Re: [time-nuts] TruePosition on the Arduino

[Tom Miller]

We do not have the source code. Just two binary versions, one with the 
display and one without.


Regards


- Original Message - 
From: "EB4APL" 

To: 
Sent: Sunday, June 25, 2017 9:05 PM
Subject: Re: [time-nuts] TruePosition on the Arduino


Maybe I'm missing something, but Arduino programs are usually
distributed as source code. If this is the case, the I2C address of the
display should be not a problem.  If the problem is due to the display
library used, you can use another library that can be initialized with
the right address.
I'm curious about the real problem.

Regards,
Ignacio, EB4APL


El 26/06/2017 a las 2:29, Tom Miller escribió:
This is an update to discussions off list with Ben and Chris regarding 
using the two line, 16 character display with the Packrats software on the 
Arduino to control the TruePosition GPS board.


First, the ebay seller still has a few boards left and seems to take 
offers of $40 for them.


Second, the display used with the Packrats software must use the I2C 
address of 0x3F to work. The display needs to use the PCF8574AT I2C I/O 
expander chip and not the PCF8574T. The later chip addresses between 0x20 
to 0x27 and will not work with this software.


Third, I picked up some of the "A" chips on ebay and they were marked as A 
chips but addressed wrong. If you are going to change out this expander 
chip, get them from someone like Mouser.


Next step is to find a suitable housing for this assembly.

Thanks all,
Tom


- Original Message - From: "Ben Hall" 
To: "Discussion of precise time and frequency measurement" 


Sent: Tuesday, June 06, 2017 7:46 PM
Subject: [time-nuts] TruePosition on the Arduino



Good evening all,

There is a saying: "a man with one watch knows the time, a man with two 
is never sure."  Clearly, this man wasn't a timenut and didn't have GPS. 
;)


I've been working on the Arduino code for the TruePosition boards that 
quite a few of us have bought from the e-place.


It's my first real foray into both Arduino and the C language. (About a 
million years ago I was reasonably competent with FORTRAN...the 1977 
version...)  It's mostly working - I can receive and display pretty much 
everything that comes out of the unit minus a few parameters.  I can 
display it all on three pages on a 4 line by 20 character I2C display. 
Currently, the pages are selected by grounding out one of two pins, or 
having nothing grounded.  Eventually, I'm going to change this so that it 
changes display pages when a button is pressed.  I don't have lat/long 
display yet, nor can I handle doing a survey, but those are coming.


My code probably would make a real programmer vomit, but hey, it works. 
:)


Back to the man with multiple watches.  I was having a very frustrating 
issue with my TruePosition and Arduino code being one second behind my 
other sources of time.  I went round and round, trying to figure out why 
the TruePosition thru the Arduino was a second slow.  In the end, it 
turns out that it wasn't slow...it was correct...but that my other 
sources of time have errors.


I finally proved this to myself by firing up an old Trimble Lassen LP GPS 
board unit equipped with a 1PPS tick light and serial output...and it was 
clear that it matched the TruePosition after correcting for the fact that 
my TruePosition / Arduino code only updates the display when 1PPS is 
asserted high...but that the Lassen LP displays the serial message before 
it becomes valid at the next 1PPS tick.


I was slightly embarrassed...I should have known that the other sources 
of time all had sources of error beyond my control.  I should have 
trusted the TruePosition as being the purest, least complicated, and the 
path I knew the most about between GPS and my eyeballs.


So for a while...the statement was true.  With my multiple sources of 
time...I really didn't know the time.  But it was also untrue, as when I 
got agreement between two very "pure" sources of time, I knew everything 
else was wrong.  ;)


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
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Re: [time-nuts] TruePosition on the Arduino

[EB4APL]

Maybe I'm missing something, but Arduino programs are usually 
distributed as source code. If this is the case, the I2C address of the 
display should be not a problem.  If the problem is due to the display 
library used, you can use another library that can be initialized with 
the right address.

I'm curious about the real problem.

