Re: [time-nuts] 53230A input channel fault?

2014-11-19 Thread Adrian Godwin
I recently got a used 53131A. It had the same problem, even though the BNC connectors are fixed to the front panel. On Wed, Nov 19, 2014 at 2:18 PM, Anders Wallin wrote: A colleague of mine had seen this exact same behavior on another 53230A. The problem is a

Re: [time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

2014-11-29 Thread Adrian Godwin
Is the upgrade similarly easy on a 53131A ? I realise that it needs to have an additional controller pcb but I have one of these counters fitted with option 001. The pcb holding the oscillator has an edge connector that looks suitable for a 10811A, and I have one to hand as well as a couple of

Re: [time-nuts] Upgrade an HP 5342A microwave frequency counter to have an oven oscillator.

2014-11-30 Thread Adrian Godwin
I've seen Gerry's board and might well fit one to another counter. However, this already has a suitable board - in fact, it appears it is an oven, not a tcxo. Presumably just not as good an oven. The point is, it looks ready to receive a 10811A. In fact, consulting the assembly-level service

Re: [time-nuts] Questionable question about the Lucent RFTGs

2014-12-05 Thread Adrian Godwin
Do any have the 68332 ? That's got the TPU - Time Processing Unit. Pretty good at multiple time domains or, in their frequent job as engine controllers, mixed time/crank angle domains. On Fri, Dec 5, 2014 at 9:17 PM, Gerhard Hoffmann wrote: Am 05.12.2014 um 21:20 schrieb Hal

[time-nuts] (UK) FS: HP Agilent 53131A

2014-12-16 Thread Adrian Godwin
Due to a bulk purchase, I have two used 53131A counters to sell. Preferably a UK buyer, looking for about £200 + postage. Standard reference (not medium or high stability), calibration expired. Please contact me off-list for full details. -adrian ___

Re: [time-nuts] HP 53131A - reset security code

2014-12-23 Thread Adrian Godwin
I'm the seller. The counters, as a matter of interest, came from the factory that Rakon recently closed in Lincoln. Unfortunately there wasn't any contact with the actual staff so I have no information about them. I bought 3, kept one for myself - the only one with the MS option. I haven't tried

Re: [time-nuts] 510 doubler and old Toko RF catalogue (Cirkit2nd ed. 1994)

2015-01-28 Thread Adrian Godwin
I think another spinoff from Cirkit was Mainline Electronics of Leicester. They also mostly disappeared (though I have wondered if they still trade as the ebay seller anonalouise, who seems to have similar stock). Mainline Electronics seems to exist as a Russian website, and it looks as though

Re: [time-nuts] Motorola Oncore UT+ firmware upgrade backup power questions

2015-03-16 Thread Adrian Godwin
Seiko and some other manufacturers used Supercaps for a while in their Kinetic watches. Electrically they're fine, but they turned out to have a shorter life than rechargeable batteries. They even replaced capacitors with lithium rechargeables when servicing the older models. In a backup

Re: [time-nuts] Obscure HP T/F instruments in

2015-03-19 Thread Adrian Godwin
Thanks for the heads-up. Postage to the UK isn't quite so bad, and he accepted a lower offer .. The list of other items is well worth a scan, too. I don't have a reference setup working yet but if there's anyone near Bedfordshire, UK that would like to do an ADEV plot (just for fun, I'm not

Re: [time-nuts] Obscure HP T/F instruments in

2015-03-20 Thread Adrian Godwin
This stuff is lovely, but it's enthusiast's equipment, not public or commercial museums. There's a great computer museum in Paderborn, Germany - it's owned by the founder of an ATM company. I love that it has, in Germany, a really good exhibit about Bletchley Park. There's a pinball machine

Re: [time-nuts] Lady Heather

2015-03-13 Thread Adrian Godwin
The ttyS* devices should be owned by root and be in the dialout group, eg crw-rw---T 1 root dialout 4, 64 Feb 28 08:31 /dev/ttyS0 crw-rw---T 1 root dialout 4, 65 Feb 28 08:31 /dev/ttyS1 crw-rw---T 1 root dialout 4, 66 Feb 28 08:31 /dev/ttyS2 crw-rw---T 1 root dialout 4, 67 Feb 28 08:31 /dev/ttyS3

Re: [time-nuts] Obscure HP T/F instruments in

2015-03-25 Thread Adrian Godwin
The HP101A and 5275A arrived today. The 101A warmed up in about an hour and the crystal temp settled. It's now reading 98.50 against my 53131A (med. stability option but uncalibrated). I'm not sure what the spec is, or how long ago it was tuned - but even if it was set recently, it's still

Re: [time-nuts] Another Philipe Patek clock

2015-03-31 Thread Adrian Godwin
There have been large numbers of master clocks in the broadcasting house clearance auctions over the last year. As a result there are probably quite a lot in circulation in the UK right now, though the BBC cachet put the prices above dirt-cheap. The studio slave clocks were particularly popular.

