Re: [time-nuts] 5 MHZ PIC PPS Divider?

2008-04-12 Thread John Ackermann N8UR
ources. See my reply to Bruce below for more on what I'm trying to accomplish. Thanks! John David Forbes said the following on 04/11/2008 04:12 PM: > At 3:23 PM -0400 4/11/08, John Ackermann N8UR wrote: >> Has anyone come up with a 5 MHz input version of TVB's PIC divider?

[time-nuts] 5 MHZ PIC PPS Divider?

2008-04-11 Thread John Ackermann N8UR
Has anyone come up with a 5 MHz input version of TVB's PIC divider? I could use one... Thanks, John ___ 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 instructi

Re: [time-nuts] GPS noise reduction

2008-04-06 Thread John Ackermann N8UR
That also leads to a thought I've had -- if you have a pair of roughly comparable oscillators at say 5 MHz, what about combining their outputs in a mixer and using the 10 MHz sum output which (apart from noise added by the mixer) ought to be sqrt-2 better than either unit alone? John Tom Van

Re: [time-nuts] TAC32 & Z3801A

2008-04-04 Thread John Ackermann N8UR
The Z3801A doesn't talk native Motorola -- it has its own set of commands based on the SCPI protocol. So I don't think you'll have any luck using the Motorola-based programs to talk to it. John Bill Janssen wrote: > I was trying to get TAC32 to talk to my Z3801A, and no luck. I have > HP

Re: [time-nuts] TADD-1 six channel RF distribution amplifier

2008-03-28 Thread John Ackermann N8UR
Tom's unit had the bandpass filter installed, and as Bruce noted I've regretted ever putting the holes on the board for it -- my saying is that "every resonator is a thermometer"! The prototype that Tom tested without a filter had much better tempco, and I suspect that the filter-less production v

Re: [time-nuts] TADD-1 six channel RF distribution amplifier

2008-03-28 Thread John Ackermann N8UR
Steve said the following on 03/27/2008 09:35 PM: > I'm thinking about using the TAPR TADD-1 six channel RF distribution > amplifier to distribute the 10MHz output of my Trimble Thunderbolt to a > few pieces of test equipment. > > What does the TADD-1 do to the phase noise characteristics of its

Re: [time-nuts] anyone built a replacement antenna for a Spectracom 8170?

2008-03-26 Thread John Ackermann N8UR
I've used my Spectracom WWVB receivers with an active LF antenna (the AMRAD design) with very good results. At least here in Ohio, and after the WWVB ERP upgrade, it doesn't seem to take much of a wet noodle to get a good signal. John Scott Burris said the following on 03/26/2008 12:45 PM:

Re: [time-nuts] Buffering the 1pps output from a Z3801A

2008-03-26 Thread John Ackermann N8UR
Here's how I added 1 pps and 10 MHz TTL outputs to my Z3801A: http://www.febo.com/time-freq/gps/z3801a/mods/index.html John Peter Vince said the following on 03/26/2008 09:29 AM: > Bruce, et al, > > The 1pps output of an HP Z3801A and Trimble Thunderbolt is > only available (as far a

Re: [time-nuts] Wanted to buy or borrow -- RFTG-m-XO L106A

2008-03-17 Thread John Ackermann N8UR
ey worked well > again. Perhaps a similar problem with your RFTG. > > > Scott > > John Ackermann N8UR wrote: >> I'm not sure what's going on. I ran my XO/RB pair for 30 days, using >> the "official" interconnect cable with the monitoring so

Re: [time-nuts] Wanted to buy or borrow -- RFTG-m-XO L106A

2008-03-15 Thread John Ackermann N8UR
I'm not sure what's going on. I ran my XO/RB pair for 30 days, using the "official" interconnect cable with the monitoring software indicating no problems. I took phase data from the RB output via the TSC and fed it into Stable32 (by the way, with a 20 second timeout, the 30 day TSC data capture

[time-nuts] Wanted to buy or borrow -- RFTG-m-XO L106A

2008-03-15 Thread John Ackermann N8UR
I suspect the XO module in my RFTG setup is defective, so I'd like to find another one. It needs to be the "L106A" (not "B") version to mate with my -RB (L105A) unit. Anyone have one they'd like to sell? Or, failing that, one I could borrow to test in my system? Thanks! John [EMAIL PROTECTED]

