Re: [time-nuts] Lady Heather BST command line question
Hello,
Thank you Mark, I had not put the zero in front of /GMT/BST and it
obviously needed that as it's now working fine, many thanks for the
great software!
on 01/04/2018 08:51 you wrote:
> Ooops, that should have been /b=2 to select the European time zone rule!
> ___
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Chris Wilson.
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[time-nuts] Lady Heather BST command line question
01/04/2018 06:10 I am struggling to make LH show the time in British Summer Time. I can get it to show UTC, but not with the BST offfset. Could someone please give me the exact start up command line to add to the Windows properties box please? Will it then automatically revert to GMT at the end of the BST offset? Thanks! -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] Does a frequency counter locked to GPS need to "warm up"?
08/02/2018 07:31 Does a frequency counter connected to a permanently running (Trimble Thunderbolt) GPS disciplined frequency standard need to warm up after switch on before readings settle? Just curious, thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] trimble Thunderbolt, how to get 25 or 27 mHz from it??
Hello Bruce, Sorry, this went to you direct as well, in error. Thanks for the very fast reply! Would it be possible to use one of these frequency multiplier IC's? Sounds simpler, but maybe there are down sides? http://uk.farnell.com/on-semiconductor/nb3n502dg/pll-clock-multiplier-8soic/dp/2101849 on 08/01/2018 13:11 you wrote: > Divide the 10MHz by 2 and use a filter to extract the fifth > harmonic from the 5MHz square wave output. > Amplify the 25MHz output from the filter if required... > Bruce > On 09 January 2018 at 00:31 Chris Wilson <ch...@chriswilson.tv> wrote: > 08/01/2018 11:28 > Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt > as a reference clock at 1v P to P square wave for a Si5351a > synthesizer chip please? I have the David Partridge divider board from > way back that is still going strong, but 25 MHz is not an option as it > divides only. Thanks, please keep replies to the level an idiot might > comprehend :) > -- > Best Regards, > Chris Wilson. > mailto: ch...@chriswilson.tv -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] trimble Thunderbolt, how to get 25 or 27 mHz from it??
08/01/2018 11:28 Is there an easy way to get 25 or 27 MHz from my Trimble Thunderbolt as a reference clock at 1v P to P square wave for a Si5351a synthesizer chip please? I have the David Partridge divider board from way back that is still going strong, but 25 MHz is not an option as it divides only. Thanks, please keep replies to the level an idiot might comprehend :) -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
Hello time-nuts folk, Thanks for all the replies, I see now that it is nothing to concern myself with, and my curiosity is satisfied, much appreciated, you are true time experts! :) Good to see Lady Heather continues to be updated, thanks Mark. on 12/10/2017 12:36 you wrote: > Lady Heather's screen clock ticks when the time message comes in > (which can be offset from the actual time in the message). Heather > applies a receiver type dependent adjustment to the time in the > message and then displays the time. If you enable the digital > millisecond clock you will see that the clock does not necessarily tick at > hh:mm:ss.000 > The next release of Heather has an audible tick clock mode where it > ticks at hh:mm:ss.000 This can be used to set your watch more accurately, > etc. > > ___ > 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. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
Hello,
According to that clock LH is lagging about 0.5 seconds behind... PC
time matches it exactly, as close as the eye can tell. Thanks for the
replies.
on 11/10/2017 17:11 you wrote:
> For those who are in Europe there is the PTB (Physikalisch-Technische
> Bundesanstalt, the German Federal institute of Physics and Technology)
> service to check the PC's time:
> <https://uhr.ptb.de/>
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Chris Wilson.
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[time-nuts] NTP linked PC clock is slightly ahead of Lady Heather GPS time
11/10/2017 12:24 Probably a simple answer, but I am curious as to why my PC clock which is set by NTP on Windows 7 64 bit OS is ahead of Lady Heather's time, locked to a Trimble Thunderbolt by about half a second (guesstimate..) I caught a screen shot of the discrepancy just now, it's at http://www.gatesgarth.com/time.jpg I use NTP for low signal WSPR transmissions and a second out isn't the end of the world, if indeed something IS out. More academic than problematic, thanks -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Can Lady Heather set PC time directly from a TrimbleThunderbolt?
Hello, on 04/08/2017 15:36 you wrote: > Answer to second question: For GMT time display set the time zone > name to GMT with a time zone offset of 0. (TZ keyboard command TZ > GMT, command line option /tx=GMT). > First question: Yes Heather can set your system clock (assuming > the program has access privileges to the change the clock. Check > out the TS keyboard command or /ts? command line options. The > clock setting routine is rather rude and crude. It just jams the > system clock with the receiver time on a once per minute/hour/day > interval or whenever the receiver and system clocks diverge by more > the "x" milliseconds. The main purpose of the time set feature is > for use when you don't have a net connection or NTP available. > The next version of Lady Heather has the ability to echo the > receiver data (in either native format or NMEA format) to another serial port > / IP address. > And for radio operations Heather has the ability to display the location in > Maidenhead format. > ___ > 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. Thanks to everyone for the replies, so basically would you say that with a permanent internet connection I should forget using GPS time to set the PC clock and just use Meinberg or NTP (which is what I am currently using and seems to work just fine)? -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Can Lady Heather set PC time directly from a Trimble Thunderbolt?
03/08/2017 14:50 I use an NTP client to set my Windows 7 64 bit PC time for digital mode amateur radio activities, but I was wondering if my Trimble Thunderbolt and Lady Heather can do the same job? If it can, how do I do it please, and can the PC show GMT and not UTC, and finally does the date glitch affect this? Lady Heather communicates with the GPS via a true serial port. Thanks! -- Best Regards, Chris Wilson. 2E0ILY mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] Beginners GPS locked frequency counter question
31/10/2015 10:46 I have a Racal counter locked to 1 MHz on its rear panel external input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz from a David Partridge divider board. If I also feed the counter with the 10 Mhz direct output from the same GPS it reads one or two Hz out. As I assume the counter is working purely mathematically why would that be please? As an aside, I work low frequency RF transmissions on 136 Mhz, and very narrow bandwidth. Can a soundcard be locked to GPS instead of its own internal crystal for precise frequency output? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Trimble Thunderbolt and David Partridge divider boardquestion
Hello,
on 13/10/2015 14:41 you wrote:
> I believe the author was looking into modifying his circuit to use
> a LTC6957 as a frontend. Not sure if he ever got around to it.
> https://www.febo.com/pipermail/time-nuts/2015-May/092138.html
> -=Bryan=-
Hi Bryan, now sorted, I have done some `scoping and the LF signal *IS*
getting into the divider. I added a splitter I bought from a US member
some time ago (thanks for the SMA TO BNC adapter cable!, and now the
sine wave is clean from the Trimble splitter. The signals from the
divider are still dirty when TX'ing though, but that's not an issue as
I rarely use them. Thanks for the info.
--
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Chris Wilson.
