Re: [time-nuts] TS2100: List of root commands?

[Gerhard Wittreich]

Bruce,

The model originally spec'd for the TS-2100 MTI 240-0530-D
*.*
Here is the MRTG trace. Had a power failure in July and it settled from a
previous 36 to a new 3.  These are not absolute values but offset by 47640
to amplify the scale or changes of 1 in 65535 would not be visible.
Therefore, the current register reads 47643.






On Thu, Apr 5, 2018 at 12:36 PM, ew via time-nuts 
wrote:

> No control voltage change of an OCXO in a year  is amazing. What is the
> OCXO
> Bert Kehren
>
> In a message dated 4/5/2018 10:52:11 AM Eastern Standard Time,
> gerh...@wittreich.org writes:
>
>
>  Bruce,
>
> The link Azelio Boriani shared is the source I used when doing the same
> project. Please, post your results. MIne has been running for several years
> now without any issues. I track the OCXO control voltage register in the
> 2100. It has 65535 steps and over long periods (1 year) that control
> voltage hasn't changed. At the very beginning, it did take about 30-60 days
> for the control voltage to settle down. The only time I get a change is in
> rare situations where the unit is powered down. When it restarts it may
> settle into a different control voltage. I have the unit on a UPS and have
> backup generator for the house.
>
> Gerhard R Wittreich, P.E.
>
> On Wed, Apr 4, 2018 at 8:29 PM, Bruce Lane 
> wrote:
>
> > Fellow time-tickers,
> >
> > I just finished conversion of one of my TS2100's to OCXO, and I'm
> > now
> > in the process of tweaking the EEPROM settings.
> >
> > During my research, I came across (and, foolishly, didn't bookmark)
> > either a web page or a mailing list post which listed the 'root eng'
> > commands, and exactly how to enter them. I've been successful with 'root
> > eng ee gain' and 'root eng ee filter,' but I can't seem to get the
> > syntax down to set the D/A value.
> >
> > Does this sound at all familiar?
> >
> > Thanks much.
> >
> > --
> > ---
> > Bruce Lane, ARS KC7GR
> > http://www.bluefeathertech.com
> > kyrrin (at) bluefeathertech dot com
> > "Quando Omni Flunkus Moritati" (Red Green)
> > ___
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Re: [time-nuts] TS2100: List of root commands?

[Gerhard Wittreich]

Bruce,

The link Azelio Boriani shared is the source I used when doing the same
project. Please, post your results. MIne has been running for several years
now without any issues. I track the OCXO control voltage register in the
2100. It has 65535 steps and over long periods (1 year) that control
voltage hasn't changed. At the very beginning, it did take about 30-60 days
for the control voltage to settle down. The only time I get a change is in
rare situations where the unit is powered down. When it restarts it may
settle into a different control voltage. I have the unit on a UPS and have
backup generator for the house.

Gerhard R Wittreich, P.E.

On Wed, Apr 4, 2018 at 8:29 PM, Bruce Lane 
wrote:

> Fellow time-tickers,
>
> I just finished conversion of one of my TS2100's to OCXO, and I'm
> now
> in the process of tweaking the EEPROM settings.
>
> During my research, I came across (and, foolishly, didn't bookmark)
> either a web page or a mailing list post which listed the 'root eng'
> commands, and exactly how to enter them. I've been successful with 'root
> eng ee gain' and 'root eng ee filter,' but I can't seem to get the
> syntax down to set the D/A value.
>
> Does this sound at all familiar?
>
> Thanks much.
>
> --
> ---
> Bruce Lane, ARS KC7GR
> http://www.bluefeathertech.com
> kyrrin (at) bluefeathertech dot com
> "Quando Omni Flunkus Moritati" (Red Green)
> ___
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> mailman/listinfo/time-nuts
> and follow the instructions there.
>
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Re: [time-nuts] TS2100: From regular xtal to OCXO?

[Gerhard Wittreich]

Bruce,

Search the TimeNuts archives.  There are many posts with details on
installing the OCXO and a few minor required config changes for the
TS-2100. I did this upgrade with a

MTI 240-0530-C a few years ago and both relied on the archives and
added to the group knowledge. I suggest you search TS-2100 OCXO.


