which is really designed for a different job to the Synergy 6T board. Which
> Adafruit board were you meaning?
That's the one. And yes the MTK3339 with 10Hz updates and built in
data logging is intended for a particular market with zero
Bear with me as I'm currently in hospital but I am selling 6T's and MAX7Q's
which are 10hz. I have break outs etc
More when I'm out of here
Anthony
Sent from my iPhone
On 10 Sep 2013, at 18:19, Brooke Clarke wrote:
> Hi:
>
> The adafruit MTK is the only GPS receiver I've seen that has 10 Hz
No I didn't do the e command. I don't want to write to the prom any more than
I have to at this point while I'm playing with it. Yes, I see the time
constant under the & command now, &t. I knew about the launch / commands, I
just don't know what I want to use at this point, if I want to chang
I am very curious to see if anyone has used one of these $95 wonders.
I know the prologixs work from older time-nut posts.
Regards
Paul.
On Tue, Sep 10, 2013 at 11:36 AM, Gerhard Hoffmann wrote:
> Am 10.09.2013 16:23, schrieb J. L. Trantham:
>
> Quite the 'dump' of technology. I wonder if the
I'm interested in this board, too. In fact I have one, but I don't have the
tools setup to attempt to measure the accuracy of this statement from the
datasheet: "High accuracy 1-PPS timing support for Timing Applications (10ns
jitter)". What exactly does that mean? Does it mean that the 1PPS
Hi:
The adafruit MTK is the only GPS receiver I've seen that has 10 Hz update rates.
Something that's really useful if you're using it in something that flies.
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
David J Taylor wrote:
From: Paul
[]
I
Re the time constant, the only way of changing it I'm aware of is with the
& command, have you tried "e" to save the current configuration?
Regards
Nigel
GM8PZR
In a message dated 10/09/2013 16:19:00 GMT Daylight Time,
quart...@hughes.net writes:
Mine's reporting 6 places too. I get
On 9/10/13 7:23 AM, J. L. Trantham wrote:
There also appears to be a ton of 'genuine' Agilent 82357B's from China some
selling for under $155 with free shipping (to US and UK).
Quite the 'dump' of technology. I wonder if there is a USB 3.0 version
coming out soon?
more likely that most Agile
Dave wrote:
Also how do I set the time constant, I can't find it anywhere except
if I do the &a command but it resets back to 100s with a new start.
Does the TC not get saved when you "save to EPROM"? It does with a
Thunderbolt.
Also, a number of people have expressed confusion with making
Am 10.09.2013 16:23, schrieb J. L. Trantham:
Quite the 'dump' of technology. I wonder if there is a USB 3.0 version
coming out soon?
What should that be good for? Using a 350MB/s port to transfer 1MB/s
over the GPIB?
regards, Gerhard
___
time-nut
Hi,
I have a a small correction to my message, I was talking from memory.
After checking with the real thing I found that 2 commands are needed:
One for turning the yellow LED (Comm fault) off and other for turning
the Green one (Normal) on.
Ignacio EB4APL
On 10/09/2013 13:47, EB4APL wrote
From: Paul
[]
I must have sounded too specific. I wasn't talking specifically about
the 6T or about interfacing to a .
Recently someone spoke of acquiring the Adafruit MTK eval board for
pps, NTP and a 10MHz source. I think the Synergy 6T eval board is a
superior choice in that case. And in ma
Mine's reporting 6 places too. I get these 'big' variations, but it only moves
from 38.7 to 41.7 C. Is this pretty normal?
Also how do I set the time constant, I can't find it anywhere except if I do
the &a command but it resets back to 100s with a new start.
Dave
- Original Message ---
On Tue, Sep 10, 2013 at 12:29 AM, David J Taylor
wrote:
> It still consumes more power, takes more effort to interface to the
> Raspberry Pi, results in a bigger overall assembly, doesn't come with an
> antenna,
I must have sounded too specific. I wasn't talking specifically about
the 6T or abo
I bought one of these but have not yet gotten it to work on Linux. I tried
with gpib_linux for awhile, but shelved it to go back to work on my GPSDO PLL
project. I managed to get as far as a working gpib_config command, but the
software doesn't seem to actually be sending data through the ada
There also appears to be a ton of 'genuine' Agilent 82357B's from China some
selling for under $155 with free shipping (to US and UK).
