Yes, no TRAIM on the uBlox but I haven't seen the TRAIM alarm kicking in on
the Motorola/iLotus M12M so I think that for our experiments the uBlox is
fine. Even better, have the two: the Motorola/iLotus and the uBlox.
On Tue, Jan 3, 2012 at 2:37 AM, k4...@aol.com k4...@aol.com wrote:
The
Hal wrote:
Does anybody know anything about the temperature coefficients of large caps?
I'm not interested in the frequency shift of the filter as the temperature
but the voltage shift due to a fixed charge as the capacitance changes.
The common rule of thumb is thousands of ppm per
degree
Hope you all had a great entering in 2012.
Googling around I could not find any tech info on any of the
transiac or DSP technology modules
(I could find only many surplus sales...)
these are late eighties camac modules... I have no clue
if the companies exist or changed names or extinct etc.
I got mine for around $25 in a regular bidding affair. Mine had trouble
locking, It only locked a handful of times, and that took forever, but most
of the time it just sat there and cooked. The seller replaced it and the
new locks up in 2 or 3 minutes. I did not have to ship the old one
Hi
Using electrolytic caps in timing applications is a bit exciting. Their
leakage current changes each time you change the voltage on them. It's
enough of a change to significantly impact long time constants. In some
cases the capacitance changes with voltage as well.
Temperature stability of
Hi
I believe that more than just TRAIM goes away when you get the not a T
version of the uBlox receivers. You probably should check the jitter on the
1 pps output ...
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Azelio Boriani
Hi
More or less:
1) Customer request comes in
2) Custom part number is assigned
3) Prototype ships
4) Customer is tied to custom number
This accomplishes a couple of things. It eliminates transcription orders (or
at least makes them more obvious). It also can lock out competition and
reverse
On Tue, Jan 3, 2012 at 9:14 AM, Bob Camp li...@rtty.us wrote:
Hi
Using electrolytic caps in timing applications is a bit exciting. Their
leakage current changes each time you change the voltage on them. It's
enough of a change to significantly impact long time constants. In some
cases the
Hi
No argument there, but this thread has wandered a bit.
If you are depending on the capacitor to provide a specific time constant,
then you will have issues. If the control loop is not impacted by the
changes, then they will track out. Often it's not quite an either / or, but
a some of this
If you don't want the bad one I would be interested so I could
disassemble and diagram it out.
I don't want to do that to a good one.
On 01/03/12, Robert Benwardrbenw...@verizon.net wrote:
I got mine for around $25 in a regular bidding affair. Mine had trouble
locking, It only
Oh no, I was speaking always of timing version GPSes. For non timing
version GPSes you loose the position-hold timing mode too. uBlox has T-RAIM
in the LEA6-T version. In the block diagram of uBlox GPSes they show the
option XTAL/TCXO for their receivers. Although not stated, I believe that
the
On 1/3/2012 8:20 AM, Robert Benward wrote:
I got mine for around $25 in a regular bidding affair. Mine had trouble
locking, It only locked a handful of times, and that took forever, but most
of the time it just sat there and cooked. The seller replaced it and the
new locks up in 2 or 3 minutes.
this thread has wandered a bit.
The thread was originally for Simple...
Bottom line is that electrolytic caps can be made to work fine for a
SIMPLE analog controller built for home NUT use,
Not recommended for space or critical life support applications, or any
production thing.
Besides
In message 80B26DC756AA45DD84E4EB9E14B58998@Warcon28Gz, WarrenS writes:
The leakage current noise I measured was way below insignificant when things
are properly scaled.
Really stupid question: Couldn't the double condensor from voltage
references trick be used to eliminate the leakage
Yes, and the new uBlox timing GPS have a software jamming sensor and
indicator which the Motorola/iLotus products do not have, and they are much
easier to get to work at a users' site than the Motorola parts, and much more
robust against jamming than the Motorola timing GPS. We have done
On Tue, 03 Jan 2012 07:01:13 +0100, ehydra ehy...@arcor.de wrote:
David schrieb:
I could analyze it on SPICE but I suspect the real world construction
parasitics will be what limits the performance. I just sketched it
out in my notebook but I will see if I can post it somewhere. Is
there a
Peter,
Sure, If I can have a copy of what you produce. Send me your address. I
assume you are in the US?
If you look on Ebay, this is one of those that was mounted on a PCB with an
aux 68MHz osc and DB9 connector.
Bob
- Original Message -
From: Peter Gottlieb n...@verizon.net
In a message dated 02/01/2012 23:53:41 GMT Standard Time,
azelio.bori...@screen.it writes:
Yes, seems difficult to find the differences but I've found at least the
131-2: http://w9fz.com/ham/OCXO131-2Spec.pdf
--
Some more here.
Yes, found others but, for example, we use the 131-40 and have the
datasheet: can't find it from those URLs. You can find 131-42 131-45 and
131-1000, 1001, 1002 and so on. Our 131-40 was not made for us but decided
to use it with the permission of the original customer to increase the
order
Previously I have been comparing 10 MHz frequencies using TvB's picPET
device plus a picDIV divider to get a 1 PPS signal, but I wanted more
resolution for comparing relative drift of two Rb references. I got square
wave outputs from my references (see my previous posts) and I made a simple
My E-bay FE-5680A finally arrived. (4weeks later)
Of the pins on the DB-9 connector, which one is the RF output?
The manual only talks about an SMA output.
I know this has been talked about before, but I cannot find the thread.
Thanks in advance sorry for bandwidth,
-Brian, WA1ZMS
There is some nonlinearity but it seems consistent from cycle to cycle. I
might be able to reduce the bumps with better circuit layout, shorter
wires, terminated lines etc. But just for playing around with my initial
data, I think I can model the shape of the response and get a more accurate
Having access to two Rb sources and looking at phase shift and jitter is
something I find interesting. Has anyone fed two Rb sourced 10mhz signals
in to a high-z an op-amp and looked at the output on a SA ? Should probably
have at least 100mhz bw on the SA in order to see the events. A few tests
In the past I've mentioned the Navsync CW-12 GPS board. Oncore M12
drop-in replacement, 1 PPS ( measured Standard Deviation 5 ns., range
~ 30 ns. from min to max for 1000 measurements), and a 10 MHz output
that's 'steered by the GPS receiver'.
The recent discussions about a cheap, simple
On 12/31/2011 07:41 PM, lstosk...@cox.net wrote:
UBLOX TIM-CJ module TIM-ST GPS engine Jupiter footprint
After finding these, and buying a couple, I found item 220915477952
U-Blox RCB-LJ receiver boards, cheaper ($9) and (I think) newer.
If I have the spec sheets figured out, the TIM-CJ
Hi John,
I did you what you suggested and it locks now. I tweaked so that the output
is only 10-20Hz above 10MHz. It seems to lock on the way down from the peak
(high) frequency, it doesn't seem to lock on the way up. It seems to agree
with one of your plots, but no the other. You don't
Wait...they said it is good enough for government work?
This is an interesting discovery, but I wonder if this is intentional
for some not so obvious reason.
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