I've been living with this Nortel unit for over a month now and moved the
antenna all over the place, plus made a different antenna and nothing seems to
change as far as the Osc ppt/div. So I'm giving up and just going to install
the antenna where it seems to get the best signal strength. I th
I did a bit of sleuthing today about my dBc numbers. Looks like my best
numbers happened (47.2 and 44.7) when the antenna was on the shortest piece of
feed line, maybe 30', right above my room but well under the canopy of trees.
Highest dBc I get now is in the low 40's with 150' of feed and t
ject: Re: [time-nuts] New NTBW50AA
LH has provisions for various reset levels; I don't know if they apply to
the Nortel. Try 'r', and see where that leads.
JimT
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go t
LH has provisions for various reset levels; I don't know if they apply to
the Nortel. Try 'r', and see where that leads.
JimT
Sent from *my* galaxy (Nexus).
On Sep 20, 2013 9:03 PM, "quartz55" wrote:
> I'm thinking I was dreaming because it's still at 468, like before. It is
> probably from wh
Amps are cheap from Mouser and have less than 2 dB NF unlike
mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel
antenna but it may be hard to make.
Dave
- Original Message -
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent:
I'm thinking I was dreaming because it's still at 468, like before. It is
probably from when I was moving the antenna around and didn't turn the unit off
and of course I didn't write it down.
Still wondering if holdover can be reset without turning it off.
Happy equinox.
Dave
gt;> I've dropped the idea about choke ring or ground planes after reading what
>>> I could about it. I may try building my own turnstile antenna (ala K7KKQ)
>>> and amp just for fun. Amps are cheap from Mouser and have less than 2 dB
>>> NF unlike mine which is 4
and have less than 2 dB NF unlike
mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel
antenna but it may be hard to make.
Dave
- Original Message -
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 201
oo.
>>>
>>> I've dropped the idea about choke ring or ground planes after reading what
>>> I could about it. I may try building my own turnstile antenna (ala K7KKQ)
>>> and amp just for fun. Amps are cheap from Mouser and have less than 2 dB
>>>
than 2 dB NF unlike
mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel
antenna but it may be hard to make.
Dave
- Original Message -
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Su
mp just for fun. Amps are cheap from Mouser and have less than 2 dB NF
> unlike mine which is 4 dB. Has someone made a DIY helix? I liked the
> pinwheel antenna but it may be hard to make.
>
> Dave
> - Original Message -
> From: Charles Steinmetz
>
Has someone made a DIY helix? I liked the pinwheel
antenna but it may be hard to make.
Dave
- Original Message -
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTB
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of t
I may also look into a DIY choke ring for my antenna. With the large pole I
have now, it will be no problem to put a rather large ground plane under the
antenna if that will help. I'll do some searching on that.
I'll keep the thing running, but I may have to switch it at some point if I get
a
Hi
There is no instruction booklet for the NTBW50's and LH. The program is
targeted at a TBolt. I think it's great that it happens to work at all for the
NTBW50. The stuff about the filter settings has been noted by and posted by
several members here on the list. I've seen it on my units here.
In the Trimble NTBW50 (and Trimble made clones) you can run the auto cal via
LH. The sensitivity is calculated and may appear to change. The settings can
not be saved in flash / eeprom. They do not persist across multiple reboots.
There is no evidence that the NTBW50 actually uses the changed se
ot changing anything of how the Nortel works?
>
> Thanks,
> Dave
> - Original Message -
> From: Bob Camp
> To: Discussion of precise time and frequency measurement
> Sent: Thursday, September 19, 2013 7:23 AM
> Subject: Re: [time-nuts] New NTBW50AA
>
>
screen and
I'm really not changing anything of how the Nortel works?
Thanks,
Dave
- Original Message -
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: Thursday, September 19, 2013 7:23 AM
Subject: Re: [time-nuts] New NTBW50AA
HI
W
HI
What can be said with reasonable confidence:
1) The unit isn't broken and it does not need to go back to RDR under their 30
day return policy.
2) The OCXO isn't broken and it does not need to be replaced.
3) The unit is functioning ok, but probably not as good as it could.