Re: [time-nuts] A Open Source GPIB project

2015-04-26 Thread Adrian Godwin
Looks to be Protel aka Altium for the schematics / pcb. On Sun, Apr 26, 2015 at 2:42 PM, Bob Camp wrote: Hi After poking around a bit, more questions that comments. 1) It looks pretty cool. 2) Any idea of what the tool chain was that generated the files? (I probably need

Re: [time-nuts] EMI and CE certification

2015-05-11 Thread Adrian Godwin
Is it driven as an inductive loop? That might put it under different regulations. On 11 May 2015 17:47, Chuck Harris wrote: Yes, but in the case of the lawnmower fence, and the invisible dog fence, the transmitter drives the fence as an antenna. In the US, the antenna

Re: [time-nuts] Ultra High Stability Time Base Options for 53132A

2015-04-12 Thread Adrian Godwin
What caused that degradation ? I'm interested in dos/don'ts for best use of a 10811. On Sat, Apr 11, 2015 at 11:32 PM, Richard (Rick) Karlquist wrote: On 4/11/2015 5:01 AM, J. L. Trantham wrote: Unless the design has been changed, the 10811 option for the 53132 has

Re: [time-nuts] Thunderbolt power connector crimper

2015-06-08 Thread Adrian Godwin
The PA-09 crimp tool will do a lot of smaller crimps, even the small JST sizes. There's also a bigger one available. On Mon, Jun 8, 2015 at 12:53 PM, George Dubovsky

Re: [time-nuts] magnetic electronic components

2015-06-22 Thread Adrian Godwin
Although it's published by a vendor, this applications manual has a lot of useful information. I was sufficiently impressed when I saw it at a trade show that I bought a copy, and they've reduce the price

Re: [time-nuts] Small time server for mobile use.

2015-05-25 Thread Adrian Godwin
I hesitate to say this for fear of provoking a fault, but although I wouldn't consider them especially good, they're not universal failures. I have a Pi running a house control and logging system that has an uptime of 230 days despite being largely unattended (I'm not on site - it doesn't get any

Re: [time-nuts] KS-24361 REF-0 standalone

2015-08-11 Thread Adrian Godwin
These seem a good deal but the shipping price to the UK puts me off a bit - it's 3 x the price of the unit. I've looked into shipping a number of them to get a better rate and it seems worthwhile. I'm happy to sell them on to time-nuts at cost (will include shipping and duty) and ebay the

Re: [time-nuts] wtd: WWVB info...

2015-08-08 Thread Adrian Godwin
I have a very similar looking Junghams clock bought in the UK about 20 years ago (though it doesn't have that time zone graphic). It works off the UK MSF standard : still in daily use, though it doesn't sync quite so well since the transmitter moved to Cumbria (I'm quite close to the old site,

Re: [time-nuts] wtd: WWVB info

2015-08-11 Thread Adrian Godwin
The difficult thing about that is that making the wifi connection without any user interface is difficult now that most wifi connections have security enabled. On Tue, Aug 11, 2015 at 8:14 AM, Chris Albertson wrote: You might look into GPS devices. They aren't quite

Re: [time-nuts] KS-24361 REF-0 standalone

2015-08-11 Thread Adrian Godwin
of them not making the trip over the ocean in fine shape. Once they get there, you should be able to re-label the original boxes and mail them out. Certainly not a “no hassle” deal, but pretty simple as these things go. Bob On Aug 11, 2015, at 4:15 PM, Adrian Godwin

Re: [time-nuts] How did they distribute time in the old days?

