Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
tmiller11147@verizon.net said:
I am trying to find out how they triple the 5 MHz to get 15 MHz. Maybe it
can be changed to just double to 10 MHz. There are a few inductors on the
board and that may make for a filter.
The Fourier expansion of a square wave is odd harmonics. To get 15 from 5,
turn the 5 into a square wave, filter out everything but 15, and amplify
what's left.
I don't yet have a computer connected. Does the SatStat program run under
windows?
Yes.
--
These are my opinions. I hate spam.
My system arrived today in original unopened boxes. Hooked up 24 volts and
a gps antenna and it locked in about an hour and 10 MHZ output as compared
with thunderbolt GPS seems to be working just great. No trace movement on
scope using thunderbolt as trigger and looking at Lucent 10 MHZ output.
Strange output pulse! Looking forward to 10 MHZ sine wave output mod that
the gurus on the list will discover.
Wonder what these units cost new when they were built?
73,
Bill, WA2DVU
Cape May, NJ
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I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Bill Riches
Sent: Wednesday, October 29, 2014 4:10 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
My system arrived today in original unopened boxes. Hooked up 24 volts and a gps antenna and it locked in about an hour and 10 MHZ output as compared with thunderbolt GPS seems to be working just great. No trace movement on scope using thunderbolt as trigger and looking at Lucent 10 MHZ output.
Strange output pulse! Looking forward to 10 MHZ sine wave output mod that the gurus on the list will discover.
Wonder what these units cost new when they were built?
73,
Bill, WA2DVU
Cape May, NJ
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
The fault light will come on until both oscillators have locked. It takes a
long while, at least on mine.
I think it needs to establish the position before everything is stable.
----- Original Message -----
From: "Anthony Roby" aroby@antamy.com
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Thursday, October 30, 2014 3:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
Z3810A,Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the
Fault light is on and the No GPS and Standby lights flash. When I connect
my GPS antenna, the No GPS light stops flashing and stays on. After
several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable,
the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light
since there is no supplemental data to work from.
Anthony
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Bill
Riches
Sent: Wednesday, October 29, 2014 4:10 PM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Z3811A, Z3812A GPSDO system
My system arrived today in original unopened boxes. Hooked up 24 volts
and a gps antenna and it locked in about an hour and 10 MHZ output as
compared with thunderbolt GPS seems to be working just great. No trace
movement on scope using thunderbolt as trigger and looking at Lucent 10
MHZ output.
Strange output pulse! Looking forward to 10 MHZ sine wave output mod that
the gurus on the list will discover.
Wonder what these units cost new when they were built?
73,
Bill, WA2DVU
Cape May, NJ
time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
Hi
It looks like the power bricks are labeled 1.9A. This is at 18V. At 24V max current is probably 1.3A or so. It’s also labeled 25W. That is a good indication the 1.3 might be a little high. It’s a good bet that the -15V output has nearly zero load, so the “real” max should be below 1A at 24V per box or 2A for a pair of them. Once the OCXO cuts back, the + 15 should not be loaded very heavily. Yes, that’s very much what a TBolt power supply drain looks like.
Bob
On Oct 30, 2014, at 3:59 PM, Bob Stewart bob@evoria.net wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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I was finally able to get my units to lock and behave as described below. I am still unable to get any data into the PC, either via the RS422 to RS232 hack or through Götz Romahn's modification of the RS422 output. This issue must be to do with the voltage levels.
I did connect my scope up to the RS422/1PPS output and was able to capture the serial data coming out of that (see the screenshot at http://goo.gl/87e8GG). I could see two of the numbers incrementing every second, so that must be a timestamp. I have ordered a USB to RS422 cable, so hopefully that will resolve the issue of communicating via J8. Thanks Bob for letting me know that the active J8 is on the unit with the green ON light illuminated.
Anthony
-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces@febo.com] On Behalf Of Bob Stewart
Sent: Thursday, October 30, 2014 2:59 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob
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Hi Anthony,
When you ran Satstat, did you open the serial port? Click Commport->Settings and set it 9600,8,N,1. Then click Commport->Port open. Works OK under XP for me. I haven't tried it under Wine as I'm out of serial ports on the server and have the laptop to use.
Bob
From: Anthony Roby <aroby@antamy.com>
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 8:17 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I was finally able to get my units to lock and behave as described below. I am still unable to get any data into the PC, either via the RS422 to RS232 hack or through Götz Romahn's modification of the RS422 output. This issue must be to do with the voltage levels.