On Wed, Mar 21, 2018 at 9:21 PM, Bruce Lane 
wrote:

> Fellow Clock-Tickers,
>
> I've got a pair of Symmetricom TS2100's, both of which have the
> basic
> TTL oscillator module for their reference oscillator. As other owners of
> these units are probably aware, the board is also laid out for a couple
> of different types of OCXO.
>
> I've got what I believe are the correct OCXO's coming from an Ebay
> vendor. They match the source voltage (12VDC), the control voltage
> range, and the pinout.
>
> My question is, do I need to make any configuration changes to the
> 2100's, in terms of jumpers or anything? Or is it literally a case of
> swap-and-play?
>
> Thanks much.
>
> --
> ---
> Bruce Lane, ARS KC7GR
> http://www.bluefeathertech.com
> kyrrin (at) bluefeathertech dot com
> "Quando Omni Flunkus Moritati" (Red Green)
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Re: [time-nuts] UPDATE: Heol N024 GPS for TS-2100 Failure

[Gerhard Wittreich]

Esa,

It's more than that.  That is how mine started and eventually did not
recover.  In it's final state I was unable to query the GPS board after a
reboot.  Keep an eye on yours to be sure it doesn't get worse.

--Gerhard R Wittreich, P.E.

On Tue, Aug 18, 2015 at 5:38 PM, Esa Heikkinen tn1...@nic.fi wrote:

 Gerhard Wittreich kirjoitti:

 Heol is sending me and another timenut a new GPS board with the updated
 firmware.  If you have an early version of the board, be on the lookout
 for
 loss of Tracking as a symptom of the problem.


 If this is a same issue that I discovered, it seemed to happen at each
 Saturday evening (UTC). But there's no need to reboot anything, it will
 recover by itself, just sit back and wait... Loss of tracking event stays
 maybe about an hour or something and then it will return to normal.

 So it's only a minor problem, unless you need full PPS accuracy (+-50 ns
 with OCXO). If TS2100 is used as FTP server, this temporary loss of
 tracking doesn't matter.

 Best regards,

 --
 73s!
 Esa
 OH4KJU
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[time-nuts] UPDATE: Heol N024 GPS for TS-2100 Failure

[Gerhard Wittreich]

I heard back from Heol Design and it appears that this is not an isolated
issue and Heol is aware of the problem.  They believe that something is
causing the GPS to lose key settings.  They have updated their firmware to
reload key settings on power-up in case they had been lost.  I am a bit
concerned that, while this will offer a remedy if the problem occurs, it
will still require a periodic reboot to correct the issue.

Heol is sending me and another timenut a new GPS board with the updated
firmware.  If you have an early version of the board, be on the lookout for
loss of Tracking as a symptom of the problem.

--Gerhard R Wittreich, P.E.
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[time-nuts] Heol N024 GPS for TS-2100 Failure

[Gerhard Wittreich]

After 2-3 months of stable operation I noticed today that the Tracking
and Locked lights on my upgraded (w/ Heol Design N024 GPS board) TS-2100
were not lit.  I tried to access the GPS board but got a GPS Engine Busy
and *** err *** handshake timeout error.  Everything else appears to be
functioning.  Basic troubleshooting (ie. restart and reseating the board)
have not resolved the issue.  It looks like a GPS board failure.  I've
contact Heol Design this evening and am waiting for a reply.

I assume no one else has seen this problem.  I look forward to how they
respond.

--Gerhard R Wittreich, P.E.
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Re: [time-nuts] Symmetricom(R) TS2100-GPS update and conversion

[Gerhard Wittreich]

Greg,

I did both those upgrades a few weeks ago and have been very pleased with
the results.  Desoldering the TCXO is a bit tricky and takes some
patience.  I do not have the widget board in my TS-2100 so I'm not much
help there.

I assume you already have your OCXO...The correct one is a bit hard to find.

Gerhard R Wittreich, P.E.
N3PL


On Wed, Jul 29, 2015 at 11:08 PM, Gregory Beat w...@icloud.com wrote:

 The TymServe TS2100 arrived this afternoon.  So I started with the GPS
 receiver swap (update).