[time-nuts] MVUS Frequency Measuring Test -- April 19, 2008

2008-03-15 Thread John Ackermann N8UR
The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to announce that our second MVUS Frequency Measuring Test will be held on Saturday, April 19, 2008. There will be two transmission periods, each on a single band: the first at 16:30 EDT (2030 UTC) on 20M, and the second at 17:30 EDT

[time-nuts] Slightly off-topic: How to take measurements at fixed intervals in Perl

2008-02-23 Thread John Ackermann N8UR
I've struggled for a while to figure out how to take readings at fixed intervals from my counters and other GPIB gear. The problem is that the time it requires to trigger and receive a measurement is non-zero and can vary from measurement to measurement. Trying to calibrate a proper delay is an e

Re: [time-nuts] No Echo

2008-02-23 Thread John Ackermann N8UR
Sylvain RICHARD said the following on 02/23/2008 08:59 AM: > In my case, most of the delay comes from my ISP (free.fr). Neville, just > do the same on your machine. > Please note that the usual caveat (is your server time set correctly?) > does not apply our case. There is also some queuing del

Re: [time-nuts] spectracom line taps

2008-02-18 Thread John Ackermann N8UR
jshank said the following on 02/18/2008 03:05 PM: > Jamie, > > If you have the Spectracom 8140 you need to use the line taps. With out > using the line taps you sinewave will not be symmetrically along 0 voltage, > that is the sine wave will all be positive voltage. I'm not certain about that;

Re: [time-nuts] spectracom line taps

2008-02-18 Thread John Ackermann N8UR
James R. Gorr said the following on 02/18/2008 12:18 PM: > I have a Spectracom 8140 frequency distribution amp. > I see on ebay there are line taps for this device. Do > I need the line taps? Or can I just use the 8140 as > is? What are the line taps supposed to do? I use the 8140T line taps w

Re: [time-nuts] No Echo

2008-02-15 Thread John Ackermann N8UR
Neville Michie said the following on 02/15/2008 05:14 PM: > Sorry for the double mailing, > I find it very disconcerting to not have my contributions sent back > to me. > I mail a response, but it seems not to have been sent, or there is a > big delay. > When I go to the archives I find it was

[time-nuts] Lucent RFTG-XO performance...

2008-02-03 Thread John Ackermann N8UR
Has anyone here done any performance measurements of the Lucent RFTG-XO unit? I am testing one now and getting extremely unimpressive results, and wonder if anyone else has looked closely at these things. What I'm seeing is almost flat ADEV in the low to mid 10s from 1 second out to 40,000 second

Re: [time-nuts] Clock Powers of Ten

2008-01-31 Thread John Ackermann N8UR
Very cool, Tom! John Tom Van Baak said the following on 01/31/2008 04:55 PM: > There are good clocks and bad clocks. Most need power, one > needs food, another runs all by itself. > > Take a trip across 15 orders of magnitude of clock performance: > > http://www.leapsecond.com/ten/ >

Re: [time-nuts] Z3801A normal and holdover performance

2008-01-30 Thread John Ackermann N8UR
Bruce Griffiths said the following on 01/30/2008 08:46 PM: > John Ackermann N8UR wrote: >> OK, I've finished a comparison of two Z3801As running in normal locked >> mode, and with one unit in holdover: >> >> http://www.febo.com/pages/oscillators/z3801a/index

Re: [time-nuts] HP5342A GPIB programming

2008-01-30 Thread John Ackermann N8UR
Matt Ettus said the following on 01/30/2008 08:25 PM: > I have an HP5342A with GPIB, and am having trouble getting a reading > out of the GPIB interface. It seems to work ok, and when I send it > commands with talk.exe from the KE5FX GPIB tools, it responds to the > command. But any time I query

[time-nuts] Z3801A normal and holdover performance

2008-01-30 Thread John Ackermann N8UR
OK, I've finished a comparison of two Z3801As running in normal locked mode, and with one unit in holdover: http://www.febo.com/pages/oscillators/z3801a/index.html John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.

Re: [time-nuts] Common-view GPS calibrations?

2008-01-28 Thread John Ackermann N8UR
Bruce Griffiths said the following on 01/28/2008 08:02 PM: > Would you like a copy of all the manuals, papers etc available on this > service? > They use a custom multichannel time stamp instrument at both ends. > This uses ramp interpolation of the clock to achieve resolution of > around 25ps or

[time-nuts] Common-view GPS calibrations?

