Re: [time-nuts] TruePosition on the Arduino

[Chris Albertson]

Yes,   It is easy if you have an Arduino handy.  Write a scratch to
try  EVERY address one at a time.  Print the currently attempted
address top the screen

In fact there is a pre-written sketch in the IDE's I2C examples
folder.  You can run that and it will report what it finds.  It just
tries reads on every possible address.



On Tue, Jun 20, 2017 at 6:02 PM, Tom Miller  wrote:
> Has anyone been able to get the Packrat software to work with a display? I
> have been successful getting the Arduino board to initialize the
> Trueposition board but can't get the display right.
>
> The problem seems to be getting the I2C addressing correct. There are
> several 16x2 line displays available but they address at 0x20 to 0x27 and
> 0x38 to 0x3F. Neither of these work.
>
> Since we do not have the source, is there any way to find out what address
> is in use?
>
> Regards
>
> - Original Message - From: "Gregory Beat" 
> To: 
> Sent: Tuesday, June 06, 2017 8:44 PM
> Subject: Re: [time-nuts] TruePosition on the Arduino
>
>
>> Ben -
>> I assume that you never received the Arduino "C code"
>> written by Bruce, WA3YUE for the original project?
>>
>> Club's Powerpoint presentation indicated that source code was available.
>> http://www.packratvhf.com/techinal.htm
>>
>> Packrat GPS Project (Gary, WA2OMY; Bruce, WA3YUE; George, KA3WXV) with
>> TruePosition GPSDO and Arduino
>> by The Mt. Airy VHF Radio Club "Pack Rats" (Southampton, PA).
>> http://www.qsl.net/wa2omy/A%20Packrat%20GPS%20Receiver%20Project.pdf
>>
>> greg, w9gb
>> ==
>>>
>>> original message / digest <
>>
>> I'm getting to the point that once I've got the button logic working, I'll
>> send out my source to anyone who wants to take a look at it or use it.
>> I will stipulate one condition - you can't make too much fun of how poorly
>> programmed it is.  ;)
>> thanks much and 73,
>> ben, kd5byb
>> ==
>> Sent from iPad Air
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>
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-- 

Chris Albertson
Redondo Beach, California
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Chris Albertson]

it looks to me like Olgierdhas a working INTEL linux
os running on the Pi3.   He installed Wine on the Intel Linux not on
the ARM Linux

It looks like maybe Michael has an ARM version of linux running native
on the Pi3  Wine will not run on that
If you need to run Wine, you need to fist  have an INTEL lInux
running.   Remember "WINE= Wine Is Not an Emulaor" and it will not
run Intel binaries on Arm.

I'm skeptical it would be more then a stunt a triple stack of virtual
environments.  But if the final Windows app is not really doing
anything with the CPU, maybe fast enough.
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Re: [time-nuts] GPS discipline oscillator vs phase lock

[jimlux]

On 6/20/17 4:22 PM, Hal Murray wrote:


jim...@earthlink.net said:

sequential tone ranging: by putting a "ranging tone" at, say, 1 MHz,  on the
carrier


Thanks.  The part that attracted my attention was your "spectrally pure
signal" for the VCO.



Typically a maser at the ground station - that probably gets you fairly 
good close in phase noise characteristics.



Deep space uses very simple modulations (none of this fancy 64QAM)  - 
BPSK direct modulation or BPSK on a 25 or 32 kHz subcarrier.  They 
adjust the mod index of the data and ranging signals to leave 
significant power in the carrier (unless they're in a very good SNR 
situation).


But you can see why people would like PN ranging - it takes NO power 
from the carrier, so you can get a really good doppler estimate.


In reality, of course, you can post process to remove the BPSK data 
(just like removing the PN ranging) and essentially get all the power 
back in the carrier.  But you can really only do that on the downlink. 
On the other hand, the uplink usually has much better SNR than the 
downlink (80kW transmitter into a 34 or 70 m dish gives you a *healthy* 
EIRP), and the data rate on uplink is usually fairly low (nobody uplinks 
at megabits yet)




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Re: [time-nuts] TruePosition on the Arduino

[Tom Miller]

Has anyone been able to get the Packrat software to work with a display? I 
have been successful getting the Arduino board to initialize the 
Trueposition board but can't get the display right.


The problem seems to be getting the I2C addressing correct. There are 
several 16x2 line displays available but they address at 0x20 to 0x27 and 
0x38 to 0x3F. Neither of these work.


Since we do not have the source, is there any way to find out what address 
is in use?


Regards

- Original Message - 
From: "Gregory Beat" 

To: 
Sent: Tuesday, June 06, 2017 8:44 PM
Subject: Re: [time-nuts] TruePosition on the Arduino



Ben -
I assume that you never received the Arduino "C code"
written by Bruce, WA3YUE for the original project?

Club's Powerpoint presentation indicated that source code was available.
http://www.packratvhf.com/techinal.htm

Packrat GPS Project (Gary, WA2OMY; Bruce, WA3YUE; George, KA3WXV) with 
TruePosition GPSDO and Arduino

by The Mt. Airy VHF Radio Club "Pack Rats" (Southampton, PA).
http://www.qsl.net/wa2omy/A%20Packrat%20GPS%20Receiver%20Project.pdf

greg, w9gb
==

original message / digest <
I'm getting to the point that once I've got the button logic working, I'll 
send out my source to anyone who wants to take a look at it or use it.
I will stipulate one condition - you can't make too much fun of how poorly 
programmed it is.  ;)

thanks much and 73,
ben, kd5byb
==
Sent from iPad Air
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Re: [time-nuts] Plate Tectonics was: GPS Antenna on Tower.

[Brooke Clarke]

Hi Attila:

I have a web page devoted to finding true North.
http://www.prc68.com/I/North.shtml

There are many ways.  Here's on that uses the north star.

The first step is to sight the North Star (assuming you are in the Northern 
hemisphere.
But the North star currently is at:
dec: +89°15' 51"
R.A.: 2h 31m 49s

This means that when the sidereal time is 2h 31m 49s it's exactly North and then again after 12:00:00 hours sidereal 
time pass it's again exactly North.   Any star can be used with this method, but the closer the star is to 90 deg dec 
the better from a geometry perspective.


--
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html



One thing I still haven't understood is, how these transit instruments
were "calibrated" and placed exactly on a north-south line.



All fascinating stuff

Definitely!

Attila Kinali




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Re: [time-nuts] GPS Antenna on Tower.

[Hal Murray]

How do the GPS control/monitoring stations handle Earth tides?

My guess is they have another nearby antenna that they can link up to VLBI 
data.

-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] GPS Antenna on Tower.

[Bob kb8tq]

Hi

Earth tides are at least as crazy a topic as time. There are formulas that will 
let you incorporate
the effect of Pluto on solid Earth tides.

Bob

> On Jun 20, 2017, at 7:21 PM, Peter Vince  wrote:
> 
> Hi Mark,
> 
> This is all new information to me - and fascinating!  Have you just
> "calculated" the offsets (using known values from somewhere), or "measured"
> it by very long term averaging of the GPS position information?
> 
> Peter Vince
> 
> 
> On 20 June 2017 at 17:34, Mark Sims  wrote:
> 
>> I just added the ability to calculate solid earth tides and the vertical
>> gravity offset due to the sun and moon to Lady Heather.   The lat/lon
>> offset is typically around +/- 60 cm per day.Vertical offset is around
>> +/- 180mm.  Depending upon the day and where you are, the swings are not
>> symmetrical around 0.0
>> 
>> Solid earth tides are a BIG factor in precision geodesy.   Gravity offset
>> is a big issue for precision pendulum nuts.  If your pendulum clock cannot
>> detect gravity offsets (very few can) it's not nutty enough.
>> 
>> The attached plot shows around 5 days of data.
>> 
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Re: [time-nuts] GPS discipline oscillator vs phase lock

[Hal Murray]

jim...@earthlink.net said:
> sequential tone ranging: by putting a "ranging tone" at, say, 1 MHz,  on the
> carrier

Thanks.  The part that attracted my attention was your "spectrally pure 
signal" for the VCO.

