Re: [time-nuts] Lady Heather numbers
All Trimble OCXOs may work in a Thunderbolt, but not all are drop-in replacements. The one I got was much thicker than the original dead part, and the polarity of the control signal is inverted.I got it working but it won't fit in the original enclosure. On 02/25/2013 04:12 PM, Bob Camp wrote: Hi Keep in mind that the top label on the OCXO shows the order number for the part, not it's part number. Anything you find at auction that's labeled Trimble OCXO probably will work with the TBolt. Bob On Feb 25, 2013, at 6:47 PM, Garren Davis garren.da...@qlogic.com wrote: That makes sense. My inner oven is about 65C. I raised it to that just to get the DAC voltage close to 0v. I can raise it some more to get it between .1 and .9v. I started to look for OCXO's but couldn't find one with the same part number as mine. Mine is 37265 and the others I found did not look like they had the same pinout. Does the tbolt accommodate other model OCXO's? It looks like the circuit board has extra through holes and I always wondered if it was for different OCXO models. Anyways I wanted to see if my homebuilt oven could match a commercial product. It was built from a 73 Amateur Radio magazine article over 10 years ago. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 2:11 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi A typical TBolt OCXO will settle out with a control voltage that's slightly positive (maybe 0.1 to 0.9V) rather than negative 0.7. Since the TBolt is rated to +70C, it's a good bet that the oven in the OCXO is running above 85C. Once things stabilize, you may want to bump your oven temperature up and see what it does to the frequency. Of course with TBolt OCXO's selling at auction for $20 you may or may not want to go to far with this. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:59 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Thanks. I worry a little bit because my setup is not the normal thunderbolt running on the shelf or a rack. The oven for my oscillator is broken so I removed it from the circuit board and put it in a double oven with proportional controller that I built for a long ago project. The thunderbolt is in the outer oven running about 45C and the oscillator is in the inner oven running about 65C. The temperature rise on the display is probably the furnace in the house turning on this morning. I notice that the DAC voltage also rises and falls with the temperature change and wonder if that affects the oscillator in the inner oven. I'll let it run for the rest of the week and see what happens. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 9:35 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi Based on a very short display time, nothing looks seriously broken. I'd suggest running the OCXO calibration routine at some point. Everything is still warming up / settling out for the first week or two, so who knows where it will finish out at. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:00 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have
Re: [time-nuts] Lady Heather numbers
Hi …. the thicker one is a double oven. Well worth the effort. Bob On Feb 26, 2013, at 2:58 AM, Chuck Forsberg WA7KGX N2469R c...@omen.com wrote: All Trimble OCXOs may work in a Thunderbolt, but not all are drop-in replacements. The one I got was much thicker than the original dead part, and the polarity of the control signal is inverted.I got it working but it won't fit in the original enclosure. On 02/25/2013 04:12 PM, Bob Camp wrote: Hi Keep in mind that the top label on the OCXO shows the order number for the part, not it's part number. Anything you find at auction that's labeled Trimble OCXO probably will work with the TBolt. Bob On Feb 25, 2013, at 6:47 PM, Garren Davis garren.da...@qlogic.com wrote: That makes sense. My inner oven is about 65C. I raised it to that just to get the DAC voltage close to 0v. I can raise it some more to get it between .1 and .9v. I started to look for OCXO's but couldn't find one with the same part number as mine. Mine is 37265 and the others I found did not look like they had the same pinout. Does the tbolt accommodate other model OCXO's? It looks like the circuit board has extra through holes and I always wondered if it was for different OCXO models. Anyways I wanted to see if my homebuilt oven could match a commercial product. It was built from a 73 Amateur Radio magazine article over 10 years ago. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 2:11 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi A typical TBolt OCXO will settle out with a control voltage that's slightly positive (maybe 0.1 to 0.9V) rather than negative 0.7. Since the TBolt is rated to +70C, it's a good bet that the oven in the OCXO is running above 85C. Once things stabilize, you may want to bump your oven temperature up and see what it does to the frequency. Of course with TBolt OCXO's selling at auction for $20 you may or may not want to go to far with this. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:59 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Thanks. I worry a little bit because my setup is not the normal thunderbolt running on the shelf or a rack. The oven for my oscillator is broken so I removed it from the circuit board and put it in a double oven with proportional controller that I built for a long ago project. The thunderbolt is in the outer oven running about 45C and the oscillator is in the inner oven running about 65C. The temperature rise on the display is probably the furnace in the house turning on this morning. I notice that the DAC voltage also rises and falls with the temperature change and wonder if that affects the oscillator in the inner oven. I'll let it run for the rest of the week and see what happens. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 9:35 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi Based on a very short display time, nothing looks seriously broken. I'd suggest running the OCXO calibration routine at some point. Everything is still warming up / settling out for the first week or two, so who knows where it will finish out at. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:00 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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.