4) Without comparis
Dave wrote:
You didn't say, but I get the feeling maybe I should be getting
smaller ppt numbers? When you say noisy, is high ppt generally a
result of excess noise (front end NF)?
Hard to say about the ppt numbers -- my TBolts give somewhat lower
numbers than you are getting, but they use
Hi
1) Have you done a 3 day long survey at any of the locations? You need to do
that to get the errors down.
2) Fiddling with the gain and filter settings on a NTBW50 isn't useful. The
unit does *not* work the same way as a TBolt. Just leave them alone.
3) Because of the way the uint works ther
Thanks Charles,
I have tried the &a command and that is where LH put the numbers, TC from 100
to 500, Damp from 1.2 (that's how it came) to 1.0, and it changed the gain from
1.2 to 1.403. I could certainly try playing with the DAC voltage. I haven't
written anything to the prom yet, I think, w
I still get generally about a 400 ppt swing with
the OSC, about 20 ns swing with the PPS and the
other things are just what they are. Different
filters and surveys don't seem to change anything that I've seen.
* * *
Is this acceptable?
You seem to have a reasonably decent view of t
Moved antenna to fence line on a 10' emt. Nothing much seems to change no
matter what I do, so I guess this is what I'm locked into unless I start
getting carried away. I still get generally about a 400 ppt swing with the
OSC, about 20 ns swing with the PPS and the other things are just what t
8 you would expect to 7/8 inch
Andrew (350').
Lee
- Original Message -
From: "Don Latham"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, September 15, 2013 3:54 PM
Subject: Re: [time-nuts] New NTBW50AA
Lee, if I can make a cou
All of this talk about antenna position has got me thinking about a
better place for my antenna. I live in a rental townhouse and have no
access to the roof and even if I did bringing a cable in from outside
would be difficult, so am pretty much limited to an indoor antenna. My
current anten
y damaging. Never
> forget that you only live once and you do have a perfect right to enjoy
> your
> hobby without fear.
>
> Regards,
>
> Lee A. Mushel K9WRU
>
>
> - Original Message -
> From: "quartz55"
> To: "Discussion of precise
iginal Message -
From: "quartz55"
To: "Discussion of precise time and frequency measurement"
Sent: Sunday, September 15, 2013 12:13 PM
Subject: Re: [time-nuts] New NTBW50AA
. I'm not thrilled having it above the beams, it's the highest metal thing
in the area and most
Yes, I know it's not just the height of the trees, but the distance away and
I'm really only getting 50-60' away at most and the hill is steep, it's about
20° in the worst spots. This is not your flat suburban lot, it's in the
foothills of the Blue Ridge. The only flat spots are where we've ma
Dave wrote:
Well, I could try it down on the fence, but like I say when I get
down there, I'm not sure the visibility above the trees is any
better to the east and west because it's so much lower and the trees
are all 80' high or more.
It's not just the height of the trees, it's the horizont
Well, I could try it down on the fence, but like I say when I get down there,
I'm not sure the visibility above the trees is any better to the east and west
because it's so much lower and the trees are all 80' high or more. Add another
30-40' for the drop and you can see what I mean. Like I sa
Dave wrote:
The only other place I can put it would be about 100' to the south
on the fence line, and unfortunately it's so steep, I've lost about
30' altitude there already. So the farther away I get from the
house to a clearer location, the lower it gets; in about 200 yards
it drops 200'
Well, that's what I'm doing right now. I just want to stabalize it a bit and
make it so I can turn the beams.
- Original Message -
From: Bob Stewart
To: Discussion of precise time and frequency measurement
Sent: Sunday, September 15, 2013 10:40 AM
Subject: Re:
measurement
>Sent: Sunday, September 15, 2013 9:32 AM
>Subject: Re: [time-nuts] New NTBW50AA
>
>
>The only other place I can put it would be about 100' to the south on the
>fence line, and unfortunately it's so steep, I've lost about 30' altitude
>there alr
through the SP command.
