Re: [time-nuts] HP 3586B Power Supply Failures

> So I went through the entire instrument and came up with a list of all the > Sprague TVA electrolytics that I am going to replace as they are dated coded > 1983. > > So two questions. One, can I safely double the capacitance of the filter > capacitors? (I plan on using the 105C 10K hour high r

[time-nuts] HP 3586B Power Supply Failures

List, The other day I had my second HP 3586B power supply board smoked.  It burned both the PC board traces and the connector on the motherboard so badly it will have to be replaced.  Also an inch or so of one trace on the mother board but it looks like it will be repairable.  Fortunately I hav

[time-nuts] HP 3586B GPSDO

List, I saw a picture somewhere where someone added a GPSDO to the back of a HP3586 but it didn’t give any details. My question:  I have the Ovenaire model 42-16 high stability oscillator but it has only four wires to the base.  Can one apply EFC to it or does one need another oscillator?  My

Re: [time-nuts] Frequency Counter Errors

Thanks to all that replied. The problem is my 5328A reference input amplitude, and possibly the input module. I lowered the reference amplitude to 4.9v p-p and the accuracy got better, but not the same as the 5372A. So I suspect that the input front end may have something wrong with it. I have a

Re: [time-nuts] WWVB phase plots

> Okay. A little 3586B hacking was required, but here are some wide-band > results: Thanks very much. This data shows the full-bandwidth WWVB signal very well. Attached are some plots and an octave script. The first plot shows the demodulated WWVB w

Re: [time-nuts] Frequency Counter Errors

The 5328A is manually switched. 30kHz to 10 MHz 1V RMS min, 5VP-P max into 1kohm. Mike On 3/21/2012 7:39 PM, Tom Knox wrote: It must be that one counter has not switched to ext ref. It has been a while with both these counters, does the 5328A auto switch to ext ref? The 5372A does have an

Re: [time-nuts] Frequency Counter Errors

It must be that one counter has not switched to ext ref. It has been a while with both these counters, does the 5328A auto switch to ext ref? The 5372A does have an auto ref switch and will acept 1,2,5,and 10MHz+/-1% at 1-5VPP . A quick way to check that ext ref is seen by the 5372A is during

Re: [time-nuts] DTV tuner chip usable for GPS front end?

On 3/21/12 9:58 AM, David wrote: On Wed, 21 Mar 2012 16:40:27 -, "David J Taylor" wrote: I suppose there is limited interest in homebrew GPS receivers given how cheap the fully integrated chipsets are. However, just noticed the below tuner chip intended for DTV, actually lists GPS L1 as a

Re: [time-nuts] Frequency Counter Errors

> The frequency is always at least >200 to 300Hz off between the two counters > and I don't know > which one to believe. You know the "man with 2 clocks" problem. > > Anyone have any idea what may be causing this? What are you measuring? Are both of the counters' inputs set to 50 ohms, and if so

Re: [time-nuts] DTV tuner chip usable for GPS front end?

On 3/21/12 9:17 AM, beale wrote: I suppose there is limited interest in homebrew GPS receivers given how cheap the fully integrated chipsets are. However, just noticed the below tuner chip intended for DTV, actually lists GPS L1 as an applicable frequency. A TV Tuner USB stick using this chip

Re: [time-nuts] Frequency Counter Errors

Jerry, My guess is that the amplitude of the reference signal may be on the ragged edge of what the counters require- either just barely adequate, or much too "hot" and being distorted. Also, check to see if the source and load impedances are matched. I once corrected a similar problem by insert

Re: [time-nuts] Frequency Counter Errors

Yes, first try the Rb with their internal timebases. Got the PRS10? Nice Rb reference: I had one (brand new) last month for only one week... On Thu, Mar 22, 2012 at 1:11 AM, jmfranke wrote: > First, try counting the Rd reference frequency output. If one reads right > you are halfway to solving t

Re: [time-nuts] Frequency Counter Errors

What happens if you feed the 10MHz external clock to the input. If you measure the reference frequency you should get 10MHz dead-on exact even if the reference is not exactly 10MHz. If you don't get this, the counter has a problem. I have seem my two counters disagree when I tried to measure

Re: [time-nuts] Frequency Counter Errors

First, try counting the Rd reference frequency output. If one reads right you are halfway to solving the problem. John WA4WDL -- From: "Jerry Mulchin" Sent: Wednesday, March 21, 2012 8:05 PM To: Subject: [time-nuts] Frequency Counter Errors I

[time-nuts] Frequency Counter Errors

I have a question for the collective group. I have a HP 5372A and a HP 5328A frequency counters. Both counters use the same PRS-10 Rubidium frequency standard driving a 6 channel reference distribution amplifier to each counters reference input port. The problem is this; When I measure the same

Re: [time-nuts] Experience with THS788 from TI?

