Re: [time-nuts] LH and Leo Bodnar GPS

I'll second this request. Wes  N7WS On 2/16/2018 1:01 PM, Jerry wrote: Any chance that Lady Heather can be modified to connect to a USB (non-serial) device such as the Leo Bodnar GPS? Jerry NY2KW ___ time-nuts mailing list -- time-nuts

Re: [time-nuts] eBay GPS antennas

On 2/16/2018 11:31 AM, Stewart Cobb wrote: ... For example, any AeroAntenna whose part number starts with "AT2775" is a dual-frequency L1/L2 GPS antenna. AT2775-42 is a near-survey-grade antenna, and one of them is available right now (item 263500294711) at a starting bid of $20, after expiring

Re: [time-nuts] GPS Jamming

This has been going on a long time. http://defense-update.com/products/g/gps-ajr.htm I was involved with testing this in the field years earlier. Wes On 1/26/2018 7:57 AM, Gary Neilson wrote: Don't know if this has be posted before or not. Also don't know if this will affect timing info

Re: [time-nuts] HP 3048 question: how to export graphs?

choice or to the clipboard. Wes  N7WS On 10/15/2017 12:46 PM, John Miles wrote: I don't believe there's a way to save images from within HTBasic, although there certainly should be. I use the "Snipping Tool" accessory in Windows 7 for that sort of thing. It probably exists in al

Re: [time-nuts] GPS Antenna Feed Line Decision

money in my wallet before I leave.  I count it again when I get back.  The difference is my expense." Wes .  On 9/4/2017 2:26 PM, Bob kb8tq wrote: Hi A lot depends on just which outfit you buy your attenuators from. There certainly *are* outfits out there that supply you just over 20

Re: [time-nuts] GPS Antenna Feed Line Decision

.belden.com/docs/upload/hdcarltp.pdf and http://www.keysight.com/upload/cmc_upload/All/E206COMPTEST_METHOD.pdf. At least the authors admit, "Thus far we have seen little difference in the data." Wes On 9/3/2017 3:02 PM, Bill Byrom wrote: For precision timing measurements, I would

Re: [time-nuts] GPS Antenna Feed Line Decision

Doesn't make any sense unless one has $$ as a top priority, already has a spool of RG-6 quad shield, etc...  but I specifically stated that $$ is not a top priority  Not really even in the top 5 or 10... Then by all means you should use L-band waveguide. :-) Wes ___

Re: [time-nuts] GPS Antenna Feed Line Decision

: https://www.pasternack.com/t-calculator-noise-figure.aspx The secret here is the 26 dB gain. Wes  N7WS On 9/2/2017 11:57 AM, Clay Autery wrote: Having decision-making problems for the materials for my GPS main feedline.  Going to use a TM LMR stock, just can't decide how big to go

[time-nuts] Latest Lady Heather

I asked about this before but got no response. I know of John Miles' site where I downloaded v5 but I've seen a post by Mark Sims about further enhancements and wonder where I might get the latest. Mark seems to have an "unlisted number." Th

Re: [time-nuts] Anderson PowerPole (was Charles Wenzel GPSDO)

a zip tie. I am certainly not the only one who has had issues with this. And lest I be called an idiot, this is with a factory assembled and supplied pigtail. Regards, Wes On 6/22/2017 12:19 AM, Tom Van Baak wrote: Wes, Don, I am quite surprised at the negative reaction to Anderson Power

Re: [time-nuts] Charles Wenzel GPSDO

I never had such problems with radios with Molex connectors. Wes Stewart On 6/21/2017 2:36 PM, Brooke Clarke wrote: Hi Chuck: I'd replace the push on DC power connector with a high force Power Pole. I can't count how many times one of these push on connectors has worked itself lo

Re: [time-nuts] GPS Antenna on Tower.

Mark, Excuse my ignorance but where do I find this version? Wes On 6/20/2017 9:34 AM, Mark Sims wrote: I just added the ability to calculate solid earth tides and the vertical gravity offset due to the sun and moon to Lady Heather. The lat/lon offset is typically around +/- 60 cm per day

Re: [time-nuts] GPS Antenna on Tower.