I think the answer I was fishing for is that the modulation has to be easy to 
filter out.


Many years ago, I did some work on radar.  The only part I remember was the 
range-velocity ambiguity.  It's the radar version of Heisenberg for signal 
processing.  You can't measure both frequency and time of a signal with high 
accuracy.  Radar uses distance and velocity rather than time and frequency.

The plot I remember was 3D, range and velocity error in X-Y and probability 
or signal-power or something like that in Z.  For a simple radar pulse of a 
given duration, the plot is a bell curve.  Make the pulse longer and the 
curve gets narrower in velocity but wider in distance.  Make the pulse 
shorter and you get better distance but poorer velocity.  The volume was 
constant.

In radar, you can do things like chirp and pulse trains, but they just push 
the ambiguity over to someplace else.

> Tone ranging also requires that you have a  good a-priori estimate to pick a
> suitable set of tones.

That lets you pick a signal that puts some of the ambiguity someplace where 
you can ignore it.

-

I still have the little red book from those days.  I wonder how long it would 
take me to get back to where I could understand most of it.

P M Woodward: Probability and Information Theory with Applications to Radar.  
1953

Small world.  There is a more direct time-nuts connection.
  https://en.wikipedia.org/wiki/Philip_Woodward#W5_clock
  https://en.wikipedia.org/wiki/Philip_Woodward#Achievements_in_horology





-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] HP 4815 Vector Impedance Analyzer repair

[Jerry Hancock]

Rick,

I have two, one I repaired yesterday using parts from the second.  Since 
acquiring both of them about 4yrs ago, I’ve had to repair the “working” unit 
five times including the first time when I picked it up.  Unlike other HP 
equipment I own, this thing hasn’t been as reliable.  Luckily having the parts 
mule (other than a voltage problem once) I was able to fix it by looking in the 
repair manual and swapping the impacted card.

As what Tom suggested, I would check the voltages first as the balance of both 
amplitude and phase is impacted by the +/- voltages being out of balance.  I 
think it was +/- 24V but I could be wrong as I haven’t had a voltage related 
problem in a couple of years.

So far, mine has had 4 defective cards, two bad power supply caps and two bad 
regulators. Luckily (again) it’s never been that same card.  The cards that 
have failed have had transistor/FET issues opposed to passive components.  When 
I get around to repairing the defective cards I am going to swap out the FETs 
(on the defective cards) first and suggest you do the same once verifying the 
voltages are correct and no caps have failed.  I’ve had leaky FET issues on 
3455A volt meters.  I have a card here on my desk for the past year and I’ve 
gone over the passives two or three times and can’t find a problem so I can 
only assume at this point that there is a leaky FET on that one.

My 4815A is one of my favorite pieces of equipment. It is very versatile.  
After fixing it yesterday, I tried measuring the impedance of several caps and 
the unit was accurate to the limit of the meters.

I might be able to help you if you get stuck but I’ll admit, my problem 
diagnosis has been limited to swapping cards after getting close in the manual.

Jerry

> On Jun 20, 2017, at 1:38 PM, Tom Curlee  wrote:
> 
> The first thing I would do is replace all the power supply electrolytic 
> capacitors on the internal boards.  If I remember correctly, the boards are 
> plugged in and the replacing the capacitors is quite easy.  In my unit, at 
> least one capacitor was shorted and was pulling down a power supply.  
> 
> Tom  WB6UZZ
> 
> 
>  From: Richard (Rick) Karlquist 
> To: Discussion of precise time and frequency measurement  
> Sent: Tuesday, June 20, 2017 12:02 PM
> Subject: [time-nuts] HP 4815 Vector Impedance Analyzer repair
> 
> I have a non-functional HP 4815, don't know if it
> is the probe or the box.  A long time ago, there
> was a fellow named George Standford (something like
> that) who repaired these.  My old contact information
> for him is no good.  Does anyone know if he is still
> in business, or if there is any other place that
> repairs these things?
> 
> Rick N6RK
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> 
> 
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Re: [time-nuts] GPS Antenna on Tower.

[Peter Vince]

Hi Mark,

 This is all new information to me - and fascinating!  Have you just
"calculated" the offsets (using known values from somewhere), or "measured"
it by very long term averaging of the GPS position information?

 Peter Vince


On 20 June 2017 at 17:34, Mark Sims  wrote:

> I just added the ability to calculate solid earth tides and the vertical
> gravity offset due to the sun and moon to Lady Heather.   The lat/lon
> offset is typically around +/- 60 cm per day.Vertical offset is around
> +/- 180mm.  Depending upon the day and where you are, the swings are not
> symmetrical around 0.0
>
> Solid earth tides are a BIG factor in precision geodesy.   Gravity offset
> is a big issue for precision pendulum nuts.  If your pendulum clock cannot
> detect gravity offsets (very few can) it's not nutty enough.
>
> The attached plot shows around 5 days of data.
>
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Re: [time-nuts] CRT for Tracor 527A

[paul swed]

A suggestion.
$300 does seem a lot for a gamble.
But if it really gets bad you can buy any scope and plumb it in and get
what you need.
Clearly an OK answer. But a thought none the less.
Regards
Paul
WB8TSL

On Tue, Jun 20, 2017 at 6:06 PM, Clint Jay  wrote:

> A little extra heater voltage and allowing the tube to 'cook' a while can
> help as can a CRT rejuvenator but the cathode is usually tiny on a mono
> tube and  from experience with television repairs back in the dawn of my
> career, they very rarely last any length of time after rejuvenation before
> emission dies off again.
>
> YMMV, a NOS tube may respond better and if you've gone from nothing to
> something it may be worth taking the gamble, especially if the tube you're
> replacing is badly burned in.
>
> On 20 Jun 2017 11:00 pm, "Brooke Clarke"  wrote:
>
> > Hi:
> >
> > Yes, there are Cathode "Rejuvenators" that can sometimes give a CRT some
> > more lift.  This is a problem with all test equipment that uses CRTs.
> > There are LCD replacements for the CRT in some HP equipment, like the
> 8566
> > SA.
> >
> > --
> > Have Fun,
> >
> > Brooke Clarke
> > http://www.PRC68.com
> > http://www.end2partygovernment.com/2012Issues.html
> >
> >  Original Message 
> >
> >> Hello to the group.
> >> I was not going to comment on the thread. But realized I should.
> >> A caution on CRTs is that if they have been around a long time they may
> >> have very poor emissions. Even if new. Cathode pollutes over time.
> >> Just saying don't be to surprised if you don't get what you paid for.
> >> Best of luck to you.
> >> Regards
> >> Paul
> >> WB8TSL
> >>
> >> On Tue, Jun 20, 2017 at 5:12 PM, Pete Lancashire <
> p...@petelancashire.com
> >> >
> >> wrote:
> >>
> >> Not rare but uncommon. I gave the one I have away a couple years ago.
> Ask
> >>> on a few of he military/boatanchor lists, I've had pretty good luck.
> >>>
> >>> -pete
> >>>
> >>> On Tue, Jun 20, 2017 at 2:01 PM, David C. Partridge <
> >>> david.partri...@perdrix.co.uk> wrote:
> >>>
> >>> Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11,
> 
> >>> or?)
> >>>
>  for a Tracor 527A Frequency Difference Meter.
> 
>  I did spot some on eBay but the vendor had a rather high opinion of
>  their
>  worth :) at over 300 dollars
> 
>  Anyone got one to spare?
> 
>  Thanks
>  Dave
> 
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Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

[Charles Steinmetz]

Attila wrote:


Now, if the downstream circuit would be low
impedance, I could understand that, but the sink is a comparator with a
high impedance input (only a few µA input current). I am sure the engineers
had a good reason to add those amplifiers, but I cannot guess why. Would
someone be so kind and enlighten me?


