Bob wrote:
I've heard much talk in this group about the power supplies on the Z3805.
* * * my Z3805 * * * started producing a real bad smell after a
few hours, the classic burnt transformer type. * * * I opened the
unit and found the 25W 5V, +/-15V (made by AT&T) was real, r
Chris wrote:
According to the documentation I have, pins 2, 4, and 5 are all tied
together internally
I think you may be correct. My recollection was that it needed to be
done at the connector, but I may be mis-remembering. Worth a check, though.
If you have Pin 6 ranging from + 5 V to -
> Tried you suggested test, and re-acquisition was fast - yes, it has battery
> backup; a feature I now consider essential!
Has anybody done any studies on acquisition time vs time since solid contact?
--
These are my opinions. I hate spam.
___
-Original Message-
From: Hal Murray
[]
There is another variable to consider: cold start vs warm start. If it
doesn't know the time or doesn't have a recent copy of the satellite orbit
info, it has to search a lot harder to get locked up.
When you get a chance, disconnect it for an hour
There seems to be a nascent market for small GPS receivers in the "DIY
drone" hobbyist sector. I stuffed one of the modules from
http://store.diydrones.com/category_s/10.htm (more info at
http://store.diydrones.com/3DR_GPS_LEA_6_p/br-3drlea-6.htm ) into a small
plastic project box and added a USB
Henry
Its been a while since that thread and I have not done anything with the
chip. But to answer your questions.
Really good signal to noise. The modulator is 6" from the saa6579. Its a
home brew BPSK modulator and the transitions are programmable. But I am
following wwvbs 1sec per bit. So the ph
SparkFun?
https://www.sparkfun.com/pages/GPS_Guide
Great people to deal with -- they have a lot of information online for each
module.
Dave
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of gonzo .
> Sent: Thursday, November 1
jim...@earthlink.net said:
> Big enough that Synergy & Garmin have pricing for anywhere from 1 to 1000
> units
I don't know of any GPS units with PPS that are both low cost and no
soldering.
There are several low cost units that come in a nice small package. But you
can't just plug them int
The Sureelectronics board may be worth a look.
RS232, USB and a claimed Time Accuracy of a rather optimistic 20nS.
ian
http://www.sureelectronics.net/goods.php?id=98
http://www.sureelectronics.net/goods.php?id=99
> Date: Thu, 15 Nov 2012 14:59:09 -0800
> From: Hal Murray
> To: Discussion of
Hi
….. but not at the same sort of price as a consumer grade GPS.
Bob
On Nov 15, 2012, at 7:27 PM, Jim Lux wrote:
> On 11/15/12 4:10 PM, Bob Camp wrote:
>> Hi
>>
>> Not much of a market for that sort of stuff.
>>
>> Bob
>>
>
> Big enough that Synergy & Garmin have pricing for anywhere from
On 11/15/12 4:10 PM, Bob Camp wrote:
Hi
Not much of a market for that sort of stuff.
Bob
Big enough that Synergy & Garmin have pricing for anywhere from 1 to
1000 units
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paul swed schrieb:
To the saa6579
As mentioned in the other thread.
Simple to hook up.
Cheap
Requires 1000uv or more so that ends up making things more complicated.
S/N is important, not so absolute amplitude.
But in my case simply did not really work at 57 or 60 Khz.
The chip looks for co
Hi
I think I'd try grounding pins 4 and 5….
Bob
On Nov 15, 2012, at 11:15 PM, Chris Howard wrote:
> On 11/15/2012 3:49 PM, Charles P. Steinmetz wrote:
> .90 VDC 9,999,999.90
>>
>> How and where are you measuring the EFC voltage? Are you sure the
> voltage on the EFC pin of the 1081
Hi
Not much of a market for that sort of stuff.
Bob
On Nov 15, 2012, at 5:59 PM, Hal Murray wrote:
>
> gha...@gmail.com said:
>> Me too, please. Something with a PPS, and an RS-232 output, withour
>> soldering.