2008-01-28 Thread John Ackermann N8UR
I was just looking at the NIST's frequency and time measurement services, where for a monthly fee that provide a box that will give you either frequency or time calibrations traceable to NIST. Both services use common-view GPS. Would it be feasible for the time-nuts to do their own common-view co

Re: [time-nuts] Soekris NET4521?

2008-01-27 Thread John Ackermann N8UR
Scott Newell said the following on 01/26/2008 11:25 PM: > Is the Soekris NET4521 an acceptable substitute for the '4501, > assuming I'd like to build a precision clock input? (As described at > http://www.febo.com/pages/soekris/) > I'm not sure. It uses the same processor as the 4501 (an AMD El

Re: [time-nuts] William Shortt's personal clock (No. 7) for auction

2008-01-26 Thread John Ackermann N8UR
That's pretty impressive performance... John Tom Van Baak said the following on 01/26/2008 06:28 PM: >> You might find this one interesting: >> >> http://www.christies.com/LotFinder/lfsearch_coa/LotDescription.aspx?intObjectID=5039672 > > Brooke, > > And this too (real data, different S/N)

Re: [time-nuts] Z3801A performance plots

2008-01-25 Thread John Ackermann N8UR
Very nice. Thanks! (I'll report when I have my holdover experiment finished in a few days.) John Tom Van Baak said the following on 01/25/2008 05:34 PM: >> Tom's plots at http://www.leapsecond.com/pages/z3801a-osc/ show 13 >> Z3801As running in unlocked mode, measured against one of his mo

Re: [time-nuts] Z3801A performance plots

2008-01-25 Thread John Ackermann N8UR
Mike, you did inspire me to do the follow-on experiment. I'm now measuring the two units again, but this time with the antenna on unit 2 (the not-as-good one) disconnected just at the start of the run. It'll take about 4 days to gather the same data as the other plots, so be patient. :-) John --

Re: [time-nuts] Z3801A performance plots

2008-01-25 Thread John Ackermann N8UR
; 73 - Mike > > > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 > > > > -Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of John Ackermann N8UR > Sent: Friday, January 25, 2008 9

Re: [time-nuts] Z3801A performance plots

2008-01-25 Thread John Ackermann N8UR
Sorry, I mistyped. Try this: http://www.febo.com/pages/oscillators/z3801a/ John Mike Feher said the following on 01/25/2008 08:41 AM: > John - > > Your link did not work for me. Thanks - Mike > > > > Mike B. Feher, N4FS > 89 Arnold Blvd. > Howell, NJ, 07731 > 732-886-5960 > > ___

[time-nuts] Z3801A performance plots

2008-01-25 Thread John Ackermann N8UR
I realized that there hasn't been data posted about how the Z3801A performs when operating normally in GPS lock mode -- TVB's excellent page focuses on the oscillators when they are free running. So, I just did an experiment measuring two well aged Z3801As in GPS lock against one another. No huge

Re: [time-nuts] Generation of very stable 10.001MHz for heterodyne freq measurement

2008-01-25 Thread John Ackermann N8UR
Anders Time said the following on 01/25/2008 07:23 AM: > What is the best way to generate a very stable 10.001MHz(low E-13 or > -110dBc/1Hz) to be to do high resolution heterodyne(Allan deviation) > measurements? > Using DDS? > Using PTS 500 or 250 synth and divide? Using HP 8662A and divide? > Som

Re: [time-nuts] 20logN was Re: phase noise questions (long)

2008-01-24 Thread John Ackermann N8UR
Christophe Huygens said the following on 01/24/2008 04:55 AM: > Another unrelated topic, I seem to get emails from time-nuts only > sporadically, and with sender time-nuts-bounces. However I > don t have any bounce status... Does anybody else see this > phenomenon. It is a bit irritating to have t

Re: [time-nuts] Wenzel, Inc article on low-noise oscillators

2008-01-23 Thread John Ackermann N8UR
By the way -- Despite the discussion in the article about the voltage regulator, TVB and I have discovered that the Wenzel ULN oscillators are very sensitive to external factors like power supply noise. When I was testing with an aged bench supply that apparently had some dried up electrolytics,

Re: [time-nuts] Ovenaire OSC 49-61C

2008-01-23 Thread John Ackermann N8UR
Geoff Blake wrote: > Hi, > > I know this has been asked before - but I haven't found an answer > in the archives. > > Has anybody a spec on an Ovenaire OSC 49-61C, ex HP 8568A. > > Although I haven't yet, I should be able to determine the pin-out > from the service manual also the rudiments of t