Dave
- Original Message -
From: Bob Camp
To: Discussion of precise time and frequency measurement
Sent: Saturday, September 14, 2013 1:40 PM
Subject: Re: [time-nuts] New NTBW50AA
Hi
As long as the wind does not blow the tow
-nuts-boun...@febo.com] On
Behalf Of quartz55
Sent: 14 September 2013 18:26
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] New NTBW50AA
Here's a better view of the antenna looking due south.
http://i251.photobucket.com/albums/gg287/
Hi
If you mostly keep the beams pointed into the wind, I'd do that before you do
the next survey.
Bob
On Sep 14, 2013, at 2:59 PM, "quartz55" wrote:
> If it's on the top of the antenna mast, it should only rotate around the
> mast, which may be 4" at most. I can stabalize the mast a bit with
If it's on the top of the antenna mast, it should only rotate around the mast,
which may be 4" at most. I can stabalize the mast a bit with a outrigger at the
bottom which I've been meaning to do for years. The pipe from the chimney is
1" thick wall, so there isn't much wind effect there, I for
> I get a spread of around 300ppt, that means I'm always within
> 300x10^-9 Hz of 10MHz or .0003Hz at 1GHz?
Note "300 ppt" is a "fractional frequency", unit-less value, so
at 10 MHz, 300e-12 * 1e7 Hz = 0.003 Hz
at 1 GHz, 300e-12 * 1e9 Hz = 0.3 Hz
> I suppose the ppt spread is pretty much a func
Hi
As long as the wind does not blow the tower around, that's probably your best
location.
Bob
On Sep 14, 2013, at 1:26 PM, "quartz55" wrote:
> Here's a better view of the antenna looking due south.
> http://i251.photobucket.com/albums/gg287/DogTi/abovebeamssouth_zpsd8fb78ca.jpg
>
> Dave
>
Hi
On Sep 14, 2013, at 12:45 PM, "quartz55" wrote:
> Today I moved the antenna to above the beams. This is temporary because it's
> in the way of the beams turning. I guess I need to get someone out here to
> help me install it on top of the beam mast. I don't feel confident to do it
> my
Here's a better view of the antenna looking due south.
http://i251.photobucket.com/albums/gg287/DogTi/abovebeamssouth_zpsd8fb78ca.jpg
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinf
Today I moved the antenna to above the beams. This is temporary because it's
in the way of the beams turning. I guess I need to get someone out here to
help me install it on top of the beam mast. I don't feel confident to do it
myself anymore. I suppose it's not going to hurt anything if onc
Yeah, that's what I'm worried about, I've got enough lifetime supplies of junk
around here now.
Oddly enough some were replacements for other "lifetime" supplies that got
used up….
Bob
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscrib
x27;.
>
> Dave
> - Original Message -
> From: Bob Camp
> To: Discussion of precise time and frequency measurement
> Sent: Thursday, September 12, 2013 5:59 PM
> Subject: Re: [time-nuts] New NTBW50AA
>
>
> Hi
>
The LH OSCdisplay is measuring 'parts per trillion/div' of what? Sorry for the
basic question, but I have not found it. At least I figured out it was
trillion, not thousand.
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
September 12, 2013 5:59 PM
Subject: Re: [time-nuts] New NTBW50AA
Hi
Looks like RG-6 Quad Shield is about $50 for a 500' spool at the local big
box stores.
Bob
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://ww
Hi
Looks like RG-6 Quad Shield is about $50 for a 500' spool at the local big box
stores.
Bob
On Sep 12, 2013, at 10:10 AM, quartz55 wrote:
> OK, I cleaned up the connectors and it's working again at the new location.
> As soon as I get into town, I'll get some new coax.
>
> Dave
> ___
OK, I cleaned up the connectors and it's working again at the new location. As
soon as I get into town, I'll get some new coax.
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/tim
Will too long a cable run or too many connectors (2) result in "antenna open"?
When I added the last 50' of cable that's what I got. I measure 5V at the end
of the cable run though. Maybe some de-ox in the connectors will help? I can
also go get a single long run instead of piecing it togeth
Hi
As you do these surveys, write down the results. You probably will do several
surveys on each antenna location before you are done. Looking at the variation
between the results will give you an idea of what's going on.
