[time-nuts] combining same frequency for redundancy
About 50 years ago I ran into a Frequency Division Multiplexer that used a redundant master frequency system. I beleive they combined the same frequency for the master oscillator, but it was something like a special hybrid combiner. I remember that they used a phase angle of 135 degrees - and then if they lost one signal, the power went down by 3 db on the main pilot. Anybody no any details on this type of system ? What I am looking for is to have an input to a distribution amplifier where I can connect and disconnect two different inputs and keep the output systems up and running. FREE ONLINE PHOTOSHARING - Share your photos online with your friends and family! Visit http://www.inbox.com/photosharing to find out more! ___ 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] HP53131A Fan/Blower
Has anyone found a suitable replacement or a source for the fan/blower in the HP53131A ? I have talked to Agilent and the fan/blower is not a seperate item, its part of the power supply board. TRY FREE IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if5 Capture screenshots, upload images, edit and send them to your friends through IMs, post on Twitter®, Facebook®, MySpace™, LinkedIn® – FAST! ___ 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] A small piece on HP's hydrogen maser in 1968
In the back of my head, I beleive that project red shift did fly, but they dumped the hydrogen masers to use brand new lighter weight and much smaller rubidiums. GET FREE SMILEYS FOR YOUR IM EMAIL - Learn more at http://www.inbox.com/smileys Works with AIM®, MSN® Messenger, Yahoo!® Messenger, ICQ®, Google Talk™ and most webmails ___ 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] HP5370B Dead Time in TI Mode
Greetings, I have run some time interval test and it did not quite calculate correctly. I used a TADD2 that is configured for 2 outputs at 100 Hz, 2 outputs at 10 Hz, and two outputs at 1 PPS. The HP5370B clock output was used as the input for the TADD2. The output of the TADD2 was feed to both time interval inputs using a tee. I am using a ProLogix GPIB/USB adapter and hyperterminal in windows to capture the data. The object of the test was to make a baseline noise floor measurement. The 5370B manual shows there must be a minimum of 330 microseconds between measurements. If the unit is put in the time interval binary mode via the GPIB, the unit can output up to a 6 Khz rate on measurements. The 5370B manual does not state what the instrument can output on the GPIB, in normal use (meaning, not in the time interval binary mode - just plain talk mode). I made some measurements using 100 hz to both inputs and in one hour, the data file shows only 51437 samples. This equates to 14.288 samples per second. I made some measurements using 10 Hz to both inputs and in one hour, the data file shows 35988 samples. This basically works out to 10 samples per second, as expected. Knowing the results at 100 hertz, how can one tell a program such as Stable32 or Plotter about the dead time between measurements ? Or would it be best to keep the inputs at a maximum rate of 10 PPS, and say thats the limits in the normal TI mode ? GET FREE SMILEYS FOR YOUR IM EMAIL - Learn more at http://www.inbox.com/smileys Works with AIM®, MSN® Messenger, Yahoo!® Messenger, ICQ®, Google Talk™ and most webmails ___ 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.