Re: [time-nuts] RFTG-m-RB

2008-01-19 Thread John Ackermann N8UR
James R. Gorr said the following on 01/19/2008 07:41 PM: > What I am trying to accomplish is provide a reference > for my HP 3586C. I want to try my hand at the FMT in > February. > > I have a set of the Lucent RFTG-m-XO and RFTG-m-RB. > > My options are use the RB as stand alone or use the XO >

Re: [time-nuts] RFTG-m-RB

2008-01-19 Thread John Ackermann N8UR
Bruce Griffiths said the following on 01/19/2008 05:20 PM: > James R. Gorr wrote: >> I always assumed frequency references should be sine >> waves. If that is not the case, I guess I can use >> this for a reference for other equipment? And if a >> square wave is just fine, could I use a clock-blo

Re: [time-nuts] Slightly OT: inexpensive USB analog-digital converter?

2008-01-18 Thread John Ackermann N8UR
Didier Juges wrote: > Be careful that if you do not isolate the A/D converter analog circuits from > the USB ground, you may create all sorts of nasty ground loops with the > computer. When dealing with power supplies, it's always best to be isolated. > I do not know enough about USB to know if it

Re: [time-nuts] Slightly OT: inexpensive USB analog-digital converter?

2008-01-18 Thread John Ackermann N8UR
Hal Murray wrote: > Alternatively, if the supply is floating, you can put the sense resistor in > the ground lead, but you still need a good amplifier to make the signal big > enough for an ADC. Sorry... my earlier response blew past the issue of whether you have enough voltage developed for t

Re: [time-nuts] Slightly OT: inexpensive USB analog-digital converter?

2008-01-18 Thread John Ackermann N8UR
Hal Murray wrote: >> (My goal is to add digital voltage and current monitoring to some >> older bench power supplies.) > > Measuring voltage is simple. If the input range is too big, you need a few > resistors. If it's small, you lose a few bits from the top of the A/D. Add > an op-amp if yo

Re: [time-nuts] PM-to-AM noise conversion

2008-01-18 Thread John Ackermann N8UR
John Miles wrote: > Occam, the guy with the Razor. > > The one who keeps telling me not to overcomplicate things. :-P Our little local group of geeks here in Dayton has, as one of its mottos, "No Problem Is So Large Or Complicated That It Can't Be Over-engineered." John

Re: [time-nuts] Slightly OT: inexpensive USB analog-digital converter?

2008-01-17 Thread John Ackermann N8UR
Tom Van Baak wrote: > I like these: > > http://www.labjack.com/labjack_u3.php > http://www.labjack.com/labjack_u12.php > > See also: > http://www.labjack.com/ > http://www.labjack.com/compare.php Thanks, Tom! Their OEM version of the U3 looks like it'll do the trick, and at $79 it's not too p

[time-nuts] Slightly OT: inexpensive USB analog-digital converter?

2008-01-16 Thread John Ackermann N8UR
I'm looking for a couple of inexpensive sensors with a couple of channels of 10 or 12 bit ADC and ideally a USB interface (emulating a serial device). I've done a bit of googling and everything I've found has been either fairly pricey (well over $100 each) or cheap, but with only 8 bits resolution

Re: [time-nuts] Prologix, Linux and bash

2008-01-16 Thread John Ackermann N8UR
Hi Patrick -- Off the top of my head, I can't help with the syntax, but I wanted to mention that sometimes under Linux a USB device will assume different device names depending on how many times (and how recently) it's been plugged and unplugged. So, it's possible the Prologix may answer on t

[time-nuts] How to measure regulator noise?

2008-01-06 Thread John Ackermann N8UR
I'm experimenting with some low noise regulators, and want to do some meaningful measurements to compare them (and hopefully compare to published specs). I have an HP 3561A FFT analyzer, which can probably be beaten these days by a sound card, but has the advantage of absolute calibration and GPIB

Re: [time-nuts] sync computer clock ticks

2008-01-04 Thread John Ackermann N8UR
Michael Di Domenico wrote: > I've used NTP for years, but i was under the impression that it is not > able to synchonize the clocks below 1 or 2 seconds. Can you point me > towards a specific article that speaks about the configuration > parameters to get ntp sync'd that low? Hi Michael -- PC h

