Re: [time-nuts] Racal-Dana 1992 switches
Bruce Rex, You're both right. 1.25E-10 was for 40.000 000 005 GHz and 7.5E-11 is for 40.000 000 003 GHz. My bad, Good sleuthing. Tom Tom Duckworth 510-886-1396 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Rex Sent: Wednesday, April 02, 2008 3:01 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Racal-Dana 1992 switches Bruce Griffiths wrote: Tom Duckworth wrote: Bill, I have attached a PDF of two methods we used at XL Microwave for adjusting the internal reference oscillators in our microwave counters. The second method (digital) was used to calibrate the internal reference time base of a 70 GHz microwave counter with an accuracy of parts in E-11. This digital method could be used to compare two GPSDOs, one to the other, and would probably yield greater resolution than trying to use a phase measurement on a counter due to jitter, internal noise, and stability issues in the count chain. This method proved to be fast, simple, stable, and superior to other methods we tried. Hope this helps. Tom Tom Duckworth 510-886-1396 Tom The first calculation at the bottom of the second page is incorrect the result should be: 1.25E-10 not 7.5E-11. Bruce The result was fine, but the measurement should have been 40.000 000 003 GHz. :-) -Rex ___ 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.
Re: [time-nuts] Adding prescaler to HP 5334B
Thanks, Rick. Bob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard (Rick) Karlquist Sent: Tuesday, April 01, 2008 8:05 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Adding prescaler to HP 5334B The diode limiter is to protect the C channel from getting burned out due to connecting a transmitter to it, etc. You don't need the limiter if you aren't worried about this. The detector gates off the counter when there is insufficient signal to count reliably. The detector is imperfect, and the counter may read garbage anyway, or may be blanked on a signal that would be countable. For the average time nuts user, you can leave out both of these features with no harm. I had to design them in for marketing reasons. Rick Karlquist 5334B Project Manager ___ 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.
Re: [time-nuts] Oncore batteries
Matthew, Don't pull off the batteries! The boards are populated differently for battery/non-battery uses. Your external battery will not be connected to the onboard RAM. That being said, not using batteries might be a good solution. First, the old lithiums currently on the receivers are probably on their last legs anyway. Secondly, as you mentioned, pulling power is a good easy way to reset the GT+ receiver to binary with all messages disabled. This is the way timing receivers are normally used because TTFF is not usually a concern, and it eliminates the headache of replacing batteries out in the field. Can you imagine every TDMA cell-site needing new batteries every 5-10 years? One last item - Even without a battery a VP will save its setup information through power cycles because the older Moto receivers such as the VP save this information in EEPROM. To default these receivers you need to explicitly send the binary default command. Randy Warner -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Matthew Smith Sent: Wednesday, April 02, 2008 7:10 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Connecting my Oncores Quoth randy warner at 2008-04-03 11:09... snip The battery can indeed cause some problems if you don't have the software necessary to reset the receiver to a known state. The simplest thing to do is get a copy of Rick Hambly's TAC32 at cnssys.com. TAC32 will light up just about any Moto receiver ever made no matter what state it is in. /snip Thanks Randy; I just downloaded TAC32 and it's got one of my catatonic GT+s talking to me now. I'll leave it to its devices for a while longer and then try the other one. I'm going to be mounting all the modules with interface and power supply boards and will be feeding backup power from an AA-size lithium battery. So, those on-board batteries will be coming OFF! If anything goes wrong then, I can just power down, pop out the backup battery (or unplug the module) and hopefully get back to a default state. Now I discover that I don't have a good sky view so think that I'll have to wait until the builder finally turns up (already 6 months late) and can get my antennas up on the ridge cap. Cheers M -- Matthew Smith Smiffytech - Technology Consulting Web Application Development Business: http://www.smiffytech.com/ Personal: http://www.smiffysplace.com/ LinkedIn: http://www.linkedin.com/in/smiffy ___ 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.
Re: [time-nuts] time-nuts Digest, Vol 45, Issue 7
There is a great line in the new (you'll get it shortly) Nut and Volts where someone writes in saying they finally bought a new computer only to realize there was no parallel port. They wanted to know how they were going to use their 3 printers connected via a switch. The answer fromNV was,you should become familiar with google (www.google.com). Seems like something you would write. That got me thinking, you could write a know it all column somewhere and use the Kindle to get all the answers. No work, all the glory...I should have thought of that. The Steve Martin movie is Bowfinger. The restaurant is http://www.bofingerparis.com/ It could all be just a story someone made up... m. [EMAIL PROTECTED] 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 [EMAIL PROTECTED] You can reach the person managing the list at [EMAIL PROTECTED] When replying, please edit your Subject line so it is more specific than Re: Contents of time-nuts digest... Today's Topics: 1. Re: Adding prescaler to HP 5334B (Robert Berg) -- Message: 1 Date: Thu, 3 Apr 2008 08:07:57 -0700 From: Robert Berg Subject: Re: [time-nuts] Adding prescaler to HP 5334B To: 'Discussion of precise time and frequency measurement' Message-ID: [EMAIL PROTECTED]@pobox.com Content-Type: text/plain; charset=us-ascii Thanks, Rick. Bob -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Richard (Rick) Karlquist Sent: Tuesday, April 01, 2008 8:05 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Adding prescaler to HP 5334B The diode limiter is to protect the C channel from getting burned out due to connecting a transmitter to it, etc. You don't need the limiter if you aren't worried about this. The detector gates off the counter when there is insufficient signal to count reliably. The detector is imperfect, and the counter may read garbage anyway, or may be blanked on a signal that would be countable. For the average time nuts user, you can leave out both of these features with no harm. I had to design them in for marketing reasons. Rick Karlquist 5334B Project Manager ___ 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 https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts End of time-nuts Digest, Vol 45, Issue 7 ___ 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.