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[time-nuts] Trimble Thunderbolt and David Partridge divider board question
12/10/2015 14:58 I have had my Trimble and Dave's divider board for many years and it's on 24 hours a day, seven days a week, no problems. https://www.google.com/url?sa=t=j==s=web=1=rja=8=0CB4QFjAAahUKEwjr27ewjb3IAhVMVhQKHVmJALI=http%3A%2F%2Fwww.perdrix.co.uk%2FFrequencyDivider%2FFrequency%2520Divider%25202.1.pdf=AFQjCNHiXeXt-NZksvMBKYHfkJPf5mn_Fw=YJooGHWI_easGkSZHUVPJgThe Trimble uses a mushroom roof mounted aerial. I have recently built up an amateur band 136Khz station giving about 800 Watts into a terribly inefficient (electrically very very short) Marconi T aerial witha horizontal wire loop capacitive top hat. I have used the 10MHz out of Dave's divider board to lock a master oscillator in my Kenwood TS-590 transceiver, which is the driver for my 136kHz amp, giving just 0 dBm out. I have found when the TX is on at 136kHz the Trimble / divider baord output goes wild and a clean square wave goes seemingly random on my scope with noise. This unlocks the TS-590, blah blah. My questions are, is this likely to be RF affecting the Trimble, or the board? the baord feeds a panel in my shck with its vearious frequency divisions, the 10MHz output goes to the Kenwood TS-590 reference locking gizmo. The scope shows noise from a disconnected RG-316 co-ax at the panel end. Should I get up in the loft and try connecting the 10MHz direct from the Trimble and leave the board out as a test? Does anyone know if a strong 136kHz signal is likely to affect the Trimble itself? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Trimble Thunderbolt question, splitting its output.
Hello, on 20/05/2015 15:56 you wrote: Chris wrote: can I T off the T/Thunderbolt 10MHz feed to this board and take a second sine wave output direct from the Thunderbolt, to drive a transceiver GPS disciplined 10 MHz frequency standard input as well as having it feed the divider baord The input impedance of the divider board is nominally 50 ohms (closer to 45 ohms, with 1Vrms drive from the TBolt). If the transceiver has a high-impedance input (1k ohm or higher), you should be able to get by with a simple T connection. Run coax from the TBolt to a BNC T at the transceiver input, and another coax from the T to the divider board. This will work best if this second piece of coax is short (i.e., the divider board and the transceiver are physically close to each other). If the transceiver has a nominally 50 ohm input or the coax run between the transceiver and the divider board would be long, you should use a 50 ohm power splitter. Put the splitter close to the TBolt with a short run of coax, then run whatever lengths of coax are necessary from the outputs of the splitter to the divider board and the transceiver. Best regards, Charles As a belated follow up, is the fact the divider output is a square wave, rather than a sine wave detrimental to the feeding of the GPS disciplined master oscillator? or does it not matter? just curious as to whether it is important, thanks. The GPS disciplined oscillator is this one: http://www.vk3hz.net/XRef/XRef_Home.html#XRef-Vx -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Trimble Thunderbolt question, splitting its output.
Hello, on 28/03/2015 09:04 you wrote: Chris wrote: can I T off the T/Thunderbolt 10MHz feed to this board and take a second sine wave output direct from the Thunderbolt, to drive a transceiver GPS disciplined 10 MHz frequency standard input as well as having it feed the divider baord The input impedance of the divider board is nominally 50 ohms (closer to 45 ohms, with 1Vrms drive from the TBolt). If the transceiver has a high-impedance input (1k ohm or higher), you should be able to get by with a simple T connection. Run coax from the TBolt to a BNC T at the transceiver input, and another coax from the T to the divider board. This will work best if this second piece of coax is short (i.e., the divider board and the transceiver are physically close to each other). If the transceiver has a nominally 50 ohm input or the coax run between the transceiver and the divider board would be long, you should use a 50 ohm power splitter. Put the splitter close to the TBolt with a short run of coax, then run whatever lengths of coax are necessary from the outputs of the splitter to the divider board and the transceiver. Best regards, Charles That answers my question perfectly Charles, many thanks for the detailed reply, much appreciated. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Trimble Thunderbolt question, splitting its output.
Hello, on 28/03/2015 09:09 you wrote: The telco equipment that all these Tbolts came from had the 10 Mhz output feed 2 different modules using a MicroCircuits ZFSC-2-1-S two-way 0° 50 ohm power splitter. There are some of these splitters for sale on Ebay but almost any other similar unit should work. ___ 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. Ah, yes, I see them and have bought some, thanks a lot for pointing them out, I will use one for splitting the feed! -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Trimble Thunderbolt question, splitting its output.
27/03/2015 17:14 My T/Thunderbolt has operated flawlessly for some years feeding a David Partridge frequency divider board. The board gives 10Mhz and lower divisions of 10MHz down to the KHz level out, as square waves. What I need to know is, can I T off the T/Thunderbolt 10MHz feed to this board and take a second sine wave output direct from the Thunderbolt, to drive a transceiver GPS disciplined 10 MHz frequency standard input as well as having it feed the divider baord, which has a square wave output? Thanks. The .pdf for David's board is at: http://www.google.com/url?sa=trct=jq=esrc=ssource=webcd=4ved=0CDMQFjADurl=http%3A%2F%2Fwww.perdrix.co.uk%2FFrequencyDivider%2FFrequency%2520Divider%25202.1.pdfei=g5AVVbDXGcSy7QbLioCAAQusg=AFQjCNHiXeXt-NZksvMBKYHfkJPf5mn_Fwsig2=kXB0iLgZhoDuB8shplLFqAbvm=bv.89381419,d.ZGU? -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] 1900kHz radiolcation testing on east coast US?
Hello, on 08/12/2014 07:21 you wrote: I'm hearing the same signal in northern New Hampshire. Very strong 73, Frits W1FVB This is audible here in the UK and elicited many comments on 160 meters last night. Seen as oblique striations on SDR receiver displays and audible as a clicking sound. What the devil is it? -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Meinberg or T/Bolt for PC time?
11/08/2014 18:26 I have 4 windows based PC's on my home network, for years i have used Meinberg or an equivalent to set the PC time. I was wondering if I could, or should, use my permanently on Trimble Thunderbolt to set the PC clocks? Any advantages or disadvantages. I believe there's a way to use Lady Heather to interface with a PC for setting the time, is that true? Thanks. My main desire for accuracy is amateur radio digital modes. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] Lady Heather error when going full screen
03/08/2014 18:12 Since upgrading to a new desktop PC running Windows 7 pro 64 bit lady heather crashes if I use the top right full screen windows click box. If I use a command line to change screen size it enlarges fine. it never did this under XP pro. I managed to catch the very fleeting error by pressing Print Screen umpteen times until i was quick enough to grab it. the error is repeatable every time and I post a screen shot at htpp://www.gatesgarth.com/heather_error.jpg Is there an e-mail address for John Miles I might send it to if no one knows what it means? thanks -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Lady Heather error when going full screen
03/08/2014 18:12 Since upgrading to a new desktop PC running Windows 7 pro 64 bit lady heather crashes if I use the top right full screen windows click box. If I use a command line to change screen size it enlarges fine. it never did this under XP pro. I managed to catch the very fleeting error by pressing Print Screen umpteen times until i was quick enough to grab it. the error is repeatable every time and I post a screen shot at htpp://www.gatesgarth.com/heather_error.jpg Is there an e-mail address for John Miles I might send it to if no one knows what it means? thanks 03/08/2014 18:37 Typo, that should of course have been : http://www.gatesgarth.com/heather_error.jpg apologies. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] R.I.N. Journals
Hello Discussion, on 03/08/2014 22:56 you wrote: I have a box plus of Royal Institute of Navigation Journals going back several years. Free to a good home - UK - collection only. DE6 2AF post code. Cheers Rob Kimberley ___ 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. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Trimble Studio maps loading error
02/08/2014 12:06 I am trying Trimble Studio V 1.26.0 dated 6/11/2014 and when I press the MAP button I get the error in this screen shot: http://www.chriswilson.tv/trimble.jpg Has anyone any idea why, and what might fix it please? I am using it with my elderly Trimble Thunderbolt. Lady Heather works fine, but just thought I'd try this Trimble app. Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] test after email address change and repost of PRS10 question.