Two suggestions: How about using an off-the-shelf Wavecrest counter? These have a 0.8ps resolution, and typically have a noise floor of around 3ps when averaging. They certainly can do 10ps single shot. There is a DTS-2050 on Ebay now for $700: item number 120647180882 You can't get much

Re: [time-nuts] OT: calibration

Their prices seems to be in the same ball park as the Austin lab (TesCom) that we use at work. Does anyone know anyone that offers 'hobbyist' rates? I could easily spend $1000 getting my equipment cal'd, but certainly can't justify the budget. Mike On 3/20/2012 11:52 PM, Joseph Gray wrote:

Re: [time-nuts] Experience with THS788 from TI?

Hi, The NIM Negative pulse is indeed problematic when trying to interface to FPGA logic! The solution I have used in the past is a board based around a Maxim MAX9601[1] acting as a comparator on the incoming NIIM pulse, and configuring the output for connection to the FPGA. Judging by the result

Re: [time-nuts] Experience with THS788 from TI?

Bob Camp writes: > Hi > > Ok, for a legit 12 ps with 0.1 ps drift and 200 mega samples per second - > not to many alternatives. The FPGA stuff will get you to 50 to 100 ps on the > same basis this gets you to 12 ps. They will get you to 20 to 40 ps on a > good day - sort of the way this chip gets

Re: [time-nuts] Experience with THS788 from TI?

Jim Williams wrote an appnote on how to do this with ~100ps resolution with a small number of parts. I think it was mentioned before and should be in the time nuts archives.. His circuit can be modified without much effort for higher resolution. bye, Said In a message dated 3/21/2012

Re: [time-nuts] broadband MPX signal stereo

We had the SMBV100 (full options loaded) on a demo for very few days and I used it as a GPS simulator. The menus I have used didn't let me figure out what kind of operating system was underneath... On Wed, Mar 21, 2012 at 9:49 PM, Florian Teply wrote: > Am Thu, 15 Mar 2012 22:08:12 +0100 > schri

Re: [time-nuts] Experience with THS788 from TI?

Hi Ok, for a legit 12 ps with 0.1 ps drift and 200 mega samples per second - not to many alternatives. The FPGA stuff will get you to 50 to 100 ps on the same basis this gets you to 12 ps. They will get you to 20 to 40 ps on a good day - sort of the way this chip gets 8 ps. The FPGA will do it at

Re: [time-nuts] broadband MPX signal stereo

Am Thu, 15 Mar 2012 22:08:12 +0100 schrieb Azelio Boriani : > Yes, there is people who have what in the past was expensive test > equipment and now can be bought by 1/10 of the original price. The > problem is that you need someone who can record 2 seconds of a signal > that is slightly beyond the

Re: [time-nuts] Experience with THS788 from TI?

Bob Camp writes: > Hi > > Are you after 12 ns or 12 ps? > Bah, yes, my bad: picoseconds is the relevant timescale here. Cheers, - Ben ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo

Re: [time-nuts] IOTECH 488 EPROM

Prologix would be happy to host your samples, or link to them, from our website. Our customers will benefit much from your work. Abdul www.prologix.biz supp...@prologix.biz -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Hal Murray Sen

Re: [time-nuts] Wednesday AM Update: LORAN-C Reception on Cape Cod

Stan if you are talking about the austrons I know how to set them. Could call you if thats easier On Wed, Mar 21, 2012 at 10:10 AM, Stan, W1LE wrote: > > Don, you are absolutely correct, Dana is in Indiana and not Illinois. > > Austron offered a model 2084 LF Multicoupler, with 1 antenna input a

[time-nuts] Wednesday AM Update: LORAN-C Reception on Cape Cod

Don, you are absolutely correct, Dana is in Indiana and not Illinois. Austron offered a model 2084 LF Multicoupler, with 1 antenna input and 4 outputs. Could be AC or DC powered, with peak and spherics indicator lamps, and 8 each tunable notch filters from 70 thru 130 KHz that can be individua

Re: [time-nuts] DTV tuner chip usable for GPS front end?

http://www.funcubedongle.com/ but perhaps not fast enough for you. Or not wide enough in this case. The FunCube technical FAQ says the bandwidth is about 80 KHz as it is designed for narrow band reception only and accessed as a standard USB sound device. I do not quite understand how 96 Ksam

Re: [time-nuts] Antenna Position

The NTP servers use the Meinberg down-converter antennae and therefore not compatible with the Odetics unit. I had the antennae, but don't have any splitter/combiners so that was the only solution. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com]

Re: [time-nuts] Antenna Position

I tried inside as a first pass, but no good. The roof is tiled, but has a metal clad foam insulation layer on all walls and ceiling. Rob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Poul-Henning Kamp Sent: 21 March 2012 15:59 To: Dis

Re: [time-nuts] DTV tuner chip usable for GPS front end?