2015-10-16 Thread Adrian Godwin
I have a synchronome clock built for the British Post Office. I find that the 10V or so that a USB to serial adapter can produce can trigger the solenoid, if allowed to charge a capacitor for the intervening minute. The effect is that I can print a single character once a minute at a low bit rate

Re: [time-nuts] KS-24361 REF-0 standalone

2015-08-31 Thread Adrian Godwin
Thanks for doing these write-ups. I've bought several units from the US supplier with the intention of getting shipping down to a sensible level, and have a lash-up based on your article which has had all the first few running. They won't lock to anything far off 1pps so need a properly working

Re: [time-nuts] New Symmetricom 58532A antennas - Launch3

2015-10-02 Thread Adrian Godwin
There's a drawing on the spec sheet. It's just a bit of 1 5/8 tube. Try a local aerial fitter. On Fri, Oct 2, 2015 at 2:01 PM, Steve wrote: > The Symmetricom data sheet mentions the Option AUB antenna mast. What is > that? I don't find details of it. How does you mount

Re: [time-nuts] New Symmetricom 58532A antennas - Launch3

2015-10-02 Thread Adrian Godwin
I shipped a bunch of ref-0 units to the UK. Saved a huge amount of shipping by buying a lot. It might not be much more expensive to ship 10 than 1. There are still a couple of patient folk on this list waiting for me to ship them on (or maybe they've given up waiting for me to be less busy).

Re: [time-nuts] Tait reference

2016-01-12 Thread Adrian Godwin
If so, let's hope the sudden surge of purchases will encourage the dealer to find some more :) On Tue, Jan 12, 2016 at 1:39 PM, Clint Jay wrote: > That's a very happy coincidence and one I'd hoped to hear. > > The pictures in the auction seem to show a lack of tarnish on

Re: [time-nuts] Tait reference

2016-01-11 Thread Adrian Godwin
Yes, i found that description and it put me off buying one. But there are also references on the web (including time-nuts archive) to surplus T801s with rubidium sources. Anyway, I took a punt and bought one. So I'll find out soon :). On Mon, Jan 11, 2016 at 11:18 AM, Charles Steinmetz

[time-nuts] Tait reference

2016-01-10 Thread Adrian Godwin
Are these the references with a rubidium oscillator ? They seem to have similar models with OCXOs etc. ___ time-nuts mailing list -- To unsubscribe, go to

Re: [time-nuts] Generating a solid PPS from 10Mhz source

2016-01-15 Thread Adrian Godwin
Why use a board full of TTL when an $1 8-pin chip will do it ? On Thu, Jan 14, 2016 at 11:44 PM, Morris Odell wrote: > Am I missing something here? > > I understand the ease and fun of programming up an AVR as much as anyone > but surely this task could be accomplished

Re: [time-nuts] Tait reference

2016-01-13 Thread Adrian Godwin
issue. I may just rewire those outputs as a distribution amplifier in any case. On Tue, Jan 12, 2016 at 5:46 PM, Adrian Godwin <> wrote: > If so, let's hope the sudden surge of purchases will encourage the dealer > to find some more :) > > > On Tue, Jan 12, 2

Re: [time-nuts] Timelab, two SR620s and losing samples

2016-01-18 Thread Adrian Godwin
If you have RS232 connections, won't you have one for each device ? Whereas with GPIB, you'll (probably) only have one bus. The GPIB bus will arbitrate and avoid both instruments talking at the same time (this might not be true in talk-only mode since there's no target address involved) but it

Re: [time-nuts] Generating a solid PPS from 10Mhz source

2016-01-18 Thread Adrian Godwin
You might have come across the Raspberry Pi story : one of the revised versions had a SMPS control chip that was intended to be buried inside a phone, not exposed on an open pcb. On Mon, Jan 18, 2016 at 3:11 PM, Bob Camp

Re: [time-nuts] OT stuffing boards: was GPS interface/prototyping board

2016-06-24 Thread Adrian Godwin
On Fri, Jun 24, 2016 at 3:32 PM, Attila Kinali wrote: > > The trick is to use semi-manual pick machines for low volumes. > Ie machines that you do not program, but guide by hand. This allows > faster and more accurate placing of components than would be possible > with a pure

Re: [time-nuts] pick and place problems/design (was: OT stuffing boards)

2016-06-25 Thread Adrian Godwin
Many parts can't be recognised visually. Capacitors are the obvious example. On Sat, Jun 25, 2016 at 6:11 AM, Chris Albertson wrote: > The ideal hobby use pick and place machine would be very different > from a commercial machine. Lets say I want one board made.