My recent attempts at posting have been all been blocked for some reason so I am switching email address in the hope that that corrects it. Here is my last one, hoping that it is not a repeat for you guys. Hi, I have just brought my PRS10 out of mothballs and am trying to get a good lock to my TBolt 1PPS. The 1PPS OUT signal from my PRS10 has a very slow rise time, in the order of 70ns. I would be grateful, if anyone here has one on their bench, to let me know what theirs is. I can't find any specification in the literature. Thanks and have a good day. Mike 28/01/2014 11:37 Hi Mike. Both messages (the earlier one from the orange.fr address and this one from the sfr.fr address) are showing. If you read the group using e-mail just CC the messages you post back to yourself and filter into the groups folder. Seems Yahoo changed things (again) recently. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Trimble Studio, what is it?
05/01/2014 10:57 I see occasional references to Trimble Studio here. What is it please? An alternative to Lady Heather for Thunderbolts, or have I missed the plot entirely? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Trimble Studio, what is it?
I found it here and the FTDI USB serial bus driver and the manuals. http://www.sectron.eu/products/3-results-of-finding/1558-trimble-gps-studio-for-download.html I haven't tried it yet. Dave 05/01/2014 16:21 Thanks Graeme, Bryan and Dave, I have it downloaded, will have a play with it later, much appreciated. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Thunderbolt SMPS question
18/07/2013 11:47 I have been chasing a really awkward BT ADSL line noise / line drop issue for weeks. In the end I realised why connecting to the BT master socket with an extension cable to the router stopped the issues, yet connecting the original twisted pairs BT cable brought it back I had installed a Thunderbolt on the roof and its SMPS was behind a studded wall in my upstairs office, right near the BT jack, with the cable running *right* by. I *THINK* either the TB itself, its power supply that came with it from China, or just possibly a 5V SMPS I use to power one of David Partridge's divider boards, also next to the TB power supply is the culprit. The 5V SMPS is just a wall wart, but regulated and branded. I can easily find another, or even build a little linear supply for it. I don't think the divider board itself is the cause. However, I am unsure just what, and how critical, the demands of the TB are. Has anyone had this sort of issue with a TB power supply, or had cause to either find another, or find an alternative? I am not yet sure if the PS is a sealed up box, or if a repair may be an option. Any advice please? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Thunderbolt SMPS question
Hi It's also likely to have issues if you don't have something between -7 and -13 on the V- supply. Current is low (10ma?). A good linear regulator is useful on the +12. The +12 rail drops back to 200 ma under most conditions once the oven has warmed up. Bob 18/07/2013 18:26 Thanks Bob, Robert and Azelio. I spoke too soon, the damned noise is back with the TB and divider supplies unplugged. I was really hopeful I'd cracked it there. Time to call my ISP to get BT out. Living in the sticks satellite internet is appealing right now :) -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?
Hi again, Chris; The HV at the end of the model number indicates that the unit is capable of handling high voltage (up to 5V - TTL level) on the sync channel. The 0.7/1.0 Volt switch is to provide a bit of extra gain for long cable runs. Aside from the HV difference, the unit appears to be very close to the ADA 3-80 in capabilities. It looks quite well suited for a DA. It has more channels than the ADA 3-80; a big plus. The HV option is not a detriment... the sync channel can be used for TTL level signals., whereas the normal channels are for low-level signals (0.3 - 1.5 VPP). Just curious, how much is this unit being offered to you for? Cheers, Dave M 19/05/2013 17:27 Hi Dave, I saw them on Ebay after a friend sent me the link. They are here in the UK, whereas all the ADA 3-80's I have found have been in the USA with associated high postage costs. Should I snap one up? http://www.ebay.co.uk/itm/Extron-ADA-6-300MX-HV-HDTV-RGBHV-1-x-6-Analog-Video-Distribution-Amplifier-DA-/200906840539?pt=UK_Sound_Vision_Otherhash=item2ec6fb19db Thanks Dave and Charles for the replies! -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Distribution amps for Thub=nderbolt and David partridges divider box?
On 19/05/13 19:12, Dave M wrote: Yes... .Jump on it! Seems to be a good price for it. If I needed a DA, I'd buy it in an instant. I just grabbed a pair! (After missing out on the Soekris boxes!) They should go well with the A2100 Timing Receivers that are currently sat in customs, and the Z3816A of mine, as well as the HP 5328B with a 10811, and the 8657B :) Hopefully I can convince a friend of mine to do the 75 ohm to 50 ohm surface mount conversion! Gotta love ebay when you (or someone else) knows what they are buying! Iain 19/05/2013 21:54 He appears to have plenty, but I was also notified he'd sold something like 15 in the last 24 hours, by an automated Ebay pop up? Just bought one myself! -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Me too. I have two 545A's, one of which works and the other of which has issues with Band 3, failing to read in a very interesting pattern suggesting a YIG filter issue, probably the control circuit. Just no time to chase it right now. Please post the resolution. Thanks. Joe 17/12/2012 12:31 Thanks to all who have assisted here, and in particular Paul Swed, who via Skype helped me do the final de bugging, with expert knowldege and good humour.. As requested the final resolution. The biassing of Q12 was critical and R54 had changed in value by some 25%. It should have been 11k, but I only had a 10k, which got it counting correctly on Band 2 again. I sourced the correct 11k resistors at 1% and also changed R55 and the 10 ohm in the 12 volt feed. All seems well now, although I have no means to check Band 3 above 1024 MHz, the limit of my signal generator. Any ideas on getting a high frequency into the thing? Hope this may help someone, the switching arrangement is a bit odd at Q12, I think I know why, but won't cloud the water with misinformation. Thanks everyone, have a good Christmas and a happy New Year. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Lady Heather for Linux?
