Re: [time-nuts] 10MHz to 32MHz?
And if the 32 mhz source is a sealed unit, I suspect you will find that once you mechanically set it as close as practical, that varying the Vcc will allow you to use it as a narrow VCO. Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Magnus Danielson Sent: Saturday, April 21, 2007 7:55 PM To: time-nuts@febo.com; [EMAIL PROTECTED] Subject: Re: [time-nuts] 10MHz to 32MHz? From: "Bruce Lane" <[EMAIL PROTECTED]> Subject: [time-nuts] 10MHz to 32MHz? Date: Sat, 21 Apr 2007 11:26:23 -0700 Message-ID: <[EMAIL PROTECTED]> > Fellow time-clockers, > > I have an interesting (if a bit annoying) situation. I would like to use one of my existing GPS standards to improve stability on one of my HF transceivers. The problem is that said transceiver, for reasons unknown to me, uses a 32MHz reference oscillator. > > The highest GPS-lock frequency I have available is 10MHz. Suggestions for using this to produce a 32MHz reference would be welcome, as my skills for this kind of design are a bit rusty. The most straight-forward fashion is naturally to lock it through a PLL. Highest common comparator frequency is 2 MHz, so divide 10 MHz by 5 and 32 by 16, compare with SR-gate, use either a passive lag or better yeat, and active loop. Three digital ICs and an op-amp. If the 32 MHz reference is a crystal then hooking into the caps for a varicap is easy enought for most hams. Cheers, Magnus ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Software Sawtooth correction prerequisites?
What is the cost of the two channel pci system, if you happen to have the price in hand. If not, I will ask direct. Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr Bruce Griffiths Sent: Saturday, May 12, 2007 7:00 AM To: Tom Van Baak; Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Software Sawtooth correction prerequisites? Tom Van Baak wrote: >> Define cheap. >> You can already get essentially single chip TICs with a resolution (and >> accuracy) better than 100ps for around 100 Euros or so. >> > > Has anyone in the group tried one of these? I would very > much like to see the results. > All except Xavier seem to have shied away from obtaining these on cost grounds and the need to layout a 4 layer PCB. Although the vendor does offer an evaluation system (External box plus card plugs into PC with fat multiconductor SCSI type (but not SCSI signalling)cable connecting the two), too expensive for general use but perhaps useful for performance evaluation. The above price was for an earlier version the later reduced cost higher resolution version (range 5 nanosec - 4millisec) should be cheaper. The range can easily be extended to years if required (using CPLD counters (or even a PIC with built in counters - eg PIC18F4550) + software+ 74AC164). >> However the optimal solution doesn't use a TIC at all, just use a good >> GPS receiver that makes the carrier phase observables available. >> Quite a few of the older receivers used to make the carrier phase data >> available. >> > > Many of the Oncore VP's did this, but I don't know of > anyone, amateur or commercial, that built a GPSDO > using that feature. That makes me wonder if carrier > phase observables alone is not enough. > You also need code phase measurements as a sanity check, to determine the ionospheric delay, and to initialise the control loop. To obtain maximum performance you also need to know the GPS antenna location accurately. This may take several days to establish using code phase SV transit data. >> The catch is that the GPS receiver local oscillator must be phase locked >> to the OCXO. >> Some receivers use a 10MHz crystal oscillator in which case this can be >> removed and replaced with an external 10MHz signal derived from the OCXO >> being disciplined. >> > > Right, this is the key. Do you know any OEM receivers that > allow an external 5/10/20 MHz? I know my Z12T does (but that > is far from an OEM receiver). > > The Novatel SuperstarII receivers use an on board Rakon 10MHz TCXO (made a little (120km) to the North of me) local oscillator which can be disconnected with relatively little surgery and replaced with a piece of thin coax and a connector. However the required amplitude is relatively small - easily fixed with a pair of resistors - typically the output from the onboard TCXO itself has to be attenuated. Magnus acquired some of these cheaply, however even the new price isn't too steep. UNSW has used these receivers in geodetic survey/monitoring applications. The code phase field data from some of these exhibits encouraging stability (about 5 -10x better than the oscillator specs) when averaged over a few seconds even with the standard TCXO. If you want to roll your own GPS receiver the MITEL/ZARLINK chipsets use a 10MHz reference. >> Unfortunately there are as yet no relatively inexpensive off the shelf >> implementations of the GPS carrier phase discipling technique available. >> The calculations involved for maximum performance are somewhat complex, >> however not too much computing horsepower should be required. >> > > The QL carrier phase GPSDO is unique and probably not > cost-effective. Sounds like it's a custom single-channel GPS > receiver designed from the ground up. If there were an easier > way surely someone would have done it in the past ten years. > > Yes $30,000 Euros or so is a little steep. Depends what you mean by easy. Vested interest in an existing receiver can lead to inertia. The other players seem wedded to using PPS disciplining, possibly because of all the existing equipment using it. Investigations into using multichannel carrier phase disciplining have been somewhat sporadic. Although single channel receivers employing carrier phase measurement have been successfully deploye
Re: [time-nuts] Software Sawtooth correction prerequisites?