Re: [time-nuts] Lady Heather numbers
I didn't know Google provided such good views of the house. Facing the house you are looking north. You can see the white GPS antenna behind the satellite dish. It has a pretty good view of the sky east, south, and west. I probably could get it a little higher. You can probably tell from all the antennas on the cars and house that I am a Ham (KB6FAS). This time-nuts thing is just another hobby I don't have enough time to spend on. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Raj Sent: Monday, February 25, 2013 7:41 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers From the attachment I see he is near LA with a nice house with a kidney shaped pool :-) Raj At 26-02-2013, you wrote: If I am not mistaken (and I could be), the Lat/Long suggests that you are in China. Is that correct? Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 11:00 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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.
Re: [time-nuts] Lady Heather numbers
Bob, To me it looks like a d followed by an e just enables the DAC control voltage. Am I missing something? Does it do a calibration of some kind? Thanks for all your help. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 4:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Hi Useful link: http://www.ke5fx.com/heather/readme.htm For a screen command list hit space. Poking around at them can be fun! To get into the OCXO calibration hit d followed by e. Only works after you are locked up. Bob On Feb 25, 2013, at 6:45 PM, J. L. Trantham jlt...@att.net wrote: I am not familiar with the OCXO Calibration Routine. Can you elaborate? I am a 'newbie' with Lady Heather. Thanks. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 11:35 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi Based on a very short display time, nothing looks seriously broken. I'd suggest running the OCXO calibration routine at some point. Everything is still warming up / settling out for the first week or two, so who knows where it will finish out at. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:00 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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. ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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.
Re: [time-nuts] Lady Heather numbers
From looking at the graph over 24 hours it looks like the outer oven varies about +-.5C. This is from the tbolt temperature sensor as the tbolt is in the outer oven. The inner oven where the oscillator is located holds at 66.4C. My concern is that it looks like the tbolt algorithm controls the DAC voltage depending on the temperature that the tbolt reads. Temperature goes up, the DAC voltage goes up. If the inner oven is holding steady then I don't want the DAC voltage changing if the temperature in the outer oven is changing. Is there any way to tell the tbolt algorithm to ignore the temperature in its DAC calculation? Wow, I hope this makes sense the way I explained it. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 6:22 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Hi The unit should not be overly sensitive to temperature. I'd guess that your improvised oven isn't holding temperature very well. The original likely held things to within 0.1 C at some target in the 85 to 110C range. Bob On Feb 25, 2013, at 7:39 PM, Garren Davis garren.da...@qlogic.com wrote: The antenna has a pretty clear view of the sky. I notice that whenever a satellite drops out it causes the oscillator white trace and the DAC green trace to jump around. I wonder why that happens when there are 6 other good satellites. I can go back in time by using the down arrow and I see that it was pretty steady overnight until the furnace turned on to heat up the house. It's amazing how sensitive it is. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Monday, February 25, 2013 4:28 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers OK. Found the problem. Google Earth defaults to 'East' not 'West'. Forgot to tell it North/South, East/West. Looks like your antenna is near the apex of your roof. The 17 minute span of the picture limits the ability to make a 'long term' assessment. However, looks reasonable compared to mine in NW Florida except the temps seem a bit higher. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 5:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers 33 north, 117 west. I am in southern California. -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham Sent: Monday, February 25, 2013 3:44 PM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers If I am not mistaken (and I could be), the Lat/Long suggests that you are in China. Is that correct? Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 11:00 AM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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
Re: [time-nuts] Lady Heather numbers
