Re: [time-nuts] GPS clock offset frequency

On 09/28/2010 11:54 AM, Alexander Mayer wrote: Can someone on this list provide me with a definitive engineering reference (not a second party academic assumption of the value) that provides the actual offset frequency of on-board GPS clocks set by the engineers? GPS ground clocks have a funda

[time-nuts] antennas

Read through the comments at the start of the file heather.cpp There is an option for Heather to control the temperature of the Tbolt.  This is most easily done by enclosing it in a box and using a small fan to pump ambient air into the box.  Heather has a nice PID controller (that Warren Sark

Re: [time-nuts] Mostly Relevant: Comic

On 09/28/2010 02:19 PM, Oz-in-DFW wrote: Committee to Decide on How Long a Second Should Be... http://comics.com/f_minus/2010-09-28/ A not quite layman's view Answer: Just long enough to be boring but short enough to be quickly lost. Cheers, Magnus ___

Re: [time-nuts] antennas

On 09/28/2010 09:38 AM, Hal Murray wrote: What is the purpose of the temperature sensor chip on the PCB, anyway? Isn't the temperature inside the OCXO much more important? The OCXO isn't perfcet. The frequency will shift slightly with environmental temperature changes. Let's consider a the

[time-nuts] Mostly Relevant: Comic

Committee to Decide on How Long a Second Should Be... http://comics.com/f_minus/2010-09-28/ A not quite layman's view -- mailto:o...@ozindfw.net Oz POB 93167 Southlake, TX 76092 (Near DFW Airport) ___ time-nuts mailing list -- time-nuts@fe

[time-nuts] Info required on Oak OCXO

I have acquired on old Oak Frequency Control 10MHx OCXO, but have been unable to find any info on it, and was wondering if anyone was familiar with it? The label on top has the following on it: OFC 2940221-2 10.00 MHz 11628-13147 9952 It is a 2 inch by 2 inch by 1 inch unit. It seems tha

Re: [time-nuts] Thunderbolt Anomalous Behavior

Hi Temperature moved about 8 C. That's enough to get a bad solder joint going. Bob On Sep 27, 2010, at 11:19 PM, Peter Putnam wrote: > Greetings, > > I have posted two plots graciously provided for me by Lady Heather, showing > strange behavior in my recently acquired Thunderbolt. It has b

Re: [time-nuts] antennas

Hi The TBolt firmware does not interact with the ocxo's temperature controller. Bob On Sep 28, 2010, at 1:46 AM, "russell" wrote: > Isn't the temperature inside the OCXO oven held at a set point (greater than > ambient) with it own independent thermostat? The DS1620 thermometer only > re

Re: [time-nuts] GPS clock offset frequency

> Can someone on this list provide me with a definitive engineering reference > (not a second party academic assumption of the value) that provides the > actual offset frequency of on-board GPS clocks set by the engineers? Google for >10.229 999 999 543< gets 2 hits. Google for >10.229 999 995

[time-nuts] GPS clock offset frequency

Can someone on this list provide me with a definitive engineering reference (not a second party academic assumption of the value) that provides the actual offset frequency of on-board GPS clocks set by the engineers? GPS ground clocks have a fundamental frequency of 10.23 MHz. The GPS satellite

Re: [time-nuts] My Palisade Issues resolved + Checking Stability and accuracy :)

> Just had to make a bit of a patch to the refclock_palisade.c driver, and > send a character to the device, for hardware polling.. We suspect that > perhaps my RS422 to RS232 adaptors might not set RTS or CTS high without > data being present... That seems pretty strange. Can you confirm it

Re: [time-nuts] antennas

> What is the purpose of the temperature sensor chip on the PCB, anyway? Isn't > the temperature inside the OCXO much more important? The OCXO isn't perfcet. The frequency will shift slightly with environmental temperature changes. It may have been more important without the high-quality OCXO