Regards,
Ignacio, EB4APL


El 26/06/2017 a las 2:29, Tom Miller escribió:
This is an update to discussions off list with Ben and Chris regarding 
using the two line, 16 character display with the Packrats software on 
the Arduino to control the TruePosition GPS board.


First, the ebay seller still has a few boards left and seems to take 
offers of $40 for them.


Second, the display used with the Packrats software must use the I2C 
address of 0x3F to work. The display needs to use the PCF8574AT I2C 
I/O expander chip and not the PCF8574T. The later chip addresses 
between 0x20 to 0x27 and will not work with this software.


Third, I picked up some of the "A" chips on ebay and they were marked 
as A chips but addressed wrong. If you are going to change out this 
expander chip, get them from someone like Mouser.


Next step is to find a suitable housing for this assembly.

Thanks all,
Tom


- Original Message - From: "Ben Hall" 
To: "Discussion of precise time and frequency measurement" 


Sent: Tuesday, June 06, 2017 7:46 PM
Subject: [time-nuts] TruePosition on the Arduino



Good evening all,

There is a saying: "a man with one watch knows the time, a man with 
two is never sure."  Clearly, this man wasn't a timenut and didn't 
have GPS.  ;)


I've been working on the Arduino code for the TruePosition boards 
that quite a few of us have bought from the e-place.


It's my first real foray into both Arduino and the C language. (About 
a million years ago I was reasonably competent with FORTRAN...the 
1977 version...)  It's mostly working - I can receive and display 
pretty much everything that comes out of the unit minus a few 
parameters.  I can display it all on three pages on a 4 line by 20 
character I2C display. Currently, the pages are selected by grounding 
out one of two pins, or having nothing grounded.  Eventually, I'm 
going to change this so that it changes display pages when a button 
is pressed.  I don't have lat/long display yet, nor can I handle 
doing a survey, but those are coming.


My code probably would make a real programmer vomit, but hey, it 
works. :)


Back to the man with multiple watches.  I was having a very 
frustrating issue with my TruePosition and Arduino code being one 
second behind my other sources of time.  I went round and round, 
trying to figure out why the TruePosition thru the Arduino was a 
second slow.  In the end, it turns out that it wasn't slow...it was 
correct...but that my other sources of time have errors.


I finally proved this to myself by firing up an old Trimble Lassen LP 
GPS board unit equipped with a 1PPS tick light and serial 
output...and it was clear that it matched the TruePosition after 
correcting for the fact that my TruePosition / Arduino code only 
updates the display when 1PPS is asserted high...but that the Lassen 
LP displays the serial message before it becomes valid at the next 
1PPS tick.


I was slightly embarrassed...I should have known that the other 
sources of time all had sources of error beyond my control.  I should 
have trusted the TruePosition as being the purest, least complicated, 
and the path I knew the most about between GPS and my eyeballs.


So for a while...the statement was true.  With my multiple sources of 
time...I really didn't know the time.  But it was also untrue, as 
when I got agreement between two very "pure" sources of time, I knew 
everything else was wrong.  ;)


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
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Re: [time-nuts] TruePosition on the Arduino

[Tom Miller]

This is an update to discussions off list with Ben and Chris regarding using 
the two line, 16 character display with the Packrats software on the Arduino 
to control the TruePosition GPS board.


First, the ebay seller still has a few boards left and seems to take offers 
of $40 for them.


Second, the display used with the Packrats software must use the I2C address 
of 0x3F to work. The display needs to use the PCF8574AT I2C I/O expander 
chip and not the PCF8574T. The later chip addresses between 0x20 to 0x27 and 
will not work with this software.


Third, I picked up some of the "A" chips on ebay and they were marked as A 
chips but addressed wrong. If you are going to change out this expander 
chip, get them from someone like Mouser.


Next step is to find a suitable housing for this assembly.

