Re: [time-nuts] Charles Wenzel GPSDO

I couldn't agree more! I have converted loads of equipment to the so-called 'standard' Power Pole. What a disappointment. IMO, they are poorly designed and ineffective. Sure, they offer commonality, but at what cost? The DO come apart easily, and if the radio (equipment) happens to be on, v

[time-nuts] TruePosition on the Arduino

The address on my display is 0x3F. I have a kit that was put together by the Packrats and the display works with their code. Randy VE3AX On Tue, Jun 20, 2017 at 6:02 PM, Tom Miller https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>> wrote: > Has anyone been able to get the Packrat sof

Re: [time-nuts] Charles Wenzel GPSDO

Although I've reluctantly bought into the amateur radio "standardization" hype of Power Poles and have a distribution panel with a plethora of them, I basically dislike them. The ones on my Elecraft K3 and K3S pull out frequently when I move the radios and installing them is a PITA. I never h

Re: [time-nuts] KS24019 units PSU requirements

I have the same pair. At 24 volts, they draw a total of about 2 amps at turn-on (both units, total). After they’ve warmed up it drops to a steady 1.1 amps. I bought a Meanwell LRS-100-24 which is capable of 4.5 amps. Very small, runs cool and cost about $25. Rodger > On Jun 21, 2017, at

Re: [time-nuts] Charles Wenzel GPSDO

The monostable is a bit of a kludge. Surely using a shift register to synchronise the PPS to 10MHz (or 1MHz) and comparing (using the same gated integrator arrangement) the synchroniser delay against a fixed pulse width generated by different taps on the same SR would be somewhat more stable? Th

Re: [time-nuts] Charles Wenzel GPSDO

Chuck, It is an analog version of the BROOK SHERA approach from almost 20 years ago. BillWB6BNQ Chuck / Judy Burch wrote: I have been waiting for Charles Wenzel to get around to designing and building a GPSDO. Well, he has done it now and you can see it at

Re: [time-nuts] Charles Wenzel GPSDO

Love the flexibility and the simplicity. You could use about anything. Simple enough to try for fun. Regards Paul WB8TSL On Wed, Jun 21, 2017 at 7:05 PM, Graham wrote: > Very cool. > > I too have a dislike for these coaxial type power connectors for just the > same reason, same goes for mini and

Re: [time-nuts] Charles Wenzel GPSDO

Very cool. I too have a dislike for these coaxial type power connectors for just the same reason, same goes for mini and micro USB and the like. I do use a lot of Power Pole connectors (crimped with a proper crimping tool - not soldered) but in an application like this where there is suffici

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

> Solid earth tides are a BIG factor in precision geodesy. > Gravity offset is a big issue for precision pendulum nuts. > If your pendulum clock cannot detect gravity offsets (very few can) it's not > nutty enough. Mark, There is misunderstanding on this topic so let me clarify. 1) The quasi-pe

Re: [time-nuts] CRT for Tracor 527A

My message to Dan Rea are bouncing, so please forgive the BW: Dan, Hang fire please - I just got this baby hooked up and there's been some creative wire cutting done. The supplies for the CRT have been cut at the trafo. It needs lots of TLC as its not actually working right now - fun ahead. I

Re: [time-nuts] GPS splitter

Hi: I just use a resistor. http://www.prc68.com/I/DAGR.shtml#PS and here is the Cable TV power divider were Type-F DC blocks are added to all but one of the output ports. http://www.prc68.com/I/4GPS.shtml -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012I

Re: [time-nuts] Charles Wenzel GPSDO

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 loose. http://www.prc68.com/I/PowerPole.shtml -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2

Re: [time-nuts] CRT for Tracor 527A

Dave, I have a complete 527A with a slightly screwed up case (someone removed the handles and smoothed the edges!) that was working when I last used it about 6 years ago. The crt at the time was good and working. I had planned to put it on ebay but never got around to it. Email me off list if

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

Hi There are some interesting interactions between liquid (sea) tides and solid tides. Big blobs of water sloshing around in the ocean really close to shore do turn out to have an effect. Not a big deal for those of us wise enough to live well inland :) Probably a lot of fun to plot and validat

Re: [time-nuts] GPS splitter

Hi Hitting the inductance required is relatively easy. Doing so and not hitting self resonance is a bit more tricky. Even a zero ohm reactance likely will work ok (in series with a 150 ohm resistor). It’s tough to know what you have done without a network analyzer. It is even possible that yo

[time-nuts] Plate Tectonics was: GPS Antenna on Tower.