>
> I don't know of any low cost no-soldering solutions.
>
>
> --
> These a
On Thu, 15 Nov 2012 15:06:10 -, "David J Taylor"
wrote:
>-Original Message-
>From: David
>[]
>So the 16x manual says. As far as I know, all of the Garmin LVC, HVC,
>and 5Hz versions of their receivers have a timing pulse output.
>
>The GPS18 series that I have was replaced by the GP
gha...@gmail.com said:
> Me too, please. Something with a PPS, and an RS-232 output, withour
> soldering.
I don't know of any low cost no-soldering solutions.
--
These are my opinions. I hate spam.
___
time-nuts mailing list -- time-nuts@febo.
On 11/15/2012 3:49 PM, Charles P. Steinmetz wrote:
.90 VDC 9,999,999.90
>
> How and where are you measuring the EFC voltage? Are you sure the
voltage on the EFC pin of the 10811 (Pin 6) was the same as you measured?
Was the EFC return pin (Pin 5) connected to the oscillator supply retur
Chris wrote:
If I read this correctly, I'm looking at
9,999,999.97 Hz ?
Correct -- the small digit to the right is the exponent. As others
have mentioned, by holding the UP arrow key in for about 3 seconds,
the 1992 will switch to a 10-second gate and give you one more digit
of resolution
Chris:
This says your EFC circuit is not working, and you are only
getting 0.05 Hz frequency change across the -5 to +5 EFC range.
The spec on the HP10811 is 1.0 Hz minimum.
And, yes, in a counter the EFC circuit is not used, so no one would
know if it failed.
It is very simple circuit. The o
On Thu, Nov 15, 2012 at 9:02 PM, Jim Lux wrote:
>
>
> ALl good ideas.. but I was looking more for something a bit more
> packaged.. like a hockey puck with wires coming out.
>
>
Me too, please. Something with a PPS, and an RS-232 output, withour
soldering.
--
Sanjeev Gupta
+65 98551208 htt
Hi
On a normal 10811, you should see at least +/- 1 Hz change. It should go
from 10,000,001.xx to 9,999,999.xx. That of course assumes the counter
reference is right on frequency. Since it may not be, it's the 2 Hz delta
between +5V and -5V you need to spot first.
Right now you data shows < 0.1 H
Hold the Up arrow down for >3 sec and put your counter into the 10 sec
range.
That will give you another digit of resolution. Now the LS Digit will be
1e-10 / count enough to test short term delta stability of many things.
ws
- Original Message -
From: "Chris Howard"
To: "WarrenS"
You all were right, my targeting of the 50 ohm resistor
across the oscillator output does not seem to have solved the
problem. A good thing to do, probably, but not the answer.
While I was all excited about the resistor change I also
mapped out the control voltage (EFC) vs frequency change.
I w
Interesting another cloudy service.
Thanks
On Thu, Nov 15, 2012 at 3:15 PM, M. Simon wrote:
> You can park large files at:
>
> http://www.mediafire.com/
>
>
>
> Engineering is the art of making what you want from what you can get at a
> profit.
>
>
>
> >
> > From:
You can park large files at:
http://www.mediafire.com/
Engineering is the art of making what you want from what you can get at a
profit.
>
> From: "time-nuts-requ...@febo.com"
>To: time-nuts@febo.com
>Sent: Thursday, November 15, 2012 3:02 AM
>Subject: tim
I have to say I have my supply also. Though many of them will need the
special heat treatment to clear the bulb. But heck at $25 I picked up 6 X
cel site RBs. You can play around with them.
Regards
Paul
WB8TSL
On Thu, Nov 15, 2012 at 2:27 PM, Pete Lancashire wrote:
> I'm also using Bob's method o
I'm also using Bob's method of resolving the issue of "Life Time"
-pete
On Thu, Nov 15, 2012 at 7:09 AM, Bob Smither wrote:
> On 11/14/2012 10:56 AM, Bob Smither wrote:
>> Do Rb oscillators wear out? I have found:
>
>
>
> Thanks for all the good information! I am running my FE-5680a 24/7, and
david-tay...@blueyonder.co.uk said:
> Well, after 5 hours the Adafruit unit finally locked - must have been just
> the right combination of satellites! I was slightly surprised by the
> difference in antenna size. It would have to be placed near a window for
> normal use. ..