Re: [time-nuts] xtal oscillator phase noise

2008-01-01 Thread John Ackermann N8UR
Mike Feher said the following on 01/01/2008 09:47 AM: > Yes, that is what I figured regarding the 12V. For me, it has more or less > been a rule of thumb, but, I think at 10 MHz the best you could do, due to Q > and transistor noise and gain, was about - 155 dBc/Hz at about 100 Hz from > the carrie

[time-nuts] 5061 Long Time Constant

2007-12-14 Thread John Ackermann N8UR
I have two 5061As that are (for the moment at least) working. Both have replacement FTS tubes, and both have the retrofitted 10811A OCXO. One is a fairly late chassis, while the other is much older. One difference is that the long time constant switch on the older one is a slide switch in the bo

Re: [time-nuts] cancel remove

2007-12-14 Thread John Ackermann N8UR
Peter Sabersky said the following on 12/14/2007 03:39 PM: > Pls remove me from this list > Just a reminder because I've seen a few of these lately -- there's a link at the bottom of every message that will take you to the time-nuts info page. From there you can manage your subscription, includin

Re: [time-nuts] Big Picture View

2007-12-12 Thread John Ackermann N8UR
Keith E. Brandt, M.D. wrote: > John, > That's a good start towards answering my question. Given my set-up of > GPS referenced NTP server, how would I integrate a frequency > reference into the system? You'd replace the crystal oscillator on the motherboard with a more stable reference. The TAP

Re: [time-nuts] Big Picture View

2007-12-12 Thread John Ackermann N8UR
Keith E. Brandt, M.D. wrote: >As a relative newbie to the who time-nut scene, I'm still working on >the big picture of how all the hardware fits together. I've >successfully put together a FreeBSD box with a Garmin 18 LVC as an NTP >server and am getting consistent microsecond accur

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

2007-12-11 Thread John Ackermann N8UR
Hal Murray said the following on 12/11/2007 05:57 PM: >> As great as GPSDO are, the problem with using them in a portable >> environment is the time it takes to do a survey and then get to final >> lock; mountain-toppers may not be in one place long enough. > > What if you use a navigation GPS un

Re: [time-nuts] need recomendation for a portable 10mhz reference oscilator

2007-12-11 Thread John Ackermann N8UR
Hal Murray wrote: > I'm picturing an open hill top at night with clear skies so there would be > lots of radiation cooling. Of course, with an open hill top, GPS recption > would be easy. As great as GPSDO are, the problem with using them in a portable environment is the time it takes to do a

Re: [time-nuts] John Vig elected President of IEEE

2007-12-10 Thread John Ackermann N8UR
That's one advantage of using PDF in that kind of situation. The "slide show" presentation isn't quite as nice as with PowerPoint or OO, but it's much more independent of the environment on the machine. And, of course, OO has a very nice "Export to PDF" option available for all its modules (write

Re: [time-nuts] Super stable BVA Quartz resonators... BVA??

2007-12-07 Thread John Ackermann N8UR
Brian Styles said the following on 12/07/2007 07:15 PM: > There's quite a bit of guff on the "Oscilloquartz" website - especially > if you find your way to the OXCO 8607-B datasheet (pdf). [ . . . ] > They've made over 10,000 of them. Anyone know what they're charging...? Very rough numbers, b

Re: [time-nuts] Super stable BVA Quartz resonators... BVA??

2007-12-07 Thread John Ackermann N8UR
Michael Baker wrote: > I have found out how a BVA resonator is fabricated, but > I have not discovered what the acronym "BVA" stands for. > > I suspect that the "B" in "BVA" may refer to Raymond Besson > the discoverer of the BVA quartz resonator, but I > have not been able to confirm that. > >

[time-nuts] Austron Loran Receiver Cheat Sheets

2007-12-05 Thread John Ackermann N8UR
For those of you with Austron 2100F or 2100T receivers, I finally got around to putting up very terse instructions for acquiring lock and (for the 2100T) syncing to UTC, as well as decoding the keypad and error status messages. http://www.febo.com/time-freq/loran/austron-2100F-setup.html http://ww

Re: [time-nuts] Of rubidium life and piggy-bank anemia....

2007-12-01 Thread John Ackermann N8UR
John Ackermann N8UR said the following on 12/01/2007 04:07 PM: > I use the 100 second average for two reasons: first, it results in a > somewhat better resolution than the 2ns native of the HP-5334A TIC, > which may or may not be meaningful in the ADEV calculation given the PPS > no

Re: [time-nuts] Of rubidium life and piggy-bank anemia....

