[time-nuts] LEA-6T effect of position hold

Hi, all The subject of position hold mode in GPS receivers pops up every now and then. Here is a plot that may be of interest to some. Nothing new, but I thought it a nice visualisation of the difference between position hold and "not position hold". I was measuring EFOS 3 against the PPS of a

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

Mike: You can get Eagle 7.7 at: ftp://ftp.cadsoft.de/eagle/program/7.7/ Somehow, that ftp server is still up and serving downloads. --- Graham == On Mon, Jan 23, 2017 at 6:56 PM, Mike Suhar wrote: > Many companies are trying to jump on the subscription band wagon. It is

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

On 1/23/17 4:56 PM, Mike Suhar wrote: Looks like they have a student version but the way I read it you have to actually be a student enrolled in an education institution. I assume they require some form of proof. The usual hack for that is to enroll in a single class at the local

Re: [time-nuts] Thermal effects on cables

A google search for digiwave turned up cheap coax at walmart. I don't know how well copper clad steel holds up in the kHz, low MHz. On Mon, Jan 23, 2017 at 5:01 PM, Bob Camp wrote: > Hi > > Back a long time ago the people I was working with spent time looking > at the impedance

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

Mike, you are correct about Autodesk products being free to students/faculty/and staff with proof of status. A college/university email would do that. I retired from a medium size state university here in late spring. My job there was to purchase, set up, install/administer software and

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

Many companies are trying to jump on the subscription band wagon. It is a way to keep a steady flow of income. Unfortunately, hobbyists are left out in the cold. I have version 7.5 with the hobbyist license. I just tried to get 7.7 but the download pulls in version 8.0. I did not install

Re: [time-nuts] Autodesk Eagle -- maybe they're listening

Hi John: It is still an effective tripling or quadrupling of the cost. I purchased a "non profit" license several years ago for $129. "Non commercial, 4 layers, up to 160 sq cm., all functionality enabled." They converted this to a "standard" license over time. A license was good for the life

Re: [time-nuts] Li-ion Battreries

Hi Mark: I agree. The Vietnam era PRC-25 radio had a solid metal battery box that was water tight and used a BA-4386 battery with Magnesium chemistry. http://www.prc68.com/I/PRC25.shtml#DCP The problem was that as a normal part of its operation the battery releases hydrogen gas. I know

Re: [time-nuts] Thermal effects on cables

Hi Back a long time ago the people I was working with spent time looking at the impedance of a variety of coax cables. The data they came up with on some varieties of cable would suggest that cable is not an outlier… Bob > On Jan 23, 2017, at 3:08 PM, jimlux wrote: > >

[time-nuts] Autodesk Eagle -- maybe they're listening

Autodesk just sent a follow-up to my "new price model unacceptable" complaint a few days ago. It looks like they are going to upgrade the "Standard" subscription ($100/year) to support 4 layer boards up to 160 cm2, which I think matches the current standard version capabilities. Here's a

Re: [time-nuts] Thermal effects on cables

On 1/23/17 9:16 AM, Bob Camp wrote: Hi Nothing is ever simple if you dig deep enough: http://www.jensign.com/RG58U/ http://www.cliftonlaboratories.com/the_curious_case_of.htm here's my guess on the curious case cable: it was mismarked by accident at the factory (e.g. 93 ohm coax, marked

Re: [time-nuts] purpose of time of day display units

They also help weigh the rack down :-) I took this photo before I saw the thread. Robert G8RPi. > On 23 January 2017 at 12:14 Bob Camp wrote: > > > Hi > > Trying to troubleshoot those racks *without* being able to see the timing is > harder than if you can. This gizmo should

Re: [time-nuts] Thermal effects on cables

On 1/23/17 7:13 AM, REEVES Paul wrote: Hi David, Surely the impedance of the cable is only affected by the ratio of the inner conductor and outer conductor diameters modified by the internal dielectric constant, nothing to do with the frequency of operation. You might well have problems

Re: [time-nuts] Thermal effects on cables

On Mon, 23 Jan 2017 15:13:39 + REEVES Paul wrote: > Surely the impedance of the cable is only affected by the ratio > of the inner conductor and outer conductor diameters modified by > the internal dielectric constant, nothing to do with the frequency of >

