[time-nuts] HP8648 Series
Hello, I have posted questions about the HP8748A/B/C/D series of RF generators on the Keysight forum and also on the HP/Agilent group but the answers have been slim. So I am wondering if there is anyone from HP on the group that worked on these units or knows someone who did. I have a unit that a resurrected (8648C) that had a bad battery and a bad A10 module. It appears that the unit is in calibration but when I turn the RF on the display on the bottom right switches from RF OFF to PULSE. The unit does not have the pulse option installed and is not indicated that there ever was on on the \ instrument option label. I have the service manual and there is a rather lengthy method to run Windoze based software to report the installed options but if I read the manual correctly any change to the option list (if you write the data back) clears the calibration data requiring a complete re-calibration of the instrument, something I would rather not do. So if anyone out there has any hacks out there to fix this I would greatly appreciate any info. Sam W3OHM ___ 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] Link for WWVB PSK Remover by Paul WB8TSL and group folder
I set up a folder on my PogoPlug device which can be used by Time-Nuts members to upload and download files and documents. It is suggested that users zip project files with descriptive names. As long as there are no bandwidth issues I will leave this link up for the groups use. Please do not put any files there that you want to keep private or files that you do not have a right to post for public access. Please file this link away for future use. http://ppl.ug/ysoCRmlPKuY/ Best regards, Sam W3OHM Owner and Moderator LeCroy_Owners_Group on Yahoo! Groups ___ 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] Linked-in Emails
Hello, I am sorry for the email traffic that Linked-in has generated. Somehow it picked up every email address in my email list. My appologies, Sam ___ 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] Tracor 599J Mods?
Does anyone know if there are any mods for these receivers for when WWVB changes their modulation format? Is the WWVB change a done deal? It makes no sense to me to change this format as most people that carry a cell phone don't need a watch (nor wear one) anymore, much less a WWVB enabled watch. Sam W3OHM ___ 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] Conformal Coating
For conformal coating I recommend Humiseal Acrylic 1B73 in aerosol. You can also get it in brush form. I believe that Chemtronics used to offer acrylic coating as well, maybe even re-packaging the Humiseal product. I don't know if there is a source for small quantities of Humiseal but it is a fine product. I have also used Krylon clear acrylic that you can get at Wall-Mart in a pinch. The acrylic coatings I have found are better for HiZ circuits that have requirements for low-leakage. Consult the can for solvents and make sure that what you are coating are compatible with Toluene, Ketones, Acetone, etc. be careful around connectors as the coating will wick into connectors as the 1B73 is a fairly low viscosity. You can also get Humiseal formulations 1B38 and 1B66 which are also Acrylics but are brush on and require a one gallon minimum purchase. The shipping cost for a gallon is almost as much as the product due to the requirement that it be shipped as a hazardous material (flameable). The acrylics can be dissolved with MEK or any of the solvents I have listed above. You can remove a small amount with a Q-Tip. The Humiseal product also has a UV indicator in it that glows blue under a black light so you can check coverage. I have tested Humiseal Acrylic on probably 1000+ PCB's and it has yet to fail me. It is also easy to rework and re-coat after repairs. You can also get polyurethane coatings but I do not recommend them since they are more difficult you use, not as easy to remove and have better performance for HiZ and RF circuits. Good luck and let us know how you make out. Sam W3OHM http://www.hmcelectronics.com/product/Chemtronics/CTAR12 On Mon, May 14, 2012 at 7:31 PM, time-nuts-requ...@febo.com wrote: Send time-nuts mailing list submissions to time-nuts@febo.com To subscribe or unsubscribe via the World Wide Web, visit https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts or, via email, send a message with subject or body 'help' to time-nuts-requ...@febo.com You can reach the person managing the list at time-nuts-ow...@febo.com When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: Why are 1PPS signals so skinny? (Jim Hickstein) 2. Re: Why are 1PPS signals so skinny? (Azelio Boriani) 3. Re: wwvb weak on east coast especially when the pre-amps under wa... (Michael Blazer) 4. Re: wwvb weak on east coast especially when the pre-amps under wa... (Azelio Boriani) 5. Re: Why are 1PPS signals so skinny? (Michael Blazer) 6. Re: Why are 1PPS signals so skinny? (Bob Camp) 7. Re: wwvb weak on east coast especially when thepre-amps under wa... (Alan Melia) -- Message: 1 Date: Mon, 14 May 2012 18:18:20 -0500 From: Jim Hickstein j...@jxh.com To: time-nuts@febo.com Subject: Re: [time-nuts] Why are 1PPS signals so skinny? Message-ID: 4fb192bc.4060...@jxh.com Content-Type: text/plain; charset=ISO-8859-1; format=flowed On 2012/05/14 18:02, time-nuts-requ...@febo.com wrote: https://assist.daps.dla.mil/quicksearch/ is the search site for military standards. Hmm. Doesn't find MIL-TGDBP-41. I got this from my (now late) great uncle, Bob Sedgwick -- who was to hydraulics what I am to computers, only he has a number of patents. Some smart-aleck at Wright Field, as it then was, put this on a drawing, and it went without comment for quite a while until someone tried to look it up. This escalated to a bird colonel, who then tracked down the miscreant. It stands for Make It Like The G-D Blueprint For Once. -- Message: 2 Date: Tue, 15 May 2012 01:21:26 +0200 From: Azelio Boriani azelio.bori...@screen.it To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: Re: [time-nuts] Why are 1PPS signals so skinny? Message-ID: CAL8XPmOc8cLJ3aGBcqJsJB=fbw5xtq-_fy54r9eddudux+a...@mail.gmail.com Content-Type: text/plain; charset=ISO-8859-1 Maybe the correct number is MIL-STD-188-115? On Tue, May 15, 2012 at 1:18 AM, Jim Hickstein j...@jxh.com wrote: On 2012/05/14 18:02, time-nuts-requ...@febo.com wrote: https://assist.daps.dla.mil/quicksearch/ is the search site for military standards. Hmm. Doesn't find MIL-TGDBP-41. I got this from my (now late) great uncle, Bob Sedgwick -- who was to hydraulics what I am to computers, only he has a number of patents. Some smart-aleck at Wright Field, as it then was, put this on a drawing, and it went without comment for quite a while until someone tried to look it up. This escalated to a bird colonel, who then tracked down the miscreant. It stands for Make It Like The G-D Blueprint For Once. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe,
