In normal float battery service, the voltage is about 56 volts. During a
equalize charge, it will be close to 60 volts. The unit you have most likely
spent all its life at 56 volts. The 48 volt service comes from the nominal
end of capacity voltage of a 48 volt (24 cells) at 2.0 volts (or less)
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As I mentioned earlier, the RS-232 interface board that I built is for a
non-NTP/non-Time-Nuts project. But, if I can make it useful in those
applications, great. I am not going to add any parts to the board for them.
That said, the MAX3232 chip has an extra RS-232 receiver on it. I can
No worries, Dave,
these Nortel/Trimble things are good bang for the dollars.
My first one is sitting in the e-13's for PPS and OSC already - it's only been
on 36 hours.
I did replace the OXCO with a MV89A as the original osc was faulty, but, then
again it only cost me $21.00 :)
That's not quit
From: Bob Bownes
100ms is an awful lot of 'inverter gates'!
===
You mis-understand - the inverter is simply to alter the negative-going
logic to positive-going, not to delay!
I had the same issue with my Sure Electronics board:
http://www.satsignal.eu/ntp/Sure-GPS.ht
I bought a Datum Symmetricom TS2100 on e-bay. I've updated the firmware
to 4.1. It did not have a gps module. After looking on time-nuts it
appears that it wants a Trimble module.
It will talk to a Resolution-T I had on hand. I can retrieve the
firmware version, signal strengths, and satellite
100ms is an awful lot of 'inverter gates'!
On Sep 7, 2013, at 23:15, Chris Albertson wrote:
> With RS232 the data uses negative logic (low is "1") and the control
> lines use positive logic (high is "1".) That is, a control line is
> "asserted" when it is at logic 0, a positive voltage.
>
>
With RS232 the data uses negative logic (low is "1") and the control
lines use positive logic (high is "1".) That is, a control line is
"asserted" when it is at logic 0, a positive voltage.
Some one at one time must have thought this made sense.
The good news is that a mistake is easy to detect
hol...@hotmail.com said:
> The 1PPS signal is normally low and pulses high for 100 milliseconds. The
> RS-232 adapter board that I built feeds this into an RS-232 transmitter chip
> (MAX3232), so on the interface connector CD will be at +V and pulse down to
> -V. Is this what stock NTP likes?
I got in those Adafruit GPS boards. They are a very nice little GPS. VERY
sensitive. I could get good lock indoors on my (windowless) kitchen floor.
The house is 2 story, stucco with wire mesh in the stucco. I could also get
lock in a restaurant that had a tin roof. We were far from any
Hi
A reasonable ADEV for tau =1 is in the sub 2.0 x10^-9 range (or 2,000e-009).
Bob
On Sep 7, 2013, at 7:27 PM, "quartz55" wrote:
> Thanks Mark, yeah, I think I'm getting the hang of this thing. The ADEV is
> down to 1.032e-008 by this point.
>
> I think the red light was on because it was
Hi
The NTBW50AA's (and their cousins) have a double oven in them. It's roughly 10
to 20X more stable (frequency vs temperature) than the OCXO in a 3801 or a
TBolt. The GPS it's self appears to be very similar to the TBolt GPS, so it's
a step up over a 3801. The firmware seems to work ok, but s
Thanks Mark, yeah, I think I'm getting the hang of this thing. The ADEV is
down to 1.032e-008 by this point.
I think the red light was on because it was going out of lock, it couldn't find
the satellites until I did a survey. Then things started coming into
perspective when it found my positi
Hi - Can you experts out there provide some general information on the NTBW50AA?
Performance wise - how does I compare to the Z3805 or others?
Thanks, John, K1AE, Bolton, MA
John Allen - PC Support Solutions www.pcsupportsolutions.com
PC On Site Service and Training - Computer HW/SW/Network deb
Your screenshot is looking good, it is 30% through a 2000 sample survey.
I don't know why you have a red LED.
A red LED is generally hardware failure on the Trimble Nortel units AFAIK.
Hit space bar in LH to get command help.