Re: [time-nuts] HP Z3801A Internal Power Supply issues

2016-01-31 Thread Adrian Godwin
A tant melted on one of my KS-246361 boxes (I guess they're a similar age, possibly even the same source). The only one so far to have trouble. It failed in such a way that it continued to smoke and load up the power supply, The current drawn from the no-name laptop power supply was still well

Re: [time-nuts] Inside a CTS 1960017 OCXO

2016-02-28 Thread Adrian Godwin
Could it be microphonic capacitors, or the crystal itself ? Have you got a big old heavy power supply with a buzzing transformer on your workbench ? On Sun, Feb 28, 2016 at 3:04 PM, Daniel Watson wrote: > Hi, > > I put one in a freezer and measured the current draw. At

Re: [time-nuts] Lady Heather Server On Raspberry Pi 2 Model B?

2016-02-28 Thread Adrian Godwin
This turned out to be an easy way to run Lady Heather itself (herself ?) on Linux - it works well under Wine, but identifying the serial port is a problem. But run Heather with '/ip=localhost' and ser2net to connect to the USB serial port and all is smooth. I used the ser2net config line

Re: [time-nuts] HP Reliability

2016-02-14 Thread Adrian Godwin
HP built their reputation for quality and reliability with test equipment. Computers were always considered a bit weird (in a nice way, in the case of handheld calculators) but printers have followed the consumer race to the bottom. It's sad to hear that the instrument division are no longer

Re: [time-nuts] MTI 260-0624-D OCXO

2016-02-18 Thread Adrian Godwin
I have a small collection of 10811 and similar oscillators here, collected from hamfests rather than china (and mostly pre-ebay). What sort of testing regime would you put them through ? I don't have anything as exotic as a timepod but I do have an HP53131A, the Tait Rb source, and a KS-24361 set

Re: [time-nuts] Conditioning Rubidium Oscillators

2016-03-15 Thread Adrian Godwin
My understanding of the article was that although fairly simple control techniques such as PID were used, their innovation was to determine what function the loop was performing, (initial lock, stability, and transition from one to the other) and to choose a set of constants for loop control

[time-nuts] NPL open day

2016-05-15 Thread Adrian Godwin
In case anyone's in London this week, the NPL have an open day : ___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions

Re: [time-nuts] help

2016-05-03 Thread Adrian Godwin
Since you have an impulse clock system, you could use that to fire the bell - you could modify a slave clock or use one of these : or possibly this one : The first seems rather expensive to me, I've more commonly

Re: [time-nuts] help

2016-05-02 Thread Adrian Godwin
They're a LED and some current limiting. Some are specced as low as 3V and 10mA but they're optimised for 12-24. I'd definitely use a transistor and at least 5V, especially from something like a Pi or Teensy, which have 3v3 logic levels. My reading is that Bill doesn't want to mess around with

Re: [time-nuts] help

2016-05-02 Thread Adrian Godwin
/webcontrol/EZ-21g.html On Mon, May 2, 2016 at 7:21 PM, Adrian Godwin <> wrote: > They're a LED and some current limiting. Some are specced as low as 3V and > 10mA but they're optimised for 12-24. I'd definitely use a transistor and > at least 5V, especially from some

Re: [time-nuts] What is "accuracy"? (newbie timenut, hi folks!)

2016-05-06 Thread Adrian Godwin
With regard to the data sheet, all the specified errors have to be added to get the worst case (though they may not all operate in the same direction). So you have the initial accuracy at delivery, + a term related to age, + a term related to temperature and any other factors that are specified.

Re: [time-nuts] KS-24361 rom

2016-04-16 Thread Adrian Godwin
ite: > > > > /tvb > > > - Original Message - > From: "Adrian Godwin" <> > To: "Discussion of precise time and frequency measurement" < >> > Sent: Friday, Ap

[time-nuts] KS-24361 rom

2016-04-16 Thread Adrian Godwin
I've dumped out the KS24361 ROM using the built-in Forth interpreter as a move towards reverse-engineering it. Is there somewhere I can put this for easy access ? I imagine it's copyright HP and although I doubt they'll care, I don't want to cause any problems. -adrian

Re: [time-nuts] [LEAPSECS] Leap second to be introduced at midnight UTC December 31 this year

2016-07-21 Thread Adrian Godwin
I was inclined to agree, cynically reasoning that many implementations would argue that the leapseconds would average out in most applications and they could ignore them. But actually, it would be good for programmers to properly separate the concepts of elapsed time and clock-time. If elapsed

Re: [time-nuts] Working with SMT parts.

