1 Jun 2012 03:34
1 Jun 2012 03:48
NTGS50AA, better than Thunderbolt?
I got in another NTG50AA unit a couple of weeks ago and have been watching the oscillator (Trimble 34310-T2) age in and stabilize. It started out aging at around 1E-9 parts/day. After two weeks, the aging rate for the last 72 hours was down to the 2E-11 range, with the curve still flattening out. Over the last 24 hours it is down to under 5E-12 parts per day. These numbers are based upon the EFC voltage and known EFC gain. Of course, there could be (and probably is) some aging effects to the EFC DAC/reference voltage. The unit is running while disciplined to GPS. and is not being thermally stabilized. The oscillator seems to be very immune to external temperature effects. Unit temperature has varied +/- 2 degrees C and the air conditioning has been cycling quite a bit (it's been 95 degrees F outside).
1 Jun 2012 04:28
Re: NTGS50AA, better than Thunderbolt?
What is the difference between the -T2 and plain -T??? On 05/31/2012 06:48 PM, Mark Sims wrote: > Trimble 34310-T2 -- -- Chuck Forsberg WA7KGX N2469R caf@... www.omen.com Developer of Industrial ZMODEM(Tm) for Embedded Applications Omen Technology Inc "The High Reliability Software" 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430
1 Jun 2012 04:40
1 Jun 2012 07:43
1 Jun 2012 13:16
Re: NTGS50AA, better than Thunderbolt?
Hi There's a list somewhere that maps the part numbers to who made them. Some OCXO's might be better than others….. Bob On May 31, 2012, at 10:28 PM, Chuck Forsberg WA7KGX N2469R wrote: > What is the difference between the -T2 and plain -T??? > > On 05/31/2012 06:48 PM, Mark Sims wrote: >> Trimble 34310-T2 > > -- > Chuck Forsberg WA7KGX N2469R caf@... www.omen.com > Developer of Industrial ZMODEM(Tm) for Embedded Applications > Omen Technology Inc "The High Reliability Software" > 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 > > > _______________________________________________ > time-nuts mailing list -- time-nuts@... > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.
1 Jun 2012 17:19
ANN: UK MSF 60 kHz interruption, 2012 June 14
Folks, I have received the following notice: __________________________________ Notice of Interruption to MSF 60 kHz Time and Frequency Signal The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio Station will be shut down over the period: 14 June 2012 from 10:00 BST until 14:00 BST The interruption to the transmission is required to allow maintenance work to be carried out in safety. __________________________________ Cheers, David
1 Jun 2012 17:24
Re: ANN: UK MSF 60 kHz interruption, 2012 June 14
David Thanks With the changes to wwvb in the states I may need to turn the antennas towards MSF so my equipment keeps running. Its funny as I was working on the d-psk-r the rcvrs were locking to MSF. That was a chuckle to see. Lets see, a 10 ft loop towards England and a big screen to mask WWVB. Hey is your frequency english or metric?(Continue reading)Regards Paul WB8TSL On Fri, Jun 1, 2012 at 11:19 AM, David J Taylor < david-taylor@...> wrote: > Folks, I have received the following notice: > > ______________________________**____ > > Notice of Interruption to MSF 60 kHz Time and Frequency Signal > > The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio > Station will be shut down over the period: > > 14 June 2012 > from 10:00 BST until 14:00 BST > > The interruption to the transmission is required to allow maintenance work > to be carried out in safety.
1 Jun 2012 16:53
xkcd and time scales
XKCD has weighed in with a suggestion for time and calendar.. http://xkcd.com/1061/
1 Jun 2012 18:26
Re: LPFRS analog C-field adjust
Hi Azelio, On 05/31/2012 04:39 PM, Azelio Boriani wrote: > Today, trying to figure out how to get control of the C-field directly, I > found that the analog fine tune input is already connected directly to the > C-field coil summing point via a 12K resistor, an op-amp (a buffer) and a > 560 resistor. The other contributor is the DAC8800 pin 17 (Voutg) via a > 12K/op-amp/2K7). So the EFC is not A/D converted and then D/A converted > back to analog, at least not in the LPFRS-01 I have (made in 2003). Thanks! Happy to learn this. Will need to test it. Cheers, Magnus
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