There is anoth
jim...@earthlink.net said:
> ALl good ideas.. but I was looking more for something a bit more packaged..
> like a hockey puck with wires coming out.
Garmin GPS-18x.
The GPS-18x is the newer version. The GPS-18 (no x) is no longer in
production.
There are several versions. Check the fine pr
From: james machado
[]
all good points David. I originally had place mine close to a window
to get a lock as it could not acquire any satellites in my home office
otherwise. I don't have a south facing window and my office is on the
first floor of a two story house. That may or may not have pla
On Thu, Nov 15, 2012 at 4:30 AM, David J Taylor
wrote:
> i just used this to with a raspberry pi with good success.
>
> https://www.adafruit.com/products/746
>
> james
> ===
>
> It looks idea, James, but ... with the 15 mm square patch antenna it seems
>
Bob,
Rubidium lamps are purpose designed for particular units.
However The Efratom threaded ones are mostly interchangeable.
I'll see about taking a PIX of a variety of lamps and posting it.
Something along the lines of the Rubidium Cell PIX I took at:
http://www.leapsecond.com/pages/rb-cells/
Hi
The newer LPRO's should have modern lamps in them. Who knows what the older
(1990's) parts have in them.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Smither
Sent: Thursday, November 15, 2012 10:09 AM
To: time-nuts@febo.c
On 11/14/2012 10:56 AM, Bob Smither wrote:
> Do Rb oscillators wear out? I have found:
Thanks for all the good information! I am running my FE-5680a 24/7, and, as
suggested, have a couple of backups. At my age I should be set for life!
One last question: what category of lamps do the Efratom
-Original Message-
From: David
[]
So the 16x manual says. As far as I know, all of the Garmin LVC, HVC,
and 5Hz versions of their receivers have a timing pulse output.
The GPS18 series that I have was replaced by the GPS18x series.
Some of their receivers have "TIA-232-F (RS-232) Compa
On Thu, 15 Nov 2012 06:07:28 -0800, Jim Lux
wrote:
>On 11/15/12 5:33 AM, David wrote:
>> On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux
>> wrote:
>>
>>> On 11/15/12 4:30 AM, David J Taylor wrote:
i just used this to with a raspberry pi with good success.
https://www.adafruit.com/prod
On 11/15/12 5:33 AM, David wrote:
On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux
wrote:
On 11/15/12 4:30 AM, David J Taylor wrote:
i just used this to with a raspberry pi with good success.
https://www.adafruit.com/products/746
james
===
It looks id
On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux
wrote:
>On 11/15/12 4:30 AM, David J Taylor wrote:
>> i just used this to with a raspberry pi with good success.
>>
>> https://www.adafruit.com/products/746
>>
>> james
>> ===
>>
>> It looks idea, James, but .
On 11/15/12 4:30 AM, David J Taylor wrote:
i just used this to with a raspberry pi with good success.
https://www.adafruit.com/products/746
james
===
It looks idea, James, but ... with the 15 mm square patch antenna it
seems deaf compared to similar
i just used this to with a raspberry pi with good success.
https://www.adafruit.com/products/746
james
===
It looks idea, James, but ... with the 15 mm square patch antenna it seems
deaf compared to similar devices with 25 mm antennas. Perhaps
unde
Hi
Since many "interesting sources" are at 5 or 10 MHz, the magic of the 5313x in
frequency mode goes away. They don't get much processing gain when the source
and reference have edges at the same place. Stick with time measurements for
ADEV.
Bob
On Nov 14, 2012, at 9:59 PM, Adrian wrote:
I enjoy beeing here, thank you all for your responses.
73 Volker
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