[time-nuts] HP Stories: A Service Engineering perspective of the 5061A/B, and the incomparable Chuck Little

Years ago, an old HP Santa Clara Engineer attributed HP's service and support policies to Dave Packard: "HP will provide outstanding service to our customers, and we will make money doing it." Even in the late 1980s, 50 years after HP was founded, the legacy of Packard's influence was still

Re: [time-nuts] PPS clock module

John... I have a nixie tube clock that I purchased at Hamvention about 10 years ago that had an optional chip which worked with a 1 PPS input. It was built around a PIC. Tom Holmes, N8ZM -Original Message- From: time-nuts On Behalf Of Bob kb8tq Sent: Sunday, January 27, 2019 4:34 PM

[time-nuts] Connector help?

Before I got my multi-band splitter/amp I was using a HP-58517A 8 channel unit. It worked reasonably well with GLONASS and BEIDOU L1. GLONASS signal was a bit degraded and you would lose a few satellites. I could even track GPS L2 with an Ashtech Z12, but the L2 carrier phase / pseudorange

Re: [time-nuts] Connector help?

Hi Martin; The ones I have seen use an SMB. Cheers; Tom Knox "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein From: time-nuts on behalf of Bob kb8tq Sent: Sunday, January 27, 2019 3:17 PM To:

Re: [time-nuts] Connector help?

My mistake, I have a 58516A in my hand and it does look like an SMC Cheers; Tom Knox "Peace is not the absence of violence, but the presence of Justice" Both MLK and Albert Einstein From: time-nuts on behalf of Clay Autery Sent: Sunday, January 27, 2019 3:52

Re: [time-nuts] PPS clock module

Or you could go the other way and count it down to a pulse-per-minute, then drive a clock intended for a pulsynetic or similar master clock system. They will mostly be large analog clocks but digital clocks also exist. Still intended for display rather than a panel, but a 19" rack panel would fit.

Re: [time-nuts] PPS clock module

This is what I found http://qrp-labs.com/clockn I have to say there are a lot of arduino code clocks since its a typical starter project but you are right John. Doesn't seem common. Regards Paul WB8TSL On Sun, Jan 27, 2019 at 5:01 PM Bob kb8tq wrote: > Hi > > I don’t think anybody runs a clock

Re: [time-nuts] PPS clock module

I went thru this several years ago and ended up home brew with the following circuit: For adjustment of time indication I added switches to run hours and minutes at 1 pps rate and a switch to stop seconds. Some always on leds for

Re: [time-nuts] Connector help?

It is an SMC connector.  Hard to find and expensive, but worth it to insure that the DC power to the splitter doesn't get accidentally hooked to a signal I/O. I've actually converted a non-ext DC 8 to 1 splitter to external DC. Sent from my Verizon, Samsung Galaxy smartphone Original

Re: [time-nuts] Connector help?

Hi Yes I know, this is beating a dead horse ….. Since the HP splitter will knock out everything that is not right on top of GPS, are you sure you want to go that route? Yes it does depend a bit on the antenna. If it’s one of the telecom / narrowband gizmos then the splitter will not have much

Re: [time-nuts] PPS clock module

Some of the 1970's era National Semiconductor clock modules and chips, you could leave the 50/60Hz input unused and instead jam a PPS pulse into the "colon blink" pin. There were some commercial time display products into the 1990's that used this and other NatSemi clock tricks. For example where

[time-nuts] Connector help?

Planning deployment of an HP 58516A GPS 1x4 antenna splitter with the  external power option (option 05Q)  at our makerspace. Anyone know what the mating DC connector is? martin ___ time-nuts mailing list -- time-nuts@lists.febo.com To

Re: [time-nuts] PPS clock module

Hi I don’t think anybody runs a clock off of a PPS :) That would be nutty …. The closest I have seen is to womp up a “pulse 60 times” gizmo. Drive that off of the PPS. Feed the output into something designed for use in a bedside clock. I’d guess an 8 pin PIC and a few (dozen) lines of code

[time-nuts] Rooftop antenna and splitter

I'm currently using one of those sub-$100 Chinese multi-band antennas. It works quite well. With a L1/L2 survey grade receiver I get position error ellipses in the 6-10 mm range (amazing considering my horrible antenna/multipath environment). Antenna feed is 50 feet of RG6 coax. It feeds a

[time-nuts] PPS clock module

I'm putting together a portable Rb standard and thought it would be nice to include a clock on the panel. I probably haven't hit the magic search words, but I haven't found what I'm looking: a module (no enclosure) that is driven by an external PPS and shows at least HH:MM:SS in 24 hour

Re: [time-nuts] Rooftop antenna and splitter

On 1/27/19 6:24 AM, Bill Slade wrote: Hi again, The very best GNSS antennas tend to be based on suspended patch antenna (air-dielectric) structures because they give the best bandwidth/radiation efficiency (and hence, noise temperature) performance.  The very best include choke-rings for

[time-nuts] GNSS Antennas (was: Rooftop antenna and splitter)

On Sun, 27 Jan 2019 14:24:52 + Bill Slade wrote: > The very best GNSS antennas tend to be based on suspended patch antenna > (air-dielectric) structures because they give the best > bandwidth/radiation efficiency (and hence, noise temperature) > performance. While it is true that

Re: [time-nuts] Rooftop antenna and splitter

Hi True indeed and for about $10,000 you can get pretty close to “the best”. If you want to slum it, you can get “pretty good” for about $2,000. If you are truly after high end performance new is the way to go. Getting the full modern suite of signals on a used one …. not so much. Even

Re: [time-nuts] Rooftop antenna and splitter

Hi Denny and list, Some thoughts from me...worth about what you paid for them considering my Time-Nuts membership card was revoked the week before last for heresy, hahaha! ;) PCTEL GNSS1-TMG-40N (https://www.pctel.com/antenna-product/global-gnss-timing-antenna-gnss1-tmg-40n/) I've got

Re: [time-nuts] Rooftop antenna and splitter

Hi again, The very best GNSS antennas tend to be based on suspended patch antenna (air-dielectric) structures because they give the best bandwidth/radiation efficiency (and hence, noise temperature) performance.  The very best include choke-rings for multipath suppression (Dorne-Margolin &

Re: [time-nuts] Rooftop antenna and splitter

Hi With things like the uBlox F9 now out on the market cheap …. I would go with an antenna that will do L1 / L2 / L5 and work with everything that it up there. You still are in the “under $100” range (delivered) for new product from China. It’s a good bet that the guts of all of them are made

Re: [time-nuts] Rooftop antenna and splitter

Hello Denny, Things to keep in mind: 1. To keep noise performance, LNA gain at the antenna should be at least 10 dB above total losses in antenna cable & distribution network. 13-16 dB above is better. Something like this would be more than suitable for a 30 ft run:

Re: [time-nuts] Rooftop antenna and splitter

For a 30-35 outdoor cable run go with as big a coax as you can afford. At these frequencies attenuation becomes even more critical than say an HF application. There are several online attenuation calculators for various cable configurations that you might want to play around with:

[time-nuts] Rooftop antenna and splitter

Hi all, I’m looking for recommendations on an antenna / splitter configuration. I currently have six GPS/GLONASS/Galileo timing devices, each with it’s own puck antenna in a window. I have an opportunity to move to a (single) roof top antenna, with a splitter to feed the individual devices,