On Wed, 21 Mar 2012 16:40:27 -, "David J Taylor" wrote: >> I suppose there is limited interest in homebrew GPS receivers given how >> cheap the fully integrated chipsets are. However, just noticed the below >> tuner chip intended for DTV, actually lists GPS L1 as an applicable >> frequency

Re: [time-nuts] DTV tuner chip usable for GPS front end?

I suppose there is limited interest in homebrew GPS receivers given how cheap the fully integrated chipsets are. However, just noticed the below tuner chip intended for DTV, actually lists GPS L1 as an applicable frequency. A TV Tuner USB stick using this chip is available for $20, and some SD

Re: [time-nuts] Experience with THS788 from TI?

On Wed, 21 Mar 2012 11:51:53 -0400, Ben Gamari wrote: >On Wed, 21 Mar 2012 09:44:14 -0500, David wrote: >> I am surprised it is not more accurate and precise. Even old discrete >> designs can get down to 10ps or better. I wonder what market it is >> for where space is at that much of a premium

Re: [time-nuts] Experience with THS788 from TI?

Hi Are you after 12 ns or 12 ps? Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Ben Gamari Sent: Wednesday, March 21, 2012 12:18 PM To: David; Discussion of precise time and frequency measurement Subject: [time-nuts] Experience w

Re: [time-nuts] Antenna Position

And in any case, with four receivers, wouldn't a single aerial and a splitter be more economical and save on feeder costs? Mind you, having an eight way splitter as I do does tend to encourage gps proliferation :^) Dan ___ time-nuts mailing list --

Re: [time-nuts] WWVB BPSK Receiver Project?

Looks like this bounced as I sent from the wrong address. Better late than never. On Wed, 14 Mar 2012 15:46:48 -0700, Chuck Forsberg WA7KGX N2469R wrote: > Asus has a $30 Xonar PCI soundcard that should do the job. > I have two of the the more expensive pci-e versions. Some motherboards > can

[time-nuts] Experience with THS788 from TI?

On Wed, 21 Mar 2012 09:44:14 -0500, David wrote: > I am surprised it is not more accurate and precise. Even old discrete > designs can get down to 10ps or better. I wonder what market it is > for where space is at that much of a premium. > Out of curiosity, would you happen to have an example

Re: [time-nuts] LORAN-C Reception on Cape Cod

Hi Unless they picked it up and moved it, Dana is in Indiana not Illinois :)... Bob -Original Message- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Stan, W1LE Sent: Tuesday, March 20, 2012 10:45 AM To: Discussion of precise time and frequency measurem

[time-nuts] DTV tuner chip usable for GPS front end?

I suppose there is limited interest in homebrew GPS receivers given how cheap the fully integrated chipsets are. However, just noticed the below tuner chip intended for DTV, actually lists GPS L1 as an applicable frequency. A TV Tuner USB stick using this chip is available for $20, and some SDR

Re: [time-nuts] Antenna Position

In message <003e01cd0751$ded32f60$9c798e20$@btinternet.com>, "Rob Kimberley" wr ites: >As I couldn't mount the antennae on the roof, I had to get creative. What kind of roofing do you have ? You can get pretty good results under the roof as long as it is not metalic or to thick ceramics. --

Re: [time-nuts] Experience with THS788 from TI?

13ps resolution at 200Msps sampling rate and real 15.8Msps output data throughput? not too many around :) Regards, Javier El 21/03/2012 15:44, David escribió: I am surprised it is not more accurate and precise. Even old discrete designs can get down to 10ps or better. I wonder what mark

Re: [time-nuts] Experience with THS788 from TI?

I am surprised it is not more accurate and precise. Even old discrete designs can get down to 10ps or better. I wonder what market it is for where space is at that much of a premium. On Wed, 21 Mar 2012 14:47:28 +0100, "Heinzmann, Stefan (ALC NetworX GmbH)" wrote: >I just discovered that TI m

[time-nuts] Experience with THS788 from TI?

Hi all, I just discovered that TI makes a TDC chip called THS788, see http://www.ti.com/product/ths788 for more info. Interesting specs, but rather expensive. Has anyone from the list had a chance to experiment with this device? Cheers Stefan ___ tim

Re: [time-nuts] IOTECH 488 EPROM

Do not forget that BlackBox sold Converters and Controllers that are identical internally to the IOTech boxes. The EPROMs can also be swapped between these two. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -Original Message- From: "J. L. Trantham" Se

[time-nuts] Antenna Position

All, There have been numerous discussions on antennae position in the group, so I thought the following might be interesting to both old and new to T&F. I've recently had a small extension to the house built which is now my office/workshop. Living in a conservation area in the Peak District in th

[time-nuts] Solar Storms - GPS World Article

Interesting article in GPS World...

Re: [time-nuts] WWVB phase plots

On Mar 20, 2012, at 4:18 AM, Peter Monta wrote: > John, if you're reading this, would your receiver be capable of > recording with wider RF bandwidth? Okay. A little 3586B hacking was required, but here are some wide-band results: __