I'm using code from a Fortran program called solid.f that I converted to C using F2C and modified to use more accurate sun / moon positions. The solid.f program is based on an edited version of the dehanttideinelMJD.f source code provided by Professor V. Dehant. This code is an implementation

Re: [time-nuts] GPS splitter

On Wed, 21 Jun 2017 15:03:54 -0400 Bob kb8tq wrote: > The typical answer is: The largest one I could that 1) Would handle the short > circuit current expected and > 2) was self resonant at or above 1.6 GHz. I found out, by experiment, that any "large enough" inductance is ok. A simple "a few do

[time-nuts] Charles Wenzel GPSDO

I have been waiting for Charles Wenzel to get around to designing and building a GPSDO. Well, he has done it now and you can see it at . Any thoughts on the design relative to more conventional ones?? Chuck Burch _

Re: [time-nuts] GPS splitter

HI The typical answer is: The largest one I could that 1) Would handle the short circuit current expected and 2) was self resonant at or above 1.6 GHz. Bob > On Jun 21, 2017, at 2:12 PM, David C. Partridge > wrote: > > Hi Magnus - what sort of inductor value did you use? 68nH or so? > > Da

Re: [time-nuts] KS24019 units PSU requirements

Thanks, I ordered a 24V 120W power brick from eBay. Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Mark Sims Sent: 21 June 2017 16:19 To: time-nuts@febo.com Subject: [time-nuts] KS24019 units PSU requirements I have not measured mine, but I saw

Re: [time-nuts] GPS splitter

Hi Magnus - what sort of inductor value did you use? 68nH or so? Dave -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Magnus Danielson Sent: 17 June 2017 15:12 To: time-nuts@febo.com Cc: mag...@rubidium.se Subject: Re: [time-nuts] GPS splitter Hi, A

[time-nuts] GPScon running on Raspberry Pi 3b

Lady Heather can run under Linux, macOS, FreeBSD, and Windoze. It runs well on the PI (2 or 3) and the soon to be released version 6 has support for the touchscreen and several new devices. I can send anybody interested in testing the new version the latest source code to build. Contact me

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 discipline oscillator vs phase lock

Jim - Your first thread in this post was fascinating to me - stuff I'd never been exposed to. It seems like the 'tricks of the trade' for so much of how things actually get done are so often only accessible to those who work closely with them. I was about to shoot you an email to ask if there wa

[time-nuts] KS24019 units PSU requirements

I have not measured mine, but I saw a spec of 2A max for each side mentioned somewhere (would drop considerably after warmup). I am using a 24V 100W supply that came with my Z3811/Z3812 Lucent boxes. It was already wired up with the proper connectors for the boxes. -- > I h

[time-nuts] KS24019 units PSU requirements

I have a pair of L108 (RFTGm-II-Rb) and L109 (RFTGM-II-XO). What current do these bad boys draw so I don't get too skinny a 24V PSU? Thanks Dave ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailma

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Bruce wrote: If the source impendance at dc is 10k at dc a bias current of a few microamp produces a dc offset of tens of millivolts which may be an issue if the signal amplitude is low and has a low slew rate. Jeez, Bruce, it was nothing but a thought experiment to illustrate why an amplifie

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Your assumptions about my comment are unfounded. It was just intended as an additional reason as to why direct connection to a comparator input isnt a good idea with a high source impedance. The original post asked why a buffer was needed. Bruce > > On 21 June 2017 at 22:14 Charles Stein

Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

Moin, On Tue, 20 Jun 2017 17:11:24 -0400 Charles Steinmetz wrote: > I was going tp post the Smith chart for the input of the AD96885/7 ECL > comparator they use, but was surprised to find that AD did not include > it on the datasheet. However, just from the spec table we can see why a > buff

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

On Tue, 20 Jun 2017 16:34:14 + 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. Cool! How do you calculate the displacement on a fixed position receiver? > The lat/lon offset > is typic