I did connect my scope up to the RS422/1PPS output and was able to capture the serial data coming out of that (see the screenshot at http://goo.gl/87e8GG). I could see two of the numbers incrementing every second, so that must be a timestamp. I have ordered a USB to RS422 cable, so hopefully that will resolve the issue of communicating via J8. Thanks Bob for letting me know that the active J8 is on the unit with the green ON light illuminated.
Anthony
I have both of my units sitting on the bench. I found that I needed to
connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey'
over! I didn't expect that. Are others seeing this. There must be a way
to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
I thought so too. There is an ultracap in each unit.
Tom
----- Original Message -----
From: "Mike Seguin" n1jez@burlingtontelecom.net
To: "Discussion of precise time and frequency measurement"
time-nuts@febo.com
Sent: Friday, October 31, 2014 12:19 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,
Z3811A, Z3812A GPSDO system
I have both of my units sitting on the bench. I found that I needed to
connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey'
over! I didn't expect that. Are others seeing this. There must be a way to
store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5
to J5? And can you remind me whether you are using the supplied
interface cable, or are you using something else? After warmup, the ON
light is on for the REF-0 unit and the STBY light is on for the REF-1
unit. While running, there is no output from J8 on the unit marked STBY.
J8 works on the unit marked ON. There is a timestamp coming from J6, and
I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the
Fault light is on and the No GPS and Standby lights flash. When I
connect my GPS antenna, the No GPS light stops flashing and stays on.
After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable,
the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light
since there is no supplemental data to work from.
Anthony
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--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
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Hi Mike,
I've noticed the same. In looking at the Satstat program, it appears that when you enter a location, that's only treated as a hint. There is also a value you can set to zero that supposedly tells it to come up with the last hold value. It didn't seem to work for me. I've finally got my location and power cords in more or less permanent locations, but things happen. And, I won't be getting a UPS for it for quite some time. Maybe someone else has the secret sauce.
Bob
From: Mike Seguin n1jez@burlingtontelecom.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, October 31, 2014 11:19 AM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I have both of my units sitting on the bench. I found that I needed to
connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey'
over! I didn't expect that. Are others seeing this. There must be a way
to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
time-nuts mailing list -- time-nuts@febo.com
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Hi Bob,
I connected 10 MHZ test jack output to a 15 db el-cheepo CATV amp and the output of that to a 4 way splitter. Splitter outputs went to 3336-3586 and counter. All seem to like the ref signal. Output of the amp takes makes the semi-square wave into a sick saw tooth. Amp is only rated from 50 to 500 mhz so strange things are happening with 10 MHZ input. Other CATV amps do have better low fx response - will play with that later.
I have 10 mhz pulse from Lucent into trigger input of 465 scope and Thunderbolt gps output into vertical input of scope. Time base is set for .01 Usec per div. I notice that trace moves right to left then left to right about every 5 min or so. Moves about 3 div before changing directions. Why? Is the Lucent still making a list? It has only been on for a few hours. It takes about 10 min for GPS to go out from a cold start. (My Thunderbolt and RB do not change direction when using one as trigger and the other for vert input to scope)
I ordered a USB to RS422 converter cable - will be here next week. What program is sort of working? Using Windoze 7 64bit and have an old XP machine available.
Sure do appreciate all the info from our time nuts gurus!
73,
Bill, WA2DVU
Cape May, NJ
This email is free from viruses and malware because avast! Antivirus protection is active.
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Hi
The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
Bob
On Oct 31, 2014, at 12:42 PM, Tom Miller tmiller11147@verizon.net wrote:
I thought so too. There is an ultracap in each unit.
Tom
----- Original Message ----- From: "Mike Seguin" n1jez@burlingtontelecom.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Friday, October 31, 2014 12:19 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I have both of my units sitting on the bench. I found that I needed to connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey' over! I didn't expect that. Are others seeing this. There must be a way to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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and follow the instructions there.
--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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Hi
I suspect that somebody will have to figure out what the 15 pin connector / jumper is doing. On previous RFTG units there was a way to re-wire the crossover interface to fake out the slave detect process. That would let you run a single GPS equipped box and have it behave correctly. Without the fake wires trick none of them played nice without the slave being present.
Yes that seems like it violates the spirit of redundancy. No I didn’t design it. Yes the guy who did spec it to work that way probably knew a whole lot more about exactly what they were after in the design.
I suppose the first task would be to figure out if the jumper cable is a straight through or not….