 I removed the Trimble ACE III receiver (39818-C), but noted that this
 specific unit had a widget board (65398.69) on the SMA antenna connector
 and 2 wires (DC power) to the 3-pin header on the main board.

 Was this board used to support +12 VDC powered outdoor antennas?
 
 Installed the Heol N024-TS-V2.1 receiver (ACE III clone w/corrections) and
 connected a Trimble 28367-00 GPS antenna (small mag mount) to the
 receiver's antenna port.

 From a dead cold start, in urban canyons, I had tracking in about a minute
 and lock in about 20 minutes.  So far, so good.  Next will be the TCXO to
 OCXO conversion (MTI 240-0530-D).

 greg
 w9gb

 Sent from iPad Air
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Re: [time-nuts] Firmware for TymServe 2100

[Gerhard Wittreich]

Sean,

I have it (but not with me) and can send it directly to you this evening.
I will also gladly post if anyone else is interested.

Gerhard R Wittreich, P.E.

On Thu, Jun 11, 2015 at 9:38 AM, Sean Gallagher s...@wetstonetech.com
wrote:

 Does anyone have v4.1 of the firmware for the 2100 they wouldn't mind
 sending me?

 With the new Heol GPS receivers on the way I would like to test it on the
 different firmware versions but I can only seem to find my v3.1.

 Respectfully,

 Sean Gallagher
 Malware Analyst
 571-340-3475
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Re: [time-nuts] TymServe 2100 and the 1995 GPS issue

[Gerhard Wittreich]

Very good point...It is a new oscillator that has been sitting in a box for
10-15 years.  I'll give it a few weeks to settle in.  The other very
interesting thing I noticed was the variability in the oscillator control
voltage before and after installing the new Heol Design GPS.  The moving
average of the standard deviation of the oscillator control voltage before
and after installing the Heol Design gps was striking.  The variability of
the control voltage for the Heal Design is nearly 1/3 of that for the
original Trimble gps.  That suggests that the pps signal from the new gps
module has 1/3 the variability vs the original gps module.  I did consider
that this could be due to the new oscillator aging but when I do a linear
regression on the standard error of the control voltage before replacing
the gps module the p-value for the slope of the line is about 0.5
suggesting that the null hypothesis, that the slope is actually zero,
cannot be rejected.  Therefore, one would need to conclude that there is no
change if control voltage variability vs time prior to the installation of
the new gps module and, consequently, there was no change in the stability
of the new oscillator (since everything else remained unchanged).

Unfortunately, I do not have sufficient run time on the new gps module to
reach any meaningful conclusion of variability vs time.  If anything it
still appears to be dropping at this point.  I can further update once I
get additional run time.

I also noted a very marked improvement in the satellite signal strength
reported by the TS-2100.  While I don't have any statistically sound data
my observation is that the signal strengths are significantly higher and
there are always more viable satellites in view.  In the past I would never
see more that 6-8 with 4-6 having sufficient signal strength.  Now I
routinely see 10 with 6 - 8 having sufficient signals strength.

[image: Inline image 1]
Note: The straight lines represent the mean value and are not linear
regression although the linear regression and the mean line are very nearly
the same for the original GPS data.  I suspect the same will happen once I
get some run time with the new GPS.  Both imply that there is little time
dependence, in the short term, on control voltage variability.

Gerhard R Wittreich, P.E.

On Tue, Jun 9, 2015 at 8:59 AM, Esa Heikkinen tn1...@nic.fi wrote:

 Gerhard Wittreich kirjoitti:

  Once locked I did notice
 something interesting but maybe not important.  The control voltage to the
 oscillator (timing  util  tfp 0) went from a very consistent 0xba6f to a
 0xbb02.  That's about 0.2% of scale.  I'll watch it over the next few days
 to see where it settles in.


 Sounds like oscillator aging to me, sometimes they do larger jumps, stay
 there for a while and then again... Also it would not be suprising that
 this would happen just after the power was off and oven was cooled down for
 a moment.

 Also, brand new oscillators seem to age more rapidly at start and then
 settles down when older but the effects of aging will never stop
 completely. But they seem to get better and better when aging.

 I'm also waiting my MTI OCXO to arrive...

