Hi
The temperature of your TBolt is moving 2.5 C. The OCXO frequency directly
follows this temperature. The OCXO is likely moving 3 ppb as the temperature
changes by 2.5C. That drives the PPS back and forth.
Put another way - most of what you see is related to the problem with the
OCXO and it's
I am considering getting a counter with better resolution than my 5316A,
and have been looking at 5335A, they seem to be quite capable and fit my
budget, but I have some questions about options.
1. How useful is the option 020 DC voltmeter? Does it offer good
resolution?
2. Is the option 040
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 regardless of
Garren
The 34 hr plot helps a lot to see what is going on.
First off let me say what you have is working fine for most any real
application,
but if you want to be extreme time nuts, there are lots of improvements that
can be made.
In no special order.
1) Signal level is about 10 dBc lower
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
Hi
The TBolt does not use the temperature monitor when in locked mode. Your
OCXO is changing temperature. Roughly a 0.008 C temperature change would
explain the movement you see.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of
Hello all:
I am an electronic technician with 30+ years experience fixing
computers. In my spare time I like to play with old computers and
electronics. Recently I got bit by the precision timing bug, partially
after running across the wonderful leapsecond.com site, which lead me
here.
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
These are nice counters, but they're slow. My 5335A takes ~ 6 seconds to
do a full resolution measurement.
-Bob
On Wed, Feb 27, 2013 at 11:09 AM, Paul Berger phb@gmail.com wrote:
I am considering getting a counter with better resolution than my 5316A,
and have been looking at 5335A,
Opps, Now your confusing me. You say the tbolt does not use the temperature
monitor when in locked mode. In your previous message you said The temperature
of your TBolt is moving 2.5 C. The OCXO frequency directly follows this
temperature. Do you mean the inner oven is changing .008C because
Hi Paul, I recently purchased a very clean 5334B, which I then decided to
drive with a Thunderbolt GPSDO, thanks to input from this community,
because I wanted accuracy to the least significant digit. The OCXO in the
5334B was off by 13 Hz (know that now, not then) but for the price of a
Hi, Paul. Glad to see you made it here. For the time-nuts; Paul and I
have spoken about these issues, and I have had similar experience. The
only thing I would add is the the spikes to seem to occur less
frequently with a better antenna placement, but when they start to
cluster, they fire off one
I've decided to list my FTS-4060 on ebay, item# 151004036331
No reserve, 10 days.
Notices tacked on the local telephone poles just have not
resulted in much interest.
Chris
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Chris
I have no doubt someone will snap it up even for a re-sale. Some dealer.
The best of luck to you. Nice unit
Paul
WB8TSL
On Wed, Feb 27, 2013 at 6:01 PM, Chris Howard ch...@elfpen.com wrote:
I've decided to list my FTS-4060 on ebay, item# 151004036331
No reserve, 10 days.
Notices
Hello,
This is my first message here although I read this list for a few weeks.
I bought a Z3805A/58503A frequency receiver and I didn't notice on the
pictures that the model number was not written on the front panel. It's not
important but is there a reason for that, if you know ?
The item
Hello Claude,
that gap is a classic crystal jump. It could be caused by the crystal
changing frequency by itself, or by being hit with e.g. gamma particles etc.
Could also have been instigated by vibration or shock to the unit.
You should be seeing 6+ sats at all times though, your plot
Hi
Your makeshift oven is changing = 0.008C when the ambient temperature changes
2.5C. The frequency of the OCXO tracks the temperature as reported by the
TBolt's sensor. It is NOT being controlled by the TBolt's sensor.
Bob
On Feb 27, 2013, at 5:43 PM, Garren Davis garren.da...@qlogic.com
Sounds like a bad OCXO. The crystal frequency jumps slightly, and the
disciplining loop then has to compensate by steering the DAC voltage
through the loop filter. If that's the problem it may get better if you
leave it running for a few more weeks.
The smoking gun is the attack/decay
Hi Claude!