Re: [time-nuts] Thunderbolt Harmonics

hello to all, to put things right into perspective please note that the famous OCXO hp10811 is "only" specified with harmonics <25 dB (see page 11 of manual https://www.febo.com/pages/hp10811/HP10811AB-Manual.pdf). This device is but still often felt to be useful. Goetz Am 22.01.2017 um

Re: [time-nuts] Thermal effects on cables

Hi Nothing is ever simple if you dig deep enough: http://www.jensign.com/RG58U/ http://www.cliftonlaboratories.com/the_curious_case_of.htm Bob > On Jan 23, 2017, at 10:13 AM, REEVES Paul > wrote: > > Hi David, > > Surely the impedance of the cable is only

Re: [time-nuts] Thermal effects on cables

Dave, the typical spec sheet for VNA cables have a very restricted "lab temperature" range specified. For example 23C +/- 5C. There's a very nice graph showing effect of flexure on phase stability in Fig 2 of this spec sheet:

[time-nuts] Subject: Re: Allan Variance with an HP53132a counter

‌Hi Magnus, Thanks for your enlightening reply. I am indeed looking at a possible process to correct the DeltaDEV bias to provide something approaching the traditional ADEV. Could you please send me a link to your paper on Omega counters ? Indeed the "Australian" paper shows significant skew

Re: [time-nuts] Li-ion Batteries

Balancing series packs is indeed important. This is why laptop batteries have all those pins on their connectors, and why hobby type batteries have balance charge connectors. Although they are different chemistries (laptop and 16450/18650 batteries are typically Li-Ion while hobby type

Re: [time-nuts] Thermal effects on cables

Hi David, Surely the impedance of the cable is only affected by the ratio of the inner conductor and outer conductor diameters modified by the internal dielectric constant, nothing to do with the frequency of operation. You might well have problems converting the larger diameters down to a

Re: [time-nuts] Li-ion Batteries

The biggest mistake you can make if you plan to use them in series not to equalize them before use. They come in different state of charge. Maybe close if from the same lot but not close enough and I do not count on the equalizer. I start with a discharge to 2.5 V and charge two at a time in

Re: [time-nuts] Thermal effects on cables

On 13 January 2017 at 06:52, Ole Petter Ronningen wrote: > Hi, all > > The question of phase shifts in cables pops up every now and then on this > list - I stumbled across a good table of measured phase shifts with > temperature in different cable types in this paper: >

Re: [time-nuts] purpose of time of day display units

Hi Trying to troubleshoot those racks *without* being able to see the timing is harder than if you can. This gizmo should trigger at the top of the minute. Did it trigger? That’s much easier to catch if you can see the minute transition. If the rack goes down, it needs to be back up fast…..

Re: [time-nuts] purpose of time of day display units

http://www.washingtonpost.com/lifestyle/style/for-public-clocks-a-time-warp/2011/10/25/gIQAXOZ5jM_story.html "If the clocks are right — on churches and in classrooms, on stores and in bars — they tell us that things are in order. They tell us that people are paying attention. If a clock is wrong,

Re: [time-nuts] Manual and Software for R (Meinberg) ED170MP GPS Receiver?

Dave, Dave Hallidy wrote: > All- > > I just acquired a Rohde & Schwarz (actually a Meinberg) ED170MP GPS Receiver > (and antenna) and I'd like to get it going. > > Can someone here point me to the manual and any software for it? Please contact techsupp...@meinberg.de for help. I'm sure our

Re: [time-nuts] Thermal effects on cables

On Fri, 13 Jan 2017 07:52:18 +0100 Ole Petter Ronningen wrote: > The question of phase shifts in cables pops up every now and then on this > list - I stumbled across a good table of measured phase shifts with > temperature in different cable types in this paper: >

Re: [time-nuts] Li-ion Battreries

No way will an ammo box explode and send shrapnel flying. Even if filled with machine gun bullets and tossed in a fire. The rubber gasket fails and the pressure escapes. A slow burning object like a battery will never cause steel to fragment. If someone made a video it was faked The purpose

[time-nuts] Li-ion Batteries

I built a switched capacitor balancer. It takes some time to balance a wildly out-of-balance pack but does a great job of maintaining balance during charging and discharge. I run the balancer during pack charging and discharging. I tried it charging an 8S LiFePO4 pack with 7 fully charged

Re: [time-nuts] purpose of time of day display units

One must remember the original use of these displays was displaying IRIG time either distributed from a master clock, locally generated or from a recording (tape) They long predate GPS. There are more sophisticated units that include controls for the tape recorder so you could auto search to a