Re: [time-nuts] GPS Disciplined TCXO

On Tue, 20 Oct 2015 13:53:54 -0700 Bryan _ wrote: > Saw this on the Hackaday site if anyone is interested. > https://hackaday.io/project/6872-gps-disciplined-tcxo Oh.. that one looks nice. I like the choice of the TXCO. Which allows you to replace it by the pin compatible

[time-nuts] Unified VCXO Carrier Board

I'd like to design a unified VCXO Carrier Board to these requirements: 1. It can host one of the the following VCXOs: 1.1. HP 10811A-6111 (as from 5370A) 1.2 Morion MV89A 1.3 MTI 260 1.4 CV-950 1.5 Timetech 1.6 Axtal 1.7 Pascall 2. It provides unified tuning: 0V = lowest possible

Re: [time-nuts] When NTP goes wrong...

Mark Sims said: > Ars Technica just put up a piece on the effects of various attacks on NTP > with a link to the original paper. > > http://arstechnica.com/security/2015/10/new-attacks-on-network-time-protocol-can-defeat-https-and-create-chaos/ The Network Time Foundation (through Harlan

[time-nuts] Unified VCXO Carrier Board

On Oct 22, 2015, at 3:40 AM, Gerhard Hoffmann wrote: I'd like to design a unified VCXO Carrier Board to these requirements: 1. It can host one of the the following VCXOs: 1.1. HP 10811A-6111 (as from 5370A) 1.2 Morion MV89A 1.3 MTI 260 1.4 CV-950 1.5 Timetech 1.6 Axtal

[time-nuts] The importance of getting time right

Interesting article over on Hackaday this morning mentioning a missile defence system with time drift and the rather tragic consequences. http://hackaday.com/2015/10/22/an-improvement-to-floating-point-numbers/#more-174711 ___ time-nuts mailing list --

Re: [time-nuts] Unified VCXO Carrier Board

Am 22.10.2015 um 19:58 schrieb Garry Thorp: To make things a bit more complicated, Pascall oscillators' tune voltage range is 0 - 10V. Tuning to the nominal frequency is likely to require >5V. That would not stop me, that is in the reach of most op amps, but I was quoted €4k2 + 19% VAT for

Re: [time-nuts] [Bulk] Unified VCXO Carrier Board

Am 22.10.2015 um 18:30 schrieb J. L. Trantham: Don't know if it would help much in your ultimate plan but the concept has been done before as the 53132-60011 and 53132-60016 Optional Time Base Boards for the 53132A counters. These boards will accommodate either an Isotemp OCXO33-46 (HP

Re: [time-nuts] When NTP goes wrong...

Hi, On 10/22/2015 07:54 AM, Rob Seaman wrote: Mark Sims said: Ars Technica just put up a piece on the effects of various attacks on NTP with a link to the original paper. http://arstechnica.com/security/2015/10/new-attacks-on-network-time-protocol-can-defeat-https-and-create-chaos/ The

Re: [time-nuts] Unified VCXO Carrier Board

Gerhard wrote: 5.Board has 2 reference frequency inputs with LTC6957 receivers. One of them can interface the onboard VCXO to the CPLD. As I have said before, there is very little if any advantage to using an LTC6957 at 10MHz (as opposed to using a run-of-the-mill comparator), and the

Re: [time-nuts] [Bulk] Unified VCXO Carrier Board

Charles Your statement about the PN of comparators conflicts with my measurements. The LTC6957 evaluation board had an 18dBc/Hz lower phase noise floor than a comparator circuit with 10MHz 15dBm inputs. However I only measured a single comparator circuit. The Holzworth sine to CMOS converter

Re: [time-nuts] Unified VCXO Carrier Board

The price of the resistors is small change compared to the $8 connector for the 10811. Then again maybe the plan is not to actually build one board with all the parts that will accomodate any of the OCXOs on the list Dimitri At 04:44 AM 10/22/2015, Bob Camp wrote: > 2. It provides unified

Re: [time-nuts] [Bulk] 10811 unsoldered fuse

That probably is an original thermal cutout. It matches ones I have found when repairing 10811As. David On 10/20/15 7:59 AM, J. L. Trantham wrote: Dimitri, That clearly is not the 'original' thermal fuse that I found in my 10811. Mine was a small, axial lead, cylindrical part. It looks

Re: [time-nuts] [Bulk] Re: [Bulk] 10811 unsoldered fuse

David, Good to know. Thanks for the info. Any idea of a source for that part? I don't remember whether my fuse was soldered in or plugged in. Whatever it was, I replaced it the same way. Thanks again. Joe -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On

Re: [time-nuts] Unified VCXO Carrier Board

Hi > On Oct 22, 2015, at 3:40 AM, Gerhard Hoffmann wrote: > > I'd like to design a unified VCXO Carrier Board to these requirements: > > > 1. It can host one of the the following VCXOs: > > 1.1. HP 10811A-6111 (as from 5370A) > > 1.2 Morion MV89A > > 1.3 MTI 260 > > 1.4

[time-nuts] FTDI UT232R-200 cables

Inteknology & Solutions LLC is an electronics/computer recycler in Plano, TX. Recently, they received new old stock FTDI UT232R-200 cables (in FTDI packaging). These cables are listed on eBay at half-price ($14.99) of identical cables at Mouser ($30.00). IF you purchase quantity from Intek, they

Re: [time-nuts] "Selective availability" af accurate time for Apple users?

On Tue, Oct 20, 2015 at 3:09 PM, Paul wrote: > Network connected iOS devices not paired with a watch use (s)ntp at large > intervals rather than the mobile network or GPS. > I expect iOS 9 still has the post-iOS 4 behavior of doing an (s)NTP poll to time.apple.com at

[time-nuts] When NTP goes wrong...

One interesting thing in the paper was that they scanned the entire IPv4 internet address space and found around 13 million NTP servers. Around 3 million of them were serving up the incorrect time. ___

Re: [time-nuts] [Bulk] Unified VCXO Carrier Board

Gerhard, Don't know if it would help much in your ultimate plan but the concept has been done before as the 53132-60011 and 53132-60016 Optional Time Base Boards for the 53132A counters. These boards will accommodate either an Isotemp OCXO33-46 (HP 1813-0931) OCXO for OPT 001, or either of