Re: [time-nuts] HP 10544A Repair

Been there and experienced it all to often. To tweak or not is the question. "Are you feeling lucky?" Regards Paul WB8TSL On Mon, Feb 29, 2016 at 1:50 PM, Mark Sims wrote: > Not to mention that a lot of pots that have been sitting at the same > setting for years tend to

Re: [time-nuts] Effect of the Antenna Delay in setting in Z380!A

Dave wrote: For those of who might care I would assume that actually taking the coax > and measuring the delay at 1.5GHZ would be better than relying on the > manufactures published specs for velocity factor. I was going to set up > and measure the delay with a signal generator and good

Re: [time-nuts] GPS Outage

On 02/29/2016 11:31 AM, Martin Burnicki wrote: Hal, Hal Murray wrote: martin.burni...@burnicki.net said: Strange that at least 3 independant firmware trees/development teams should chose the same magic wk860. I don't find it strange. If the next firmware version is based on the previous

Re: [time-nuts] HP 10544A Repair

Howdy All, This thread has split into a couple, but I’ll try to respond here to the various things. Based on how this crystal warms up, it does appear that it is a BT type crystal, as it warms up frequency goes up, and as it gets hotter eventually turns around and heads downhill again. I’ve

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi On some parts the spur shows up in the 40 to 80 Hz range. That pretty much rules out the line frequency. Bob > On Feb 29, 2016, at 5:04 PM, Gregory Muir wrote: > > Not sure if I am missing something here or not but an early mention was made > regarding synching the

Re: [time-nuts] Cheap GPSDO's

Below is a message Said asked me to forward to the group: Gents, While I haven’t posted here for a while, I have been following Time Nuts. One recent post caught my attention, and here are my comments. There are some serious basic design issues with Nick Sayers’ GPSDO hack mentioned by

Re: [time-nuts] Inside a CTS 1960017 OCXO

Not sure if I am missing something here or not but an early mention was made regarding synching the test equipment used to the 60 Hz line to see if the purported 60 Hz anomaly is actually synchronous or asynchronous. I haven't heard anything regarding this since then. Greg

[time-nuts] wrong date on Trimble ACUTIME 2000

Hi, today (29 February] failed several my NTP servers during first few minutes of the day. The reason was wrong date reported by our Trimble ACUTIME 2000 - it forgot the leap year: $GPGGA,004848.0,5006.106,N,01423.494,E,0,08,0.00,00249,M,045,M,,*52

Re: [time-nuts] Inside a CTS 1960017 OCXO

I have two Perseus, one in my Denver lab and one on loan to N0QO. Adam in Canada has his own Perseus, CTS module and some other lab supply. It looks like one of the disassembled CTS modules also has spurs in the 40 to 70-Hz range. Some kind of oscillation. I'll get back to this issue

Re: [time-nuts] Effect of the Antenna Delay in setting in Z380!A

On Mon, February 29, 2016 3:05 pm, Artek Manuals wrote: > One of the commands for the Z38xx series involves setting the Antenna > (feedline) delay.. > Am I correct in assuming that the only thing this does is affect the X, > Y & Z coordinate accuracy of the ground station? Time and frequency >

Re: [time-nuts] Effect of the Antenna Delay in setting in Z380!A

Hi When you change the cabe delay, the X/Y/Z coordinates of the GPS are not impacted in any way. The location of the center of the antenna is what is used before and after you make the adjustment. If you care about frequency only, the setting does not matter. If you are after the best timing

[time-nuts] Effect of the Antenna Delay in setting in Z380!A

One of the commands for the Z38xx series involves setting the Antenna (feedline) delay.. Am I correct in assuming that the only thing this does is affect the X, Y & Z coordinate accuracy of the ground station? Time and frequency accuracy are not really a factor when it comes to the ANT:DELAY

[time-nuts] R D 1992 GPIB is taken

___ 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] WWVB format change in 2012

On 2/29/16 5:31 AM, Tim Shoppa wrote: I have observed always less than 1 millisecond offset and skew with the ntpd wwv audio refclock over more than the past decade. Setting up the audio refclocks involves calculating and configuring propagation delay and delays in the receiver and audio chain.

[time-nuts] HP 10544A Repair

Not to mention that a lot of pots that have been sitting at the same setting for years tend to distort the resistance element where the wiper has been making contact. Then when you make a small adjustment you cannot reach the value that you need. Ahhh, the subtle wonders of aligning old

Re: [time-nuts] Inside a CTS 1960017 OCXO

Rob... Are you and Adam using the same Perseus receiver for your measurements? Have you looked at another similar type (as in small PCB configuration) and powered (as in from your HP supply) oscillator for comparison? Not to beat the PS question to death, but does a battery supply change the

Re: [time-nuts] GPS Outage

Funny how apparently Trimble were involved in the wk860 problem, I thought they famously used their leap second based rollover protection: http://www.google.co.uk/patents/US5923618 :) Maybe that algorithm isn't that smart after all. Thanks, Wojciech    Original Message  

Re: [time-nuts] FW: Instrument BASIC

Joseph, I had seen that the rocky mountain basic was available at some $680 for one license. I guess if you really want it you will pay that. However that will not be me. Regards Paul WB8TSL On Sun, Feb 28, 2016 at 8:50 PM, Joseph Gray wrote: > All this talk of Instrument