Will do Likes like an interesting product line Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dr Bruce Griffiths Sent: Saturday, May 12, 2007 10:12 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Software Sawtooth correction prerequisites? Lester I have no idea you'll need to contact Acam direct. http://www.acam.de Bruce Lester Veenstra M0YCM K1YCM wrote: > What is the cost of the two channel pci system, if you happen to have the > price in hand. If not, I will ask direct. > > Full Name: Lester B Veenstra > Job Title: Communication Sys Des Engr Sr Stf > Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) > Company:Integrated Systems & Solutions > > Business Address: > > Lockheed Martin IS&S > PSC 45 Box 781 > APO AE 09468 > > Home Address Address: > > Dawn Cottage > Norwood, Harrogate > HG3, 1SD UK > > Telephones: > > Office 940-6456 > > Office +44-(0)1423-846-385 > > Home: +44-(0)1943-880-963 > > UK Cell +44-(0)7716-298-224 > > US Cell +1-240-425-7335 > > Jamaica+1-876-352-7504 > > > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of Dr Bruce Griffiths > Sent: Saturday, May 12, 2007 7:00 AM > To: Tom Van Baak; Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Software Sawtooth correction prerequisites? > > Tom Van Baak wrote: > >>> Define cheap. >>> You can already get essentially single chip TICs with a resolution (and >>> accuracy) better than 100ps for around 100 Euros or so. >>> >>> >> Has anyone in the group tried one of these? I would very >> much like to see the results. >> >> > > All except Xavier seem to have shied away from obtaining these on cost > grounds and the need to layout a 4 layer PCB. > Although the vendor does offer an evaluation system (External box plus > card plugs into PC with fat multiconductor SCSI type (but not SCSI > signalling)cable connecting the two), too expensive for general use but > perhaps useful for performance evaluation. > The above price was for an earlier version the later reduced cost higher > resolution version (range 5 nanosec - 4millisec) should be cheaper. > The range can easily be extended to years if required (using CPLD > counters (or even a PIC with built in counters - eg PIC18F4550) + > software+ 74AC164). > > Bruce > ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] H-Maser, but not on ebait...
Well I guess that is one traveling clock that will not sit on a first class seat next to Paul Wheeler! Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Scott Lacy Sent: Saturday, June 09, 2007 10:09 PM To: time-nuts@febo.com Subject: [time-nuts] H-Maser, but not on ebait... Since we're having a lively afternoon (or midnight for our Aussie members) on Time-nuts, and talking about buying and selling gear anyway, I think this is a good time to mention something I've been putting off for too long: An Oscilloquartz H-maser. For sale. I've put some details, pictures and the manuals here: http://www.arclightindustries.com/efos.html That page will get some more data over the next few days, and I'm sure there will be tons of questions to answer. I hope John will forgive the commercial post, but I figured my fellow Time-nuts would want to be the first to know about a loose maser. Thanks, Scott ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] GPIB on the HP3586
While I brought the (huge) maintenance manual with me, I seem to forgot the User manual for the Selective Level Meter HP-3586C. Would anyone have the HPIB programming string definitions available? Thanks Les M0YCM K1YCM Full Name: Lester B Veenstra PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] GPIB on the HP3586
And, true to Murphies law, found what I needed at w5jgv.com, just AFTER I released the query below! -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lester Veenstra M0YCM K1YCM Sent: Monday, June 11, 2007 9:33 PM To: 'Discussion of precise time and frequency measurement' Subject: [time-nuts] GPIB on the HP3586 While I brought the (huge) maintenance manual with me, I seem to forgot the User manual for the Selective Level Meter HP-3586C. Would anyone have the HPIB programming string definitions available? Thanks Les M0YCM K1YCM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] GPIB on the HP3586
Thanks Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Monday, June 11, 2007 9:49 PM To: time-nuts@febo.com Subject: Re: [time-nuts] GPIB on the HP3586 In a message dated 11/06/2007 21:34:34 GMT Daylight Time, [EMAIL PROTECTED] writes: While I brought the (huge) maintenance manual with me, I seem to forgot the User manual for the Selective Level Meter HP-3586C. Would anyone have the HPIB programming string definitions available? On its way to your own email address, approx 2MB pdf. If you want the complete user manual pdf I can send that but it's about 14MB and I think you'll find it on Didier's webs site anyway. regards Nigel GM8PZR ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Vectron oscillator data
>From VECTRON 229 osc with 7 pin Kovar feed through in circle similar to a tube base: 1 B+ (Oven) 2 N/C 3 N/C 4 B+ (Osc) 5 VCXO Supply 6 VCXO Input 7 return (Case) 73 M0YCM K1YCM Full Name: Lester B Veenstra Job Title: Communication Sys Des Engr Sr Stf Department: 6L01 Site Operations Collaboration and Reach-Back (SOCAR) Company:Integrated Systems & Solutions Business Address: Lockheed Martin IS&S PSC 45 Box 781 APO AE 09468 Home Address Address: Dawn Cottage Norwood, Harrogate HG3, 1SD UK Telephones: Office 940-6456 Office +44-(0)1423-846-385 Home: +44-(0)1943-880-963 UK Cell +44-(0)7716-298-224 US Cell +1-240-425-7335 Jamaica+1-876-352-7504 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Henk ten Pierick Sent: Tuesday, June 19, 2007 9:34 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Vectron oscillator data Hello all, Same question for the Vectron 224-8647-2 100MHz. Henk ten Pierick On Jun 19, 2007, at 12:43, Jeroen Bastemeijer wrote: > Dear All, > > Can someone provide me with the pin-out of a Vectron 244-4799-2 > oscillator? It has a SMA output and a DB-9 connector for power supply. > Other data (stability, supply voltage) is welcome as well! > > Thank you, best regards, Jeroen > > -- > Ing. Jeroen Bastemeijer > > Delft University of Technology > Department of Electrical Engineering > Electronic Instrumentation Laboratory > Mekelweg 4, Room 13.090 > 2628 CD Delft > The Netherlands > > Phone: +31.15.27.86542 > Fax: +31.15.27.85755 > E-mail: [EMAIL PROTECTED] > GPS: Lat N52.2 Lon E4.37157 Alt 46.2m > > > ___ > time-nuts mailing list > time-nuts@febo.com > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