11/12/2012 13:53 Is there a version of Lady Heather for Linux, or any equivalent application please? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
I have an EIP counter with a problem, stashed, that I need to look at eventually. So have been following the thread a bit. If you guys get somewhere conclusive (or not), might be nice to post a summary of all important details, techniques, or circuit notes beyond the manual, found, to this thread for closing to posterity searchers. (And me.) And, in the mean time, good luck, bon debugging. -Rex 10/12/2012 13:40 Will do Rex, but I was worried this thread may not have been strictly on topic for this reflector. Comments? -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Did do some more reading and I think what I suggest is the right approach. Band 2 and 3 use the same VCO. So if band 2 is generally working then its possibly the rf multiplier yig filter mixer diodes etc. But if the RF detectors show RF then its going to be a much more interesting issue. I do not know what sort of test equipment you might have. I have spectrum analyzers and such. And do agree without extenders that I don't have its a royal pain. Regards Paul. 09/12/2012 11:45 Thanks very much for your input with this, much appreciated. I do have a spectrum analyser, but it's a bit like having a set of surgeons implements. Interesting to have, but needing the requisite skill to use safely :) I can do only the most basic stuff, to be frank I am very wary of blowing the input stage up by doing something daft! I think I follow your train of thought here Paul. But, before seeing your post I did some tests at TP4, to see if the unit was constantly scanning for a signal when on Band 2. here is what I found and saw: I have now refitted the new Q12, and removed the test 1k resistor. OK, the trace from TP4 does different things depending what band it is on. Bands 1 and 3 it just sits there, #1. On Band 2 it gives what appears to be two traces, #2. Changing the timebase gives the other trace I show linked, #3. On bands 1 and 3 only a single trace appears. So Band 2 is doing something different at TP4, with no input signal. Warm Q12 with an input signal to Band 2 and the two traces change to a single trace, #4. Once it cools again the two traces return. Traces: #1 http://www.gatesgarth.com/scope/TP4-band1.jpg #2 http://www.gatesgarth.com/scope/TP4-band2.jpg #3 http://www.gatesgarth.com/scope/TP4-...t-timebase.jpg #4 http://www.gatesgarth.com/scope/TP4-...put-signal.jpg I would need explicit instruction to poke about using the SA. It's an HP 8568B. Thanks again Paul :) -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Chris TP4 is not all that helpful its a control signal. So let me back up for a minute. What are we troubleshooting? I was thinking band 2 was semi working and you still had a totally dead band 3. My comments have been around trying to see what was going on with 3. Other comment. I think we should take this offline. Most likely driving time-nuts nuts. :-) Do you use skype? Regards Paul On Sun, Dec 9, 2012 at 11:29 AM, paul swed paulsw...@gmail.com wrote: Didier is 100% correct though I use a 10 db pad for exactly the same purpose. You have to be careful. In your case there is a +28 db power amp that feeds the yig mixer in the 545. That would destroy the spectrum analyzer frontend. In fact if measuring that component you would want 30 db of loss using a 2 watt pad. Most spectrum analyzers run in the 0 to +5 or so db range. All of that said I actually have to look at your other comments to make some sense of what you are seeing. Regards Paul WB8TSL On Sun, Dec 9, 2012 at 7:22 AM, shali...@gmail.com wrote: Good practice with a spectrum analyzer is to put a 20 dB pad at the input all the time unless you are sure you don't need it for a particular measurement. It has saved my bacon many times. It also protects the input connector from excessive wear. Didier KO4BB Sent from my Droid Razr 4G LTE wireless tracker. -Original Message- From: Chris Wilson ch...@chriswilson.tv To: Chris Wilson ch...@chriswilson.tv, Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sun, 09 Dec 2012 5:54 AM Subject: Re: [time-nuts] EIP545A 18GHz counter query Did do some more reading and I think what I suggest is the right approach. Band 2 and 3 use the same VCO. So if band 2 is generally working then its possibly the rf multiplier yig filter mixer diodes etc. But if the RF detectors show RF then its going to be a much more interesting issue. I do not know what sort of test equipment you might have. I have spectrum analyzers and such. And do agree without extenders that I don't have its a royal pain. Regards Paul. 09/12/2012 11:45 Thanks very much for your input with this, much appreciated. I do have a spectrum analyser, but it's a bit like having a set of surgeons implements. Interesting to have, but needing the requisite skill to use safely :) I can do only the most basic stuff, to be frank I am very wary of blowing the input stage up by doing something daft! I think I follow your train of thought here Paul. But, before seeing your post I did some tests at TP4, to see if the unit was constantly scanning for a signal when on Band 2. here is what I found and saw: I have now refitted the new Q12, and removed the test 1k resistor. OK, the trace from TP4 does different things depending what band it is on. Bands 1 and 3 it just sits there, #1. On Band 2 it gives what appears to be two traces, #2. Changing the timebase gives the other trace I show linked, #3. On bands 1 and 3 only a single trace appears. So Band 2 is doing something different at TP4, with no input signal. Warm Q12 with an input signal to Band 2 and the two traces change to a single trace, #4. Once it cools again the two traces return. Traces: #1 http://www.gatesgarth.com/scope/TP4-band1.jpg #2 http://www.gatesgarth.com/scope/TP4-band2.jpg #3 http://www.gatesgarth.com/scope/TP4-...t-timebase.jpg #4 http://www.gatesgarth.com/scope/TP4-...put-signal.jpg I would need explicit instruction to poke about using the SA. It's an HP 8568B. Thanks again Paul :) -- Best Regards, Chris Wilson. ___ 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. ___ 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. ___ 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. 09/12/2012 19:53 Will send direct e-mail thanks for everyone's he;p and patience. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Two rules to follow. 1 - use well shielded cables for the 10 MHz distribution if you wish to receive WWV 10 off the air. The skinny cables used for Ethernet generally don't cut it. 2. Most instruments have a high impedance 10 MHz input. Put them in the middle with T connectors left over from your 10 base T days. If you have an instrument that terminates the 10 MHz input, it goes last. Otherwise use a terminator at the end. I have an Advantest spectrum analyzer, HP selective level meter, Racal-Dana counter, Flexradio 1500, and Gigatronics generator daisy chained from a Thunderbolt. Plenty of signal, and the fat (well shielded) cables let me listen to WWV. 08/12/2012 11:30 Thanks for that Chuck, appreciated. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
SNIP__ This is where I am now, I hope the above makes some sense if viewed with the service manual and the schematics. Thanks. 07/12/2012 10:17 Latest update: Removed Q12 from board A109 and put a 1k resistor across vacant emitter and collector board holes, thus putting 12 volts into the mixer to switch it externally. Counter now works perfectly on Band 2 and I followed the signal path from R2 / R3 junction (wrong impedance, but a reference nonetheless) through to the anode of CR3. Hopefully self explanatory with regard to file names, scope patterns are at http://www.gatesgarth.com/scope/scope.zip Pretty stuck as to where to go next now. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