That should be that v360, Not dxxx to set the View Display time use space or ? for Tbolt help screens Garren posted I notice that whenever a satellite drops out it causes the oscillator white trace and the DAC green trace to jump around. I wonder why that happens when there are 6 other good satellites. The main causes of this is a poor location setting, (do a 24 + hr survey) or the TBolt is using data from some multipath satellite signals. To get more info on how your antenna is doing, can do a 24hr + signal strength plot (sas) To see more about your units performance, can change your display time from 1 min / div (17 min FS) to about 3 days full scale. ~(v360) (Not d360) I typically use 1 day / division for longer term displays (have to change the default 3days of data logging to 30 days using /qxx) ws ___ 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.
Re: [time-nuts] Lady Heather numbers
Hi Sorry about that. Try followed by a Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Tuesday, February 26, 2013 11:32 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Bob, To me it looks like a d followed by an e just enables the DAC control voltage. Am I missing something? Does it do a calibration of some kind? Thanks for all your help. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 4:24 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers Hi Useful link: http://www.ke5fx.com/heather/readme.htm For a screen command list hit space. Poking around at them can be fun! To get into the OCXO calibration hit d followed by e. Only works after you are locked up. Bob On Feb 25, 2013, at 6:45 PM, J. L. Trantham jlt...@att.net wrote: I am not familiar with the OCXO Calibration Routine. Can you elaborate? I am a 'newbie' with Lady Heather. Thanks. Joe -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Monday, February 25, 2013 11:35 AM To: 'Discussion of precise time and frequency measurement' Subject: Re: [time-nuts] Lady Heather numbers Hi Based on a very short display time, nothing looks seriously broken. I'd suggest running the OCXO calibration routine at some point. Everything is still warming up / settling out for the first week or two, so who knows where it will finish out at. Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Garren Davis Sent: Monday, February 25, 2013 12:00 PM To: Discussion of precise time and frequency measurement Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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. ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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.
Re: [time-nuts] Lady Heather numbers
Can anyone comment on the picture. I don't know if what I have would be considered good as far as accuracy and stability is concerned. The screen dump is way too short to give much detail. What can be said from what is there: From a Ham standpoint it is all working fine and is much better than 1e-9. From a time nut standpoint it is very poor. It is using the default setting (for the most part) Phase error at -100ns is ~50 times high for the 100 sec TC setting used, (likely due to the high drift rate of the Osc) Frequency error is wondering around 1e-10 is about 50 times higher than what is possible. Effect on freq and phase noise with sat changes is 10 times more that what is possible with good setup. Concerning your Dac comments, Yes makes sense, but your conclusing is wrong. Can't say or sure, because the 24 Hr + screen shot is not shown, but in general The Tbolt temperature reading has no direct effect on the Dac control voltage unless the Tbolt is in hold over. The Dac voltage changes because the oscillator's freq is trying to change, not the other way around. You can disable the Dac from changing with dd. ws From: Garren Davis Subject: [time-nuts] Lady Heather numbers Hi, I have been playing with my thunderbolt and Lady Heather over the weekend. I hope it's ok that I attached a screen dump of what I have. Can anyone comment on the picture. It's been running less than a day and I don't know if what I have would be considered good as far as accuracy and stability is concerned. Thanks. Garren ** Garren Davis garren.davis at qlogic.com From looking at the graph over 24 hours it looks like the outer oven varies about +-.5C. This is from the tbolt temperature sensor as the tbolt is in the outer oven. The inner oven where the oscillator is located holds at 66.4C. My concern is that it looks like the tbolt algorithm controls the DAC voltage depending on the temperature that the tbolt reads. Temperature goes up, the DAC voltage goes up. If the inner oven is holding steady then I don't want the DAC voltage changing if the temperature in the outer oven is changing. Is there any way to tell the tbolt algorithm to ignore the temperature in its DAC calculation? Wow, I hope this makes sense the way I explained it. Garren 8 ___ 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] FTS 1000A oscillator on the bay
Hi, See my FTS oscillator I'm selling. item number 321080604271 Corby ___ 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.