2016-08-13 Thread Adrian Godwin
I use a beautiful Wild M3Z that I got at a good price from a British Aerospace auction. It does have the disadvantage that there's a very exact spot to place your eyes, but the image is superb. I typically start at the bottom end (6.5 x 10 x 0.5) but often use the other zoom levels (up to 40 x 10

Re: [time-nuts] Heathkit clock available

2016-08-11 Thread Adrian Godwin
On Thu, Aug 11, 2016 at 4:03 AM, Chris Albertson wrote: > Digital clocks are just not the amazing technical wonders they once > were. > > No, but it's interesting that they've considered the interface rather than using the common one supported by generic clock chips.

Re: [time-nuts] OT stuffing boards: was GPS interface/prototyping board

2016-06-27 Thread Adrian Godwin
On Sat, Jun 25, 2016 at 9:26 AM, Steve Wiseman wrote: > > There are mailing lists for this stuff, chaps - openpnp, firepick, > versatronics, plenty of others. All full of people finding out that, > like everything, it's trickier than you first think. See you over > there,

Re: [time-nuts] Power Problems Lucent KS-24361, L101 & L102

2017-02-05 Thread Adrian Godwin
There's a surface-mount fuse on the back of the board. But pin 3 seems to show no leakage to other pins. I'd be surprised if connecting it has caused any damage. Have you tried reconnecting it correctly ? On Sun, Feb 5, 2017 at 3:53 PM, Bob Camp wrote: > Hi > > The power

Re: [time-nuts] Li-ion Battreries

2017-01-22 Thread Adrian Godwin
Recovered cells aren't only sold through ebay parts adverts - they're also used for production. I recently bought a few cell phone boosters which consist of an 18650, a charge circuit and a voltage booster to 5V. They were low cost and nicely made with an extruded aluminium case and they worked

Re: [time-nuts] Anybody want a Thunderbolt power supply?

2016-08-31 Thread Adrian Godwin
I'm being Devil's Advocate here because I certainly realise switchers do generate high frequency noise. But wasn't the intention of them to make filtering easier, with smaller filter components, exactly because they operate at higher frequencies ? So why do they fail ? Is it cost-cutting to make

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

2016-09-06 Thread Adrian Godwin
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

Re: [time-nuts] Measure GPSDO stability with minimum resources?

2016-10-07 Thread Adrian Godwin
Recently, I dumped the ROM from a ks24361. I imagine it's the same or very similar code. Are there notes published somewhere ? It would be useful to compare them. On 7 Oct 2016 7:52 p.m., "Magnus Danielson" wrote: > Hi Tom, > > On 10/07/2016 06:02 PM, Tom Van Baak

Re: [time-nuts] Measure GPSDO stability with minimum resources?

2016-10-08 Thread Adrian Godwin
here is no more published notes > as far as I know. I can see what of my project is easy to share though. > > Is the images uploaded somewhere? > > Cheers, > Magnus > > > On 10/07/2016 10:06 PM, Adrian Godwin wrote: > >> Recently, I dumped the ROM from a ks243

Re: [time-nuts] Opening an Isotemp OCXO

2016-10-28 Thread Adrian Godwin
The data sheet for the device only mentions 12V. Other data sheets (eg the 131) mention 5V and 12V, but don't indicate how to specify one or the other. Gerry Sweeny's article at mentions a part number suffix that

Re: [time-nuts] Opening an Isotemp OCXO

2016-10-28 Thread Adrian Godwin
That's one sweet soldering iron. Is it an American Beauty ? On Fri, Oct 28, 2016 at 4:31 PM, Peter Reilley wrote: > I did finally get it open. I used a very large old style soldering > iron and .003 inch steel shim stock. I would melt the solder on the > straight

Re: [time-nuts] HP 5275A

2016-11-08 Thread Adrian Godwin
ut some pix of a 9815 calc. That would be pretty neat. >> On really old stuff if you can't find the part needed its pretty easy to >> replace the whole function with modern answers. I know it sort of breaks >> the original mode but for me at least its a case of getting it going.