Said says, you should see 6+ sats, I guess he means _at_least_ six. I'm
almost sure, you've got a 6 channel receiver, so you naturally cant't
get more than 6 sats at a time.
There are some different models of the Z3805A out there, though they're
all named the same. I've got two
I did peek inside the E not long after I got it and I do remember that
the OXCO looks very different, it is much smaller than the one on my
Nortel unit. If it is the OXCO I can always source a potentially better
OXCO and then I can have more fun playing with it. Being a technician I
really
I just calculated the frequency offset. I count 5 crosses, while jumping
down to 200 ns, I guess, 1 cross equals 10 min? So let's say the jump
lasts 60 min (= T jump). When we want to calculate the frequency offset
out of a phase jump, we have to differentiate the phase and we should
achieve
I did get one bad one leak or pin hole aging so much that it would have run
out of tuning range in a month
Bert Kehren
In a message dated 2/27/2013 7:24:25 P.M. Eastern Standard Time,
jmi...@pop.net writes:
Sounds like a bad OCXO. The crystal frequency jumps slightly, and the
If your unit is exactly like that on ebay 251226027893, it has a 10 MHz
HP oscillator in a double oven, and it's absolutely sure that it's got a
6 channel receiver.
I should have read before, sorry.
I'm still not sure about your antenna, is it a Garmin? Well, it's most
likely an active
Hi
An E series Thunderbolt is about 4X the size of the later Thunderbolt,
sometimes called an E. Yes it's very confusing.
If the OCXO is about 1 on a side and the unit is maybe 1.5 wide, then you
have the later version of the Thunderbolt. Probably the best way to confirm
this and eliminate
Bob:
I am quite sure this is a Thunderbolt E as opposed to the E series of
the earlier Thunderbolt, the blue label on top of the aluminum box says
Thunderbolt E the blue Trimble box that it came in says Thunderbolt E
Starter Kit and yes as I said below the OCXO is smaller than the one on
my
On 02/27/2013 01:09 PM, Paul Berger wrote:
I am considering getting a counter with better resolution than my 5316A,
and have been looking at 5335A, they seem to be quite capable and fit my
budget, but I have some questions about options.
Have you considered the 5334A? It has the same spec
On 02/18/2013 10:32 PM, Herbert Poetzl wrote:
I'm new to the time-nuts community, so I simply start
with a short info on how I got into this situation :)
(skip forward toONTOPIC if not interested)
Not long ago, I decided to build a reasonably good
frequency counter for my personal use and
On 02/12/2013 08:19 PM, Mike S wrote:
On 2/10/2013 6:04 PM, Magnus Danielson wrote:
You should read TCP/IP as Internet Protocols (notice plural form
here). It points to the stack of protocols,
Actually, no. IP is Internet Protocol, singular, and is the L3 (mostly -
IP predates the ISO/OSI
On Wed, Feb 27, 2013 at 7:02 PM, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 02/12/2013 08:19 PM, Mike S wrote:
On 2/10/2013 6:04 PM, Magnus Danielson wrote:
You should read TCP/IP as Internet Protocols (notice plural form
No. The best way to pronouncethe slanted bar is over.
So
IP can be run on a lot of different platforms.
Check out Request for Comments: 1149
http://www.ietf.org/rfc/rfc1149.txt
Dave
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Chris Albertson
Sent: Wednesday, February 27, 2013
On Wed, Feb 27, 2013 at 9:54 PM, DaveH i...@blackmountainforge.com wrote:
IP can be run on a lot of different platforms.
Check out Request for Comments: 1149
Even better, check out the guys who actually implemented RFC1149.
This page has links.
http://www.blug.linux.no/rfc1149/
Chris
First try at a simple GPSDO for the RaspberryPi. See here:
http://www.c-c-i.com/exchange/for the file PiAutoTIC1.zip
Thanks to Bob Smither for his file exchange site.
This project is completely open-source, VHDL and C sources are available.
Can be implemented also with any uP but the C source
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