Bob
On Oct 31, 2014, at 12:19 PM, Mike Seguin n1jez@burlingtontelecom.net wrote:
I have both of my units sitting on the bench. I found that I needed to connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey' over! I didn't expect that. Are others seeing this. There must be a way to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
--
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
time-nuts mailing list -- time-nuts@febo.com
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Hi Bob:
When HP came out with the 300 series Rocky Mountain Basic computers they were fitted with a super cap to power the RTC.
I will keep time for some months.
http://www.prc68.com/I/HPIB.shtml#300
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
Bob
On Oct 31, 2014, at 12:42 PM, Tom Miller tmiller11147@verizon.net wrote:
I thought so too. There is an ultracap in each unit.
Tom
----- Original Message ----- From: "Mike Seguin" n1jez@burlingtontelecom.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Friday, October 31, 2014 12:19 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I have both of my units sitting on the bench. I found that I needed to connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey' over! I didn't expect that. Are others seeing this. There must be a way to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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73,
Mike, N1JEZ
"A closed mouth gathers no feet"
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Hi
I sort of doubt that a GPS aux supply is quite that low current. I have seen some RTC’s that won’t last a month on a coin cell. My recollection is that the Oncore backup is closer to that category than the “many years on a cap” group.
Bob
On Oct 31, 2014, at 9:26 PM, Brooke Clarke brooke@pacific.net wrote:
Hi Bob:
When HP came out with the 300 series Rocky Mountain Basic computers they were fitted with a super cap to power the RTC.
I will keep time for some months.
http://www.prc68.com/I/HPIB.shtml#300
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
Bob
On Oct 31, 2014, at 12:42 PM, Tom Miller tmiller11147@verizon.net wrote:
I thought so too. There is an ultracap in each unit.
Tom
----- Original Message ----- From: "Mike Seguin" n1jez@burlingtontelecom.net
To: "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Friday, October 31, 2014 12:19 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I have both of my units sitting on the bench. I found that I needed to connect them together to get the REF1 unit to come out of standby.
I am using GPSCon to monitor and it appears to work fine.
One thing on my units, when I power cycled them, it started a 'survey' over! I didn't expect that. Are others seeing this. There must be a way to store the surveyed position....
Tnx,
Mike
On 10/30/2014 3:59 PM, Bob Stewart wrote:
Hi Anthony,
Did you power cycle both units as part of connecting them together at J5 to J5? And can you remind me whether you are using the supplied interface cable, or are you using something else? After warmup, the ON light is on for the REF-0 unit and the STBY light is on for the REF-1 unit. While running, there is no output from J8 on the unit marked STBY. J8 works on the unit marked ON. There is a timestamp coming from J6, and I think a 1PPS signal on some pin or other.
Bob From: Anthony Roby aroby@antamy.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Thursday, October 30, 2014 2:24 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
I'm still having no luck with mine. When I power on, the LEDs cycle, the Fault light is on and the No GPS and Standby lights flash. When I connect my GPS antenna, the No GPS light stops flashing and stays on. After several minutes only the Standby light is on.
When I connect both the Ref1 and Ref0 together with the interface cable, the Fault lights on both units are illuminated.
Do you see the same? I don't know what to infer from the Fault light since there is no supplemental data to work from.
Anthony
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73,
Mike, N1JEZ
"A closed mouth gathers no feet"
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Task 1 complete.
Pin-1 -> Pin-15
Pin-2 -> Pin- 14
Pin-3 -> Pin- 13
...
...
Pin-14 -> Pin- 2
Pin-15 -> Pin-1
Shell -> Shell
Regards,
Tom
----- Original Message -----
From: "Bob Camp" kb8tq@n1k.org
To: n1jez@burlingtontelecom.net; "Discussion of precise time and frequency
measurement" time-nuts@febo.com
Sent: Friday, October 31, 2014 8:27 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A,
Z3810A,Z3811A, Z3812A GPSDO system
Hi
I suspect that somebody will have to figure out what the 15 pin connector
/ jumper is doing. On previous RFTG units there was a way to re-wire the
crossover interface to fake out the slave detect process. That would let
you run a single GPS equipped box and have it behave correctly. Without
the fake wires trick none of them played nice without the slave being
present.
Yes that seems like it violates the spirit of redundancy. No I didn’t
design it. Yes the guy who did spec it to work that way probably knew a
whole lot more about exactly what they were after in the design.
I suppose the first task would be to figure out if the jumper cable is a
straight through or not….