 --
 73s!
 Esa
 OH4KJU

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Re: [time-nuts] TymServe 2100 and the 1995 GPS issue

[Gerhard Wittreich]

I just received the Heol Design N024 Trimble ACE III clone to resolve the
week rollover problem we have been experiencing in the TS-2100's with the
original Trimble ACE III gps units.  Installation was very straight forward
taking about 5 minutes.  On a cold restart I had Tracking within 40
seconds with the correct date and time (Leap second issue also resolved)
and Locked with my new OCXO in ~20 minutes.  Once locked I did notice
something interesting but maybe not important.  The control voltage to the
oscillator (timing  util  tfp 0) went from a very consistent 0xba6f to a
0xbb02.  That's about 0.2% of scale.  I'll watch it over the next few days
to see where it settles in.

Gerhard R Wittreich, P.E.

On Thu, Jun 4, 2015 at 11:38 AM, Sean Gallagher s...@wetstonetech.com
wrote:

 Hey everyone,

 Just wanted to send this out.

 It is The documentation that Heol has sent me regarding the GPS
 replacement boards in the 2100. According to them so far they were able to
 correct the issues with some fancy firmware on their N024 board. He also
 told me they are going to support firmware updates up to 2035 in case more
 issues arise.

 He is sending me one of these new units and should arrive within the next
 2 weeks and I'll let you know if it works in my 2100's and my
 Datum/Symmetricom BC635pci cards.

 Respectfully,

 Sean Gallagher
 Malware Analyst
 571-340-3475

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Re: [time-nuts] TymServe 2100 OCXO (MTI 240-0530-D)

[Gerhard Wittreich]

I completed the TCXO to OCXO (MTI 240-0530-D) upgrade yesterday with no
issues.  TCXO is a bit troublesome to remove (Four through the hole
mounts.  Can made stiff and difficult to move any corner much.  Slowly
worked my way around the four mounts repeatedly until they came loose.) but
a bit of patience goes a long way.  You will need to de-solder the mounting
holes for the OCXO but that went well.  On restart I updated the two
setting Jason Rabel indicated in his Mar 30 2011 post on [Time-Nuts]:

OCXO (MTI 240-0530-D)
-
gain = -20
filter = 0.9995000

and then wrote that to eeprom using:

eng eeprom gain -20

eng eeprom filter 0.9995

Make sure to short jumper JP4 on the board so the eeprom write will
work.  After restart the OCXO took about 3 hours to stabilize before
Locked status was achieved.
I did a cold restart (Power Off -- Power On did not wait for the OCXO
to cool down) after 24 hours and got Locked status in less than 20
min.
Now waiting on the new Trimble III clone from Heol to finish the upgrade.

Gerhard R Wittreich, P.E.



On Wed, Jun 3, 2015 at 3:49 PM, Andrew Cooper acoo...@keck.hawaii.edu
wrote:

 Keep us updated on any progress (or pitfalls here).  I just installed our
 new MicroSemi S350's a few minutes ago;) and pulled a couple TS2100's out
 of the rack.  We would like to update these and have one of the Heol GPS
 units on order.  Ours have OXCO's already, so it should just be the GPS.

 Andrew

 -Original Message-
 From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Gerhard
 Wittreich
 Sent: Wednesday, June 03, 2015 4:14 AM
 To: Discussion of precise time and frequency measurement
 Subject: Re: [time-nuts] TymServe 2100 OCXO (MTI 240-0530-D)

 I'm giving the entire rebuild a try including the Ace Trimble III clone
 form Heol Design.  I'm not sure it is practical but I like the idea of
 keeping an old unit running.  I read the post you mentioned which does a
 nice job of discussing the firmware settings.  I was hoping for some
 practical tips on removing and reinstalling the oscillators.  Is it a
 straight forward desolder/resolder?  Is there an insulating pad (thermal or
 electrical) under the OCXO?  Any pitfalls?

 Gerhard R Wittreich, P.E.


 On Tue, Jun 2, 2015 at 10:41 PM, Robert Watzlavick roc...@watzlavick.com
 wrote:

  See the thread titled Upgrading TS2100 from TCXO to OCXO around
  3/30/2011.  I used a different OCXO but one that had a compatible EFC
 range.
 