Bob
On Sep 11, 2013, at 9:48 PM, quartz55 wrote:
> I ordered a couple
I ordered a couple of the temp chips, but it's going to be low on the list of
priorities.
Tomorrow I'll add another 30' of cable and mount the antenna on the kitchen
vent which is right on the south end of the house above the deck, lower but
southeast from the beams by 25' or so. I think that'
Hi
Ideally you would like the position error to be under 10" for the device to
work at it's best. That's probably going to equate to a couple of inches of
error in X, Y, and Z. Since GPS has cyclical errors, you need an average over
a few days to get to that level.
Bob
On Sep 11, 2013, at 1
The lat lon did change when I did the survey. On google, the lat lon is real
close, a foot or so for the before position and after also. It certainly
doesn't march around the neighborhood looking, the last survey must have only
taken a few minutes. As far as antenna position, I guess maybe I
Oh, the XRef from VK3HZ is at the PO, I'm going to go get it.
Dave
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
I am tempted to use the monty python exhortation "Start again"
If I am reading your screen shots correctly the 01:51:57 UTC shot is before the
antenna move and the 14:02:03 one after the move.
HOWEVER, both shots show the same saved position. That is certainly not going
to be optimal. You shou
na in
any direction.
ws
*
- Original Message -
From: "quartz55"
To: "Discussion of precise time and frequency measurement"
Subject: Re: [time-nuts] New NTBW50AA
Thanks Charles,
I'm not certain myself it it's the temp chip or the w
ob - AE6RV
>
> From: WarrenS
>To: Discussion of precise time and frequency measurement
>Sent: Wednesday, September 11, 2013 12:10 PM
>Subject: Re: [time-nuts] New NTBW50AA
>
>
>
>Dave
>
>With your GPS Antenna sitting underneath
Well, this is interesting, after moving the antenna and doing a new survey, the
OSC ppt has gone down quite a bit. Looky here, you can see the before, the
survey and after ppt
http://i251.photobucket.com/albums/gg287/DogTi/time/survey11sep_zpsff5a5b58.jpg
Would a precision survey do any bette
Lady Heather just reports the data the the unit sends, so the precision that
it sends it. Garbage in, garbage out...
When the program is down-scaling a plot in time, it just skips data points
unless display filtering is on (F D command). Then it forward averages the
next *n* data points f
I heard from RDR electroncis this morning and he says, like Arthur says, the
older chips work better with LH. I'm just not going to worry about it for now.
He was willing to take it back, but I'm not going to do that.
Dave
___
time-nuts mailing list
Thanks Charles,
I'm not certain myself it it's the temp chip or the way LH handles the
information. It doesn't matter like you say, there's no use doing any
measurements with the unit unlocked.
Otherwise here is a trace while I moved the antenna. Any comments on how it
reacted in holdover?
h
Geee, what's so hard to understand? As I said several times before, the
firmware on these units can only read the temperature sensor to 1 degree
increments (there is a 0.25C offset). The temperature "jumping around" is the
temperature crossing the 1 degree C quantization threshold. Most
Dave wrote:
I set the temp scale to 250m°C/div last night
and it remained steady for quit a while, but
then it started the jumping again. It seems to
jump on 1° increments, like from 37.750 to
38.749 in less than 1 minute, but there are step
variations during the 1° movements.
I do not k
I set the temp scale to 250m°C/div last night and it remained steady for quit a
while, but then it started the jumping again. It seems to jump on 1°
increments, like from 37.750 to 38.749 in less than 1 minute, but there are
step variations during the 1° movements. So what you're saying is it
Hi
Ok, you have an unusually well controlled environment in your shack.
The pops are the temperature just barely making it to a 1 C excursion. Think of
your temperature as a sort of sine wave. The pops are the peaks of the sine
wave.