2007-12-01 Thread John Ackermann N8UR
Bruce Griffiths said the following on 12/01/2007 03:36 PM: >>> It takes a 100 second average of each PPS source >>> sequentially; I end up with six log files, each with a tau of >>> 600 seconds: CS1-GPS, CS2-GPS, RB1-GPS, CS1-CS2, CS1-RB1, and CS2-RB1. > This technique creates the issue of how

Re: [time-nuts] Of rubidium life and piggy-bank anemia....

2007-12-01 Thread John Ackermann N8UR
Didier Juges said the following on 12/01/2007 12:56 AM: > Maybe quasi-simultaneously is adequate, using a switch to sample the 3 pairs > in rotation. > > The HP59307A can be used for that under GPIB control. If anybody's interested, I have a perl script (running under Linux, using the linux-gpib

Re: [time-nuts] Of rubidium life and piggy-bank anemia....

2007-11-29 Thread John Ackermann N8UR
Hi Mike -- Most modern Rbs, and particularly the small telecom ones (which is what most of the <$500 ones are) have a quite long lamp life; I haven't heard of any of them failing because of lamp burnout. However, note that those Rbs tend to have only modest short term stability and phase noise.

Re: [time-nuts] Chronometer contest sponsored by IEEE Spectrum

2007-11-29 Thread John Ackermann N8UR
David Forbes wrote: > At 10:42 AM -0500 11/29/07, [EMAIL PROTECTED] wrote: >> IEEE Spectrum, the magazine of the Institute of Electrical and Electronic >> Engineers, is issuing a D-I-Y challenge that may be of interest to the >> members of this group. The goal is to build the most accurate possible

Re: [time-nuts] HP 8924C's on ebay

2007-11-29 Thread John Ackermann N8UR
Jeff Mock said the following on 11/29/2007 01:32 AM: > There seem to be a bunch of HP8924C's up on ebay for about $1500. It's > intended function is for CDMA testing, but it seems to be a pretty > general RF communications tester. Even if you don't care about the CDMA > stuff, it's a 1GHz spect

Re: [time-nuts] OT: Prologix GPIB and HP3478A...The Answer!

2007-11-28 Thread John Ackermann N8UR
Daun -- Guess who you see frequently who has a Prologix you might able to borrow... John Daun Yeagley said the following on 11/28/2007 08:45 PM: > Well, I have a 3478A, but unfortunately not a Prologix. If I get my hands on > one > I could add a data point. > Personally, I think there is a

Re: [time-nuts] Wavecrest 2070C manual?

2007-11-21 Thread John Ackermann N8UR
Thanks to all who replied! I now have several copies of the manual :-) John Henk ten Pierick said the following on 11/21/2007 12:56 PM: > Hi Jon, > > I have send what I have off-list. > > Henk > > > On Nov 21, 2007, at 0:26, John Ackermann N8UR wrote: > >>

[time-nuts] Wavecrest 2070C manual?

2007-11-20 Thread John Ackermann N8UR
The UPS man left my nifty new DTS-2070C analyzer today. The unit looks like it's new in box, but it's been robbed of the manual (and SMA shorts and extenders that are supposed to accompany it). I know several folks here have one of these guys. Anyone have a scanned manual? Thanks, John __

[time-nuts] More administrivia

2007-11-18 Thread John Ackermann N8UR
It appears (fingers crossed, knock on wood) that the spurious headers at the top of list messages have finally been resolved by the latest Debian update I applied yesterday. I never did figure out which of the five programs in the febo.com mail system was causing the problem, but I'm glad that it'

Re: [time-nuts] Time-Nuts Archive?

2007-11-18 Thread John Ackermann N8UR
Dr. David Kirkby said the following on 10/15/2007 05:02 PM: > The reason Google does not index it is probably has something to do with > the following line I see in the HTML: > > Following up an ancient message, but your sysadmin is getting back in the swing of things after six plus weeks

Re: [time-nuts] Datum 9390 Rb phase noise

2007-11-17 Thread John Ackermann N8UR
John Miles said the following on 11/17/2007 09:06 PM: > Well, I bought the other Datum 9390 that was for sale at the time Mike > posted this message (eBay 260177272556), and it's certainly an impressive > box of stuff for $150. There is an Efratom Rb module, a couple of power > supplies, and a bun