zeros Warming Q12 makes no difference TP 3 No input signal 1.5V TP3 10 MHz 1.5V Displays zeros TP3 50 MHz 1.5V Displays zeros TP3 100 MHz 1.5V Displays zeros TP3 400 MHz 1.5V Displays zeros TP3 500 MHz 4.1V Displays frequency TP3 900 MHz 0.0V Displays frequency - TP4 No input signal 4.5V Displays zeros TP4 10 MHz 4.5V Displays zeros TP4 50 MHz 4.5V Displays zeros TP4 100 MHz 4.5V Displays zeros TP4 400 MHz 4.5V Displays zeros TP4 500 MHz 4.9V Displays frequency TP4 900 MHz 4.9V Displays frequency - TP11 No input signal 0.11V Same voltage across all frequencies Displays zeros until it gets a 500 MHz input, with which, and up at 900 MHz the counter displays the frequency. - Another test: TP2 30 mV input signal @ 10 MHz 3.4 / 3.5V displays zeros Warm replacement Q12 with tip of barely hot iron, momentarily. 4.9V and displays frequency -- On Band 3 with no input signals to the counter TP2 shows 4.9V -- On Band 2 with no input signals to the counter TP2 shows 3.4 / 3.5 V (wavers about between the two). Q12 voltages E 12.07V no input signal : 12.08V with 980 MHz @ 50mV frequency is shown B 11.66V no input signal : 11.68V with 980 MHz @ 50 mV frequency is shown C 0.22V no input signal : 0.0V with 980 MHz @ 50mV frequency is shown C 0.22 V no input signal : 0.22V with 10 MHz @ 50mV no frequency shown (zeros) Warm Q12 and collector voltage starts rising instantly and around 0.52V the counter shows 10 MHz. Keep warming a bit more and collector voltage rises as high as 11.9V As Q12 cools voltage smoothly falls and counter stops showing 10 MHz frequency at about 0.52V and shows zeros. A minute or so after warming collector voltage is back down to about 0.22V with the 10 MHz input signal @ 50mV and counter still shows no frequency (zeros). Swapped the U2 and U7 chips over. Exactly the same, warming Q12 starts the counter displaying 10MHz, but only zeros until it's warmed. But TP goes from about 4.4V to 0.1V I am going to swap them back and repeat the test... Which I have just done and both chips are effectively operating the same, so I do not believe Band 2 PIA device U2 is faulty. __ This is where I am now, I hope the above makes some sense if viewed with the service manual and the schematics. Thanks. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Chris, Put a ohmmeter across any of the capacitors on the GPIB board and see what the resistance is. Since that kills the unit, I suspect the resistance is low (?shorted tantalum) or there is a problem with one of the chips that takes the 5 VDC buss down. Make sure of the polarity of your DMM, + to + and - to ground. Alternatively, there is a short on the +5 VDC line at the connector on the mother board that is 'actuated' by plugging the board in. Measure the resistance to ground of the +5 VDC buss (power off) with the GPIB board plugged in and not plugged in. Joe Thanks again Joe, checked the tants on the GPIB board and they seem fine, have put this aside until the rest is AOK. Then I'll pull the chips one by one and try and isolate the issue. The 5 v bus seems good with the board in or out, too. 29/11/2012 09:27 -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
29/11/2012 09:30 The replacement for the missing U6 chip arrived this morning and it now completes the 200 MHz self test It will read up to the limit of my frequency generator on Band 3 which is only 1040 MHz, but looks promising. Band 2 also works, but seemingly has an anomaly. I cannot get Band 2 to read below 185.000 MHz. If I input 184.900 it won't read it and displays zeros. 185 and up is OK... Weird. It should read from 10 MHz up to 1 GHz. It'll go to 1 GHz plus AOK. Band 1 appears to work fine. These tests are with both my GPS referenced external standard and the internal reference used. So Band 2 appears to have a further issue. Will refer to the manual and see if I can fathom it out. Any ideas as to why Band 2 will only read from 185 MHz upwards please? Thanks. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Frequency generator and counter on same external reference?
29/11/2012 09:40 I don't think this is an issue, but thought it best to ask. I am repairing an 18GHz counter and it has a 10MHz external reference port. So does my elderly Marconi 2019A sig gen. Is there any potential issue having them both referenced off my Thunderbolt GPS referenced standard, at the same time? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
It sounds like a SW limit, not hardware. Silly question: Have you read the manual? -John 29/11/2012 15:31 Hi John, will re read the section on limits, but please see my reply to Chuck I just posted. Cheers. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Frequency generator and counter on same external reference
Good heavens, no. By doing so, they both have the same reference and the measuremets actually means something. I have a stack of HP stuff (3586, 3386 and assorted counters) all T'd off my Tbolt without issue. The only caveat is that you don't put too much stuff across the T-bolt output so as to load it down to the point where some device can't get clocking. Before you hit that point, you may need a high quality (low jitter) distribution amp in the timing chain. 29/11/2012 15:44 I thought it would be fine, but thought and know can be poles apart at my level of knowledge :) Thanks for that. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
29/11/2012 09:30 The replacement for the missing U6 chip arrived this morning and it now completes the 200 MHz self test It will read up to the limit of my frequency generator on Band 3 which is only 1040 MHz, but looks promising. Band 2 also works, but seemingly has an anomaly. I cannot get Band 2 to read below 185.000 MHz. If I input 184.900 it won't read it and displays zeros. 185 and up is OK... Weird. It should read from 10 MHz up to 1 GHz. It'll go to 1 GHz plus AOK. Band 1 appears to work fine. These tests are with both my GPS referenced external standard and the internal reference used. So Band 2 appears to have a further issue. Will refer to the manual and see if I can fathom it out. Any ideas as to why Band 2 will only read from 185 MHz upwards please? Thanks. 29/11/2012 15:53 OK, I may be doing something foolish. David Partridge was able to supply one of his last remaining frequency dividers to me, for use with my TB GPS standard. It works perfectly and is now in a nice enclosure feeding a small array of BNC sockets on my shack wall. I take the 10 MHz output of the Thunderbolt into David's frequency divider: http://www.perdrix.co.uk/FrequencyDivider/index.html I have the 10MHz output from David's divider feeding the counter. When fed from this the Band 2 seems unreliable starting at 10MHz. If I feed it 10Mhz at 50mV from my sig gen it starts reliably. Is it a mismatch from the divider, or has it perhaps not got enough drive level? -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Chris wrote: I have the 10MHz output from David's divider feeding the counter. When fed from this the Band 2 seems unreliable starting at 10MHz. If I feed it 10Mhz at 50mV from my sig gen it starts reliably. Is it a mismatch from the divider, or has it perhaps not got enough drive level? First, what does the counter manufacturer's specification say with respect to acceptable signals at the external reference input? Second, what happens if you feed the TB output directly to the counter's reference input? IIRC, the outputs of the Partridge divider are 5V TTL from a ~50 ohm source, so low peak-to-peak signal amplitude should not be an issue. If anything, the divider could be overdriving the counter's reference input. Note that the TTL signal ranges from 0V to ~+5V and does not cross ground -- if the counter is expecting the reference to be bipolar (i.e., if it switches on a zero-cross), it may not respond reliably to TTL levels. Beyond that, depending on how the counter terminates the external reference line, you may have steps or ringing at the reference input (see the thread on terminations). Look at the counter's reference input with a high-impedance (divide by 10) scope probe to see what the feed looks like there. Best regards, Charles 29/11/2012 17:32 It's definitely playing up, and I don't think I have it right with regard to it being because I am feeding it from David's divider. I let it go cold this afternoon and have just come to it now. Even with the signal into Band 2 direct from my sig gen at 1 volt it doesn't start counting unless I go to, or over, 185 MHz. Band 3 is fine from cold, as is Band 1. I'll get some freeze spray and see if I can isolate any part. I'll also have a go with the air line. So near to being fine, must be something pretty minor? Band 2 should work from -20dbm (22mV RMS) right across its 10 MHz to 1 GHz range according to the manual. Even with 190 MHz into it it takes at least 30mV to start triggering, sometimes up to 40 mV. 40 mV will reliably fire it across its full range once it warms up a bit. Band 1 specs are 22 mV from 10Hz to 1 GHz, and that band triggers with just 15 mV at 10 MHz, but needs 25 mV at 100 MHz. Band 3 specs are 12 mV at 1 GHz to 1.2 GHz (needs 15 mV @ 1GHz) 1.2 to 12.4 GHz should trigger at 7 mV but my sig gen stops at 1040 MHz so can't test. Thanks for your input Charles. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] EIP545A 18GHz counter query