Re: [time-nuts] WWVB format change in 2012

On Mon, Feb 29, 2016 at 6:35 AM, Hal Murray wrote: > The audio stuff seems particularly ugly. > > Are there any good non-GPS options these days? In this context, "good" is > a > bit hard to pin down. My straw man is either something in production or > something like a

Re: [time-nuts] FW: Instrument BASIC

Daun... I believe turning the option on required entering a license code. Tom Holmes, N8ZM -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Daun Yeagley Sent: Sunday, February 28, 2016 7:12 PM To: time-nuts@febo.com Subject: [time-nuts] FW: Instrument

Re: [time-nuts] Inside a CTS 1960017 OCXO

Pretty much agree with Dave M. But just like HP, PDI had their basic supplies and their 'low noise/ripple' models, and of course the model with the heater for voltage stability. The one Dave is talking about has a temp controlled voltage reference. The easiest way to tell is there is a 'HEATER'

Re: [time-nuts] WWVB format change in 2012

On 2/29/16 3:39 AM, Hal Murray wrote: tic-...@bodosom.net said: If you can get audio they work. The documented accuracy for WWV is within 1 millisecond of the time pulse. Where is that documented and/or can anybody verify that they get results in that range? What is the (ballpark) of the

[time-nuts] Racal Dana 1992 GPIB

Move, downsizing and clean up I ran across a GPIB adapter for the Racal Dan 1992. It is available to a time nut for the cost of shipping not for resale. Bert Kehren ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] WWVB format change in 2012

On 2/29/16 3:39 AM, Hal Murray wrote: tic-...@bodosom.net said: If you can get audio they work. The documented accuracy for WWV is within 1 millisecond of the time pulse. Where is that documented and/or can anybody verify that they get results in that range? What is the (ballpark) of the

Re: [time-nuts] WWVB format change in 2012

I have observed always less than 1 millisecond offset and skew with the ntpd wwv audio refclock over more than the past decade. Setting up the audio refclocks involves calculating and configuring propagation delay and delays in the receiver and audio chain. As Sanjeev has mentioned, setting up

[time-nuts] Wenzel Timekeeper Oscillator

Hello, Time-Nutters-- I have been sorting through items accumulated in my workshop over the past 10 or 15 years which I will likely never have any more use for. I came across an oscillator made by Wenzel Associates, Austin Texas. Model 500-01301. I bought it to replace the the original

Re: [time-nuts] WWVB format change in 2012

Bob Camp wrote: > Hi > > WWVB and WWV (like any radio uncorrected radio system) has fairly predictable > shifts > associated with the day / night ionosphere. One *could* fix that issue with a > table > based on station location. I do not know of any library of code that does > that already. >

Re: [time-nuts] WWVB format change in 2012

m...@latt.net said: > What are you trying to do? Kill the refclocks entirely, or just pare > them > down to essentials? The idea is to drop the ones that aren't being used and/or we can't test. If we dropped one in error, we can recover it. The audio stuff seems particularly ugly. I

Re: [time-nuts] WWVB format change in 2012

tic-...@bodosom.net said: > If you can get audio they work. The documented accuracy for WWV is within 1 > millisecond of the time pulse. Where is that documented and/or can anybody verify that they get results in that range? What is the (ballpark) of the day/night shift? -- These are my

Re: [time-nuts] HP 10544A Repair

Hi An SC cut OCXO stabilizes a bit faster from the temperature steps. The procedure Rick described is indeed the right way to do it for an SC. It takes less time and is reasonably accurate. For a super duper job you might come back a day later, but the pot its self (backlash etc) will probably

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi For a lot of years the Power Designs supplies were the best kept secret in the business. Everybody thought they had “discovered” them for phase noise testing. They still are a pretty good deal surplus. Bob > On Feb 28, 2016, at 10:25 PM, Dave M wrote: > > Pete

[time-nuts] Specs or datasheet for Hy-Q TCO-405 ocxo

Can anyone help to the specs or datasheet for Hy-Q TCO-405 ocxo It was used in HP 37717 analyzer Met vriendelijke groeten Regards Frans i...@electronicsandbooks.com http://ElectronicsAndBooks.com WEB ElectronicsAndBooks DOT com Netherlands Discere ne cesses

[time-nuts] Recommendations on a reliable Rb Osc

Hi All, I'm interested on a 10 MHz Rb Oscillator. Does anyone have good advice's on a particular model and brand? I prefer a new one with a good price but second hand is also welcome;) Regards, Vasco ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] Next step up from basic GPS/PPS timekeeping

nc...@hotmail.co.uk said: > and building a custom kernel for the Raspberry Pi to include KPPS What distro are you starting with? I'm using Debian. Their kernel includes PPS support, both Wheezy and Jessie. > I had a DS3231 lying around so, ... Are you setup to make long term measurements?

Re: [time-nuts] GPS Outage

Hal, Hal Murray wrote: > > martin.burni...@burnicki.net said: >>> Strange that at least 3 independant firmware trees/development teams should >>> chose the same magic wk860. > >> I don't find it strange. If the next firmware version is based on the >> previous version and none of the developers