[time-nuts] Spectracom 9183 and leap second

Just wondering if any one is familiar with the Spectracom GPS9183 NTP server? It has a clock on the gui, and on the front panel. What are the chances that either will show the leap second coming up? Also have a thunderbolt. Will that show it? 73 Chris

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

As far as the warm end of the temperature spectrum goes, I have used a Crockpot without the crock and put a thermometer probe inside. when I wanted it to stay at a specific temperature I threw a blanket over it and shut it off. I suspect you could get it to hold temperature better by simply contr

[time-nuts] : Re: Hobbyist grade or homebrew temperature

Also worked for Collins in late 70's in Cedar Rapids. Had to go to the dry ice bin with a few rags, grab a few dry ice cubes, take em back to the aluminum box coolers and beat em down to smaller pieces with a hammer while still wrapped in rags and then drop em in the cooler. We had a lot of rag

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

Hi Rick: I've used two types. 1. Most of the replies have been for controlled air temperature devices. These are by far the most common but also they take a long time to change temperature. 2. Hot/Cold plates are much faster since the DUT is in close contact with the plate. We used these with

Re: [time-nuts] Lucent RFTFm-II-XO

Hi One might *think* a redundant system would work fine with the plug yanked. In this case …. nope. It needs to have a dummy connector on it to get the device running. I agree that this is an “interesting” way to do it. Regardless of that, they did the units need the signals from the other box (

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

It is amazing what is available for 10 - 20 dollars. Some of the LED drivers have a dimming input on the low voltage side. Not sure of the detailed implementation of a din temperature controller with 4-20 mA output, but it might be as simple as tl431 shunt reference and a resistor network to map 4-

Re: [time-nuts] time-nuts Digest, Vol 146, Issue 13

This may help. http://www.auberins.com/index.php?main_page=index&cPath=1 Look at: SYL-1512A (Or any of the others, really...) If you want to lock a temp down and use a light bulb or similar, this is a pretty cheap way to go. I've used them for large soldering irons, reptile incubators, and te

[time-nuts] Z3801A gps week rollover

Happy until the next power glitch... the setting does not seem to persist between boots. There may also be other conditions that causes it to forget your date. And when setting the date, you should disconnect the antenna first, then power on. Once the unit starts tracking satellites you can

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

On 9/5/2016 9:48 PM, Richard (Rick) Karlquist wrote: > As we all know, step #1 in making a clock is NOT > to build a thermometer :-) > > I thought I would check the brain trust here to see > if anyone has seen a hobbyist grade temperature > testing chamber or kit or homebrew design. > Rick Ka

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

Also avoids thermomechanical fatigue failure in the Peltier device. On Wednesday, 7 September 2016 12:14 AM, jimlux wrote: On 9/6/16 1:19 AM, Adrian Godwin wrote: > On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington > wrote: > >> Rick, >> >> I'm going from memory here.  My former business

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

On 9/6/16 1:19 AM, Adrian Godwin wrote: On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington wrote: Rick, I'm going from memory here. My former business partner (now deceased) had a "beer fridge" setup as an environmental chamber for our instruments. The trick for stability was to run the AC comp

Re: [time-nuts] GPS? Antenna

Yes its H-S model, and it must be a GPS antenna... http://www.cafr.ebay.ca/itm/Ericsson-KRE-1012082-1-GPS-Antenna-26dBi-For-HUBER-SUHNER-84097323-/182012930579?hash=item2a60d0ea13:g:MAMAAOSwZd1Vdn6- Regards Karl 2016-09-06 5:12 GMT+02:00 Chris Waldrup : > It's a Huber Suhner. > > Chris > > > On S

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

On Tue, Sep 6, 2016 at 4:24 AM, Bob Darlington wrote: > Rick, > > I'm going from memory here. My former business partner (now deceased) had > a "beer fridge" setup as an environmental chamber for our instruments. The > trick for stability was to run the AC compressor all the time, and push > ag

Re: [time-nuts] Hobbyist grade or homebrew temperature testing chamber?

Constant temperature chambers are not hard to build. I assume you want stability in the range 0.001 to 0.01 degC. I have made a few of these chambers, about 1 cubic feet, out of 3/4 inch particle board, it is not a brilliant insulator, but you want some heat loss. Make a partition at one end with

Re: [time-nuts] Z3801A gps week rollover

I had one that screwed up. I power cycled and set the date. It's happy now. I'm not sure of the exact recipe to tell it the right date. After feeding it a date of roughly today, the status screen jumped to Jan 2007. After it found a few satellites and such, it jumped to Sep 2016. -- The