Thanks all,
Tom


- Original Message - 
From: "Ben Hall" 
To: "Discussion of precise time and frequency measurement" 


Sent: Tuesday, June 06, 2017 7:46 PM
Subject: [time-nuts] TruePosition on the Arduino



Good evening all,

There is a saying: "a man with one watch knows the time, a man with two is 
never sure."  Clearly, this man wasn't a timenut and didn't have GPS.  ;)


I've been working on the Arduino code for the TruePosition boards that 
quite a few of us have bought from the e-place.


It's my first real foray into both Arduino and the C language.  (About a 
million years ago I was reasonably competent with FORTRAN...the 1977 
version...)  It's mostly working - I can receive and display pretty much 
everything that comes out of the unit minus a few parameters.  I can 
display it all on three pages on a 4 line by 20 character I2C display. 
Currently, the pages are selected by grounding out one of two pins, or 
having nothing grounded.  Eventually, I'm going to change this so that it 
changes display pages when a button is pressed.  I don't have lat/long 
display yet, nor can I handle doing a survey, but those are coming.


My code probably would make a real programmer vomit, but hey, it works. 
:)


Back to the man with multiple watches.  I was having a very frustrating 
issue with my TruePosition and Arduino code being one second behind my 
other sources of time.  I went round and round, trying to figure out why 
the TruePosition thru the Arduino was a second slow.  In the end, it turns 
out that it wasn't slow...it was correct...but that my other sources of 
time have errors.


I finally proved this to myself by firing up an old Trimble Lassen LP GPS 
board unit equipped with a 1PPS tick light and serial output...and it was 
clear that it matched the TruePosition after correcting for the fact that 
my TruePosition / Arduino code only updates the display when 1PPS is 
asserted high...but that the Lassen LP displays the serial message before 
it becomes valid at the next 1PPS tick.


I was slightly embarrassed...I should have known that the other sources of 
time all had sources of error beyond my control.  I should have trusted 
the TruePosition as being the purest, least complicated, and the path I 
knew the most about between GPS and my eyeballs.


So for a while...the statement was true.  With my multiple sources of 
time...I really didn't know the time.  But it was also untrue, as when I 
got agreement between two very "pure" sources of time, I knew everything 
else was wrong.  ;)


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
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[Adrian Godwin]

On Fri, Jun 23, 2017 at 1:36 AM, Mark Sims  wrote:

>
> I also have some CH3xx dongles that have some clone chips in them.  Many
> Linux drivers don't seem to be able to set the baud rate on those.
>
>
I looked into this when I was struggling with a CH3xx interface recently.
It appears to be OK if you have a 4.0 or higher kernel. Unfortunately this
doesn't include what was until recently the current Debian distribution,
jessie. However, the version released a few days ago (stretch) should be OK.
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Re: [time-nuts] Power connectors continued

[Adrian Godwin]

Working in motorsport, we used the Deutsch Autosport series. They're based
on military connectors but are lighter and possibly cheaper. Still far from
cheap, but high density, high reliability and MUCH easier to assemble than
Lemos. Usually crimped pins and raychem heatshrink cable entry.

https://www.prowireusa.com/c-6-deutsch-autosport.aspx

On Sun, Jun 25, 2017 at 1:12 AM, Bob kb8tq  wrote:

> Hi
>
> If you have a phase noise under vibration requirement, you do *not* want
> to use
> the “D connector” setup. Go with an SMA ….
>
> Bob
>
> > On Jun 24, 2017, at 7:54 PM, Didier Juges  wrote:
> >
> > I have been forced to use micro-D by a customer on a military power
> supply,
> > not even space rated, it was well over $100 each in 50 piece quantity (I
> > think it was a 25 pin).
> >
> > However, unless they are mistreated (which is easy for the reason you
> > listed), they seem reliable. I do not believe we have replaced one in
> over
> > 400 units shipped and a 15 year period (aside from a couple of prototypes
> > that went through hell). That must be one of our better customers...
> >
> > The design choice of protecting the pin instead of the socket is
> baffling.
> >
> >
> > On Jun 23, 2017 7:03 PM, "jimlux"  wrote:
> >
> > On 6/22/17 4:22 PM, William H. Fite wrote:
> >
> >> A good friend of mine, sadly of blessed memory, was a lead engineer for
> >> Grumman on the comm systems of the lunar lander. He spoke of small
> >> space-rated multi-pin connectors that cost upward of $500 each.
> >>
> >>
> >> The Micro-D is widely used in spaceflight, and is a pox on the connector
> > world - not only are they expensive, the way the pins and jacks are made
> is
> > almost asking for damage - the pin is shrouded in a hole, and the jack is
> > exposed. $100 for a 9 pin wouldn't surprise me.
> >
> > Lately, I've been encountering nano-D (Glenair, Omnetics) - they're not
> as
> > delicate, they're smaller.
> >
> >
> >
> >
> >
> >
> >> On Thursday, June 22, 2017, Arnold Tibus  wrote:
> >>
> >>
> >>> Hello,
> >>>
> >>> I can second Magnus and want to throw in some more details.
> >>> Cannon, Deutsch, Bendix, Souriau, Matrix, Amphenol,  etc. etc. are
> (big)
> >>> companies manufacturing all kind of connectors and are  n o t
> connector
> >>> type designations! Important are the type numbers of the manufacturer
> or
> >>> higher level specification numbers.
> >>> We used in the aircraft and spacecraft business naturally the military
> >>> (MS-) numbers listed in the MIL-QPL (or eg. for Spacelab with GSFC
> spec.
> >>> no). Most types of connectors are under these numbers available from
> >>> different manufacturers, of course with different manufacturer in house
> >>> part numbers. Attention: the 'same' connectors may be bought w/o the
> >>> Mil.-spec. sheets with somewhat lesser quality. Important details are
> >>> the max. mating number, the contact resistance (e.g. 20 mOhm) and the
> >>> max. continuous current, max. Voltage, vibration resistance and
> >>> reliability etc.  Of course, this makes good connectors somewhat
> >>> 'expensive'. Hirel and non-magnetic gold plated D- subminiture type
> >>> connectors do survive e.g. the rocket launch phase (high vibrations),
> >>> vacuum and low temperatures and are still used for space projects.
> >>>
> >>
> >
> > AMP (and others) sell a lower cost version called the "Circular Plastic
> > Connector" or CPC. A coarser screw thread than the round metal MS
> > connectors.
> >
> > The round connectors (called Bendix connectors by some at JPL, because,
> of
> > course, that was the mfr for some batch of them) have a nice mil-std to
> > define them.  There's a Shell, an Insert, and pins/jacks.  You can get
> > shells and inserts with different keys and "clocking" to prevent
> mismates.
> > There are coax and triax inserts, high voltage inserts, etc.
> >
> > While they're pricey brand new, there are numerous surplus suppliers
> (Apex
> > Electronics in Sun Valley, CA used to have thousands of them).
> >
> > You can get them hermetic, vacuum tight, waterproof, locking,
> non-locking,
> > every kind dielectric imaginable, etc.
> >
> >
> >
> >
> >
> >
> >
> >>> The D-sub series of connectors was introduced by Cannon in 1952. They
> >>> are still available as standard, hirel, and non-magnetic versions. The
> >>> contacts were machined contacts forcrimping or soldering connection and
> >>> made of massive copper with gold finish. (more see e.g.
> >>> https://en.wikipedia.org/wiki/D-subminiature). Example for the
> standard
> >>> 9 pin connector designation (crimp): DEMAM-9S and DEMAM-9P. Today are a
> >>> big number of companies producing equivalent types. Cheap ones are
> >>> equipped with contacts made of sheetmetal. Nobody should expect then
> the
> >>> same spec. values as reliability, mating numbers, contact power rating
> >>> etc.
> >>> It is up to the designer of a product to be informed and select the

Re: [time-nuts] Power Connectors and D-Subs...

[Bob kb8tq]

Hi

Cost a fortune *and* can easily get you into 12 week delivery times ….

