Hi
If the oven runs away, you won't get the nice "DAC voltage settling to a
reasonable value" trace on LH. If it has run away, the appearance is very
distinctive when you open it up. Boards turned brown and highly oxidized solder
….
Bob
On Mar 12, 2013, at 7:35 PM, Rex wrote:
> Do you think
4:35 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Do you think that the oven is working correctly? Is the DC current high on
power-up then dropping to a steady lower value after warm-up time?
My concern is that the resistors may have
Do you think that the oven is working correctly? Is the DC current high
on power-up then dropping to a steady lower value after warm-up time?
My concern is that the resistors may have unsoldered themselves because
the oven ran away into an over-temp condition.
On 3/12/2013 9:55 AM, Garren Da
-nuts@febo.com
Subject: [time-nuts] Lady Heather numbers
>Garren Davis garren.davis at qlogic.com Tue Mar 12 12:55:48 EDT 2013
>
>I found the 1 ohm resistor from the 12 volt pin to the heater circuit
>popped off its solder pads and was laying between the insulation and
>the
>Garren Davis garren.davis at qlogic.com
>Tue Mar 12 12:55:48 EDT 2013
>
>I found the 1 ohm resistor from the 12 volt pin to the heater circuit
>popped off its solder pads and was laying between the insulation
>and the metal enclosure.
++
You might want to check the 2 photos
: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Bob,
Took your advice and ordered another OCXO. While waiting for it I decided to
cut open the
OCXO with a bad heater that came with the thunderbolt. I found the 1 ohm
resistor from the
12 volt pi
Yeah, that sort of hit me after reading through the code. I enabled the control
lines in my serial to IP adapter and will hook up a fan in the box setup and see
if I can things to be more stable.
On 3/8/2013 6:11 PM, Charles P. Steinmetz wrote:
Peter wrote:
I am not convinced the temperatu
Peter wrote:
I am not convinced the temperature control in mine is functional.
Temperature control is a capability within Lady Heather (not the
Tbolt itself) and requires external hardware (e.g., box and fan) to implement.
Best regards,
Charles
_
Hi Peter,
first of all, LH can only 'control' temperature, if it has a hand to do
so.. meaning it can steer the RTS line of the RS232 to control a small
fan via PWM. Actually, it could also heat (by putting there a heating
element) but I haven't seen anybody doing it yet. If there is no heater
I am not convinced the temperature control in mine is functional. For example,
the temperature target seems to not do anything at all. With the box insulated
the internal temperature is around 46 C and nothing changes if I set that number
to 40 or 50 C, it is still around that 46 plus or minus
Peter,
I did let the internal algorithm make it's optimization (can't remembere
which key sequence it was) once everything has settled. The lab here has
2-3 degC ambient variations over the day, but putting the Thunderbolt in
a box which is ventilated (well.. fan-ed) by the LH temperature
cont
Achim,
Did you change any temperature controller settings from default values? I am
seeing about a 10:1 correspondence between ambient changes and internal reported
temperature movement.
Peter
On 3/7/2013 12:32 PM, Achim Vollhardt wrote:
Hi Garren,
just as an example, what can be done wit
Hi Garren,
just as an example, what can be done with the LH internal temperature
controller:
http://gulp.physik.uzh.ch/heather/
Hardware pictures can be found here:
http://gulp.physik.uzh.ch/heather/pics/
Achim
___
time-nuts mailing list -- time-n
Garren wrote:
Can anyone tell me how to turn off the satellite display on the
lower right of the display?
In the "Graph" menu (type "g"), you have three choices for displaying
the ADEV tables and/or the satellite map: ADEV tables only (type
"a"), Map only (type "m"), or Both (type "b"). You
Hi
Get a new OCXO
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Garren Davis
Sent: Tuesday, March 05, 2013 4:39 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Thanks
m] On Behalf
Of Bob Camp
Sent: Tuesday, March 05, 2013 9:01 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Your dac voltage is still swinging 20 to 25 mV over the period (4 to 5
divisions at 5,000 uV per division). It tracks
half Of Garren Davis
Sent: Tuesday, March 05, 2013 11:04 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
I think I have my temperature problem fixed. I have included a 24 hour
graph. Comments welcomed.