Quite the 'dump' of technology. I wonder if there is a USB 3.0 version
coming out soon?
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailt
Hi Mark
I'm currently monitoring two of these units with LH running on two separate
PCs and temperature for each is being reported to six decimal places, does
this mean LH is in some way interpolating the higher resolution readings?
Regards
Nigel
GM8PZR
In a message dated 10/09/2013 1
OK, I believe you Mark. I do wonder why the DAC and OSC traces on Authur's
unit are much smaller than mine though. Seem to be in the same units. I'll
check it in a month or so.
I was thinking last night that it wouldn't be much to move the antenna over to
where it's open straight up and to t
My apologies if this is in the archives. I could not find any discussion about
it.
A seller on Ebay is offering a USB-GPIB interface equivalent to the Agilent
82357B:
http://www.ebay.com/itm/82357B-GPIB-USB-Interface-Compatible-with-AGILENT-82357B-/261270515849?pt=LH_DefaultDomain_0&hash=ite
Yes, it's like anything else - different models, different sellers,
tested or not, different ideas on the value of the box. I've seen
prices for DTS models from about $600 and up, although there's a 'U.S.
only' lower-end unit selling for $300 that looks like it's working . By
the way, these t
HagaaarTheHorrible wrote:
Hi there,
I hope this is the correct way to post here and that its not been covered
before. I've read some threads about frequency dividers, but didn't really find
all the answers I'm looking for.
I'm trying to generate a 10kHz sine wave thats as clean as possible, a
I looked them up on the payme site and $3500. I wasn't sure what they
actually were until that point. Actually seem great for time-nuts to
measure drift.
Sucks lots O power, has lots O weight, generates heat. Nothing better.
Regards
Paul
WB8TSL
On Tue, Sep 10, 2013 at 3:52 AM, David C. Partridge
Again, THE TEMPERATURE SENSOR IS NOT BROKEN!! The firmware in
some of these units (those from NTPX modules) does NOT read the temperature
sensor in high-res mode.
--
Your temperature plots look like mine. I suspect the other unit has a brok
Dave,
I have a cousin of your GPSDO, a NTGS50AA whose main differences are
that in this unit the DB-9 connector and the LEDs are in a separate
board connected by a flat cable, and that this unit is meant for -48
volts systems only.
The yellow light indicates that it is not in communication w
Hi there,
I hope this is the correct way to post here and that its not been covered
before. I've read some threads about frequency dividers, but didn't really find
all the answers I'm looking for.
I'm trying to generate a 10kHz sine wave thats as clean as possible, as it will
be a reference si
Hi
Ok, I'd agree that there is a slight advantage to running 24 volts instead of
48 volts. I don't think I'd toss out a 48 volt supply setup, but if you're
buying a new supply 24 looks like the better choice.
Bob
On Sep 10, 2013, at 5:48 AM, gandal...@aol.com wrote:
> I've monitored the power
Hi
Your temperature plots look like mine. I suspect the other unit has a broken
temperature detection chip. I've seen that happen on TBolts.
Bob
On Sep 9, 2013, at 10:44 PM, Arthur Dent wrote:
> I have a slightly earlier version, or a close cousin, of the NTBW50AA that
> I modified and I've
Hi
On Sep 9, 2013, at 10:31 PM, quartz55 wrote:
> OK, did a bit more reading. I already understand the difference between
> accuracy and stability however.
>
> I thought ADEV was some sort of measurement of accuracy, but I understand now
> it is a measure of stability over time. I'm suppos
I've monitored the power input against voltage for a couple of the uncased
versions of these units, both fitted with Datel TPB-5/5-12/1-Q48 power
converters and both well "warmed up", and it does increase somewhat with
increasing input voltage.
On both units the input power to the DC to DC
Wow, where do I get one and how spendy are they?
Cheers
David Partridge
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Ed Palmer
Sent: 10 September 2013 05:34
To: Discussion of precise time and frequency measurement
Subject: [time-nut
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