I was going tp post the Smith chart for the input of the AD96885/7 ECL 
comparator they use, but was surprised to find that AD did not include 
it on the datasheet.  However, just from the spec table we can see why a 
buffer is necessary:


Input Resistance:   200k ohms
Input Capacitance: 2pF

For starters, even at low frequencies the input impedance is only 200k 
ohms, much less than the 1Mohm rated impedance.  Further, the 
capacitance seriously degrades bandwidth to as low as 400kHz (this 
depends on the source impedance, but even with a 10kohm source the BW is 
only 8MHz).


(Note that the input current spec is not necessarily a good proxy for 
input impedance -- consider a FET-input amplifier with an input current 
of 1uA and a 100k gate resistor.)


Best regards,

Charles


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[time-nuts] GPS Antenna on Tower.

[Mark Sims]

I just added the ability to calculate solid earth tides and the vertical 
gravity offset due to the sun and moon to Lady Heather.   The lat/lon offset is 
typically around +/- 60 cm per day.Vertical offset is around  +/- 180mm.  
Depending upon the day and where you are, the swings are not symmetrical around 
0.0   

Solid earth tides are a BIG factor in precision geodesy.   Gravity offset is a 
big issue for precision pendulum nuts.  If your pendulum clock cannot detect 
gravity offsets (very few can) it's not nutty enough.

The attached plot shows around 5 days of data.

---

>  Since 1cm of motion is equivalent to 30ps, there's probably not
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Olgierd Dudko]

Hi Michel,
I installed Wine (Windows compatibility layer) within the ExaGear.
After the installation of the ExaGear on a Raspberry Pi one gets a new icon on 
the desktop that just starts a session of Debian-8. Trying command "$ arch" 
returns "i686" beauty!
What I did (within this Debian session) was:
$ sudo apt-get update
$ sudo apt-get upgrade (- this returned couple of warnings/errors mainly in the 
area of certificates updating - nothing critical I suppose)
And just $ sudo apt-get install wine ...did the trick.

Try then:
$ wine --version 
$ wine start
For the first time, Wine dowloaded itself some extra .Net emulation as well as 
Internet Explorer (Gecko) module. 

One needs also to create a sybolic link in ~/.wine/dosdevices to enable the 
serial port for Windows (assuming e.g. the FTDI driver recognised it on the 
Raspbian level):
$ ln -s /dev/ttyUSB0 ~/.wine/dosdevices/com1

Note ExaGear offers three day trial for free. Let me add a quote from an 
Eltechs email:
"The best way to get the trial is to install it directly from Raspberry Pi 
repository. For that, you have to open the command line and input two simple 
commands: 

sudo apt-get update 

sudo apt-get install exagear-desktop 

After the installation you need to run 'exagear' command and fill in the pop-up 
form to get trial license key."

I believe that having a native GPS monitoring software on a Raspberry Pi 
instead of PC would become a game changer. My GPScon has been working 
flawlessly for few days now.
Good luck!

Olgierd

Dnia 20.06.2017 o godz. 14:34 time...@metachaos.net napisał(a):

> Neat!
> 
> I just happen to be playing with a Pi this week as a class assignment
> (retirement is wonderful - finally going back to college).
> 
> I downloaded Lady Heather, compiled it, and got it to come up and run. Nothing
> that I can plug in this week though, but it looks good. I also installed QEMU
> in user mode which is similar to ExaGear, but slower and free (long run I will
> probably get an ASUS Tinker as my lab computer, and it is a different 
> ExaGear).
> 
> However, I could not find the steps to download wine. I understand that some
> sort of patch is required, but all that I could find was complete linux images
> that were already patched. What were your steps to download and install wine?
> 
> Michael
> 
>> Hi,
>> This is my first post to the community I learned so much from. Just wanted
>> to share -- I managed to succesfully install today the GPScon windows
>> application on a micro computer Raspberry Pi 3 model B. CPU utilisation is 
>> 2% - a perfect overall result.
>> I used an FTDI RS232 USB dongle to connect Z3805A/58503B to the Pi. First I
>> installed on the Pi a Russian commercial I686 emulation software called
>> ExaGear Desktop by Eltechs.com ($30). It provides a Debian-8 Intel
>> environment on the Arm CPU. Next move was to (sudo apt-get) install wine
>> Windows XP emulator and symlink therein com1 as /dev/ttyUSB0 - to enable the
>> usb dongle to be seen by Wine as com1.
>> Then I installed my copy of GPScon from 2013, which turned out to work 
>> pretty well.
>> Hope this post was usefull. In case of interest I would exact steps to make 
>> this working.
> 
>> Best regards
>> Olgierd
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> 
> 
> 
> -- 
> Best regards,
> Timenutmailto:time...@metachaos.net
> 
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Re: [time-nuts] ebay posting

[Dave M]

Bert Kehren via time-nuts wrote:

Since I have a Tracor 527E I am not going to bid on the following
link. I have bought two items with very good results and have nothing
to do with the seller. I suspect based on his location that this is
NASA material. The
unit has  a FRK Rb in it.
Bert Kehren
_http://www.ebay.com/itm/Argosystems-AS210-RM-Rubidium-Time-Frequency-Calibr
ation-System/332265338742?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m14
38.l2649_
(http://www.ebay.com/itm/Argosystems-AS210-RM-Rubidium-Time-Frequency-Calibration-System/332265338742?ssPageName=STRK:MEBIDX:IT&_trksid=p20603
53.m1438.l2649)



A friend has a number of the AS210-04 Digital Delay Generators.  We've been 
unable to find any info on the unit.  Does anyone have a link for a 
downloadable copy of the manual, or at least the schematic, for these items?


Would love to get a PDF of the complete AS210 system manuals


Thanks!!
Dave M 


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Re: [time-nuts] HP 4815 Vector Impedance Analyzer repair

[Tom Curlee]

The first thing I would do is replace all the power supply electrolytic 
capacitors on the internal boards.  If I remember correctly, the boards are 
plugged in and the replacing the capacitors is quite easy.  In my unit, at 
least one capacitor was shorted and was pulling down a power supply.  

Tom  WB6UZZ


  From: Richard (Rick) Karlquist 
 To: Discussion of precise time and frequency measurement  
 Sent: Tuesday, June 20, 2017 12:02 PM
 Subject: [time-nuts] HP 4815 Vector Impedance Analyzer repair
  
I have a non-functional HP 4815, don't know if it
is the probe or the box.  A long time ago, there
was a fellow named George Standford (something like
that) who repaired these.  My old contact information
for him is no good.  Does anyone know if he is still
in business, or if there is any other place that
repairs these things?

Rick N6RK
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Re: [time-nuts] CRT for Tracor 527A

[Clint Jay]

A little extra heater voltage and allowing the tube to 'cook' a while can
help as can a CRT rejuvenator but the cathode is usually tiny on a mono
tube and  from experience with television repairs back in the dawn of my
career, they very rarely last any length of time after rejuvenation before
emission dies off again.

YMMV, a NOS tube may respond better and if you've gone from nothing to
something it may be worth taking the gamble, especially if the tube you're
replacing is badly burned in.