[time-nuts] WWVB test Sunday/Monday
Turn on your Tracor 599J's and K's *NOTICE*** *NIST Radio Station WWVB will be conducting a test of a phase modulation scheme beginning at 0130 UTC, Sunday 15 April until 1400 UTC, Monday, 16 April 2012. Most WWVB-controlled clocks and watches will be not be affected. Laboratory quality phase-locked and phase-tracking receivers may lose lock on the WWVB signal during the test. Questions and concerns regarding the test may be directed to the Broadcast Manager John Lowe, l...@nist.gov, or 303-497-5453. * * * ___ 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] WWVB - Response to Question posed to John Lowe
I sent the following to John Lowe of the NIST regarding the WWVB change proposals. His comments follow. Dear Sir, I just read your whitepaper on the new modulation scheme proposed for WWVB. It seems that you and the other authors of this paper have addressed the concerns of people that use WWVB solely for use with wall clocks and the like. Have you done a study to see how the alteration of the modulation scheme will affect those users that use WWVB for frequency standardization with WWVB receivers like those manufactured by Tracor, Symetricom and the like? I am sure that you must be aware of the widespread use of these venerable receivers. Do you have solutions or a work around so that those products will remain useable? It seems that a huge percentage of time users get their time from their Cell or iPhone or even their internet connected computers. Few people I know actually have WWVB clocks.Those that I know have been happy with the way they work today. Many people do not even wear watches these days. We have already given up LoranC. I recently pulled my very expensive receiver out of the rack as it is now a useless paper weight. Why change something that has been working so well for frequency users for many decades? I know that everyone wants to push GPS but in my opinion it is prudent to have a back up plan. After all WWVL has been gone for many years. If WWVB makes this change there will not be a usable VLF service for frequency use. Is this change up for comment or is it a done deal? Sincerely, Sam H. Reaves III Response: Thank you for your comments. We are working on making an interface that will keep these devices operational. While it is true that there are WWVB frequency reference devices out there, no manufacturer has made or supported these devices in years. They are all considered obsolete by their own manufacturers. It is estimated that over 12 million radio receive clocks and watches have been sold in the US. The new scheme will allow new devices to be constructed that can receive the frequency also. I will add your name to my list to be contacted when we have a work-around. Thank you So I gather from this they are working on something, but no details were given. Sam ___ 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] Cisco ADP-30RB Power Supply Use with TBolt
Hello all, I have a couple of these supplies that I plan to use with the TBolt. From what I can gather from searches on the internet the RO pin between the two grounds on the power connector is a remote turn on which is enabled by grounding this pin. Would someone please confirm that for me? Thanks, Sam ___ 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] WWVB Modulation Tests
Is there anyone that had a Tracor 599J or K on line when the new modulation test was going on? Does anyone know when the next test is to be performed? Sam ___ 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] Xtendwave
WWVB It seems that a commercial venture is driving this. Probably with all of the research at taxpayer expense. See: http://www.xtendwave.com/HD%20Time.pdf also www.extendwave.com ___ 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] WWVB New Modulation Scheme Compatibility
I guess that will mean that my bullet proof Tracor 599J will become a paper weight. I have a couple of units that were surplussed years ago from the USNO. Great receivers. Sam W3OHM ___ 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] Any TBOLT units for sale?
Does anyone have any Trimble Thunderbolt units for sale? Please reply off list. Sam W3OHM ___ 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] HP5370
Hello Norm, Do you still have the HP5370 for sale? Thanks, Sam W3OHM ___ 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] Symetricom CSAC
Hello, Does anyone have any experience with the Symetricom Chip Scale Atomic Clock? Seems interesting. http://www.businesswire.com/news/home/20110118005182/en/Symmetricom-Announces-General-Availability-Industry%E2%80%99s-Commercially-Available-Chip Sam ___ 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] FE5680A
Hello Group, I just bought four of the FE5680A's that have the standard configuration Pin 1+15, Pin 2 Gnd, Pin 3 Lock, Pin 4 +5V Pin 5 Gnd, Pin 6 1pps?, Pin 7 10MHz, Pin 8 TX, Pin 9 RX. I have a LED with a 330 ohm current limiting resistor on pin 3 (the 74ACT240 can sink up to 24mA and I am well below that) for the lock indicator. All of my units lock and produce 10MHz although the 1pps never switches. I can not get any of the units to communicate using the DB-9 connections. I scoped the receive data into the unit all the way to the microcontroller. The RS232 and TTL levels for the data look perfect as well as the timing for 9600-N-8-1. However the unit never transmits any data.I scoped this all the way to the micro as well. Not a pulse spike or anything. Has anyone determined what the second serial interface is for? It seems to me that it would not make any sense for FE to install the RS232 port if it could not be used. Any hints? Thanks Sam W3OHM ___ 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
Count me in for one. Sam W3OHM ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