27/11/2012 14:18 I bought a 18GHz EIP545A counter which the vendor said was working fine the day before and when on overnight soak test, and also when last used some months agao. But when he checked it on the morning of my coming over to see it he found it had developed a fault... I bought it off him cheaply, as seen, hoping it might be fixable. Here's the basic tale: It was acquired displaying just dashes. I checked the PSU voltages and found the PSU section outputting well away from the manual figures. I corrected these and checked supplies for ripple and they were all good. I then decided to remove any board that was not essential to operation. It came with a GPIB option board, so I pulled it. Luckily this did some good and a working display appeared. There were three tantalum caps on this board, as a matter of interest I pulled a leg on each and tested them, all were OK. Refitting it killed the display back to dashes again, so I set it aside as having an unknown fault, and continued. I can get it to accurately display up to EXACTLY 188. MHz. Inputting 190. MHz gives zeros. It has three frequency bands. Band one works perfectly right up and well beyond its 10Hz to 100MHz range. Band two often doesn't work at all, and just diplays zeros, it's a 50 ohm input, compared to the 1meg 20pF Band 1 input. Sometimes by ramping the frequency up slowly from 100 MHz I can get a seemingly random reading. Band 3, the GHz range, doesn't work at all. Again, only zeros are displayed. The machine has quite a good range of self diagnosis tests. Tests are via the key pad. The first test checks the VCO and other stuff, and should display an accurate 200. MHz. It displays well over, always in the range 253.5 and the display isn't stable, it hovers over several KHz. There's a tree menu to see where this issue could lie. One limb suggests using a known good counter on the output of the VCO. I did this and the output is miles high in frequency, about double, and unstable. The tree menus goes on to suggest a phase lock circuitry fault. Further tests seem to depend in part upon using something called a Signature Analyser, which I have never even heard of They suggest an HP5004A, which is apparently pretty ancient. Is there a cheap way of acquiring something to do this sort of testing? I believe given a few pointers my scope, multi meter, sig gen and my other (working) Racal counter could take me further. It's a nice old thing, and I would quite like a means of counting into the higher frequencies it offers, but don't want to spend too much time or money on it. It works a damned sight more than when it first landed, which has kind of given me incentive to push a bit further, given I have a .pdf copy of the repair manual. Here's the page of the schematic I think is relevant, if it is a phase locked loop problem. This morning I realised there's a chip missing from a socket on the board in question. It's U6, a flip flop, part of the pre scaler I think? I assumed it was for some option, not fitted, but I am not so sure now. A Chinese Ebay seller is breaking one of these machines and he lists all the boards seperately, with decent photos. His board has this socket populated, and looking at the schematic, (linked at the bottom of this post), I think it's probably a vital component? I am sure the seller must have known about this, but who knows... I have ordered a new chip and will fit it whwen it arrives tomorrow. Now, assuming I ever get this thing up and running fully, is there a quick and dirty way of producing a test signal in the upper limits of its range to check it out, given my Marconi sig gen stops at 1040 MHz? Perhaps using a diode to give some harmonics? Diagram of the board I believe is faulty and missing the chip is at: http://www.gatesgarth.com/phaselockloop.jpg The text for this section, from the manual is at: http://www.gatesgarth.com/phaselocklooptext1.jpg and at http://www.gatesgarth.com/phaselocklooptext2.jpg Thanks for looking! -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] EIP545A 18GHz counter query
Hi Chris, The first thing you should do is join the EIP_Microwave group at yahoo: http://tech.groups.yahoo.com/group/EIP_Microwave There's lots of info and help there for EIP counters. Don't worry about the signature analyzer for now. It would normally be used if the processor was dead. The fact that Band 1 works means that the processor/memory is okay. If the processor / memory / display related diagnostics like 02, 03, 04, 05 also pass, then signature analysis is unlikely to tell you anything more. The first thing you have to do is replace that missing chip. Bands 2 and 3 require the VCO and phase-lock circuitry to be working. As far as I can see, U6 is not optional. Until the 200 MHz test passes, you can't get any further. Be sure to check for obvious problems. I bought a 545A parts unit that wouldn't pass the 200 MHz test. It turned out that some of the board-to-board cables were plugged into the wrong connectors! I'm in the same position as you regarding testing at high frequencies. You might be able to get a signal at the second or third harmonic of your generator by cranking the level to the maximum and then using the counter's Band 3 frequency limits feature to only look at that frequency. My HP 8647A only goes to 1 GHz, but I can see harmonics up to 3 GHz. I've also picked up a few cheap YIG oscillators that have allowed me to test in the 1-10 GHz range. Watch out for the signal levels. YIG oscillators have lots of output! By the way, I'd be reluctant to purchase anything else from that vendor. Chips don't evaporate overnight. Mind you, I guess chips have fallen out of sockets. Any strange rattling noises when you shake it? :-) Ed 27/11/2012 22:08 Thanks Ed, someone else kindly e-mailed me and told me of the existence of the Yahoo reflector for EIP equipment. Sadly U6 is definitely not rattling about in the case :( Happily I didn't pay a lot for this thing :) I have had all the boards out and double checked all the cables are correctly connected. The only issue apart from the missing chip is that installing the GPIB board kills the thing completely. I am not sure why, but I can live without that. It seems it may the power meter and DAC options, at least the buttons are present, but pressing them gives Error 13. Are the buttons present on all the front panels? The processor, memory and display tests pass AOK. If I get it running further I may try and boorow a friends microwave sig gen, rather than try getting clever and break it agin with too high an input signal. Thanks very much for the tips Ed, much appreciated. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] GPS antenna in attic?
I'm beginning to set up in my new house and planning where all my various antennas are going to go. Being a wood frame building, I was wondering if it was sufficient to simply mount my Thunderbolt GPS antenna high in the attic. It would be convenient as there is already a high quality CATV line running from there to my lab area that I'm not going to use and the Thunderbolt antenna system is 75 ohms. Will I have much attenuation going through an asphalt shingle roof? What if it is wet? Or has some snow on it? Another advantage for me would be I could mount that antenna on the opposite end of the house from where I will have VHF and UHF transmitter antennas. Peter 26/11/2012 08:56 I get a piece of fairly thin aluminium sheet and bend it so it slips under one roof slate, up towards the ridge, and it has another small downturn to hook over the top edge of the tile below, to stop the ali sheet slipping down and out. The exposed edge of the sheet is bent so it's horizontal. I mount the sensor on the horizontal bit, and the lead goes through a gap between the tiles, or under a tile. The lead is thin enough for this. No drilling, no potential water leaks. I have mine alongside a skylight (Velux window) so I just reached through to install it. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Thunderbolt distribution amplifier needed.