On 20 Jun 2017 11:00 pm, "Brooke Clarke"  wrote:

> Hi:
>
> Yes, there are Cathode "Rejuvenators" that can sometimes give a CRT some
> more lift.  This is a problem with all test equipment that uses CRTs.
> There are LCD replacements for the CRT in some HP equipment, like the 8566
> SA.
>
> --
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
>
>  Original Message 
>
>> Hello to the group.
>> I was not going to comment on the thread. But realized I should.
>> A caution on CRTs is that if they have been around a long time they may
>> have very poor emissions. Even if new. Cathode pollutes over time.
>> Just saying don't be to surprised if you don't get what you paid for.
>> Best of luck to you.
>> Regards
>> Paul
>> WB8TSL
>>
>> On Tue, Jun 20, 2017 at 5:12 PM, Pete Lancashire > >
>> wrote:
>>
>> Not rare but uncommon. I gave the one I have away a couple years ago. Ask
>>> on a few of he military/boatanchor lists, I've had pretty good luck.
>>>
>>> -pete
>>>
>>> On Tue, Jun 20, 2017 at 2:01 PM, David C. Partridge <
>>> david.partri...@perdrix.co.uk> wrote:
>>>
>>> Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11,

>>> or?)
>>>
 for a Tracor 527A Frequency Difference Meter.

 I did spot some on eBay but the vendor had a rather high opinion of
 their
 worth :) at over 300 dollars

 Anyone got one to spare?

 Thanks
 Dave

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 mailman/listinfo/time-nuts
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 ___
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Re: [time-nuts] CRT for Tracor 527A

[Brooke Clarke]

Hi:

Yes, there are Cathode "Rejuvenators" that can sometimes give a CRT some more lift.  This is a problem with all test 
equipment that uses CRTs.  There are LCD replacements for the CRT in some HP equipment, like the 8566 SA.


--
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

 Original Message 

Hello to the group.
I was not going to comment on the thread. But realized I should.
A caution on CRTs is that if they have been around a long time they may
have very poor emissions. Even if new. Cathode pollutes over time.
Just saying don't be to surprised if you don't get what you paid for.
Best of luck to you.
Regards
Paul
WB8TSL

On Tue, Jun 20, 2017 at 5:12 PM, Pete Lancashire 
wrote:


Not rare but uncommon. I gave the one I have away a couple years ago. Ask
on a few of he military/boatanchor lists, I've had pretty good luck.

-pete

On Tue, Jun 20, 2017 at 2:01 PM, David C. Partridge <
david.partri...@perdrix.co.uk> wrote:


Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11,

or?)

for a Tracor 527A Frequency Difference Meter.

I did spot some on eBay but the vendor had a rather high opinion of their
worth :) at over 300 dollars

Anyone got one to spare?

Thanks
Dave

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Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

[Bruce Griffiths]

If the source impendance at dc is 10k at dc a bias current of a few microamp 
produces a dc offset of tens of millivolts which may be an issue if the signal 
amplitude is low and has a low slew rate. 

Bruce

> 
> On 21 June 2017 at 09:11 Charles Steinmetz  wrote:
> 
> Attila wrote:
> 
> > > 
> > Now, if the downstream circuit would be low
> > impedance, I could understand that, but the sink is a comparator 
> > with a
> > high impedance input (only a few µA input current). I am sure the 
> > engineers
> > had a good reason to add those amplifiers, but I cannot guess why. 
> > Would
> > someone be so kind and enlighten me?
> > 
> > > 
> I was going tp post the Smith chart for the input of the AD96885/7 ECL
> comparator they use, but was surprised to find that AD did not include
> it on the datasheet. However, just from the spec table we can see why a
> buffer is necessary:
> 
> Input Resistance: 200k ohms
> Input Capacitance: 2pF
> 
> For starters, even at low frequencies the input impedance is only 200k
> ohms, much less than the 1Mohm rated impedance. Further, the
> capacitance seriously degrades bandwidth to as low as 400kHz (this
> depends on the source impedance, but even with a 10kohm source the BW is
> only 8MHz).
> 
> (Note that the input current spec is not necessarily a good proxy for
> input impedance -- consider a FET-input amplifier with an input current
> of 1uA and a 100k gate resistor.)
> 
> Best regards,
> 
> Charles
> 
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Re: [time-nuts] CRT for Tracor 527A

[paul swed]

Hello to the group.
I was not going to comment on the thread. But realized I should.
A caution on CRTs is that if they have been around a long time they may
have very poor emissions. Even if new. Cathode pollutes over time.
Just saying don't be to surprised if you don't get what you paid for.
Best of luck to you.
Regards
Paul
WB8TSL

On Tue, Jun 20, 2017 at 5:12 PM, Pete Lancashire 
wrote:

> Not rare but uncommon. I gave the one I have away a couple years ago. Ask
> on a few of he military/boatanchor lists, I've had pretty good luck.
>
> -pete
>
> On Tue, Jun 20, 2017 at 2:01 PM, David C. Partridge <
> david.partri...@perdrix.co.uk> wrote:
>
> > Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11,
> or?)
> > for a Tracor 527A Frequency Difference Meter.
> >
> > I did spot some on eBay but the vendor had a rather high opinion of their
> > worth :) at over 300 dollars
> >
> > Anyone got one to spare?
> >
> > Thanks
> > Dave
> >
> > ___
> > 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.
> >
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Re: [time-nuts] Plate Tectonics was: GPS Antenna on Tower.

[Attila Kinali]

On Tue, 20 Jun 2017 13:29:24 -0700
Brooke Clarke  wrote:

>  Original Message 
> > I have wondered how geologists are able to measure tectonic plate 
> > movements in the earths surface to a couple cm's when the sensors from 
> > what I see/read they are nothing more than sensors in concrete boxes?. I 
> > believe they use various technologies such as Very Long Baseline 
> > Interferometry
> >  (VLBI)
> >  and Satellite Laser 
> > Ranging
> >  (SLR)

The first "proofs" for plate tectonics were not related to ranging
and movement at all. They were based on evidence burried in the ground:
http://hyperphysics.phy-astr.gsu.edu/hbase/Geophys/platevid.html

I don't know when the first proof using longitude measurments was made,
but it must have been fairly recent (i'd say last 100 years at most)
as pretty stable clocks were needed. Probably at least quartz
or maybe even atomic clocks.

Modern tectonic movement measurements are mostly based on GPS.
Even using a simple L1 C/A only receiver, one can achieve sub-cm
accuracy if phase data is recorded over several hours and post-processed.
Using an L1/L2 receiver, compensating for all those "tiny" effects
and averaging over a few days should result in sub-mm differences over
quite long baselines.

Side note:
Solid earth tides are in the order of 20-50cm vertical and 10-30cm horizontal.
(if i remember correctly)

> The first data on tectonic plate movement came from the Latitude 
> Observatories.  The Longitude problem was solved fairly 
> quickly by Harrison's clocks but the uncertainty of an observatories 
> latitude because of wobble of the pole took much 
> longer and was addressed by a hand full of Latitude Observatories all at 39 
> deg 8 min North, and I'm lucky to have one 
> in my town.
> http://www.prc68.com/I/UkiahObs.shtml
> Note this is more like an extremely accurate surveying instrument than a 
> telescope for star watching.  We will be having 
> star parties since it's summer and the sky here is dark enough to see the 
> Milky way.

These telescopes are called zenith telescopes and could only be moved
in one plane. This telescope is transit instrument and the modern version
of the mural circle. Transit instruments are used to measure when a star
passes through the north-south line/plane. This can then be used to
define local time. The modern variants of the zenith telescopes are used
by the IERS to measure siderial time and compare it to TAI/UTC.
The transit instruments in Greenwich defined the 0 meridian. Hence
every time the instrument got upgraded by a better one, the meridian
moved a bit. 

One thing I still haven't understood is, how these transit instruments
were "calibrated" and placed exactly on a north-south line.


> > All fascinating stuff

Definitely!

Attila Kinali


-- 
You know, the very powerful and the very stupid have one thing in common.
They don't alters their views to fit the facts, they alter the facts to
fit the views, which can be uncomfortable if you happen to be one of the
facts that needs altering.  -- The Doctor
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Re: [time-nuts] CRT for Tracor 527A

[Pete Lancashire]

Not rare but uncommon. I gave the one I have away a couple years ago. Ask
on a few of he military/boatanchor lists, I've had pretty good luck.