Re: [time-nuts] I love the smell of tantalum in the morning

2016-11-06 Thread Adrian Godwin
You might also want normal cold tweezers to place the part. I'm not sure what an orange stick is, around here I'd use a wooden toothpick. Perhaps that's the same thing ! The Swiss Venus tweezers have a lovely finish and the ends always meet. There are probably others as good. If you get some

Re: [time-nuts] Time nut soon to be in Shenzhen

2016-11-06 Thread Adrian Godwin
Ref. the thread about burning tantalum capacitors .. If I were going to china I'd be looking at the tools. Many might be low quality (but cheaper than ebay). Others might be excellent. You need to see them to find out. On Sun, Nov 6, 2016 at 4:33 PM, Azelio Boriani

Re: [time-nuts] I love the smell of tantalum in the morning

2016-11-06 Thread Adrian Godwin
SMD parts aren't going to go away. It's worth investing in good tools to deal with them and learning the best way to use them. I'd put tweezers quite high on that list, and although the metcals are worthwhile if you can avoid full price, the chinese tweezers are surprisingly useful at very low

Re: [time-nuts] I love the smell of tantalum in the morning

2016-11-06 Thread Adrian Godwin
urchasing soldering tweezers without trying them > first. They are not easy to control solder application when mounting a > component. > > I do really like the Weller rt7 knife tip. > > On Sunday, 6 November 2016, Adrian Godwin <> wrote: > > > SMD

[time-nuts] HP 5275A

2016-11-06 Thread Adrian Godwin
Slightly off-topic, as this is a general repair question. But it's a TIC. I'm repairing a 5275A timer (all-discreet count logic to 100MHz, neon bulb display, a most amazing bcd to decimal decoder made from neons and LDRs, 1-2-2-4 decade counters ..) and the current problem is a 2n1038-2 germanium

Re: [time-nuts] HP 5275A

2016-11-06 Thread Adrian Godwin
How about some pix of a 9815 calc. That would be pretty neat. >> On really old stuff if you can't find the part needed its pretty easy to >> replace the whole function with modern answers. I know it sort of breaks >> the original mode but for me at least its a case of getting it

Re: [time-nuts] 5071A with ATTENTION flashing

2016-11-09 Thread Adrian Godwin
I'm still struggling to get the acrylic I need. I've been into London a few times but not been able to get to the shop in business hours. Guess I could order online if necessary but it will cost a fair bit more. On Wed, Nov 9, 2016 at 3:19 PM, paul swed wrote: > I saw the

Re: [time-nuts] 5071A with ATTENTION flashing

2016-11-09 Thread Adrian Godwin
Yes, I'm sorry about that. On Wed, Nov 9, 2016 at 5:18 PM, paul swed <> wrote: > Adrian > I think you may have responded to the wrong thread?? > Regards > Paul > > On Wed, Nov 9, 2016 at 10:21 AM, Adrian Godwin <> > wrote:

Re: [time-nuts] How to get PPS from ublox mini-PCI GPS to APU2 SoC serial port for ntpd

2016-11-09 Thread Adrian Godwin
But trailing isn't the same as falling. The leading edge can be of either polarity. On Wed, Nov 9, 2016 at 11:28 PM, Bob Stewart wrote: > Tom, > How many times have people posted here, on time-nuts, not to trust the > trailing edge of a 1PPS pulse? > > Bob

Re: [time-nuts] China Oscillator Alternative

2016-11-10 Thread Adrian Godwin
I looked at this when it was mentioned here a few weeks ago. I did the procedure in an hour or so and it's working well, keeping the PPS within 50ns of GPS with 6-8 satellites. Monitored by the patched version of Z38XX at the moment though I look forward to putting Lady Heather on the job. The

Re: [time-nuts] I love the smell of tantalum in the morning

2016-11-05 Thread Adrian Godwin
Metcal /OKI might be that other brand. I'd certainly recommend them, but the tweezers are not as fast to heat as the single tip devices. I've had little success personally with the hot air devices. I seem to toast the board before I melt the solder, and when it does melt it's not limited to one

Re: [time-nuts] Linux PPS clues?

2016-10-21 Thread Adrian Godwin
What is the circuit driving that signal ? It appears to have too little positive drive to overcome the capacitance. Perhaps it's an open collector with too large a pull-up ? On 21 Oct 2016 12:23 a.m., "Ilia Platone" wrote: > sorry, no attachment, this mail contains two

Re: [time-nuts] PC clock generator without 14.318MHz

2016-10-18 Thread Adrian Godwin
How about the Apollo launches ? On Wed, Oct 19, 2016 at 12:40 AM, jimlux wrote: > On 10/18/16 4:25 PM, Magnus Danielson wrote: > >> Jim, >> >> On 10/19/2016 12:51 AM, jimlux wrote: >> >>> On 10/18/16 2:30 PM, Tom Van Baak wrote: >>> Hi Vladimir, Some of