21/08/2012 11:40 Can anyone please link specifically to a suitable distribution amp for my TB please, either here if it's allowed, or by e-mail to me at ch...@chriswilson.tv ? Cost is a factor, and I am in the UK. An Ebay purchase would be painless. I feel it would be really easy for someone as daft as me to buy something totally unsuitable. I want to run David Partridge's divider board and have enough 10MHz signalleft to run other stuff as well, David recommended I run the amp between the TB and his divider. Cheers. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Thunderbolt GPS and frequency divider loading question.
The input of the divider is 50 ohm terminated. Dave 16/08/2012 01:24 Thanks Bruce and Dave, is it worth me adding a switch to allow the sine wave 10 MHz output to go to a separate socket on my distribution panel? Are there likely to be many scenarios where I might need the straight sine wave from the TB, or will the signal from the divider do the same job, as well, for almost all purposes? Thanks. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Thunderbolt GPS and frequency divider loading question.
13/08/2012 22:18 David Partridge was able to supply one of his last remaining frequency dividers to me, for use with my TB GPS standard. It works perfectly and is now in a nice enclosure feeding a small array of BNC sockets on my shack wall. My question is, if I take the 10 MHz output of the TB into David's frequency divider: http://www.perdrix.co.uk/FrequencyDivider/index.html is it loaded much? Can I T off at the TB 10 MHz output port and feed a socket on my distribution panel to see the unadulterated 10 MHz sine wave as well as having it feeding the divider? It's very useful as I now have a 1 MHZ standard to run my old Racal frequency counter off, plus all the other output frequencies. I used to use the 10 MHz output of the TB direct to the Racal, but had to remember to do the maths, I was a bit surprised 10 MHz worked at all into the external standard 1 MHz input port.Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output?
24/07/2012 13:14 My Racal Dana 9908 can take a 1 Mhz external reference. Inputting my Thunderbolt at 10 MHz works, but shifts the decimal point over. I am not sure if this has any other detrimental effects as to accuracy or other? What's the easiest way to have a 1 MHz reference from the Thunderbolt for this timer / counter please, yet retaining 10 Mhz for my other devices that want a 10MHz reference signal? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output?
Ready made or to be built? Use a divide-by-10 (7490-like) set to divide with 50% duty cycle or divide by 5 then by 2. Thanks for the reply Azelio. Sorry, should have said, ready built, got too many half finished jobs on the go right now. FAR too many according to my wife Will be needing some sort of line distribution amplifier soon, been buying test gear! I believe some people have had good results with TV aerial distribution amps? Thanks. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output?
A Tektronix DD501 will do divide by 10, or any number from 2 to 9. -John Thanks, was hoping for something as a permanent, small and cheap fitting, standalone. Don't really want to tie up my 7233 running something to run something else IYSWIM? Was hoping China Town would have the answer for low $$'s :) -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] What's the easiest way to divide by 10 for Thunderbolt reference output?
Chris, my vote is for the David Partridge 'time-nuts' frequency divider that was discussed and optimised here in detail some time ago. It divides everything you might need from the 10 MHz input. There are separate outputs for 10 MHz, 5 MHz, 1 MHz, and one that can be configured for 100 kHz / 10 kHz / 1 kHz / 100 Hz / 10 Hz / 1 Hz. I think David might still have some populated boards. Adrian Didn't know about that, and i was at David's house last week, as well... Hmmm! Sounds the way to go, I'll e-mail him later, thank you Adrian. 24/07/2012 19:13 -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Thunderbolt mounting
I would like to put my Thunderbolt into a chassis with power supply and would like to have the most favorable thermal environment since the unit is somewhat temperature dependent. I was thinking of mounting the unit in insulating material, but am worried it will get too hot to the point the temp control loop won't work properly. Has anyone experimented with this and found the best solution? I would like to remove the strong dependence on room temperature that I have currently. Peter Does anyone know if there's a means to log max and min temps for these things? I was going to make a crude box for mine out of 2 inch cavity wall insulation hard foam, with an air space between the box internal walls and the TB, but like the other poster, I am unsure if it would cause too high a temp without an additional fan and ventilation slots? Do most users do what i do and leave them on 24 hours a day, seven days a week? -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Naive reference oscillator qustion, but has to be asked!
29/06/2012 10:49 Titter if you must, but if you don't ask, you don't learn. My newly acquired Kenwood TS-590 transceiver has an option for a temperature controlled reference xtal module. The specs for it are : Output Frequency . . . . . . . . . . 15.6 MHz Temperature Stability . . . . . . . . . . . . . . . Within +/- 0.5 ppm (–10°C ~ 50°C) . . . . . . . . . . . . . . . Within +/- 1.0 ppm (–20°C ~ 60°C) Frequency Stability (long term) . . . within +/- 1.0 ppm/year Output . . . . . . . . .. . . . . . . 1.0 Vp-p (10 k ohm // 10 pf) Could the output of a GPS disciplined 10MHz standard be altered in frequency for this purpose? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Naive reference oscillator qustion, but has to be asked!
You could use a frequency synth with an external 10 MHz reference to generate the required 15.6 MHz signal. On 06/29/2012 02:54 AM, Chris Wilson wrote: 29/06/2012 10:49 Titter if you must, but if you don't ask, you don't learn. My newly acquired Kenwood TS-590 transceiver has an option for a temperature controlled reference xtal module. The specs for it are : Output Frequency . . . . . . . . . . 15.6 MHz Temperature Stability . . . . . . . . . . . . . . . Within +/- 0.5 ppm (–10°C ~ 50°C) . . . . . . . . . . . . . . . Within +/- 1.0 ppm (–20°C ~ 60°C) Frequency Stability (long term) . . . within +/- 1.0 ppm/year Output . . . . . . . . .. . . . . . . 1.0 Vp-p (10 k ohm // 10 pf) Could the output of a GPS disciplined 10MHz standard be altered in frequency for this purpose? Thanks. 29/06/2012 11:36 Thanks, is it worth even thinking about, or is the Kenwood add on TCXO module more than adequate? Only reason I ask is I will be using the rig as a driver for a microwave transverter. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Lady Heather V3.10 release
Le 21/06/2012 00:18, mike cook a écrit : 39.517°N, 76.794°W Recognise it? Flashy place near Baltimor. Oops I just looked at the installed properties and see they point to a LH server. Aargh! All OK now. ___ 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. 21/06/2012 11:04 It confused the hell out of me, too, for a while until I looked at the icon's description properly! :) -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Another ThunderBolt cabling question
13/06/2012 22:27 About to do the permanent installation, if I bring two leads from the 10 MHz and 1 PPS BNC sockets on the TB to a panel in my shck can i have say 5 BNC sockets on the panel wired in parallel, with the lead from the 10 MHz socket on the TB feeding them all? And a single socket for the 1 PPS? Any need to screen the back of the socket panel, or enclose it in a metal box? Cheers. Oh, I have been running lady Heather for a while tonight, here's a screen capture, does it look OK, ther's suddenly just two traces appeared? Thanks. http://www.chriswilson.tv/heather.png -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] Thunderbolt won't set a stored position?