It was bright sunshine and 46 degrees C here in the desert near Tucson, Arizona yesterday. It would take a lot of cooling to keep that solar collector (radome) cool. Wes Stewart On 6/19/2017 9:42 PM, Thorbjørn Pedersen wrote: http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx Have

Re: [time-nuts] Smart Phone time display accuracy...?

My iPhone seems to be accurate to 5 minutes or so. There are two of them in my house and they never agree. My computer is saying 1:15 PM local time, my iPhone says 1:20PM On 3/15/2017 7:32 PM, Mike Baker wrote: Hello, Time-nutters-- Any thoughts on what the likely accuracy of smart phone

Re: [time-nuts] Vintage Frequency Measurement

On 2/13/2017 12:56 PM, Brooke Clarke wrote: Wes: Is this the patent for the IMPATT diode power amplifier? https://patents.google.com/patent/US3931587 No. As I recall the designer (or at least a prime mover) was a guy named Eisenhart. The Hughes organization at the time had engineering done

Re: [time-nuts] Vintage Frequency Measurement

it in the PU and hauled it 50 miles to the missile site, plugged it in and tweaked the widget using the counter. I had visions of a Titan Missile targeted to hit Vladivostok landing on Tokyo instead. Wes Stewart 2/12/2017 7:31 PM, Bob Camp wrote: Hi If you look at a typical BC-221 in use

Re: [time-nuts] New stuff in my Tindie store

Most of the citizens of the state of Arizona are smart enough to know that you can't actually save any daylight with daylight savings time. Hence, we remain on Mountain Standard Time. The Navajo Indian Nation, whose territory spans parts of three states, including northeast AZ, decided to

Re: [time-nuts] Man with too many clocks.

compensate the inductor than the variable capacitor that was very robust. Before synthesizers, I built a VFO for a homemade receiver using one of these cannibalized from a freq meter. Wes Stewart, N7WS ___ time-nuts mailing list -- time-nuts@febo

Re: [time-nuts] Temp/Humidity control systems?

On 10/30/2016 10:18 PM, Bill Hawkins wrote: Think of the fun you'll have determining the heat flow model constants for the system. In particular, there's no air flow sensor because they are expensive. You'll need to determine the relation between fan speed and air flow. You can buy an automotive

Re: [time-nuts] Temp/Humidity control systems?

On 10/27/2016 6:43 AM, Ron Bean wrote: BTW some of us are more sensitive to humidity than others. I can't tell you the RH of a room, but I can tell you when it's too dry for comfort. I want it as close to 50% as I can get it without growing mold on the walls. Some "experts" claim that 30% is

Re: [time-nuts] Has anybody checked this? GPSDO in kit

On 10/22/2016 9:22 AM, Chris Albertson wrote: You have to remember what this thing replaces. In ham radio, some people are using vacuum tube oscillators with mechanical variable capacitor tuning. Maybe some advanced rigs use gear drive on the capacitor shaft to allow more exact tuning This

Re: [time-nuts] Need Time Help

s activity many years ago, there remain some of us, who are not Luddites, but still believe that "Deep Search Decoding" is a questionable practice, no matter how it is rationalized. Nevertheless, the referenced paper should explain the need for precise timekeeping. On Wed, Oct 5, 201

Re: [time-nuts] Need Time Help

If you are working "real" EME where you, and not a computer plus lookup table, are coping the signals, none of these precise timing issues exist. Wes N7WS On 10/5/2016 6:18 AM, Peter Torry via time-nuts wrote: I must admit to being rather puzzled at the sub microsecond timing r

Re: [time-nuts] Measuring phase with an HP 3456A?

) As Bob Camp said earlier, both sources are not on nearly the same frequency but exactly the same frequency. If you are thinking of measuring something other than this, then we have a semantics issue and need clarification of what it is you want to know. Regards, W

Re: [time-nuts] Measuring phase with an HP 3456A?