Bob

> On Jun 25, 2017, at 4:37 PM, Poul-Henning Kamp  wrote:
> 
> 
> In message <1317347843.1873959.1498418740...@mail.yahoo.com>, Ulf Kylenfall 
> via
> time-nuts writes:
> 
>> Why not take a look at mixed D-Sub connectors?
> 
> Because they cost a fortune ?
> 
> 
> -- 
> Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
> p...@freebsd.org | TCP/IP since RFC 956
> FreeBSD committer   | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] Power Connectors and D-Subs...

[Poul-Henning Kamp]

In message <1317347843.1873959.1498418740...@mail.yahoo.com>, Ulf Kylenfall via
 time-nuts writes:

>Why not take a look at mixed D-Sub connectors?

Because they cost a fortune ?


-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer   | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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[time-nuts] Latest Lady Heather

[Wes]

I asked about this before but got no response.

I know of John Miles' site where I downloaded v5 but I've seen a post by Mark 
Sims about further enhancements and wonder where I might get the latest.


Mark seems to have an "unlisted number."

Thanks,

Wes

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[time-nuts] Power Connectors and D-Subs...

[Ulf Kylenfall via time-nuts]

 
Why not take a look at mixed D-Sub connectors?There are versions with Coax, and 
also (fits same shell holes) high current pins and sleevesthat share the house 
with standard pins and sleeves.
The rest of this infra structure like shells and locking mechanismsare readily 
available. Another BIG advantage is that there are a large numberof versions 
available for direct PCB soldering. Straight and right angle.
Hermetic/moisture proof and also filtered versions as well.
But: due to the slide on/in nature of these connectors, at my work, we never 
use themfor precision timing. The requirement for Geodetic VLBI calls for pico 
second resolutionand stability.
We use N, TNC or SMA.
BNC or any other non-threaded/bayonnet connector is strictly prohibited.
Ulf - SM6GXV
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Re: [time-nuts] Tracor 527A and 10MHz reference input

[David C. Partridge]

I will add the information that my 527A is totally deaf when fed with 10MHz 
sine wave from my t hunderbolt (no 5MHz output from input stage).

D.
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed
Sent: 25 June 2017 20:36
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Tracor 527A and 10MHz reference input

Dave will guess you are sub sampling the 10 Mhz ref.
Yes it should be 4.7K. Not sure why but old military gear resistors were like 
that. Circa 1942 at least in schematics I have seen.
Regards
Paul
WB8TSL

On Sun, Jun 25, 2017 at 2:25 PM, David C. Partridge < 
david.partri...@perdrix.co.uk> wrote:

> Yes, does indeed look like it should be 4K7!
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C.
> Partridge
> Sent: 25 June 2017 18:50
> To: 'Discussion of precise time and frequency measurement'
> Subject: [time-nuts] Tracor 527A and 10MHz reference input
>
> A friend says his Tracor 527A works fine with a 10MHz Ref input even 
> though it doesn't have the divide by 2 circuit from the addendum to 
> the 527E manual applied.
>
> I'm puzzled by this - I can't quite see how the reference input 
> circuit can produce a 5MHz output when fed with 10MHz (unless his 
> reference source has a large 5MHz sub-harmonic).
>
> Am I missing something here?
>
> On a related note, the schematic for the divide by 2 circuit in the 
> front of the 527E manual shows a 4R7 resistor from the base of the 
> 2N3904 to ground - this just feels all wrong!!  Has anyone built this 
> and did they change the resistor to (e.g. 47R or 4K7)?
>
> Thanks
> Dave
>
>
>
>
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Re: [time-nuts] Tracor 527A and 10MHz reference input

[paul swed]

Dave will guess you are sub sampling the 10 Mhz ref.
Yes it should be 4.7K. Not sure why but old military gear resistors were
like that. Circa 1942 at least in schematics I have seen.
Regards
Paul
WB8TSL

