New NTBW50AA
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
Mine insists on determining a negative altitude. sometimes it's called
a good position, sometimes not. Eventually, it becomes 'good" even with
-altitude!
Now I understand why it goes in and out of holdover, but what about the
bad altitude??
Jim
wb4gcs@amsat.org
On 9/20/2013 6:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
time-nuts mailing list -- time-nuts@febo.com
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and follow the instructions there.
Hi
GPS uses a model of the earth. It calculates position relative to this model. The model does not correspond to sea level. It's very common to be driving along the beach and see negative altitude numbers with an honest GPS. If you are located within 100' of sea level, you may see negative altitude from a GPS. In other areas you may of course see significant positive altitudes when sitting on the beach.
Bob
On Sep 20, 2013, at 7:23 PM, Jim Sanford wb4gcs@wb4gcs.org wrote:
Mine insists on determining a negative altitude. sometimes it's called a good position, sometimes not. Eventually, it becomes 'good" even with -altitude!
Now I understand why it goes in and out of holdover, but what about the bad altitude??
Jim
wb4gcs@amsat.org
On 9/20/2013 6:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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and follow the instructions there.
Hi:
My Nortel unit seems to go into holdover when LH is still reporting one
usable satellite. When doing a survey it would go into holdover below
four because I believe it is doing 3D position samples which would
require four.
On a related note I picked up some 110 pin Z-Pack connectors, that would
fit these units, cheap and I have four extras I don't have any use for
and will offer then here free, one per customer, to the first four
people who send me a private email. If postage is expensive to where
you are from eastern Canada I may ask you to pay for the postage.
Paul.
On 9/20/13 7:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
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.
Hi
If you have one good sat, it should stay out of holdover.
Bob
On Sep 20, 2013, at 9:01 PM, Paul Berger phb.hfx@gmail.com wrote:
Hi:
My Nortel unit seems to go into holdover when LH is still reporting one usable satellite. When doing a survey it would go into holdover below four because I believe it is doing 3D position samples which would require four.
On a related note I picked up some 110 pin Z-Pack connectors, that would fit these units, cheap and I have four extras I don't have any use for and will offer then here free, one per customer, to the first four people who send me a private email. If postage is expensive to where you are from eastern Canada I may ask you to pay for the postage.
Paul.
On 9/20/13 7:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
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.
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and follow the instructions there.
I'm thinking I was dreaming because it's still at 468, like before. It is probably from when I was moving the antenna around and didn't turn the unit off and of course I didn't write it down.
Still wondering if holdover can be reset without turning it off.
Happy equinox.
Dave
I'm 1250' ABOVE sea Level.
LH currently reports an altitude of -2500'. What's up with this??
Jim
On 9/20/2013 7:29 PM, Bob Camp wrote:
Hi
GPS uses a model of the earth. It calculates position relative to this model. The model does not correspond to sea level. It's very common to be driving along the beach and see negative altitude numbers with an honest GPS. If you are located within 100' of sea level, you may see negative altitude from a GPS. In other areas you may of course see significant positive altitudes when sitting on the beach.
Bob
On Sep 20, 2013, at 7:23 PM, Jim Sanford wb4gcs@wb4gcs.org wrote:
Mine insists on determining a negative altitude. sometimes it's called a good position, sometimes not. Eventually, it becomes 'good" even with -altitude!
Now I understand why it goes in and out of holdover, but what about the bad altitude??
Jim
wb4gcs@amsat.org
On 9/20/2013 6:22 PM, Bob Camp wrote:
Hi
If the unit is dropping into holdover, something is wrong with the number of sat's it's seeing. If you have saved a location properly, it will only go into holdover when it's got zero sats. If it does not believe it's got a proper location it will drop into holdover when it goes below 4 sats. The number of sats visible isn't what counts here, it's the number that are locked up, above the elevation mask, and above the AMU threshold. Set either the elevation or the AMU to high and you will go in and out of holdover.
Bob
On Sep 20, 2013, at 2:13 PM, quartz55 quartz55@hughes.net wrote:
I was thinking of keeping a couple of batterys floated across the supply, since it will run on 24V. I'll have to figure out what I'll need for maybe 2 hours. Not sure what it's drawing now at 30V, but wouldn't be hard to measure.
Couple more things.
What is the foliage filter and will it work on the Nortel?
I keep seeing my holdover going up but haven't seen any sat drop out or yellow light on the front. Is there any way to re-set the holdover without turning the unit off? It's up to 468 now, not sure where it started the other day but probably in the 200's. I may be dreaming too.
I've dropped the idea about choke ring or ground planes after reading what I could about it. I may try building my own turnstile antenna (ala K7KKQ) and amp just for fun. Amps are cheap from Mouser and have less than 2 dB NF unlike mine which is 4 dB. Has someone made a DIY helix? I liked the pinwheel antenna but it may be hard to make.
Dave
----- Original Message -----
From: Charles Steinmetz
To: Discussion of precise time and frequency measurement
Sent: Friday, September 20, 2013 1:01 PM
Subject: Re: [time-nuts] New NTBW50AA
Dave wrote:
We have plenty outages here, so I may look into a UPS of some sort
but I have a rather large generator that I always turn on after
about 1/2 hour or so.
The UPS is to keep master oscillators (and for some of us, ovenized
voltage standards) running uninterrupted from the time of the failure
until the generator is running. Best practice is to use a "double
conversion" UPS to avoid even a short outage as it kicks in.
Best regards,
Charles
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.
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To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
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LH has provisions for various reset levels; I don't know if they apply to
the Nortel. Try 'r', and see where that leads.
JimT
Sent from my galaxy (Nexus).
On Sep 20, 2013 9:03 PM, "quartz55" quartz55@hughes.net wrote:
I'm thinking I was dreaming because it's still at 468, like before. It is
probably from when I was moving the antenna around and didn't turn the unit
off and of course I didn't write it down.
Still wondering if holdover can be reset without turning it off.
Happy equinox.
Dave
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and follow the instructions there.
On 09/20/2013 04:34 AM, quartz55 wrote:
But when working with clocks (time, frequency, stability measurements) this assumption often not true and it's helpful to think of averaging more as a disease than a cure.
/tvb
I can understand that.
Dave
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Rather, averaging is a good tool when applied right. In the field of
time and frequency, it can be tricker to apply it right, as it does not
always do what you expect it to do.
When we collect our stability measures for instance, we average only
after we have done pre-processing tailored to handling the obscure
noises we have that would otherwise make our averaging blow-up in our faces.
So, like any tool, it needs to be applied with proper knowledge.
Cheers,
Magnus