-pete

On Tue, Jun 20, 2017 at 2:01 PM, David C. Partridge <
david.partri...@perdrix.co.uk> wrote:

> Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11, or?)
> for a Tracor 527A Frequency Difference Meter.
>
> I did spot some on eBay but the vendor had a rather high opinion of their
> worth :) at over 300 dollars
>
> Anyone got one to spare?
>
> Thanks
> Dave
>
> ___
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> mailman/listinfo/time-nuts
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>
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Re: [time-nuts] HP 4815 Vector Impedance Analyzer repair

[Clay Autery]

There's a guy on eBay who sells HP stuff (and other) who does certified
calibrations and repairs of HP stuff...  can't be that hard to find...

KN5U is his eBay ID (and call sign?)  He calibrated my HP freq counter
before sending it to me after I won it on one of his auctions...

__
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389

On 6/20/2017 1:51 PM, Richard (Rick) Karlquist wrote:
> I have a non-functional HP 4815, don't know if it
> is the probe or the box.  A long time ago, there
> was a fellow named George Standford (something like
> that) who repaired these.  My old contact information
> for him is no good.  Does anyone know if he is still
> in business, or if there is any other place that
> repairs these things?
>
> Rick N6RK
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[time-nuts] CRT for Tracor 527A

[David C. Partridge]

Trying a long shot here, I'm looking for a 1" CRT type 1EP1 (or 1EP11, or?)
for a Tracor 527A Frequency Difference Meter.
 
I did spot some on eBay but the vendor had a rather high opinion of their
worth :) at over 300 dollars

Anyone got one to spare?

Thanks
Dave

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[time-nuts] Plate Tectonics was: GPS Antenna on Tower.

[Brooke Clarke]

Hi Bryan:

The first data on tectonic plate movement came from the Latitude Observatories.  The Longitude problem was solved fairly 
quickly by Harrison's clocks but the uncertainty of an observatories latitude because of wobble of the pole took much 
longer and was addressed by a hand full of Latitude Observatories all at 39 deg 8 min North, and I'm lucky to have one 
in my town.

http://www.prc68.com/I/UkiahObs.shtml
Note this is more like an extremely accurate surveying instrument than a telescope for star watching.  We will be having 
star parties since it's summer and the sky here is dark enough to see the Milky way.


--
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html

 Original Message 

I have wondered how geologists are able to measure tectonic plate movements in the earths 
surface to a couple cm's when the sensors from what I see/read they are nothing more than 
sensors in concrete boxes?. I believe they use various technologies such as Very Long 
Baseline 
Interferometry
 (VLBI) and Satellite Laser 
Ranging
 (SLR)


All fascinating stuff




-=Bryan=-



From: time-nuts  on behalf of Thorbjørn Pedersen 

Sent: June 19, 2017 9:42 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS Antenna on Tower.

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
[http://www.sp.se/sv/index/resources/GNSS/PublishingImages/pelare.jpg]

GNSS-equipment - SP
www.sp.se
GNSS-equipment RISE has equipment for GNSS (Global Navigation Satellite 
Systems) for applications in Time and Frequency, Positioning and Atmospheric 
Studies.



Have a look at the best receiving antenna I know about.

The tower must have cooling tubes coiled around it because of the sun heating 
one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.

Best Regards

Thorbjørn W. Pedersen


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postings to ...



and follow the instructions there.
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Re: [time-nuts] HP 4815 Vector Impedance Analyzer repair

[paul swed]

Rick
Sorry to say I do not know but I do remember an article in EDN I think.
The ground connections were riveted and essentially made poor contact after
many years.
Drilling them out and putting normal screws nuts and lovking lugs in
evidently really restored the units.
Regards
Paul
WB8TSL

On Tue, Jun 20, 2017 at 2:51 PM, Richard (Rick) Karlquist <
rich...@karlquist.com> wrote:

> I have a non-functional HP 4815, don't know if it
> is the probe or the box.  A long time ago, there
> was a fellow named George Standford (something like
> that) who repaired these.  My old contact information
> for him is no good.  Does anyone know if he is still
> in business, or if there is any other place that
> repairs these things?
>
> Rick N6RK
> ___
> time-nuts mailing list -- time-nuts@febo.com
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> ailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] GPS Antenna on Tower.

[Bryan _]

I have wondered how geologists are able to measure tectonic plate movements in 
the earths surface to a couple cm's when the sensors from what I see/read they 
are nothing more than sensors in concrete boxes?. I believe they use various 
technologies such as Very Long Baseline 
Interferometry
 (VLBI) and Satellite Laser 
Ranging
 (SLR)


All fascinating stuff




-=Bryan=-



From: time-nuts  on behalf of Thorbjørn Pedersen 

Sent: June 19, 2017 9:42 PM
To: time-nuts@febo.com
Subject: Re: [time-nuts] GPS Antenna on Tower.

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
[http://www.sp.se/sv/index/resources/GNSS/PublishingImages/pelare.jpg]

GNSS-equipment - SP
www.sp.se
GNSS-equipment RISE has equipment for GNSS (Global Navigation Satellite 
Systems) for applications in Time and Frequency, Positioning and Atmospheric 
Studies.



Have a look at the best receiving antenna I know about.

The tower must have cooling tubes coiled around it because of the sun heating 
one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.

Best Regards

Thorbjørn W. Pedersen


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Enterprises
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time-nuts is a low volume, high SNR list for the discussion of precise time and 
frequency measurement and related topics. To see the collection of prior 
postings to ...



and follow the instructions there.
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[time-nuts] HP 4815 Vector Impedance Analyzer repair

[Richard (Rick) Karlquist]

I have a non-functional HP 4815, don't know if it
is the probe or the box.  A long time ago, there
was a fellow named George Standford (something like
that) who repaired these.  My old contact information
for him is no good.  Does anyone know if he is still
in business, or if there is any other place that
repairs these things?

Rick N6RK
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Re: [time-nuts] TBolt help...

[Bert Kehren via time-nuts]

You are not the only one that has experienced that problem happened to my  
friend Juerg today too and a while back to me
Bert Kehren
 
 
In a message dated 6/20/2017 1:15:34 P.M. Eastern Daylight Time,  
dave.mall...@gmail.com writes:

hi

many  thanks to all!

it was much simpler:  the pins in the power plug on  the Tbolt had gradually
slid up in the connector block till the -12  disconnected.
all this in a closed insulated box on the  wall!!!

humbled and happy

73,

dave mallery,  k5en

On Mon, Jun 19, 2017 at 7:12 PM, J. L. Trantham   wrote:

> I had a T-Bolt 'failure' when my  -12V supply died.
>
> I am aware of another event on the list when  the solder connection at the
> -12V connector to the t-Bolt  failed.
>
> Make sure the -12V is reaching the PCB for the  T-Bolt.
>
> Hope this helps.
>
> Joe
>
>  -Original Message-
> From: time-nuts  [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van
> Baak
>  Sent: Monday, June 19, 2017 3:42 PM
> To: Discussion of precise time and  frequency measurement
> Subject: Re: [time-nuts] TBolt  help...
>
> Hi Dave,
>
> There was one other report of  something similar over the past ten years. 
I
> did not look into  it.
>
> Since your TBolt was part of the group buy, I'll send you  a new one.
> Contact me off-list. But can you double check the -12 V  power supply
> voltage for me? Anything between -7 and -15 is probably  ok. But if it 
fails
> it will affect the serial port. Also, if you have  time, open the box and
> use a 'scope on both the input (TTL) and output  (RS232) of the serial
> transceiver.
>
> Thanks,
>  /tvb
>
> - Original Message -
> From: "Dave Mallery"  
> To: "Discussion of precise time and  frequency measurement" <
> time-nuts@febo.com>
> Sent:  Monday, June 19, 2017 1:16 PM
> Subject: [time-nuts] TBolt  help...
>
>
> > hi
> >
> > My Tbolt has  been running for a long time, since the final group buy.
> >
>  > It is still running (indicated by the 10MHz output) but there is no  
data
> > coming out the serial port. LH says so and so does my lil  TSIP monitor,
> as
> > well as my rs-232 cable monitor/breakout  devices.  I have tested all 
the
> > cables involved.
>  >
> > If this has happened to you, were you able to isolate it  further?  is 
it
> > fixable?
> >
> > many  thanks in advance!
> >
> > dave mallery
> >
>  > --
> > Dave Mallery, K5EN   (ubuntu linux 16-10)
> > PO Box 15Ophir,  OR  97464
> >
>  >  linux counter #64628 (since  1997)
>
>
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-- 
Dave Mallery,  K5EN (ubuntu  linux 16-10)
PO Box 15   Ophir,  OR   97464

linux counter #64628 (since  1997)
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Re: [time-nuts] TBolt help...