On Sun, Jun 25, 2017 at 2:25 PM, David C. Partridge <
david.partri...@perdrix.co.uk> wrote:

> Yes, does indeed look like it should be 4K7!
>
> -Original Message-
> From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C.
> Partridge
> Sent: 25 June 2017 18:50
> To: 'Discussion of precise time and frequency measurement'
> Subject: [time-nuts] Tracor 527A and 10MHz reference input
>
> A friend says his Tracor 527A works fine with a 10MHz Ref input even
> though it doesn't have the divide by 2 circuit from the addendum to the
> 527E manual applied.
>
> I'm puzzled by this - I can't quite see how the reference input circuit
> can produce a 5MHz output when fed with 10MHz (unless his reference source
> has a large 5MHz sub-harmonic).
>
> Am I missing something here?
>
> On a related note, the schematic for the divide by 2 circuit in the front
> of the 527E manual shows a 4R7 resistor from the base of the 2N3904 to
> ground - this just feels all wrong!!  Has anyone built this and did they
> change the resistor to (e.g. 47R or 4K7)?
>
> Thanks
> Dave
>
>
>
>
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Re: [time-nuts] Tracor 527A and 10MHz reference input

[David C. Partridge]

Yes, does indeed look like it should be 4K7!

-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of David C. 
Partridge
Sent: 25 June 2017 18:50
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] Tracor 527A and 10MHz reference input

A friend says his Tracor 527A works fine with a 10MHz Ref input even though it 
doesn't have the divide by 2 circuit from the addendum to the 527E manual 
applied.

I'm puzzled by this - I can't quite see how the reference input circuit can 
produce a 5MHz output when fed with 10MHz (unless his reference source has a 
large 5MHz sub-harmonic).

Am I missing something here?

On a related note, the schematic for the divide by 2 circuit in the front of 
the 527E manual shows a 4R7 resistor from the base of the 2N3904 to ground - 
this just feels all wrong!!  Has anyone built this and did they change the 
resistor to (e.g. 47R or 4K7)?

Thanks
Dave




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[time-nuts] Tracor 527A and 10MHz reference input

[David C. Partridge]

A friend says his Tracor 527A works fine with a 10MHz Ref input even though
it doesn't have the divide by 2 circuit from the addendum to the 527E manual
applied.

I'm puzzled by this - I can't quite see how the reference input circuit can
produce a 5MHz output when fed with 10MHz (unless his reference source has a
large 5MHz sub-harmonic).

Am I missing something here?

On a related note, the schematic for the divide by 2 circuit in the front of
the 527E manual shows a 4R7 resistor from the base of the 2N3904 to ground -
this just feels all wrong!!  Has anyone built this and did they change the
resistor to (e.g. 47R or 4K7)?

Thanks
Dave




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Re: [time-nuts] Software for Spirent GSS4100 GPS simulator

[Scott McGrath]

As a spirent user in another context

Most Sprient software is supplied only if you subscribe to software maintenance 
which is understandable due to the limited customer base and the concomitant 
small pool of possible revenue they simply cant afford to give software away.



> On Jun 25, 2017, at 6:50 AM, Peter Vince  wrote:
> 
> Our favourite auction site has someone selling a Spirent GSS4100 GPS
> simulator cheap, "for parts", as it is untested.  I'm guessing the vendor
> has no clue HOW to test it, especially as they have no software to go with
> it, so am hoping it might actually be OK.  Worth a punt, anyway.  However,
> the download link for the "SimCHAN v2.02" software on the Spirent site
> doesn't work, and they have yet to reply to my email.  Does anyone have a
> copy of that software?  While not "freeware", it was provided with the
> equipment (on a CD), and is no use without the hardware, and vice-versa,
> and if that CD has been lost by the original hardware owner, it seems
> reasonable for the new owner to ask for a copy of said software, and so my
> conscience is clear in asking for a copy.
> 
> Thanks in advance, Peter Vince
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Re: [time-nuts] Software for Spirent GSS4100 GPS simulator

