[time-nuts] Datum PRS-45A Operating Data

Hello all, I got the monitor program working and connected to the PRS-45A Cs. Attached is the screenshot of the data I got. Can anyone translate the data into something meaningful for me as a newbie? Is this thing healthy? Thanks all Eugene ___

Re: [time-nuts] GPS active antenna delay ?

On Sat, 7 Feb 2015 10:07:44 -0800 Tom McDermott tom.n...@gmail.com wrote: While compensating for cable delay is relatively straight forward by measuring the length and compensating for the velocity factor, a question is: how much amplifier / filter group delay is to be expected within the

Re: [time-nuts] TimeLab with Wine: No RS232 interface available

Don't remove the serial mouse, just disable it. If you remove it, it will return on the next reboot. On 2/7/2015 9:11 AM, Jim Lux wrote: There's also the whole microsoft serial mouse device problem. A typical Windows 7 install (and other versions as well) will have a MS serial mouse device

Re: [time-nuts] question Alan deviation measured with Timelab and counters

Hej Attila, On 02/06/2015 01:22 PM, Attila Kinali wrote: Moin Magnus, On Wed, 21 Jan 2015 07:07:54 +0100 Magnus Danielson mag...@rubidium.dyndns.org wrote: For oscillators, they should have been turned on long enough such that any drift is negligible. Alternatively you process out the

Re: [time-nuts] Datum PRS-45A Operating Data

Hi Eugene, A quick look, it looks healthy. About 2 years of tube operation, you should be good for quite some time. Cheers, Magnus On 02/08/2015 06:45 AM, W2HX wrote: Hello all, I got the monitor program working and connected to the PRS-45A Cs. Attached is the screenshot of the data I

Re: [time-nuts] GPS active antenna delay ?

Attila, On 02/08/2015 11:11 AM, Attila Kinali wrote: On Sat, 7 Feb 2015 10:07:44 -0800 Tom McDermott tom.n...@gmail.com wrote: While compensating for cable delay is relatively straight forward by measuring the length and compensating for the velocity factor, a question is: how much amplifier

Re: [time-nuts] GPS active antenna delay ?

On 2/8/15 2:11 AM, Attila Kinali wrote: On Sat, 7 Feb 2015 10:07:44 -0800 Tom McDermott tom.n...@gmail.com wrote: While compensating for cable delay is relatively straight forward by measuring the length and compensating for the velocity factor, a question is: how much amplifier / filter group

Re: [time-nuts] GPS active antenna delay ?

I think that the surplus HP/Agilent GPS splitters may have an SAW filter. If so, measuring the delay of one of those could yield at least an approximation. I may have that data laying around; I'll do some digging. John On 02/08/2015 05:11 AM, Attila Kinali wrote: On Sat, 7 Feb 2015

Re: [time-nuts] GPS active antenna delay ?

j...@febo.com said: OK, so I had an HP 58535A two-port GPS splitter handy and put it on the VNA. It clearly has a filter of some sort, as shown by the S21 frequency response. The delay at the center of the passband is about 21ns, and it increases to about 26ns at the edges. Thanks. It

Re: [time-nuts] GPS active antenna delay ?

OK, so I had an HP 58535A two-port GPS splitter handy and put it on the VNA. It clearly has a filter of some sort, as shown by the S21 frequency response. The delay at the center of the passband is about 21ns, and it increases to about 26ns at the edges. That delay consists of the physical

Re: [time-nuts] GPS active antenna delay ?

Hi all. The papers are: 1) SAW Filter Modeling in MATLAB for GNSS Receivers, S.H. Abbas, et al., IJECE Oct 2013, ISSN: 2088-2078 The authors de-embed the group delay using FFT and MATLAB. Eyeball about 15-20 nsec. for a pretty wide filter. 2) The Effects of SAW Group Delay Ripple on GPS and

[time-nuts] MSF Scheduled Maintenance Periods

MSF Scheduled Maintenance Periods The MSF 60 kHz standard-frequency and time signal, broadcast by Babcock on behalf of NPL, is occasionally taken off-air to allow maintenance work on the masts and antennas at Anthorn Radio Station to be carried out in safety. This means that your