12/06/2012 07:46 I left my newly acquired Trimble Thunderbolt running from a reset from Thunderbolt Monitor all last night but this morning it still hasn't achieved a Stored Position lock. Is it normal to take a long time to do this, or is a setting wrong somewhere? I have put a screenshot of the monitor as I found it this morning at: http://www.chriswilson.tv/trimble.png It has also always shown a Leap Second Pending minor alarm, but I believe this is quite usual? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
[time-nuts] Dimension 4 and GPS time disagree, why?
12/06/2012 11:59 I run Dimension 4 as a time standard on my POC's, mainly for using JT65 digital radio communications. It polls tick.usno.navy.mil for the time. I have noticed since getting my ThunderBolt set up that the GPS time is about 15 seconds in advance of my PC clock, despite a correction via Dimension 4 immediately before checking the difference. Why is that please? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] Dimension 4 and GPS time disagree, why?
I run Dimension 4 as a time standard on my POC's, mainly for using JT65 digital radio communications. It polls tick.usno.navy.mil for the time. I have noticed since getting my ThunderBolt set up that the GPS time is about 15 seconds in advance of my PC clock, despite a correction via Dimension 4 immediately before checking the difference. Why is that please? Thanks. -- Best Regards, Chris Wilson. Chris, you do know that GPS time and UTC are offset because of accumulated leap seconds? http://tycho.usno.navy.mil/gpstt.html 73, David GM8ARV 12/06/2012 12:27 I do now! :) Thanks for that and the replies by e-mail. I have tried setting the ThunderBolt to UTC and now the results agree perfectly. Thanks David! -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] Thunderbolt cabling questions
10/06/2012 22:26 My Thunderbolt, PSU and antenna should arrive this week. I would like to put out it outside my shack, which is an upstairs room in a bungalow. Outside of the plasterboard walls of my room is a big empty roof space. Can I put the TB in there, with it's PSU and feed the antenna wire out under a ridge tile and have the antenna itself on an aluminium bracket with a clear sky view on the ridge of the roof.? It would mean a cable from the output of the TB back into my room of about 10 or so feet. Anything I need to watch for, does the PSU run particularly warm? How much current do they draw off the mains, it's not going to cost a bomb leaving it on 24 hours a day, is it? Thanks. 11/06/2012 13:43 Thanks for the replies, I never intended to have the TB unit itself outside, just in the roof space, which pretty much follows the temperature of my room anyway, as I only heat it in very cold weather as the room pretty much follows the temperature of the rest of the hose. The stuff arrived this morning, with regard to the antenna, does it need to see the sky from horizon to horizon? Or would a mount a few feet above the gutter of the bungalow be adequate? I am not sure how many satellites it needs to see to work properly. A mount about 3 feet above the gutter line would be neat and trivial. Thanks again. -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] Thunderbolt cabling questions
10/06/2012 22:26 My Thunderbolt, PSU and antenna should arrive this week. I would like to put out it outside my shack, which is an upstairs room in a bungalow. Outside of the plasterboard walls of my room is a big empty roof space. Can I put the TB in there, with it's PSU and feed the antenna wire out under a ridge tile and have the antenna itself on an aluminium bracket with a clear sky view on the ridge of the roof.? It would mean a cable from the output of the TB back into my room of about 10 or so feet. Anything I need to watch for, does the PSU run particularly warm? How much current do they draw off the mains, it's not going to cost a bomb leaving it on 24 hours a day, is it? Thanks. -- Best Regards, Chris Wilson. mailto: ch...@chriswilson.tv ___ 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.
Re: [time-nuts] GPS and Rubidium frequency standards and noise question (newbie).
06/06/2012 23:47 Just to thank everyone for the warm welcome and splendid advice, I couldn't have asked for anything more. A great bunch of boffins (in the nicest possible way ;)) I have just ordered from a well known auction site's China Town a Thunderbolt kit and will be looking forward to installing it in my shack when it arrives. It should be a great starter and give me confidence the readings from various items of test gear. If you can't trust the test gear, you are a bit stuffed! As an aside, and very off topic, I am wanting a decent used spectrum analyzer. If I lived in the USA they appear to be oozing from the woodwork, over here in the UK they are harder to find in demonstrably working order for a decent price. My top budget is £950. I can collect and I can make snappy decisions. Thanks. -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] GPS and Rubidium frequency standards and noise question (newbie).
Hi For your immediate need, a Thunderbolt sounds like the ideal solution. It will give you a very accurate reference to sort out your test gear and likely good enough phase noise for most of the rest of what you want to do. Once you get into the microwave stuff, plan your PLL's properly and all will be well there. Bob I have thought of something I am unable to find an answer for via the normal Googling, etcetera. When I get my GPS locked standard will it be able to feed several items of test equipment simultaneously? IE, say a sig gen, a frequency counter, and my possible next purchase, a Signal Hound USB spectrum analyser? I believe a friend once said he uses a GPS reference throughout his shack, but I wasn't sure if he meant to multiple devices at the same time, or individually, manually swapping cables al the time. Thanks. 06/06/2012 01:16 -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] GPS and Rubidium frequency standards and noise question (newbie).
03/06/2012 19:09 Thanks for the great replies! My immediate need is to check some used test equipment I have bought, a Racal dana 9908 counter and a Marconi 2019A signal generator. They don't agree with one another! I was going to get a Thunderbolt unit and PS, but my friend mentioning noise got me worried. I may have a play with some SDR gear and I know they can be locked to a standard i you have one. Longer term my aim is to have a play with microwaves, which is what this friend is into, and maybe he has a particular issue with noise with sort of multiplication he is using? The fact that a GPS reference can be always on and locked to a reference that someone else maintains, if I understand things correctly, if simplistically, appeals. I am happy to be guided though, and I suppose I could always get a different type later if the specific need arose, although I am not made of money ;) Thanks! -- Best Regards, Chris Wilson. ___ 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.
Re: [time-nuts] GPS and Rubidium frequency standards and noise question (newbie).
Hi For your immediate need, a Thunderbolt sounds like the ideal solution. It will give you a very accurate reference to sort out your test gear and likely good enough phase noise for most of the rest of what you want to do. Once you get into the microwave stuff, plan your PLL's properly and all will be well there. Bob OK, I'll go for a Thunderbolt, is it allowed and acceptable etiquette to show an Ebay ad to check it's the later type, which I think it is? You have all been a great help, thank you very much indeed, I doubt I will become as obsessive with accuracy as some of you apparently are, but it's good to know that such a friendly and sharing group of experts exists in one locale! 03/06/2012 22:50 -- Best Regards, Chris Wilson. ___ 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.
[time-nuts] GPS and Rubidium frequency standards and noise question (newbie).
I am looking to get a frequency standard for my amateur radio shack, initially for verifying test gear readings, but later as a standard to lock receiver and transmitter oscillators to. I was going to buy a GPS frequency standard but a friend warned me these may have noise issues when I come to use it with an oscillator in RX / TX applications. It's not something I had considered, so what's the score here please? Should I not buy a GPS standard? Thanks. Any links to known safe suitable purchase sources from personal experience welcome, either here or by PM or e-mail. I am in the UK. -- Best regards, Chris Wilson mailto:ch...@chriswilson.tv ___ 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.