[Bob kb8tq]

Hi

The simple answer is that it’s much more simple than that :)

The 4100 and 6100 both run a very rudimentary serial command set. It’s 
not quite SCPI, but that’s the idea. With a simple terminal program (any 
terminal program ..) you can bash in the four or five lines that get it doing 
what you need to do. I have a couple of 6100’s and see absolutely no reason
why you would *want* another layer of nonsense to deal with …

The newer simulators are a different sort of beast. There it looks like you 
*do* want their software and a license key for it. They have a bunch of things 
they do that are way beyond the “single sat” simulation of the 4100 or 6100.

Bob

> On Jun 25, 2017, at 6:50 AM, Peter Vince  wrote:
> 
> Our favourite auction site has someone selling a Spirent GSS4100 GPS
> simulator cheap, "for parts", as it is untested.  I'm guessing the vendor
> has no clue HOW to test it, especially as they have no software to go with
> it, so am hoping it might actually be OK.  Worth a punt, anyway.  However,
> the download link for the "SimCHAN v2.02" software on the Spirent site
> doesn't work, and they have yet to reply to my email.  Does anyone have a
> copy of that software?  While not "freeware", it was provided with the
> equipment (on a CD), and is no use without the hardware, and vice-versa,
> and if that CD has been lost by the original hardware owner, it seems
> reasonable for the new owner to ask for a copy of said software, and so my
> conscience is clear in asking for a copy.
> 
> Thanks in advance, Peter Vince
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Re: [time-nuts] GPScon running on Raspberry Pi 3b

[timenut]

Mark,

I compiled and ran Lady Heather on my Tinker this morning. This is using the
"stretch" distribution with GCC version 6.3.0 (and of course, the current
version is 7.1.0 with more language changes). I received 8 warning messages,
the first three are a language change and remainder are "misleading
indentation" messages. To get a clean compile, I fixed the spaces and
indentation, but looking at the code it is the type of thing that I would
check to make sure that the control flow is correct - the indentation is
indeed misleading which is always a potential sign of a bug. Here are the
warning messages that I got:

   heather.cpp:13720:10: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:13720:27: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:13720:40: warning: invalid suffix on literal; C++11 requires a 
space between literal and string macro [-Wliteral-suffix]
   heather.cpp:10881:26: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heather.cpp:10883:4: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathmsc.cpp:2124:28: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathmsc.cpp:6710:24: warning: this ‘else’ clause does not guard... 
[-Wmisleading-indentation]
   heathgps.cpp:20433:7: warning: this ‘if’ clause does not guard... 
[-Wmisleading-indentation]

Also, I am waiting for my USB to RS232 adapter, so I don't have anything
plugged into the USB ports (other than keyboard and mouse). When I ran it with
./heather -4u, it first told me that it was unable to open /dev/ttyUSB0 and
then told me it was unable to open /dev/ttyUSB3. This is probably due to the
configuration file containing "-1u", but if that option is given on the
command line then the configuration file value should be ignored - or at the
least it should be tried after the command line option.

Other than the above, it looks great given that nothing is plugged in!

Thanks for the work you do maintaining this program.


Michael

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[time-nuts] Software for Spirent GSS4100 GPS simulator

[Peter Vince]

Our favourite auction site has someone selling a Spirent GSS4100 GPS
simulator cheap, "for parts", as it is untested.  I'm guessing the vendor
has no clue HOW to test it, especially as they have no software to go with
it, so am hoping it might actually be OK.  Worth a punt, anyway.  However,
the download link for the "SimCHAN v2.02" software on the Spirent site
doesn't work, and they have yet to reply to my email.  Does anyone have a
copy of that software?  While not "freeware", it was provided with the
equipment (on a CD), and is no use without the hardware, and vice-versa,
and if that CD has been lost by the original hardware owner, it seems
reasonable for the new owner to ask for a copy of said software, and so my
conscience is clear in asking for a copy.

Thanks in advance, Peter Vince
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