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

2016-11-26 Thread Adrian Godwin
I bought some old crystals on ebay : Is anyone familiar with this style ? I don't think the quartz is visible in the glass section : I imagine that's just an insulator. I think the quartz is under a brass disc, with a sping to hold the disc down visible

Re: [time-nuts] 53132 replacement fan

2016-11-21 Thread Adrian Godwin
This one's pretty quiet. But the airflow is a bit lower. On Mon, Nov 21, 2016 at 5:57 PM, jimlux wrote: > On

Re: [time-nuts] Vintage Quartz Crystal Manufacturing

2016-11-26 Thread Adrian Godwin
ion are about right for that sort of thing. Swap one > in and the > transmit frequency changes. Number 7 for 80 KHz. Number 8 for 85 KHz. > Number 7 for > 75 KHz. Just a guess … > > Bob > > > > > On Nov 26, 2016, at 7:40 AM, Adrian Godwin <>

Re: [time-nuts] precision timing pulse

2016-11-17 Thread Adrian Godwin
Tom describes the PIC as a 'poor man's FPGA'. And I'm aware of how they're programmed - I agree they're a good choice for this sort of device. However, even poor men can use FPGAs now. I'm following with interest the open-source toolchain available for the Lattice ice40,

Re: [time-nuts] TCXO drift - related to TVB's posting

2016-11-12 Thread Adrian Godwin
What if your shop reference were drifting up ? On Sat, Nov 12, 2016 at 11:25 PM, Joseph Gray wrote: > TCXO, not OCXO, but related. Sorry, but I have no graphs. > > I work for a municipal radio shop. We service radios that span 20 > years (through acquisitions, it was GE,

Re: [time-nuts] KSC big clock

2016-10-21 Thread Adrian Godwin
Wow .. 24kW for a clock display ! On Fri, Oct 21, 2016 at 6:56 AM, Todd Caldwell wrote: > Hi All, > > I've been lurking and assembling gear for the most part, so this is my > first post I think. > > I was at KSC in May of 2010 for the launch of STS-132. Attached is a

Re: [time-nuts] Opening an Isotemp OCXO

2016-10-28 Thread Adrian Godwin
The 1k resistor doesn't seem to feed the 'S30'. It looks as though pin 14 (Vcc) goes via that thick track to the +12 input. On Fri, Oct 28, 2016 at 5:46 PM, jimlux wrote: > On 10/28/16 8:31 AM, Peter Reilley wrote: > > Looking around with my scope it seems that the output

Re: [time-nuts] TimeLab

2016-10-09 Thread Adrian Godwin
On Sun, Oct 9, 2016 at 9:07 PM, Tom Van Baak wrote: > 3) The problems you are running into get far worse the less accurate and > less stable the sources are (such as mains, mechanical, vintage quartz, and > pendulum clocks). So that's why I developed the picPET time-stamping

Re: [time-nuts] For those that insist on using switching power supplies

2016-10-14 Thread Adrian Godwin
I would add a DC blocker for the input to the spectrum analyser. On Fri, Oct 14, 2016 at 7:59 PM, Hal Murray wrote: > > said: > >> Nick, thanks for your detailed reply. Would you happen to have a photo > of > >> the "spring looking things?" I am

Re: [time-nuts] Lady Heather Version 5 is now available

2016-12-10 Thread Adrian Godwin
Now running for me on Linux twice : one with a KS24361 and the other with a Res-T (rx only). Thanks ! On Sat, Dec 10, 2016 at 7:09 PM, Bob Camp wrote: > Hi > > Well there goes the neighborhood :) … > > It used to be that the absolutely terrific Lady Heather only worked on >

Re: [time-nuts] RPi/ beagle bone-like computer without video

2016-11-30 Thread Adrian Godwin
The tiny g3 routers are worth looking at. They have WiFi, Ethernet and USB, cost very little and will usually run wrt54g Linux. Can be rather short on memory though. On 30 Nov 2016 8:43 p.m., "jimlux" wrote: > I'm looking for a small linux single board - similar to RPi or

Re: [time-nuts] Switching regulator replacement for 7805

2016-12-04 Thread Adrian Godwin
Thanks for this. I've seen something similar from Murata : Since they're a mainstream supplier of inductors they may have managed better performance - it would be interesting to compare.

