Re: [time-nuts] Are we really on the right track?

http://www.economist.com/news/science-and-technology/21723095-does-one-thing-lead-another-time-may-be-fuzzy-if-so-idea-causality N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Glass enclosed crystals

I've a batch somewhere in the 85-150 KHz range. Pencil sized diameter with wire leads taken from DECCA equipment. Bought them in the 70s from Meshna in Boston. Figured might be fun to play with in the VLF band that some were playing with. Now of course DDS is probably the way to go. Now

Re: [time-nuts] Gregorian Calendar

OK, not to the precision this group uses, but interesting: "https://www.stratfor.com/analysis/geopolitics-gregorian-calendar;>The Geopolitics of the Gregorian Calendar is republished with permission of Stratfor." https://www.stratfor.com/analysis/geopolitics-gregorian-calendar N0UU

[time-nuts] Counter Clock freq lock advice

Back from Dayton and found in my mailbox a PLJ-9VFD-A9 digit frequency counter block. Fresh from eBay. Very nice piece of gear for about $20. It has a 13 MHz voltage controlled time base marked 1300446 TW 499K. Pin out seems standard and the Voltage Control on pin 1 simply goes to a (I

[time-nuts] Why no cheap timing grade GPS antennas?

Note in the last digest indicated that some of the patents run out in 4 years. Looks to me that some plastic stamped choke ring with suitable metallic coating should be cheap in bulk. Finding the phase center might be interesting, but... N0UU

Re: [time-nuts] Arrived!

Christmas lights up first and then to play. Looks neat. Now for a serious timing antenna and RF splitter. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] New GPS module

Lesson learned. Will not use the tiny URLs again. On Kickstarter and Indigogo you pay thru PayPal and get the money back if it doesn't fund. Of course, I'm the guy that put $500 non-refundable down on a car where the mfg hasn't even built the plant! http://eliomotors.com N0UU

[time-nuts] New GPS chips on Indegogo

This isn't drawing lots of attention, but really looks promising: http://bit.ly/1dBpits or http://t.cn/8FvCEX7 Regular GPS or Chinese version or RAW. The first two presently Arduino compatible. For not much money. Hope it gets funded. N0UU ___

Re: [time-nuts] GPS time module

Sorry if already posted: http://www.saelig.com/COMCR/COMCR002.htm ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] Odd propagation

The LF guys really noticed this this weekend. Good reason for us to have a band there. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions

Re: [time-nuts] Rb danger

I just finished Bernard Jaffe's history of chemistry book. The Curies spent years in a small building with tons of ore boiling, mixing, filtering, etc to get a small bit of radium. He died (with some radiation changes) by getting his head run over by a car. She died as an old lady of

Re: [time-nuts] RDR

Used to buy direct. Now seem directed to eBay. Wonder if that simply isn't easier for them. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the

Re: [time-nuts] GPS antenna inside

I tried a much stronger signal on XM radio inside on the window ledge. Worked well in the car, but not the kitchen. Finally realized that I had UV coated windows and the signal was almost not there. Opened the window, put the puck outside, scrunched the mini-cable under the closed window and

[time-nuts] Sarantel GPS Antennas

Spark Fun has the Sarantel SL1204 Helix antennas: .8 dB NF 18 dB gain small size. 1.8 to 3.6V supply. Dielectric loaded helix. $22.00 Made to work with small near field. These should work with modern GPS receivers very well. I'm awaiting a couple of small diameter cables with SMB

Re: [time-nuts] Voltage on antennas

Some of the little magnetic attached antennas on eBay will operate on 3-5V. More problematic is using the older antennas which require 5V with the newer chips such as the LEA-5,6,7 series which run on 3.3V. There is an internal Bias T, but I haven't tried to bring in 5V through the Vant pin

[time-nuts] GPS antennas

I purchased several of the Larson GPS antennas on eBay. Various sites have several different specs so I opened one. Since they were advertised as Timing Antennas I hoped to find some scalar rings or such. Inside was a nice plated board with gold looking plated traces, a dual pole ceramic

Re: [time-nuts] Pulsars

The Ham expert on this has to be Tom Clark, W3IO, of AMSAT and the TAC system offered at one time by TAPR. He did a lot of timing professionaly using these as I recall. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] LEA-6T kit

I bought one several months ago, but summer activities prevented building yet. Well done and doesn't look too hard. The LEA-6 isn't real small if you have a magnifier of some sort. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To

[time-nuts] Rigol scopes

I bought one of the 50 MHz versions at Dayton last year. OK for my needs. Not mentioned here is that the difference between the 50 and 100 MHz scopes is software control of roll off on the input. I haven't done it, but procedure was available on the WEB on how to spoof the software. N0UU

[time-nuts] 5V GPS antenna on 3.3V device?