Once you are used to LH it's a very powerful tool.
e then e again write
I found the Menu "M". Now to figure out what all these things mean. Do I want
to write this to the eeprom not that it's settled down? 'E'
Dave
N3DT
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Ok, here's my latest screenshot, it seems to have located my position and has
stayed locked green for quite a while now and there seem to be more green
satellites.
http://s251.photobucket.com/user/DogTi/media/time/17399-7_zpsfdb856e8.jpg.html?sort=3&o=0
How do I save my position, I'm going to le
Where is the list of commands I can execute in LH? And where is an explanation
of the verbiage in LH?
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Well, I'm still trying to figure out this LH program, I didn't know there were
commands in it. I guess that's what all those / things are? Second time I
powered it up, it didn't turn red, but did go into blinking green. As far as I
can read the LH, it looks like the satellites are listed on t
a) Hit s then s again in LH. (survey)
b) something else caused red light (bad osc?)
Adjust unit to correct UTC and co-ords may speed up.
Where is the screen shot?
--marki
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Bob Camp
Sent
Hi
Google turns up:
http://www.datasheetarchive.com/CO-251-datasheet.html
Which shows the pinout and power connections.
Bob
On Sep 7, 2013, at 1:39 PM, corc...@yahoo.ca wrote:
> Hi,
>
> I have a Vectron Model 251-1253A would like to obtain the pin-out Like b+ and
> 10 Mhz Output , Specifa
Hi
If it's trying to get a position *and* it goes below 4 sats due to antenna
location, it will go to the red light mode. Once it's got a position it will
hold in there with one sat. The modern nav GPS's are much more sensitive than
the older GPSDO's, so you will need a better antenna location
Hi,
I have a Vectron Model 251-1253A would like to obtain the pin-out Like b+ and
10 Mhz Output , Specifation Sheet would be great or any information Available
Thark You,
Sal C. Cornacchia
Electronic RF Engineer (RET)
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OK, I got the thing started up, the com port seems to work with LH. Of course
it says bad position. I've got a screen shot of the startup, after about 15
minutes the green LED went on, indicating lock, but after about a half hour, it
went out and the red light went on indicating a fault accord
Hi,
I have a Vectron Model 251-1253A would like to obtain the pin-out Like b+ and
10 Mhz Output , Specifation Sheet wou be great or any information Available
Thark You,
Sal C. Cornacchia
Electronic RF Engineer (RET)
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Hi
I would suggest both the 5334 and the 5335. They aren't cheap from dealers, but
from individuals you should be able to get them for the same $100 to $150 price
as the 5316. I don't know if the shipping would be higher or not. Once you get
things packed into a "long distance box" the weight d
Hi
On Sep 7, 2013, at 10:13 AM, quartz55 wrote:
> OK, I'm staying away from the AC input, I can deal with the DC just fine.
> I've got some decent TV coax, and it shouldn't be a 30' run to a good spot.
Conventional TV coax (solid core rather than foam) is not ideal for GPS. The
foam core sat
Just in case someone ends up in the same boat with the EFC control voltage not
reaching the EFC pin on the OCXO.
Due to the plated through hole being accidently but inadvertently removed, for
example
You can pick off the EFC control voltage from TP23 next to the great big 4u7 NP
SM cap on the
On 9/6/13 8:36 PM, John C. Westmoreland, P.E. wrote:
Fellow Time Nuts:
Is this a site to be trusted?:
http://adn.agi.com/SatelliteOutageCalendar/SOFCalendar.aspx
Regards,
John W.
AGI are the folks who make and sell STK (Satellite Took Kit, I believe)
which has a dominant position in the ma
OK, I'm staying away from the AC input, I can deal with the DC just fine. I've
got some decent TV coax, and it shouldn't be a 30' run to a good spot. I have
a very good view of the southern sky, actually that's about all I have. Heavy
canopy of trees right above the shack area. Will trees blo
Hi
I'd say that:
HiNOTICE ADVISORY TO NAVSTAR USERS (NANU) 2013053
SUBJ: SVN34 (PRN04) FORECAST OUTAGE SUMMARY JDAY 246/1717 - JDAY 247/0029
1. NANU TYPE: FCSTSUMM
NANU NUMBER: 2013053
NANU DTG: 040030Z SEP 2013
REFERENCE NANU: 2013052
REF NANU DTG: 291526Z AUG 201
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