Re: [time-nuts] HP 5372A troubleshooting

Adrian, Thanks very much! I had no idea those scans were available for the 5371A. I'll download them at once. Regards, Morris --- From: Adrian Morris, you might want to download the 5371A service manuals which contain schematics. The 5372A being an

[time-nuts] MicroPulse L1/L2 Surveying Antenna

Does anyone have any details on the above antenna? Part Number is: 90LL122300-2 and it has a sticker on it saying it is a Global Hawk Asset, it has a big set of choke rings (about 35 cm across) and looks as though it might have been designed to be mounted flush on an aircraft body. I'm doing

Re: [time-nuts] Valpey-Fisher VFT22H OCXO Output

Waveform is similar to that produced by an inductive input low pass filter with all but the first section inoperative when driven by a square wave input. Bruce On Saturday, January 30, 2016 09:33:45 AM Bob Camp wrote: > Hi > > Unless it’s a really weird termination impedance, it’s broke. The

Re: [time-nuts] moon bounce for synchronization

Ooh! Ooh! Not only a 5245 with a 5265 voltmeter plug-in but a 5360 Computing Pig! Great picture, thanks for posting it. Jeremy N6WFO On 1/30/2016 6:16 AM, jimlux wrote: This month's historical picture from JPL http://beacon.jpl.nasa.gov/historical-photo-of-the-month This atomic clock was

Re: [time-nuts] GPS jumps of -13.7 us?

Cisco as a boundary clock is susceptible to error. Ive seen under conditions of cpu-bound high traffic load (bgp event, high levels of broadcast) the ptp process has a lower interrupt priority on the scheduler and therefore prone to more jitter when it comes to acting as a master. As the Cisco

Re: [time-nuts] moon bounce for synchronization

HP 5245M to be exact. There's one in my rack. Different plugin, same time base. Still works at 5 GHz. On Saturday, January 30, 2016, Jeremy Nichols wrote: > Ooh! Ooh! Not only a 5245 with a 5265 voltmeter plug-in but a 5360 > Computing Pig! Great picture, thanks for posting

Re: [time-nuts] moon bounce for synchronization

On 1/30/16 10:43 AM, Jeremy Nichols wrote: Ooh! Ooh! Not only a 5245 with a 5265 voltmeter plug-in but a 5360 Computing Pig! Great picture, thanks for posting it. Jeremy N6WFO I like how none of the push buttons in the panel below the counters have labels, either on the faceplate or on the

[time-nuts] 10 MHz phase comparison using Bruel & Kjaer type 2971 phase meter

Hi All, while i was looking for an hp k34-59991A phase comparator on ebay in order to make some long term measurements of frequency drift of a dut against a reference (by logging the analog output of the meter) i found and bought a Bruel & Kjaer type 2971 phase meter instead of the hp. It is a

[time-nuts] Looking for any information on a Leica MX 9400R

Found very little. http://petelancashire.com/gallery/main.php?g2_itemId=5273 12 channel receiver and a few other bits of information. 4 RS-232 interfaces all come out of a DC-37 (the same profile as the DB-25 but 37 pins) -pete ___ time-nuts mailing

Re: [time-nuts] Valpey-Fisher VFT22H OCXO Output

Looks like the output of a simple single ended emitter follower that isn't being loaded properly. Try again, but this time with a 50 ohms load. -Chuck Harris Logan Cummings wrote: Hi All, Curious what could give this waveform (attached) - I presume this is not correct output for this

Re: [time-nuts] Valpey-Fisher VFT22H OCXO Output

Hi Unless it’s a really weird termination impedance, it’s broke. The SMA is a pretty good indication that it *should* work into a 50 ohm load. The only other possibility is that your probe is taking the load far enough off of 50 ohms to mis-tune the output filter. I’d set the scope to 50 ohm

[time-nuts] moon bounce for synchronization

This month's historical picture from JPL http://beacon.jpl.nasa.gov/historical-photo-of-the-month This atomic clock was used at the Goldstone Time Standards Laboratory in 1970, to synchronize clocks at Deep Space Network stations around the world. This master clock was accurate to plus or

Re: [time-nuts] Valpey-Fisher VFT22H OCXO Output

Hi Logan, My guess is there is some second or third harmonic energy present. I have observed the very same thing on another oscillator. Look at it with a spectrum analyzer and see what kind of harmonic energy is there. BillWB6BNQ Logan Cummings wrote: Hi All, Curious what

[time-nuts] Valpey-Fisher VFT22H OCXO Output

Hi All, Curious what could give this waveform (attached) - I presume this is not correct output for this oscillator (surplus/salvage from Harris Constellation receiver). Frequency looks OK with +2V EFC but output looks like neither sine nor any CMOS I've seen into 10Mohm (first

Re: [time-nuts] GPS jumps of -13.7 us?