How's the best way to run an older 5V antenna with the new 3.3V GPS engines? Bias T? N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions

Re: [time-nuts] LEA6-T Group Buy

Note that there should soon be a LEA6T eval board available from sysmocom http://laforge.gnumonks.org/weblog/2012/03/16/#20120316-osmo_lea6t_gps_timing Estimated price is 90 EUR excl VAT in the EU. Anyone know if these will have the RAW output for use with RTKLib? Also assume can

[time-nuts] eBay Ublox

Thanks for comment. At that price figured he had a bunch or they lacked in utility. Did buy one to play with the PPS. Thanks, N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

[time-nuts] Rigol DS1102E down to $400

There is a software hack to disable the lowpass filter in the units to turn the 50 MHz one into a 100 MHz one. Apparently no difference in hardware. The procedure is one the WEB. I bought one of these at Hamvention and have been pleased. No, I haven't taken the time to do the hack. N0UU

[time-nuts] eBay Ublox

UBLOX TIM-CJ module TIM-ST GPS engine Jupiter footprint anyone have any experience with this for timing application? N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Distance between GPS Antennae

I saw a road grader this summer with a GPS antenna on each end of the blade, about 10 feet. Must have been using RTK . So that distance should be OK. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Farm GPS jamming?

Here in Kansas near a bombing range. Last year I was pheasant hunting nearby with a farmer big into precision ag, RTK on all equipment. Walking across a grain sorghum field I commented about a very crooked set of rows compared to the rest. Oh, a B2 went over and it takes a while sometimes

Re: [time-nuts] Low tech stealth monitoring

Stealthy doesn't mean invisible. Think low tech.. a bunch of guys out in the desert with cellphones .. I just heard it come over Here in Kansas we still have some 50s watch towers from the 'Gawk Tower' days. Lots of people spent some cold nights here on the phone to some central location

Re: [time-nuts] Pear shaped earth

Interestingly, until there were artificial satellites, you couldn't tell that the earth is slightly pear shaped. You need to read Measure of the Earth N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Bob Pease

One of his books was something like: Driving into an accident.!!! N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.

Re: [time-nuts] New clock

Have an extra $1,500? http://www.symmetricom.com/products/frequency-references/chip-scale-atomic-clock-csac/SA.45s-CSAC/ N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Wide angle light into ST connector/multimode fiber?

I want to get light from a wide angle (30 degrees or so) into a multimode fiber cable to feed a fast MF466 photodiode for short distance sensing. That fiber is really small to focus on. Anyone done this...looking at a reflection of a red laser diode flashing dot a couple of meters away

Re: [time-nuts] Gears.....Digital??

I visited a house in Holland where the whole ceiling was one great solar system display and the attic a maze of geared mechanisms to control it all. Supposedly all that needed to be done was to repaint each decade the year plank that moved along counting the years. Strange that a man would

Re: [time-nuts] digital....gears

A quick review of my pictures of the visit to the Eisinga Planetarium, especially of the attic mechanism now make me think that his mechanism is a mix of digital gears and analog string driven mechanisms. I'm still amazed at his work. N0UU ___

Re: [time-nuts] Lightning strikes vs GPS antennas

Haven't done this yet, but take a look at Digi-Key parts: IF-E91D, IF-D91, and the SH4001 fiber. On my to do list. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts

Re: [time-nuts] Fiberoptic 10MHz link

I have access to my roof and above through a trap door I had installed when we built the house. Also have AC in the attic. I've been reluctant to put a GPS up there with a direct link to the shack and computers, etc. Has anyone done a simple circuit for conversion from a 10 MHz signal into,

Re: [time-nuts] Mu Metal

For anyone wanting to add LF EM shielding to a project, Electronic Goldmine has a weekend special of UltraPerm at $5 for an 8X11 inch sheet. Half of the normal price and pretty rare in singles. N0UU ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Missing GPS satellites (Mike Feher)

Just went to a farm meeting on GPS farm machinery control. At least one equipment mfgr commented that they use GPS but have Glosnoss ability for the times that GPS is limited here in the states. N0UU ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] High accuracy GPS position

Farmers around here use GPS guided equipment to guide their farm equipment. It is possible to put fertilizer in one inch strips around the field and later go back and plant in the same strip. Some use a reference transponder to increase accuracy. Others seem to be able to use references on

Re: [time-nuts] Feynman

Gee, I must have done something wrong. Ran the first hour from the link, book marked it, then in the upper right corner is a drop down of the 7 lectures. I'm on hour 4. XP with SP3. This is my Internet computer that I let MS have it way with. The good stuff is on a couple of other boxes.

Re: [time-nuts] LF power supply noise

Again, you might try electronic goldmine's mu metal shielding. Used to be used as a shield around CRTs, etc. Their version is sticky on one side so might make a good trial wrap. N0UU ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe,

[time-nuts] Re :rubidium osc box

If you want to go totally crazy on a shielded box, check out Electronic Goldmine's MU metal sticky shielding. Used to be used on CRT shields, etc. Probably not needed, but should kill a bunch of LF noise. Make a sandwich over the wires entering the box, etc. N0UU