Re: [time-nuts] Switching regulator replacement for 7805

2016-12-04 Thread Adrian Godwin
ermann N8UR wrote: > >> Thanks for that pointer! When I searched Digikey, I wasn't able to find >> anything that was in the 3-lead TO-220 case. I will definitely check >> out the Murata units, as I suspect they perform better than this one. >> >> John >> >> On

Re: [time-nuts] Temperature (environmental) sensors

2017-01-03 Thread Adrian Godwin
All these (including the one I linked) seem to be 0.5C only. This one gets to 0.2C : On Tue, Jan 3, 2017 at 4:09 PM, Paul Alfille wrote: > If you don't mind using 1-wire sensors, there are many nice choices, like: > >

Re: [time-nuts] Temperature (environmental) sensors

2017-01-03 Thread Adrian Godwin
I haven't used this current generation of loggers (I do have a couple of older RS232 units) but there's quite a range at On Tue, Jan 3, 2017 at 3:08 PM, Tom Van Baak wrote: > I have some high-end temperature and

Re: [time-nuts] Anyone (ideally in the UK) got a spare rotary knob for the 5370B TI counter?

2016-12-31 Thread Adrian Godwin
David, You're a volt-nut too, aren't you ? Maybe motorise the variac and keep your lab at 240V +/- almost-nothing ? On Sat, Dec 31, 2016 at 7:57 PM, Tom Miller wrote: > > - Original Message - From: "Dr. David Kirkby (Kirkby Microwave > Ltd)"

Re: [time-nuts] Version 5 wrong leap second

2016-12-31 Thread Adrian Godwin
I had LH on a ks24361. I think it displayed :00 for 2 seconds (my attempt to record it failed). The autocapture (attached) was a little too early. I guess this is because LH is polling the receiver every second and the actual content depends on what the receiver replies and when it does it ? I

[time-nuts] new year crashes

2017-01-01 Thread Adrian Godwin
I wonder if someone wasn't ready for their extra second : ___ time-nuts mailing list -- To unsubscribe, go to and follow the instructions

Re: [time-nuts] Leap Second Smear Monitoring

2017-01-01 Thread Adrian Godwin
What's the best way to get a test stream for leap seconds? Would it be feasible to have a small set of NTP servers that insert a leap second every other day and remove it alternately? On 31 Dec 2016 8:41 p.m., "Magnus Danielson" wrote: > Hi, > > Thought I just

Re: [time-nuts] Temperature (environmental) sensors

2017-01-03 Thread Adrian Godwin
The sensor Jim linked : Temp/humidity with I2C interface looks good - packaged, high res temperature, etc. It's not 'complete' in that it's only a sensor, but you only have to attach a USB-I2C adapter. Probably less work than connecting up the sparkfun

[time-nuts] LH on X

2016-12-26 Thread Adrian Godwin
It seems LH has the ability to zoom a given display to full window size by clicking on it, and it will revert to multiple section by clicking on an unused area of the display. It's a nice feature, but it seems to get confused if the LH window is open on an alternate screen (with a screenswitcher,

Re: [time-nuts] HP53132A Firmware Version 4613

2016-12-27 Thread Adrian Godwin
How similar are the 131A and the 132A ? Is it possible to upgrade a 131 into 132 ? On Tue, Dec 27, 2016 at 8:37 PM, GandalfG8--- via time-nuts <> wrote: > I have just uploaded this firmware to Didier's (KO4BB) manuals site so it > should be available for download in the

Re: [time-nuts] Re. Interesting experiments with SDR

2017-04-10 Thread Adrian Godwin
Assuming you're in the channel islands, you should be able to pick up BBC radio 4 long wave on 198kHz, if your SDR can handle frequencies that low. It's referenced to a rubidium standard and checked by NPL. It can also be used to discipline a reference, or compared with some other local standard

Re: [time-nuts] HP 105D FS

2017-04-09 Thread Adrian Godwin
There doesn't seem to be a 100D at Seems like that needs fixing :) On Sun, Apr 9, 2017 at 1:43 PM, wrote: > From the description, it sounds like a HP 100D not a 10D. > > John WA4WDL > > Perry Sandeen via time-nuts

Re: [time-nuts] TAPR TICC boxed (input protection)

2017-04-08 Thread Adrian Godwin
The Siliconix PAD1 at 1pA and 0.8pF is still available : On Sat, Apr 8, 2017 at 4:52 PM, David wrote: > On Thu, 6 Apr 2017 22:23:43 -0400, you wrote: > > >David wrote: > > > >> I know one thing to watch out for if you are

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