Re: [time-nuts] Lady Heather numbers
How does one set the AMU value with LH? On 2/26/2013 12:05 AM, Chuck Harris wrote: To quote WarrenS: To allow the Tbolt to work with weak signals from any antenna that I've tried, even when indoors, I start by setting the TBolt's AMU level from the default of 4 down to 0. This can be done with the Tbolt S/W or LH. My general AMU setting goal is to make it low enough so that the TB is always using a minimum of three satellites. If the TB ever does goes into holdover, that should be fixed, because that will cause some serious freq offset noise at the TBolt's output, The usual holdover fix is to give the antenna a better view of the sky and/or lower the TBolts AMU setting. It is better to set the AMU too low which will allow it to use weak signals all the time than it is to set it too high and have No signals even for a short time. After lowering the AMU value, if you want to optimize the setting, LH has all kinds of tools to help, such as the sat signal strength plot. ws -Chuck Harris Garren Davis wrote: The antenna has a pretty clear view of the sky. I notice that whenever a satellite drops out it causes the oscillator white trace and the DAC green trace to jump around. I wonder why that happens when there are 6 other good satellites. I can go back in time by using the down arrow and I see that it was pretty steady overnight until the furnace turned on to heat up the house. It's amazing how sensitive it is. Garren ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1430 / Virus Database: 2641/5632 - Release Date: 02/25/13 ___ 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.
Re: [time-nuts] Lady Heather numbers
Hit the f key then the l key. Garren -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Peter Gottlieb Sent: Tuesday, February 26, 2013 4:37 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Lady Heather numbers How does one set the AMU value with LH? On 2/26/2013 12:05 AM, Chuck Harris wrote: To quote WarrenS: To allow the Tbolt to work with weak signals from any antenna that I've tried, even when indoors, I start by setting the TBolt's AMU level from the default of 4 down to 0. This can be done with the Tbolt S/W or LH. My general AMU setting goal is to make it low enough so that the TB is always using a minimum of three satellites. If the TB ever does goes into holdover, that should be fixed, because that will cause some serious freq offset noise at the TBolt's output, The usual holdover fix is to give the antenna a better view of the sky and/or lower the TBolts AMU setting. It is better to set the AMU too low which will allow it to use weak signals all the time than it is to set it too high and have No signals even for a short time. After lowering the AMU value, if you want to optimize the setting, LH has all kinds of tools to help, such as the sat signal strength plot. ws -Chuck Harris Garren Davis wrote: The antenna has a pretty clear view of the sky. I notice that whenever a satellite drops out it causes the oscillator white trace and the DAC green trace to jump around. I wonder why that happens when there are 6 other good satellites. I can go back in time by using the down arrow and I see that it was pretty steady overnight until the furnace turned on to heat up the house. It's amazing how sensitive it is. Garren ___ 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. - No virus found in this message. Checked by AVG - www.avg.com Version: 10.0.1430 / Virus Database: 2641/5632 - Release Date: 02/25/13 ___ 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. This message and any attached documents contain information from QLogic Corporation or its wholly-owned subsidiaries that may be confidential. If you are not the intended recipient, you may not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message. ___ 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.