Re: [time-nuts] LORAN-C antenna

2007-11-13 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Didier Juges said the following on 11/12/2007 11:02 PM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > I get this (see picture) with the spectrum analyzer and my wire antenna. > That looks a lot c

Re: [time-nuts] LORAN-C antenna

2007-11-13 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Didier Juges said the following on 11/12/2007 10:48 PM: > I have tried to listen with my HP 3586 and my 80 meter antenna (which is > actually about 20m long and 50 feet up at one end, 30 feet up at the other > end), but I have

Re: [time-nuts] LORAN-C antenna

2007-11-12 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY You're probably pretty close to the Jupiter, Florida station. A piece of wire will probably do the trick. John Didier Juges said the following on 11/12/2007 07:11 PM: > ); SAEximRunCond expanded to false > Errors-To: [EM

Re: [time-nuts] LORAN-C

2007-11-12 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY For what it's worth, I've never felt that the frequency error display on the 2100 series was all that reliable, even when you use the longest averaging time. When I've used LORAN for frequency measurement, I hook an A/D on the

Re: [time-nuts] Administrivia: The Spam Button

2007-11-10 Thread John Ackermann N8UR
-Original Message- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > Behalf Of John Ackermann N8UR > Sent: Saturday, November 10, 2007 5:35 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Administrivia: The Spam Button > > Aft

Re: [time-nuts] Administrivia: The Spam Button

2007-11-10 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY [EMAIL PROTECTED] said the following on 11/10/2007 06:25 PM: > I lost access to my Teknet manual download account a while back, the > explanation being that AOL had blocked them from sending to any AOL user. > When they comp

[time-nuts] Administrivia: The Spam Button

2007-11-10 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY >From Your Humble SysAdmin: I just received a bad-boy message from AOL relating to the "Mini Magnetic Sensor" email that was posted to the list this afternoon. These messages usually result from an AOL subscriber hitting the "

[time-nuts] October MVUS Frequency Measuring Test Results

2007-11-06 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY The results of the first MVUS Frequency Measuring Test are now available at http://www.febo.com/pages/mvus-fmt/index.html (click on "October 2007 Results"). There are also pages at that URL describing how we generated and meas

[time-nuts] MVUS FMT Results -- Update

2007-11-03 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Just wanted to let folks know that we were actually planning to publish results for the MVUS Frequency Measuring Test that was held on Oct. 13/14. We received 19 entries, some with as many as 15 (out of 18 possible) readings, a

Re: [time-nuts] Digital Scopes - suggestions

2007-10-24 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hal Murray said the following on 10/24/2007 03:47 AM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > > I'm looking for a digital scope. Is there some obvious model(s) that I > should keep an ey

Re: [time-nuts] Fury interface board.

2007-10-22 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY I'd be interested in one, George. John [EMAIL PROTECTED] said the following on 10/22/2007 05:39 PM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Hello everyone, > > I was hacking away at

Re: [time-nuts] Time-Nuts Archive?

2007-10-15 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Thanks for pointing that out, David. I'll see if I can get Mailman to change that robot tag (it's automagically created). John Dr. David Kirkby said the following on 10/15/2007 05:02 PM: > ); SAEximRunCond expanded to false

[time-nuts] Final reminder -- Frequency Measuring Test tomorrow!

2007-10-12 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Last reminder -- the first Midwest VHF/UHF Society Frequency Measuring Test will be held tomorrow, Oct. 13 (EDT). Here are the key details: 1. Two runs: 1430 EDT (1830 UTC Saturday) and 2130 EDT (0130 UTC Sunday). 2. Nomin

Re: [time-nuts] TV sync

2007-10-11 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Jeffrey Pawlan said the following on 10/07/2007 12:03 PM: > All larger TV stations use Cs standards. What you don't know is that the FCC > assigns SLIGHTLY different scan frequencies to each station on the same > channel in a c

Re: [time-nuts] Improving the stability of crystal oscillators

2007-10-10 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY [EMAIL PROTECTED] said the following on 10/10/2007 02:39 PM: > BTW: I wonder how much effect thermistor and resistor-bridge aging as well > as opamp offset drift has on the long term aging of typical OCXO's since it > will