[Dave Mallery]

hi

many thanks to all!

it was much simpler:  the pins in the power plug on the Tbolt had gradually
slid up in the connector block till the -12 disconnected.
all this in a closed insulated box on the wall!!!

humbled and happy

73,

dave mallery, k5en

On Mon, Jun 19, 2017 at 7:12 PM, J. L. Trantham  wrote:

> I had a T-Bolt 'failure' when my -12V supply died.
>
> I am aware of another event on the list when the solder connection at the
> -12V connector to the t-Bolt failed.
>
> Make sure the -12V is reaching the PCB for the T-Bolt.
>
> Hope this helps.
>
> Joe
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Tom Van
> Baak
> Sent: Monday, June 19, 2017 3:42 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] TBolt help...
>
> Hi Dave,
>
> There was one other report of something similar over the past ten years. I
> did not look into it.
>
> Since your TBolt was part of the group buy, I'll send you a new one.
> Contact me off-list. But can you double check the -12 V power supply
> voltage for me? Anything between -7 and -15 is probably ok. But if it fails
> it will affect the serial port. Also, if you have time, open the box and
> use a 'scope on both the input (TTL) and output (RS232) of the serial
> transceiver.
>
> Thanks,
> /tvb
>
> - Original Message -
> From: "Dave Mallery" 
> To: "Discussion of precise time and frequency measurement" <
> time-nuts@febo.com>
> Sent: Monday, June 19, 2017 1:16 PM
> Subject: [time-nuts] TBolt help...
>
>
> > hi
> >
> > My Tbolt has been running for a long time, since the final group buy.
> >
> > It is still running (indicated by the 10MHz output) but there is no data
> > coming out the serial port. LH says so and so does my lil TSIP monitor,
> as
> > well as my rs-232 cable monitor/breakout devices.  I have tested all the
> > cables involved.
> >
> > If this has happened to you, were you able to isolate it further?  is it
> > fixable?
> >
> > many thanks in advance!
> >
> > dave mallery
> >
> > --
> > Dave Mallery, K5EN (ubuntu linux 16-10)
> > PO Box 15  Ophir,  OR  97464
> >
> >  linux counter #64628 (since 1997)
>
>
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-- 
Dave Mallery, K5EN (ubuntu linux 16-10)
PO Box 15  Ophir,  OR  97464

  linux counter #64628 (since 1997)
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Re: [time-nuts] GPS Antenna on Tower.

[Clay Autery]

I thought there was kind of a rule about EXCLUDING sats on or near the
horizon...

__
Clay Autery, KY5G

On 6/20/2017 8:27 AM, "Björn Gabrielsson" wrote:
> Hi Thorbjörn,
>
> To bad this particula antenna has surrounding buildings (and maybe trees)
> that mask low elevation satellites.
>
> --
>
>Björn
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[time-nuts] ebay posting

[Bert Kehren via time-nuts]

Since I have a Tracor 527E I am not going to bid on the following link. I  
have bought two items with very good results and have nothing to do with the 
 seller. I suspect based on his location that this is NASA material. The 
unit has  a FRK Rb in it. 
Bert Kehren
_http://www.ebay.com/itm/Argosystems-AS210-RM-Rubidium-Time-Frequency-Calibr
ation-System/332265338742?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m14
38.l2649_ 
(http://www.ebay.com/itm/Argosystems-AS210-RM-Rubidium-Time-Frequency-Calibration-System/332265338742?ssPageName=STRK:MEBIDX:IT&_trksid=p20603
53.m1438.l2649) 
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Re: [time-nuts] GPS Antenna on Tower.

[Björn Gabrielsson]

Hi Thorbjörn,

To bad this particula antenna has surrounding buildings (and maybe trees)
that mask low elevation satellites.

--

   Björn

> http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
> Have a look at the best receiving antenna I know about.
>
> The tower must have cooling tubes coiled around it because of the sun
> heating one side will make it bend away from the sun, and turn this way
> all day.
> The cable and doom is also temperature controlled.
>
> Best Regards
>
> Thorbjørn W. Pedersen
>
>
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Neat!

I just happen to be playing with a Pi this week as a class assignment
(retirement is wonderful - finally going back to college).

I downloaded Lady Heather, compiled it, and got it to come up and run. Nothing
that I can plug in this week though, but it looks good. I also installed QEMU
in user mode which is similar to ExaGear, but slower and free (long run I will
probably get an ASUS Tinker as my lab computer, and it is a different ExaGear).

However, I could not find the steps to download wine. I understand that some
sort of patch is required, but all that I could find was complete linux images
that were already patched. What were your steps to download and install wine?

Michael

> Hi,
> This is my first post to the community I learned so much from. Just wanted
> to share -- I managed to succesfully install today the GPScon windows
> application on a micro computer Raspberry Pi 3 model B. CPU utilisation is 2% 
> - a perfect overall result.
> I used an FTDI RS232 USB dongle to connect Z3805A/58503B to the Pi. First I
> installed on the Pi a Russian commercial I686 emulation software called
> ExaGear Desktop by Eltechs.com ($30). It provides a Debian-8 Intel
> environment on the Arm CPU. Next move was to (sudo apt-get) install wine
> Windows XP emulator and symlink therein com1 as /dev/ttyUSB0 - to enable the
> usb dongle to be seen by Wine as com1.
> Then I installed my copy of GPScon from 2013, which turned out to work pretty 
> well.
> Hope this post was usefull. In case of interest I would exact steps to make 
> this working.

> Best regards
> Olgierd
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-- 
Best regards,
 Timenutmailto:time...@metachaos.net

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Re: [time-nuts] GPS Antenna on Tower.

[Michael Wouters]

Try again ...,

Since 1cm of motion is equivalent to 30 ps, there's probably not much point
in putting your GNSS antenna on a geodetic monument if all you care about
is timing. But it does matter if you're trying to track continental drift.

Michael

On Tue, 20 Jun 2017 at 10:44 pm, Michael Wouters 
wrote:

> Since 1cm of motion is equivalent to 30ps, there's probably not
>
> On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges  wrote:
>
>> If that is not time-nutty, I do not know what will :)
>>
>> On Jun 20, 2017 7:04 AM, "jimlux"  wrote:
>>
>> >
>> > for geodetic measurements, they drill a hole down to bedrock, and run a
>> > pipe down to anchor the antenna to the bedrock.
>> >
>> > "All holes shall be drilled straight enough so that PVC casing can be
>> > installed in the top 15.5 ft of each hole, and that the steel pipe can
>> be
>> > freely lowered, not forced, for its entire 35 ft length."
>> >
>> > http://kb.unavco.org/kb/article/deep-drilled-braced-monument
>> > -overview-300.html
>> > http://www.scign.org/arch/sdb_monument.htm
>> >
>> >
>> > Google for Ken Hudnutt's or Frank Webb's papers
>> >
>> >
>> > or a 3m tall monument for a CORS station
>> >
>> > http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
>> >
>> > ___
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>> > ailman/listinfo/time-nuts
>> > and follow the instructions there.
>> >
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Re: [time-nuts] GPS Antenna on Tower.

