[time-nuts] Lady Heather Makes a Discovery

Greetings, I've been tuning up a new Trimble/Nortel NTGS50AA GPSDO and discovered an interesting phenomenon: Barometric pressure has a larger effect on the device than day-to-day temperature variations. In the attached plot, DAC scaling is 500 uV and TEMP scaling is 5000 milli-degC per

[time-nuts] Another hp Oven For Sale

Greetings, The dealer noted below had another hp oven for sale at the W6TRW Ham Swap meet in Redondo Beach, CA., on May 27th. The unit is a cylinder about a foot long and 5 inches in diameter with sma-size connectors and four shock-mounts attached to the sides. It is marked: Crystal Oven

Re: [time-nuts] Lady Heather Version 5 is now available

Mark, Thank you very much for the effort you put into the new Lady Heather Version 5 code. Comments from other linux users encouraged me to try my luck with a Raspberry Pi 2 Model B. The code compiled without issue and runs perfectly. The pre-configured "heather.cfg" file is a nice touch,

[time-nuts] Mystery hp Ovens For Sale

Greetings, The dealer noted below had two hp ovens for sale at the W6TRW Ham Swap meet in Redondo Beach, CA., on May 28th. The first is a cylinder about a foot long and 5 inches in diameter with few sma-size connectors and four shock-mounts attached to the sides. It is marked: hp oven

[time-nuts] PIC TIC II Board Request

Greetings, PIC TIC II Board Request If anyone has an unpopulated PICTIC II board they would be willing to sell, please contact me off list. Thanks, Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Homemade GPS Receiver

Greetings, The link below describes a homemade GPS receiver. It is presented in a detailed and elegant manner that is certain to appeal to this reflector's subscribers. Peter http://www.aholme.co.uk/GPS/Main.htm ___ time-nuts mailing list --

Re: [time-nuts] OT: Need datasheets on photomultiplier tubes

Ed, I have uploaded a Photonis Catalog (much too large to e-mail) and two data sheets, one of which you mentioned needing, to my web site at: http://www.ni6e.com/PMT/Photonis/ I hope you will find the information useful. Regards, Peter On 1/10/2012 5:37 PM, ed breya wrote: I just picked

Re: [time-nuts] Got 60HZ?

Michael, You can get 32768 Hz from 10 MHz using a single 8 pin PIC. http://www.ni6e.com/time/10M32K.html Regards, Peter On 12/9/2010 4:19 PM, Michael Poulos wrote: The chip was one I got on eBay from a different seller than the Ru movement. The chip number is a C8051T602.It's actually a

Re: [time-nuts] Lady Heather Wish-list

I've used the Lady Heather program for only two months and I'm still discovering the nuances of this incredible software. One thing that seems useful would be to have the \ command write a GIF screen image to disk with the date embedded in the name of the saved file. With that option, the

[time-nuts] hp 7563A Log Voltmeter Service Info Request

Greetings to the List: Can anyone point me to a source of service literature (schematic, specs) for an hp 7563A logarithmic voltmeter? My recent purchase will become a cabinet for a different project if it can't be brought back to life. Thanks, Peter

[time-nuts] Thunderbolt Anomalous Behavior

Greetings, I have posted two plots graciously provided for me by Lady Heather, showing strange behavior in my recently acquired Thunderbolt. It has been powered continuously for the last two weeks. The plots can be seen at: http://www.ni6e.com/TBolt/ An explanation for the abrupt change

Re: [time-nuts] Pictic II mods

%. Errors are not cumulative; each incoming byte restarts the process. The penalty for this tolerance of clock errors is the overhead involved; ten bits are transmitted for each 8-bit byte. Peter Putnam On 7/2/2010 10:01 PM, Chuck Harris wrote: Hi, I only worry about the UART working

Re: [time-nuts] Pictic II mods

in a similar manner. The older FSK modems were much different. They would shift from mark to space tones at the data-rate you used. The filters and tone spacings were typically optimized for 300 bps, but across town, 450 bps was achievable. Peter Putnam On 7/2/2010 6:17 PM, Bob Camp wrote

Re: [time-nuts] Choke Ring Pictures

Easy as pi: Take the first three odd digits 1,3, and 5. Use two of each as 113355. Put a division sign in the middle 113 )355 And you get pretty close... ___ time-nuts mailing list --

Re: [time-nuts] Jupiter GPS DO

Ashley, You will find Microchip PIC code that does exactly what you want here: http://www.ni6e.com/time/GPS_Valid_Fix.html The variables are set for use with a Rockwell Jupiter chip set. Regards, Peter ashle...@aol.com wrote: Hello I wanted to thank everyone who responded when I got

Re: [time-nuts] Loran C sounds

Greetings, As a former user of Loran for aircraft navigation, I can safely say that there is no reason to preserve the system. The antenna required on an aircraft must be vertically polarized and of significant length. The route from the US west coast to Hawaii had no coverage in the middle

Re: [time-nuts] I like Nixie tubes!!

Greetings, If anybody needs a few of the proprietary hp 1820-0092 Nixie driver chips, please contact me off list. Regards, Peter ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] OCXO sensitive to gravitational effects

You have all been a bit stingy with your gravitational inputs on the hp 18011 oscillator... one G this way... two Gs the other way... Here you can see the result of some serious Gs, all applied at the same time... e*.* auction item:160360186935 Add only $56.55 to your bid to

Re: [time-nuts] Spring cleaning and antenna placement

Magnus, If you replace your RG-58 with RG-6 TV coax, your loss issues will disappear. The difference in impedance (75 ohms instead of 50) is not enough to cause problems. Adapters to the pre-fitted F connectors are readily available. And it's not expensive. Regards, Peter

[time-nuts] GPS Valid Fix Detector

Greetings, For those interested in a very simple means of determining if the NMEA data stream from a GPS receiver contains valid fix data, I offer design details for a Valid Fix detector that runs in a Microchip 12F629, an 8-pin DIP device. No other components are required if the GPS receiver

Re: [time-nuts] WWV / WWVH / WWVB

Greetings... I have a used, untested 60 KHz preamp board (no case) for the hp 117A VLF receiver. It is the early model using two 13CW4 nuvistors and a mechanical filter. If anyone is interested, please contact me directly. Regards, Peter Bill Hawkins wrote: Are you open to vacuum tube

Re: [time-nuts] How to get 32.768KHz from 10MHz.

For those still interested in the 10 MHz to 32 KHz divider issue, I offer the PIC source to a tested divider that runs in an 8-pin DIP package device: http://www.ni6e.com/time/10M32K.html Regards, Peter Tom Van Baak wrote: Since synchronization is more important than jitter in this

Re: [time-nuts] Restoring GR 1120-AB Frequency Standard

I've posted some General Radio notes and specifications on their Model 1115-B oscillator, hoping there might be some relevance to the Model 1120. Product specific information starts on page 8. http://www.ni6e.com/genrad/ Regards, Peter NI6E Max Robinson wrote: There must have been several

[time-nuts] Crystal Drive Level

Greetings... I have a well-specified quartz crystal: Bliley BG71A (vintage mid 70's ?) 3.000 000 MHz parallel resonant, 100 pF 80 deg C tempco of 1.5/10e7/deg C over range 79 to 81 deg C in a glass enclosure with 9-pin miniature tube base that I would like to utilize in an oscillator circuit

[time-nuts] GPS Horizon Plots

Greetings, GPS horizon information I have collected during recent travels might be of interest to those siting an antenna for time-keeping purposes. It shows that obstacles to the north of a station in the northern hemisphere are not necessarily detrimental to GPS reception. The opposite is true