On 10/1/2016 5:13 PM, Bob Stewart wrote: Hi Bob Albert, Completely eliminate the use of the term "DMTD". I didn't post that. Actually you did in your first post. "I've been spending a small amount of my time looking into making a sort of hybrid DMTD with a pair of DBMs"

Re: [time-nuts] Clean 10 MHz ref

runs on even a laptop USB port. Wes == Folks, Mine's running of a standard PC USB port, and the power consumption measures between 220 and 240 mA. With the supplied software (mine dated 2016-May-10, but that may have been the install date) setting

Re: [time-nuts] Clean 10 MHz ref

embedded frequencies with the existing software. There has been a veiled promise of improved software that remains unfulfilled. It is a GPSDO, although the internal oscillator is a TCXO, not an OCXO. Mine runs on even a laptop USB port. Wes

Re: [time-nuts] DIY VNA design [VNA-Nuts?]

I agree. On 8/22/2016 2:44 PM, Attila Kinali wrote: On Mon, 22 Aug 2016 14:20:59 -0400 Bob Bownes wrote: Just finished creating it at groups.io *https://groups.io/g/svna * and sign up. :) Is there any advantage of using groups.io compared to a

Re: [time-nuts] DIY VNA design

an HP8410 then an HP8510, I never cease to be amazed that I can hold something with similar accuracy (albeit less frequency range) in the palm of my hand. Wes On 8/20/2016 11:37 PM, Bob Albert via time-nuts wrote: Well that's a start. Thanks for the link! I would need more information, as this pr

Re: [time-nuts] Low cost SDR suitable for phase noise measurement?

Where can I find this mod? On 8/11/2016 11:36 AM, Brooke Clarke wrote: Hi Bob: The SDR-IQ has a lower frequency limit of 500 Hz. http://www.prc68.com/I/Bats.shtml#SDRIQ There is a mod that replaces the on board 66 MHz oscillator with one locked to 10 MHz.

Re: [time-nuts] OXCO Spurious Output at Line Frequencies

I retired in 1999 so it's been a long time since I used one, but I don't recall ever seeing a device measured using an HP 3048 system that didn't exhibit line frequency (and harmonic) spurs. See the "live" plots at the end of this page: http://hpmemoryproject.org/news/3048/hp3048_01

Re: [time-nuts] The home time-lab

I have for years powered much of my ham station with a 90AH SLA maintained with a homemade "smart" charger. I used an analog Astron 35A power supply (RS-35M) for its raw DC and series pass transistors with its regulator board replaced with a (now obsolete) AA Engineering smart charger board.

Re: [time-nuts] I thought GPS repeated every 12 hours (-2 minutes)

testing. As someone who operated amateur radio moonbounce on 2-meters back in the day when you actually had to hear the signals, I find this really hard to believe. Wes N7WS ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https

Re: [time-nuts] Simple solution for disciplining OCXO with 1 PPS

A cleaver design, but the OP wanted 1pps. I have the Leo Bodnar GPSDO. It too is a nice frequency standard, but it doesn't know what time it is. On 5/24/2016 9:53 AM, Graham / KE9H wrote: If you want an "existence proof" for a simple, mostly analog, a few digital counters, no software or

Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

Congratulations Tom, I'm a lurker here and learn something every day. I'm also in Tucson and have spent a lot of time on Mt. Lemmon so that hook is really cool. My recorder is all set. Locally on PBS at 9PM. Wes N7WS On 5/17/2016 7:50 PM, Tom Van Baak wrote: The TV show is tomorrow

Re: [time-nuts] GPS position

Nothing to do with time but... Technically speaking, in surveying a bench mark is a vertical control point. In playing with Geocaching I've located bench marks that were placed in the 1930's and never found again (until I did). There were often a hundred feet or more from where the

Re: [time-nuts] HP Reliability

reporting consisted of counting the money in his wallet when he left and counting it again when he got back. The difference was his expense. Wes N7WS On 2/14/2016 4:05 PM, Jeremy Nichols wrote: I was with HP 1972-79, when it was still a great company. The vertical integration

[time-nuts] HPZ3801 Failure

a Z3801 with similar problems? Thanks for any help. 73, Wes WA5TKU ___ 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.