[Michael Wouters]

Since 1cm of motion is equivalent to 30ps, there's probably not

On Tue, 20 Jun 2017 at 10:11 pm, Didier Juges  wrote:

> If that is not time-nutty, I do not know what will :)
>
> On Jun 20, 2017 7:04 AM, "jimlux"  wrote:
>
> >
> > for geodetic measurements, they drill a hole down to bedrock, and run a
> > pipe down to anchor the antenna to the bedrock.
> >
> > "All holes shall be drilled straight enough so that PVC casing can be
> > installed in the top 15.5 ft of each hole, and that the steel pipe can be
> > freely lowered, not forced, for its entire 35 ft length."
> >
> > http://kb.unavco.org/kb/article/deep-drilled-braced-monument
> > -overview-300.html
> > http://www.scign.org/arch/sdb_monument.htm
> >
> >
> > Google for Ken Hudnutt's or Frank Webb's papers
> >
> >
> > or a 3m tall monument for a CORS station
> >
> > http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
> >
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> > and follow the instructions there.
> >
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Re: [time-nuts] GPS Antenna on Tower.

[Wes]

It was bright sunshine and 46 degrees C here in the desert near Tucson, Arizona 
yesterday.  It would take a lot of cooling to keep that solar collector (radome) 
cool.


Wes Stewart

 On 6/19/2017 9:42 PM, Thorbjørn Pedersen wrote:

http://www.sp.se/en/index/resources/GNSS/Sidor/default.aspx
Have a look at the best receiving antenna I know about.

The tower must have cooling tubes coiled around it because of the sun heating 
one side will make it bend away from the sun, and turn this way all day.
The cable and doom is also temperature controlled.

Best Regards

Thorbjørn W. Pedersen


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Re: [time-nuts] GPS Antenna on Tower.

[Clay Autery]

LOL!!!  My first reaction to reading the drill for sub-subterranean GPS
mast was...

Wonder if I could borrow Shappell's little drilling rig to do THAT hole
and the vertical wells for the geo-thermal cooling loops?

Followed closely by...

Wonder what kind and number of Sorbothan, et al. dampers required to
damp the locally generated vibrations that would resonate in that length
"tuning fork" hooked to the bedrock?

  Even we non-scientists on this reflector reserve the right
to be equally nutty.  

PS - I have a master map of my back yard in order to manage the
available square footage and its use and to de-conflict the
sub-subterranean "air space".

__
Clay Autery, KY5G

On 6/20/2017 7:21 AM, jimlux wrote:
> On 6/20/17 5:11 AM, Didier Juges wrote:
>> If that is not time-nutty, I do not know what will :)
>
> if you're a "real time-nut" you drill your own holes - you buy a
> surplus drilling rig, refurbish it, figure out how to work it (maybe
> there's a "drill-nuts" list?), etc.
>
> But at least the station will probably fit in your backyard.
>

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Re: [time-nuts] Halcyon OFS

[Clay Autery]

I've learned NEVER to start a new task on "Friday afternoon", unless I
want to work on that task thru Monday morning.  

__
Clay Autery, KY5G

On 6/20/2017 3:36 AM, Stephen Tompsett wrote:
> It's a Friday afternoon job!
WOW!!!  That was a LOT to trim off!!!
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Re: [time-nuts] GPS Antenna on Tower.

[jimlux]

On 6/20/17 5:11 AM, Didier Juges wrote:

If that is not time-nutty, I do not know what will :)


if you're a "real time-nut" you drill your own holes - you buy a surplus 
drilling rig, refurbish it, figure out how to work it (maybe there's a 
"drill-nuts" list?), etc.


But at least the station will probably fit in your backyard.



On Jun 20, 2017 7:04 AM, "jimlux"  wrote:



for geodetic measurements, they drill a hole down to bedrock, and run a
pipe down to anchor the antenna to the bedrock.

"All holes shall be drilled straight enough so that PVC casing can be
installed in the top 15.5 ft of each hole, and that the steel pipe can be
freely lowered, not forced, for its entire 35 ft length."

http://kb.unavco.org/kb/article/deep-drilled-braced-monument
-overview-300.html
http://www.scign.org/arch/sdb_monument.htm


Google for Ken Hudnutt's or Frank Webb's papers


or a 3m tall monument for a CORS station

http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf

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Re: [time-nuts] GPS Antenna on Tower.

[Didier Juges]

If that is not time-nutty, I do not know what will :)

On Jun 20, 2017 7:04 AM, "jimlux"  wrote:

>
> for geodetic measurements, they drill a hole down to bedrock, and run a
> pipe down to anchor the antenna to the bedrock.
>
> "All holes shall be drilled straight enough so that PVC casing can be
> installed in the top 15.5 ft of each hole, and that the steel pipe can be
> freely lowered, not forced, for its entire 35 ft length."
>
> http://kb.unavco.org/kb/article/deep-drilled-braced-monument
> -overview-300.html
> http://www.scign.org/arch/sdb_monument.htm
>
>
> Google for Ken Hudnutt's or Frank Webb's papers
>
>
> or a 3m tall monument for a CORS station
>
> http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf
>
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Re: [time-nuts] SR620 TCXO calibration

[Dr. David Kirkby (Kirkby Microwave Ltd)]

On 19 June 2017 at 21:43, David C. Partridge 
wrote:

> Yes please. ...
>

OK, the code is here

http://www.kirkbymicrowave.co.uk/tmp/srs-0.02.tar.gz

Note

1) It has only be tested on Solaris SPARC, with a National Instruments GPIB
card.

2) I would expect it to run under Linux, with few if any changes. If any
are needed for an NI card, please let me know. I don't mind trying to get
it to run under Linux, or any Unix system.

3) I've no idea how easy it would be to run under Windoze, and have no
intention of trying to help getting it to run under Windoze.

4) There's no man page, but there is some rudimentary in-built help, if you
run it with the wrong number of arguments. Below I run it with none, so it
generates a semi-helpful help message. It needs at least one option, and a
GPIB address. So something like

srs --time 12

would run it time-internval mode, and expect to find the SR620 on address
12.

I've NOT distributed this before, and have made no attempt to clean it up
to consider it in a fit state to distribute. But feel free to try it. Send
any comments directly to me.

Consider it released under the GPL version 2, or at your option any later
version.

drkirkby@buzzard:~/srs-0.02/src$ ./srs
srs - Version 0.02, by David Kirkby, G8WRB, drkir...@kirkbymicrowave.co.uk
Dumps data from a Stanford Research SR620 time-interval counter
Usage: srs [options] GPIB_address
**MODE**
  --time
  --width
  --risefall
  --frequency (or use --freq)
  --phase
  --count

**SOURCE (or start)**
  --A
  --B
  --reference (or use --ref)
  --ratio

**SAMPLE SIZE**
  --size n (n=1 to 100)

**DISPLAY**
  --mean
  --rel
  --jitter
  --max
  --min
  --trig
  --dvm
**OTHERS**
  --autocal
  --readcalbyte n
  --setcalbyte n m (sets calbye n to the value m)
  --settimebase (Put 10 MHz into input A before running this, to correct
the timebase)
  --help
  -h, --help
  -v, --version
  -V, --verbose
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Re: [time-nuts] GPS Antenna on Tower.

[jimlux]

for geodetic measurements, they drill a hole down to bedrock, and run a 
pipe down to anchor the antenna to the bedrock.


"All holes shall be drilled straight enough so that PVC casing can be 
installed in the top 15.5 ft of each hole, and that the steel pipe can 
be freely lowered, not forced, for its entire 35 ft length."


http://kb.unavco.org/kb/article/deep-drilled-braced-monument-overview-300.html
http://www.scign.org/arch/sdb_monument.htm


Google for Ken Hudnutt's or Frank Webb's papers


or a 3m tall monument for a CORS station

http://www.mwrtk.net/support_docs/corsinstallprocedures.pdf

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Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

[Bruce Griffiths]

Its somewhat difficult to achieve a 1Megohm input with just a bipolar 
comparator input stage especially if AC coupling is required.