Bob
Hi Bob et al,
I don't understand the direction this question about the supercap has taken. It's connected to pin 1 of the GPS receiver. It looks to be a UT+, so that's the battery backup power. According to my UT+ manual the current draw on this pin is between 5uA (at 2.5V) and 100uA (at 5V)? How many hours will a .022F supercap keep at least 2.5V at that sort of discharge rate? Unless the cap has gone bad, it seems more likely that Bob's comment about it doing a fast survey and then doing a slower one in the background probably has merit. In fact, my unit goes through its survey mode pretty quickly on power up. So do those current/voltage figures imply several hours on the cap?
Bob
From: Bob Camp kb8tq@n1k.org
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, October 31, 2014 9:22 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
Hi
I sort of doubt that a GPS aux supply is quite that low current. I have seen some RTC’s that won’t last a month on a coin cell. My recollection is that the Oncore backup is closer to that category than the “many years on a cap” group.
Bob
On Oct 31, 2014, at 9:26 PM, Brooke Clarke brooke@pacific.net wrote:
Hi Bob:
When HP came out with the 300 series Rocky Mountain Basic computers they were fitted with a super cap to power the RTC.
I will keep time for some months.
http://www.prc68.com/I/HPIB.shtml#300
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
Bob
Hi
Well Q = CV. If delta V = 1 and C = 0.022 then Q = 0.022. That’s 22 ma for 1 second or 22 ua for 1,000 seconds. At 5 ua you would get to about an hour. If the delta V is 2X that, the times would all double. If the current is 10X lower than the spec (it might be …) then you could get out to around a day.
Bob
On Nov 1, 2014, at 12:38 AM, Bob Stewart bob@evoria.net wrote:
Hi Bob et al,
I don't understand the direction this question about the supercap has taken. It's connected to pin 1 of the GPS receiver. It looks to be a UT+, so that's the battery backup power. According to my UT+ manual the current draw on this pin is between 5uA (at 2.5V) and 100uA (at 5V)? How many hours will a .022F supercap keep at least 2.5V at that sort of discharge rate? Unless the cap has gone bad, it seems more likely that Bob's comment about it doing a fast survey and then doing a slower one in the background probably has merit. In fact, my unit goes through its survey mode pretty quickly on power up. So do those current/voltage figures imply several hours on the cap?
Bob
From: Bob Camp kb8tq@n1k.org
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, October 31, 2014 9:22 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812A GPSDO system
Hi
I sort of doubt that a GPS aux supply is quite that low current. I have seen some RTC’s that won’t last a month on a coin cell. My recollection is that the Oncore backup is closer to that category than the “many years on a cap” group.
Bob
On Oct 31, 2014, at 9:26 PM, Brooke Clarke brooke@pacific.net wrote:
Hi Bob:
When HP came out with the 300 series Rocky Mountain Basic computers they were fitted with a super cap to power the RTC.
I will keep time for some months.
http://www.prc68.com/I/HPIB.shtml#300
Mail_Attachment --
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Bob Camp wrote:
Hi
The ultra cap is a pretty small one (physical small). You might be able to find a larger (more farads) one that would fit in the same space. It’s not going to help for a hours and hours sort of outage. It might get you from dying in 15 minutes to dying in a half hour.
Bob
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Hi
Quick question - What about the other pins? Do they hook up in the same manner? If so, what happens to the odd pin?
Bob
On Oct 31, 2014, at 10:41 PM, Tom Miller tmiller11147@verizon.net wrote:
Task 1 complete.
Pin-1 -> Pin-15
Pin-2 -> Pin- 14
Pin-3 -> Pin- 13
...
...
Pin-14 -> Pin- 2
Pin-15 -> Pin-1
Shell -> Shell
Regards,
Tom
----- Original Message ----- From: "Bob Camp" kb8tq@n1k.org
To: n1jez@burlingtontelecom.net; "Discussion of precise time and frequency measurement" time-nuts@febo.com
Sent: Friday, October 31, 2014 8:27 PM
Subject: Re: [time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A,Z3811A, Z3812A GPSDO system
Hi
I suspect that somebody will have to figure out what the 15 pin connector / jumper is doing. On previous RFTG units there was a way to re-wire the crossover interface to fake out the slave detect process. That would let you run a single GPS equipped box and have it behave correctly. Without the fake wires trick none of them played nice without the slave being present.
Yes that seems like it violates the spirit of redundancy. No I didn’t design it. Yes the guy who did spec it to work that way probably knew a whole lot more about exactly what they were after in the design.
I suppose the first task would be to figure out if the jumper cable is a straight through or not….
Bob
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