Le 29 janv. 2016 22:03, "Eric Scace" a écrit : > >I have an idle curiosity as to whether the erroneous UTC correction propagated into any high-speed trading platforms in the financial markets in a what that caused a disruption. I cannot speak for others but on our plateform,

Re: [time-nuts] moon bounce for synchronization

I was a lot of times at the other side of the link, the receiving end, those days (and I also have no hair). The procedure was cumbersome: you have to climb to the roof to manually point a small parabolic antenna to the moon using handwheels and a rifle scope. The antenna had an hourangle

Re: [time-nuts] 10 MHz phase comparison using Bruel & Kjaer type 2971 phase meter

Luca, I am using a HP3575a phase and gain meter good to 1Hz-13 MHz but easily goes to 15 MHz. It delivers a dc voltage that feeds a DATAQ 4 cnl USB A/D coverter and chart program $25. Its been working very well for comparing references long term. Just suggesting the 3575 as a possible alternative.

Re: [time-nuts] moon bounce for synchronization

If you look closely at the picture, you'll see that it's an "L," but there isn't quite enough resolution to say whether it's a 5245L or a 5248L. Probably 5245L because most 5248s had the hi-accuracy (for the era!) standard and were sold as 5248M. Jeremy On 1/30/2016 11:47 AM, Norm n3ykf

Re: [time-nuts] 10 MHz phase comparison using Bruel & Kjaer type 2971 phase meter

Hi Luca, look here: http://www.clmt.de/service-manuals/ 73 KJ6UHN Alex On 1/30/2016 12:49 PM, Luca Dal Passo wrote: Hi All, while i was looking for an hp k34-59991A phase comparator on ebay in order to make some long term measurements of frequency drift of a dut against a reference (by

Re: [time-nuts] moon bounce for synchronization

The one in the rack is a 5245L actually. You need to blow the photo up to see. First thing I looked for as I wondered if they used the higher spec timebase model but the L timebase was probably driven from a separate external source. Still have two Ms and an L here- AND still looking for a

Re: [time-nuts] moon bounce for synchronization

Hat tip to the 8405A Vector Voltmeter in the other rack. Yeah. Great photo! On Jan 31, 2016, at 7:43 AM, Jeremy Nichols wrote: > Ooh! Ooh! Not only a 5245 with a 5265 voltmeter plug-in but a 5360 Computing > Pig! Great picture, thanks for posting it. > > Jeremy > N6WFO >

Re: [time-nuts] moon bounce for synchronization

eb4...@gmail.com said: > Back to the Control Room you contact the transmitting station (I think it > was DSS12) by voice to insure that they have the station manned and > transmitting, and began to operate the "thing". The transmission were > specific for each receiving station, because all the

Re: [time-nuts] moon bounce for synchronization

And on the top left, a fan-fold paper printer for the data. Imagine handling all of that data manually instead of getting it in a disk file. Bill Hawkins -Original Message- From: Jeremy Nichols Sent: Saturday, January 30, 2016 12:43 PM To: time-nuts@febo.com Subject: Re: [time-nuts]

Re: [time-nuts] moon bounce for synchronization

On 1/30/16 4:27 PM, Hal Murray wrote: eb4...@gmail.com said: Back to the Control Room you contact the transmitting station (I think it was DSS12) by voice to insure that they have the station manned and transmitting, and began to operate the "thing". The transmission were specific for each

[time-nuts] HP Z3801A Internal Power Supply issues

My Z3801A began to die over the last few days. It would work for an hour or two then produce a receiver error and communications problems. Turn it off, let it sit awhile, back on and it would start the survey and then begin to recover. Tonight it finally went dead with high current on the main

Re: [time-nuts] Looking for any information on a Leica MX 9400R

Made a mistake, the I/F connector is a DB-25. But still 4xRS-232 (maybe?) On Sat, Jan 30, 2016 at 11:16 AM, Pete Lancashire wrote: > Found very little. > > http://petelancashire.com/gallery/main.php?g2_itemId=5273 > > 12 channel receiver and a few other bits of

Re: [time-nuts] Looking for info on a Leica MX 9400R

I have a couple of Leica MX 9400Rs in storage at work along with the Leica manuals. What are you looking for specifically. Bob ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] HP Z3801A Internal Power Supply issues

power supply runs for a while, output current increases, but voltage stays correct -> problem is in the load circuit, load circuit working for a while load current increases, but it recovers after pause -> look for some tantalum capacitor in the load circuit, they recover often a few times