I also did a 48 hour survey. I have more
On Sat, Mar 2, 2013 at 7:14 PM, Peter Gottlieb wrote:
> The antenna has a pretty clear sky view right now. I have about 75 feet of
> cable, 25 feet that came attached permanently to the antenna, might be
> RG-59, and a 50 foot extension which is a new piece of good quality RG-6
> CATV cable.
>
>
Peter wrote:
The antenna has a pretty clear sky view right now. I have about 75
feet of cable, 25 feet that came attached permanently to the
antenna, might be RG-59, and a 50 foot extension which is a new
piece of good quality RG-6 CATV cable.
Perhaps the antenna (came with the tbolt in the
as no direct effect on the Dac control voltage
unless the Tbolt is in hold over.
The Dac voltage changes because the oscillator's freq is trying to change, not
the other way around.
You can disable the Dac from changing with "dd".
ws
****
From: "Garren Davis&
t is possible with good setup.
>>>
>>> Concerning your Dac comments, Yes makes sense, but your conclusing is wrong.
>>> Can't say or sure, because the 24 Hr + screen shot is not shown, but in
>>> general
>>> The Tbolt temperature reading has no direct eff
****
From: "Garren Davis"
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok
that I attached a screen dump of what I have. Can anyone comment on the
picture. It's been
running less than a
r + screen shot is not shown, but in
>> general
>> The Tbolt temperature reading has no direct effect on the Dac control
>> voltage unless the Tbolt is in hold over.
>> The Dac voltage changes because the oscillator's freq is trying to change,
>> not the other
oscillator's freq is trying to change, not
the other way around.
You can disable the Dac from changing with "dd".
ws
From: "Garren Davis"
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over
t; Garren
>
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
> Behalf Of Bob Camp
> Sent: Wednesday, February 27, 2013 12:12 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts]
oun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent: Wednesday, February 27, 2013 12:12 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
The TBolt does not use the temperature monitor when in locked mod
Garren wrote:
I don't doubt that my oven could be the problem but I would think a
lot of people have their tbolts sitting in a room or basement with a
lot more temperature swing than 2.5C. I also monitor the inner oven
temperature where the oscillator is located and it remains stable at
67C r
Garren Davis
Sent: Wednesday, February 27, 2013 1:20 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
I don't doubt that my oven could be the problem but I would think a lot of
people have their tbolts sitting in a room or basement with
There has been a lot of speculation about the innards of the OXCO in the
Thunderbolt so here is what I found inside a dead one that I opened. I
didn’t trace the circuit out so most of the description that follows is just
from a cursory look and may not be totally correct. Below are links to a
coupl
power supply. It's probably a bit noisy.
Garren
-Original Message-
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]
On Behalf Of WarrenS
Sent: Tuesday, February 26, 2013 10:53 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-n
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent: Wednesday, February 27, 2013 9:49 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
The temperature of your TBolt is moving 2.5 C. The OCXO frequen
x27;s lack of a proper oven.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Garren Davis
Sent: Wednesday, February 27, 2013 10:27 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather nu
Hit the f key then the l key.
Garren
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Peter Gottlieb
Sent: Tuesday, February 26, 2013 4:37 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady
How does one set the AMU value with LH?
On 2/26/2013 12:05 AM, Chuck Harris wrote:
To quote WarrenS:
To allow the Tbolt to work with weak signals from any antenna that I've tried,
even when indoors, I start by setting the TBolt's AMU level from the default
of 4
down to 0. This can be done w
***
From: "Garren Davis"
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok
that I attached a screen dump of what I have. Can anyone comment on the
picture. It's been
running less
.com] On
Behalf Of Bob Camp
Sent: Monday, February 25, 2013 4:24 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Useful link:
http://www.ke5fx.com/heather/readme.htm
For a screen command list hit space. Poking around at them can be fun!
That should be that v360, Not dxxx to set the View Display time
use "space" or "?" for Tbolt help screens
Garren posted
I notice that whenever a satellite drops out
it causes the oscillator white trace and the DAC green trace to jump
around.
