Re: [time-nuts] GPSDO Question
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY If you use the HP Oscillator in your GPSDO, you can then use the 10 MHz output as an external reference for your counter. I picked up a 10 MHz distribution amp and use the same GPSDO to act as external reference on several instruments. Regards, Dick, W1KSZ Tom Clifton wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I have gathered everything I need to assemble a GPS Disciplined Oscillator. I have the Brooks Shera controller assembled, am about 99% done on the linear power supplies for +/- 5V, 12V supplies and a separate 24V oven heater supply. The GPS Engine is purring away happily with a good active antenna - spewing NMEA data and 1pps to anything willing to listen to it. The HP-10811 oven is sitting happily in a working 5328A counter that I'm willing to cannibalize, but do I need to? Is there any reason why I shouldn't put the controler in the 5328 case so I can use it as a counter as well as timing source? 73 - Tom in St. Louis Got a little couch potato? Check out fun summer activities for kids. http://search.yahoo.com/search?fr=oni_on_mailp=summer+activities+for+kidscs=bz ___ 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. -- 73, Dick, W1KSZ ___ 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] E1938A oscillator pinning
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I have one of these E1938A's. Where is this site you are referring to ? Thanks, Dick, W1KSZ Bruce Griffiths wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY [EMAIL PROTECTED] wrote: Thanks Bruce, I hooked +12V and +5V up to it, but there is no heater current, and no LED's go on. There is however a small current into the +12V (90mA) and the 10.0MHz are being generated with a significant error since the crystal is at room temp. Wonder what I am doing wrong? bye, Said Said Look at the Z3815A and the E1938A on TVB's website and note the subtle difference between the E1938A installed in the Z3815A which only has a single DAC and the other E1938A which appears to have 2 DACs. Which E1938A version do you have? Bruce ___ 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. -- 73, Dick, W1KSZ ___ 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] E1938A oscillator pinning
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Thank you Bruce Griffiths wrote: ); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Dick, W1KSZ wrote: I have one of these E1938A's. Where is this site you are referring to ? Thanks, Dick, W1KSZ Dick E1938A: http://www.leapsecond.com/museum/e1938a/ Z3815A: http://www.leapsecond.com/museum/z3815a/ Bruce ___ 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. -- 73, Dick, W1KSZ ___ 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] Building a DC Block Thingy....
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Google a 7805 device and all will be well. 73, Dick, W1KSZ Jason Rabel wrote: I have a NTS-200 on the way, but one thing about them is their GPS power output is 12V instead of the usual 5V. I really didn't want to modify the board any in an irreversible fashion so I was hoping to build an inline coupler that I could block / sink the 12V current. I have a Symmetricom SmartSplitter, and I know that *should* do the job as long as a lower numbered port is supplying power, but I really don't want to take the accidental risk of sending 12V to my antenna. Doing the math to sink 25ma of current would require a 480 ohm resistor... That should make the receiver happy and think all is well. But that's as far as my knowledge goes. What size capacitor would I need to use? Do I need to add an inductor in series with the resistor? Jason ___ 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. -- 73, Dick, W1KSZ ___ 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] 5 MHz from 10 MHz
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] I have several 10 MHz sources that are locked to GPS. I just acquired an HP 8640B that requires a 5 MHz reference input. Other than building up something, are their any commercial devices that will give me a 5 MHz output from a 10 MHz source ? Thanks, -- 73, Dick, W1KSZ ___ 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] NIST frequency doubler
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Where does one find this circuit ? Thanks, Dick, W1KSZ [EMAIL PROTECTED] wrote: In a message dated 7/9/2007 01:59:46 Pacific Daylight Time, [EMAIL PROTECTED] writes: It just an RF bypass capacitor to ground. This circuit was embedded in a very small section of a much larger paper, so its difficult to find. You may even have read the paper and not have noticed the mixer circuit. The resistor from the centre tap to ground is selected so that the peak drain current is around 28mA or so when the RF is applied RF input ~ 13dBm. Input transformer 1:4 turns ratio (or thereabouts) centre tapped secondary. Output transformer 2:1 turns ratio (or thereabouts). RF bypass capacitor depends on input frequency typically 100nF or so. Bruce Hi Bruce, nice circuit. Many questions: I wonder how well it works to get a 5MHz source up to 10MHz? Also, would you have recommendations on the transformer part numbers? (MiniCircuits, MaCom, etc)? I think the transformers are probably key to getting good phase noise (preventing them from saturating, crosstalk, etc). Do you have a suggestion on who makes the best (lowest-noise) JFets? Where could we find the original paper's PDF? Lastly, how much fundamental attenuation would you expect from such a circuit? Thanks! Said ** See what's free at http://www.aol.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. -- 73, Dick, W1KSZ ___ 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] Was Tracor 527A manual...now Tracor 527E Manual
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Now if I had the password . 73, Dick, W1KSZ [EMAIL PROTECTED] wrote: G'Day All, I have copied a scan of a Tracor 527A manual to Didier Juges's site ftp.ko4bb.com It is ~13MB, file name 527A_op_serv_manual.pdf I hope that is OK Didier? Regards Scott P.S. If you need it in a hurry I can mail and/or copy some where else for you. Hi Scott and All Many thanks Scott for the 527A manual. It was only when downloading it that I discovered a 527E manual in my archives, of similar size, that I must have downloaded some time ago and forgotten about. I'm now also uploading that one to Didier's site, should be finished in about 10 minutes, 23:50 UK time. Both can be found in his upload folder for now. regards Nigel GM8PZR ___ 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. -- 73, Dick, W1KSZ ___ 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] another Ebay mixup
The answer is simple ... Packing = $$$, right off the bottom line. Since most, if not all electronics on e-Pay is sold as-is, the seller has no reason to be concerned with the item arriving safely. Only his conscience, which, sadly, in the case of most sellers is non-existent. Don't blame the UPS Store, he only packs with the $$ the seller gives him. 73, Dick, W1KSZ Hal Murray wrote: Don't know why it's so difficult for folks to overpack. Worst case, one can have it professionally packed at MailBoxes etc. or the like. What's their batting average? Do they recognize heavy instruments and/or do anything special when they see handles? -- 73, Dick, W1KSZ ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
[time-nuts] VECTRON CO-247 Oscillator
Does anyone have any info (datasheet ?) on this oscillator ? Thanks, Dick, W1KSZ ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