Bob
On Sep 10, 2013, at 10:02 PM, quartz55 wrote:
> Well
>"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
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
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
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/ma
>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
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
Message -
From: gandal...@aol.com
To: time-nuts@febo.com
Sent: Tuesday, September 10, 2013 10:02 AM
Subject: Re: [time-nuts] New NTBW50AA
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 dec
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
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
- Original Message -
From: gandal...@aol.com
To: time-nuts@febo.com
Sent: Tuesday, September 10, 2013 10:02 AM
Subject: Re: [time-nuts] New NTBW50AA
Hi Mark
I'm currently monitoring two of these units with LH running on two separate
PCs and temperature for
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
e-nuts@febo.com
Sent: Tuesday, September 10, 2013 9:03 AM
Subject: [time-nuts] New NTBW50AA
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.
--
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
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 have a slightly earlier version, or a close cousin, of the NTBW50AA that
I modified and I've posted photos of it on this list before:
http://i906.photobucket.com/albums/ac262/rjb1998/NTPB15AA05.jpg
The LH plot from the NTBW50AA by quartz55 doesn't look quite right. Here
is a LH plot from my N
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 supposing now that I can assume
that the best frequency accuracy I
Look at the comments at the start of the heather.cpp in your Lady Heather
installation directory for what there is of ducumentation.
Your temperature readings are bouncing around because the temperature sensor is
only providing readings quantized to 1 degree C. This is usually due to the
GPSD
Hi
On Sep 9, 2013, at 1:56 PM, "quartz55" wrote:
> I moved the antenna, and did a new standard survey which took an hour and
> then another 5 minutes or so to lock. The sats don't seem to be any less
> right under the trees. You can see the antenna and trees here.
> http://s251.photobucket.
Hi
On Sep 9, 2013, at 9:14 AM, "quartz55" wrote:
> Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are
> you telling me this TBolt is no better than the Rb standard, as far as
> stability and perhaps worse?
It may not or may not be any more stable than your LPRO. You c
I moved the antenna, and did a new standard survey which took an hour and then
another 5 minutes or so to lock. The sats don't seem to be any less right
under the trees. You can see the antenna and trees here.
http://s251.photobucket.com/user/DogTi/library/time?sort=3&page=1 I'll let it
run
Wait a minute, Bob. I have an LPRO with good reported bulb voltatge. Are you
telling me this TBolt is no better than the Rb standard, as far as stability
and perhaps worse? And the frequency accuracy is also no better and both have
to be compared to a Cs or H Maser to be calibtated? I though
Hi
The only normal use for even second outputs is in a CDMA base station. The same
is true of the multitude of 9.x MHz outputs coming out of the back of that
unit. From what I have seen of LH, there's no real need to play with anything
else on these units. The only thing you might do is to scan
Hi
I think you may be looking at the ADEV and reading more into it than you
should.
It's a table of ADEV vs Tau. The longer you have data for, the larger Tau
(seconds) it will display. It's not getting better as it displays more data it
the table, it's just got more seconds of data.
ADEV sh
The green trace is the oscillator EFC control voltage. It will drift quite a
bit for the next couple of months of continuous usage as the oscillator ages
in. It should settle down after that, but will always be drifting. If it
didn't drift there would be no need for GPS disciplining...
Thanks guys. That's all useful information, I think. I'm still trying to
understand the lingo. The temp trace is still whacking down, but not as much
as before. I guess it's way to early to start complaining about this unit.
The 1 tau is now at 6.4e-12 it seems to be going back up. I
Hi
Temperature stable to < 1/4 C for 2+ hours is pretty good for a normal home
environment…..
Bob
On Sep 8, 2013, at 8:07 PM, Mark Sims wrote:
> It is reporting temperature just fine. It probably has the "new" revision
> temperature sensor chip that the firmware does not read the high res
It is reporting temperature just fine. It probably has the "new" revision
temperature sensor chip that the firmware does not read the high res
temperature properly. Also, one version of those Nortel units (don't
remember which one) doesn't do high res temp readings even with the old rev
t
Hi
Ok, the yellow trace (temperature) still does not look right. Either you have a
lab grade temp chamber to keep stuff in, or it's just not reporting
temperature.
Units and limits and meaning change for ADEV depending on the tau. If you are
looking at 1 tau (which I thought you were) then it
1 - 100 of 135 matches
Mail list logo