I wonder why that happens when there are 6 other g
se time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Hi
The unit should not be overly sensitive to temperature. I'd guess that your
improvised oven isn't holding temperature very well. The original likely held
things to within < 0.1 C at some target in the 85
Bob Camp
Sent: Monday, February 25, 2013 4:24 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Useful link:
http://www.ke5fx.com/heather/readme.htm
For a screen command list hit space. Poking around at them can be fun!
To get into the
25, 2013 7:41 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
From the attachment I see he is near LA with a nice house with a kidney shaped
pool :-)
Raj
At 26-02-2013, you wrote:
>If I am not mistaken (and I could be), the Lat/Long
if it was for different OCXO models.
>>>
>>> Anyways I wanted to see if my homebuilt oven could match a commercial
>>> product. It was built
>>> from a 73 Amateur Radio magazine article over 10 years ago.
>>>
>>> Garren
>>>
>>>
>>> --
from a 73 Amateur Radio magazine article over 10 years ago.
Garren
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent: Monday, February 25, 2013 2:11 PM
To: 'Discussion of precise time and frequency measurement'
Su
Garren posted
>I notice that whenever a satellite drops out
>it causes the oscillator white trace and the DAC green trace to jump around.
> I wonder why that happens when there are 6 other good satellites.
The main causes of this is a poor location setting, (do a 24 + hr survey)
or the TBolt
To quote WarrenS:
To allow the Tbolt to work with weak signals from any antenna that I've tried,
even when indoors, I start by setting the TBolt's AMU level from the default of
4
down to 0. This can be done with the Tbolt S/W or LH.
My general AMU setting goal is to make it low enough so that
nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
>Behalf Of Garren Davis
>Sent: Monday, February 25, 2013 11:00 AM
>To: Discussion of precise time and frequency measurement
>Subject: [time-nuts] Lady Heather numbers
>
>
>Hi,
>
>I have been playing with my thunde
bo.com] On
> Behalf Of J. L. Trantham
> Sent: Monday, February 25, 2013 4:28 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Lady Heather numbers
>
> OK. Found the problem. Google Earth defaults to 'East' not 'We
PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
OK. Found the problem. Google Earth defaults to 'East' not 'West'. Forgot to
tell it North/South, East/West.
Looks like your antenna is near the apex of yo
cise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
If I am not mistaken (and I could be), the Lat/Long suggests that you are in
China. Is that correct?
Joe
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf O
Sent: Monday, February 25, 2013 11:35 AM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Lady Heather numbers
>
> Hi
>
> Based on a very short display time, nothing looks seriously broken. I'd
> suggest running the OCXO cali
t: Monday, February 25, 2013 2:11 PM
> To: 'Discussion of precise time and frequency measurement'
> Subject: Re: [time-nuts] Lady Heather numbers
>
> Hi
>
> A "typical" TBolt OCXO will settle out with a control voltage that's slightly
> positive (ma
1:00 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok that I attached a screen dump of what I have. Can anyone comment
on the picture. It'
[mailto:time-nuts-boun...@febo.com] On Behalf
Of Garren Davis
Sent: Monday, February 25, 2013 12:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Thanks. I worry a little bit because my setup is not the normal thunderbolt
running on
#x27;Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Based on a very short display time, nothing looks seriously broken. I'd
suggest running the OCXO calibration routine at some point. Everything is
still warming up / settling out
time and frequency measurement
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok that I attached a screen dump of what I have. Can anyone
comment on the picture. It's been running less than a day and I
Garren Davis
Sent: Monday, February 25, 2013 12:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lady Heather numbers
Thanks. I worry a little bit because my setup is not the normal thunderbolt
running on the
shelf or a rack. The oven for my oscillator is broken
of precise time and frequency measurement'
Subject: Re: [time-nuts] Lady Heather numbers
Hi
Based on a very short display time, nothing looks seriously broken. I'd suggest
running the OCXO calibration routine at some point. Everything is still warming
up / settling out for the first
time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Garren Davis
Sent: Monday, February 25, 2013 12:00 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Lady Heather numbers
Hi,
I have been playing with my thunderbolt and Lady Heather ove
Hi,
I have been playing with my thunderbolt and Lady Heather over the weekend. I
hope it's ok
that I attached a screen dump of what I have. Can anyone comment on the
picture. It's been
running less than a day and I don't know if what I have would be considered
good as far as
accuracy and stabi
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