Re: [time-nuts] Improving the stability of crystal oscillators

2007-10-10 Thread John Ackermann N8UR
[EMAIL PROTECTED] said the following on 10/10/2007 02:17 PM: > In a message dated 10/10/2007 11:13:21 Pacific Daylight Time, [EMAIL > PROTECTED] > writes: > >> We first built a small proportional heater circuit that we could shove >> in next to the crystal, and that worked OK. We finally fou

Re: [time-nuts] Improving the stability of crystal oscillators

2007-10-10 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY This is getting off topic (because it's far to practical!) but hanging heaters on crystals is a time-honored activity for hams. Many of the surplus FM rigs for VHF and UHF that we obtained from the likes of Motorola, GE, RCA, e

Re: [time-nuts] Help with LPRO 101

2007-10-09 Thread John Ackermann N8UR
Geraldo Lino de Campos said the following on 10/09/2007 05:42 PM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > New to the list, I got a used LPRO 101 and developed a GPS-based > counter to check accuracy of calibration. I found it is almost on the > spot, freq=9.99

Re: [time-nuts] Fury GPSDO orders

2007-10-09 Thread John Ackermann N8UR
Me me me!!! John [EMAIL PROTECTED] wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Hello guys, > > we are ready to start shipping the Fury units out to you. We have sent > PayPal payment information to the following members, please let me know if I

[time-nuts] Reminder -- FMT on October 13

2007-10-03 Thread John Ackermann N8UR
*** Note important updates in this information *** The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to announce that the first annual MVUS Frequency Measuring Test will be held on Saturday, October 13, 2007. There will be two transmission periods: the first at 14:30 EDT (1830 UT

[time-nuts] 5370B frequency counter capability

2007-09-25 Thread John Ackermann N8UR
I was looking at the wrong plot when I mentioned the noise floor of my 5370B in frequency counter mode; blame my temporary mono-vision after having had some eye surgery! If you look at http://www.febo.com/time-freq/hardware/5370B/index.html *properly*, you'll see that the actual noise floor is abo

Re: [time-nuts] FMT on October 13

2007-09-25 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Didier Juges said the following on 09/24/2007 09:40 PM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > I guess it depends on signal to noise ratio. With reciprocal counters, you > only need one pe

Re: [time-nuts] FMT on October 13

2007-09-25 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Tom Van Baak said the following on 09/24/2007 08:57 PM: > I would think this is especially true for non-local frequencies, > such as one received over the air. I'll leave it to you FMT > guys to comment on the magnitude of degr

[time-nuts] FMT on October 13

2007-09-24 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY The Midwest VHF/UHF Society (located in Southwest Ohio) is pleased to announce that the first annual MVUS Frequency Measuring Test will be held on Saturday, October 13, 2007. There will be two transmission periods: the first at

Re: [time-nuts] Symmetricom splitter delay

2007-09-21 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Scott Mace said the following on 09/21/2007 06:14 PM: > Has anyone measured the delay through a symmetricom 090-58537-01 4-port > splitter? > The spec sheet says ~40ns, which seems kind of high. Last spring we measured a two-

Re: [time-nuts] E1938 phase noise

2007-08-28 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Richard (Rick) Karlquist said the following on 08/28/2007 12:27 AM: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > E1938A phase noise should be similar to 10811, > possibly even a little better fa

Re: [time-nuts] Basic Stratum 1 question

2007-08-02 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Jared Morrisen wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > Hi, > > I am having a debate with our CIO. He wrote in a memo about timing: > > *Local hardware is to be considered Stratum

[time-nuts] Test message

2007-07-28 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Sorry for the intrusion; testing some mail system upgrades that I'm hoping might solve the spurious-header problem. John ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go

Re: [time-nuts] HP 5370B low frequency modulation

2007-07-28 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] John Ackermann N8UR said the following on 07/28/2007 09:58 AM: > I don't know that I've ever seen any crimp connectors that don't have a > sleeve between the coax and the dielectric. Maybe I've just been l

Re: [time-nuts] HP 5370B low frequency modulation

2007-07-28 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Didier Juges said the following on 07/28/2007 09:39 AM: > One problem with crimping coax cables is that crimping the braid is usually > done against the plastic (term used generically) insulation between the > center conductor and th

Re: [time-nuts] Time may not exist

2007-07-28 Thread John Ackermann N8UR
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] I'm surprised that no one has come forth with the apposite quote from the Hitchhiker's Guide to the Galaxy: "Time is an illusion. Lunchtime, doubly so." John Didier Juges said the following on 07/28/2007 09:29 AM: > ); SAExim

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