Bruce

> 
> On 20 June 2017 at 19:20 Attila Kinali  wrote:
> 
> Hi,
> 
> I had a look at the PM668x[1] and CNT-90[2] schematics yesterday and
> noticed one thing: The input stages are strikingly similar to the
> SR620[3] (down to the parts used) and all of them have a gain 1 amplifier
> infront of the comparator. The PM668x service manual explicitly calls it
> "impedance converter", even. Now, if the downstream circuit would be low
> impedance, I could understand that, but the sink is a comparator with a
> high impedance input (only a few µA input current). I am sure the 
> engineers
> had a good reason to add those amplifiers, but I cannot guess why. Would
> someone be so kind and enlighten me?
> 
> Attila Kinali
> 
> [1] 
> http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Fluke/Fluke_PM6681_Service_Manual.pdf
> [2] http://assets.fluke.com/manuals/6690smeng.pdf
> [3] 
> http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Stanford_Research_Systems/SR620_Universal_Time_Interval_Counter_Schematics.pdf
>  
> http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Stanford_Research_Systems/SR620_Universal_Time_Interval_Counter_Schematics.pdf
> 
> --
> It is upon moral qualities that a society is ultimately founded. All
> the prosperity and technological sophistication in the world is of no
> use without that foundation.
> -- Miss Matheson, The Diamond Age, Neil Stephenson
> 
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Re: [time-nuts] SR620/PM66xx/CNT-90 input stages

[Li Ang]

Hi
 I think the purpose is to get high input impedance for high frequency signal. 
The input impedance of comparator is high at low frequency range only.


Li Ang / BI7LNQ
---Original---
From: "Attila Kinali"
Date: 2017/6/20 15:20:44
To: "Discussion of precise time and frequency measurement";
Subject: [time-nuts] SR620/PM66xx/CNT-90 input stages


Hi,

I had a look at the PM668x[1] and CNT-90[2] schematics yesterday and
noticed one thing: The input stages are strikingly similar to the
SR620[3] (down to the parts used) and all of them have a gain 1 amplifier
infront of the comparator. The PM668x service manual explicitly calls it
"impedance converter", even. Now, if the downstream circuit would be low
impedance, I could understand that, but the sink is a comparator with a
high impedance input (only a few µA input current). I am sure the engineers
had a good reason to add those amplifiers, but I cannot guess why. Would
someone be so kind and enlighten me?

Attila Kinali

[1] 
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Fluke/Fluke_PM6681_Service_Manual.pdf
[2] http://assets.fluke.com/manuals/6690smeng.pdf
[3] 
http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Stanford_Research_Systems/SR620_Universal_Time_Interval_Counter_Schematics.pdf

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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Re: [time-nuts] Halcyon OFS

[Stephen Tompsett]

It's a Friday afternoon job!


On 19/06/2017 18:26, Clint Jay wrote:
> It seems I have a hybrid, on the front panel it's an OFS-1, on the serial
> number label it's an OFS-1A and on the PCB it's an OFS-2.
>
> http://imgur.com/a/brRou
>
> On 19 June 2017 at 17:40, Ole Stender Nielsen  wrote:
>
>> I got a Halcyon OFS-1 a while back, and found it was virtually impossible
>> to use here in Denmark, which seems to be located too far away from the
>> Allouis (162 kHz) or Droitwich (198 kHz) transmitter sites. One major
>> design flaw of the OFS-1 is the digital divider used to divide an analog
>> signal.
>> You can find more information about an experimental modification to
>> increase the robustness and usefulness of the OFS-1 here:
>> http://dabbledoo.weebly.com/halcyon-ofs-1.html
>>
>> Best regards
>> Ole
>>
>>
>>
>> Den 19-06-2017 kl. 17:15 skrev Clint Jay:
>>
>>> Mine is somewhat different to that model, the case is the same as the
>>> leftmost one but the board is quite different to the middle picture.
>>>
>>> I'll post some links to pictures of the internals and start drawing out
>>> the
>>> circuit over the coming few days.
>>>
>>>
>>>
>>>
>>> On 19 June 2017 at 14:29, paul swed  wrote:
>>>
>>> Great pix can be found here and absolutely can easily be reverse
 engineered.
 https://www.vintage-radio.net/forum/showthread.php?t=97999
 Very simple straight forward design.
 Regards
 Paul
 WB8TSL

 On Mon, Jun 19, 2017 at 9:25 AM, paul swed  wrote:

 Hello to the group. I suspect I will never see such a unit in the states.
> Also it wouldn't be useful.
> But that said its sounds as though its a traditional simple receiver
> that
> should be able to be reverse engineered. At least for the signal and
> locking chain. If a micro is involved then things get fuzzy fast. Anyhow
> good luck with you digging in.
> Regards
> Paul
> WB8TSL
>
> On Mon, Jun 19, 2017 at 8:27 AM, Clint Jay  wrote:
>
> Thank you Stephen, Nigel, I'll take some pictures of the board in my
> OFS-1
> but it doesn't match any of the pictures I've tracked down so far.
>> Interesting that the board mounted on the rear of the enclosure with
>> the
>> trimmers appears to be Vero or perf board of some description...
>>
>> On 19 June 2017 at 11:54, Stephen Tompsett (G8LYB) <
>>
> step...@tompsett.net>
> wrote:
>> I have a little Halcyon information I managed to find a few years ago
>>> when I acquired a couple of PFS units. It includes a brief document on
>>> OFS alignment.
>>>
>>> I'll mail the documentation to you directly...
>>>
>>>
>>> On 19/06/2017 10:17, Clint Jay wrote:
>>>
 I have been given a Halcyon Electronics OFS1 standard which seems to

>>> work,
>>>
 it's a version that has 198KHz and 162KHz selector on the fron and

>>> after
>>> a
>>>
 reasonable period of time it displays 'lock' and gives a nicely

>>> stable
> 1,10
 and 10 MHz output on the front panel BNCs, (I know, it should be 1,5

>>> and
>>> 10MHz out, read on)
 Does anyone know of a PDF manual? This version has two KHz crystals

>>> inside
>>>
 it and I'd like to see how/if it's been modified so a manual with a
 schematic would be even more useful.


 --
>>> Stephen Tompsett (G8LYB)
>>> Tel: 01788 578940
>>> Mob: 07956 855816
>>>
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>>>
>> --
>> Clint.
>>
>> *No trees were harmed in the sending of this mail. However, a large
>>
> number
> of electrons were greatly inconvenienced.*
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>>>
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>

-- 
Stephen Tompsett

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[time-nuts] SR620/PM66xx/CNT-90 input stages

[Attila Kinali]

Hi,

I had a look at the PM668x[1] and CNT-90[2] schematics yesterday and
noticed one thing: The input stages are strikingly similar to the
SR620[3] (down to the parts used) and all of them have a gain 1 amplifier
infront of the comparator. The PM668x service manual explicitly calls it
"impedance converter", even. Now, if the downstream circuit would be low
impedance, I could understand that, but the sink is a comparator with a
high impedance input (only a few µA input current). I am sure the engineers
had a good reason to add those amplifiers, but I cannot guess why. Would
someone be so kind and enlighten me?

Attila Kinali

[1] 
http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Fluke/Fluke_PM6681_Service_Manual.pdf
[2] http://assets.fluke.com/manuals/6690smeng.pdf
[3] 
http://www.ko4bb.com/getsimple/index.php?id=download=02_GPS_Timing/Stanford_Research_Systems/SR620_Universal_Time_Interval_Counter_Schematics.pdf

-- 
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the prosperity and technological sophistication in the world is of no 
use without that foundation.
 -- Miss Matheson, The Diamond Age, Neil Stephenson
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