  It's funny, a few weeks ago before the TS2100s started acting up, I
  would have picked up one of those OCXOs in a heartbeat.  I've had an
  eBay watch set up for years waiting for that part.  But now I'm not so
  sure I want it anymore.
 
  -Bob
 
  On 06/02/2015 08:32 AM, Gerhard Wittreich wrote:
 
  I just discovered that a correct model MTI OCXO (MTI 240-0530-D) for
  the
  TS-2100 is currently available on eBay.  In the past MTI 240's of
  different versions have been available but unsuitable for the
  TS-2100.  Price is
  $45.99 + shipping.  I have one on the way.
 
  NEW Symmertricom BC11736-1000 MRI 240-0530-D 010285-0530-D Crystal
  Oscillator 
  http://www.ebay.com/itm/NEW-Symmertricom-BC11736-1000-MRI-240-0530-D-
  010285-0530-D-Crystal-Oscillator-/131510917585?pt=LH_DefaultDomain_0
  hash=item1e9ea959d1
  
 
  Now, has anyone replaced a stock oscillator with the correct MTI 240
  in a TS-2100?  Glad to take this off-line of the topic is not of
  general interest.
 
  Gerhard R. Wittreich, P.E.
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Re: [time-nuts] TymServe 2100 and the 1995 GPS issue

[Gerhard Wittreich]

Sean,

I have one on the way as well along with an MTI 240-0530-D OCXO.  Looks
like my TS-2100 is getting a complete makeover.  I'll provide feedback as
well.

On Thu, Jun 4, 2015 at 11:38 AM, Sean Gallagher s...@wetstonetech.com
wrote:

 Hey everyone,

 Just wanted to send this out.

 It is The documentation that Heol has sent me regarding the GPS
 replacement boards in the 2100. According to them so far they were able to
 correct the issues with some fancy firmware on their N024 board. He also
 told me they are going to support firmware updates up to 2035 in case more
 issues arise.

 He is sending me one of these new units and should arrive within the next
 2 weeks and I'll let you know if it works in my 2100's and my
 Datum/Symmetricom BC635pci cards.

 Respectfully,

 Sean Gallagher
 Malware Analyst
 571-340-3475

 ___
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 To unsubscribe, go to
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Re: [time-nuts] TymServe 2100 OCXO (MTI 240-0530-D)

[Gerhard Wittreich]

I'm giving the entire rebuild a try including the Ace Trimble III clone
form Heol Design.  I'm not sure it is practical but I like the idea of
keeping an old unit running.  I read the post you mentioned which does a
nice job of discussing the firmware settings.  I was hoping for some
practical tips on removing and reinstalling the oscillators.  Is it a
straight forward desolder/resolder?  Is there an insulating pad (thermal or
electrical) under the OCXO?  Any pitfalls?

Gerhard R Wittreich, P.E.


On Tue, Jun 2, 2015 at 10:41 PM, Robert Watzlavick roc...@watzlavick.com
wrote:

 See the thread titled Upgrading TS2100 from TCXO to OCXO around
 3/30/2011.  I used a different OCXO but one that had a compatible EFC range.

 It's funny, a few weeks ago before the TS2100s started acting up, I would
 have picked up one of those OCXOs in a heartbeat.  I've had an eBay watch
 set up for years waiting for that part.  But now I'm not so sure I want it
 anymore.

 -Bob

 On 06/02/2015 08:32 AM, Gerhard Wittreich wrote:

 I just discovered that a correct model MTI OCXO (MTI 240-0530-D) for the
 TS-2100 is currently available on eBay.  In the past MTI 240's of
 different
 versions have been available but unsuitable for the TS-2100.  Price is
 $45.99 + shipping.  I have one on the way.

 NEW Symmertricom BC11736-1000 MRI 240-0530-D 010285-0530-D Crystal
 Oscillator
 
 http://www.ebay.com/itm/NEW-Symmertricom-BC11736-1000-MRI-240-0530-D-010285-0530-D-Crystal-Oscillator-/131510917585?pt=LH_DefaultDomain_0hash=item1e9ea959d1
 

 Now, has anyone replaced a stock oscillator with the correct MTI 240 in a
 TS-2100?  Glad to take this off-line of the topic is not of general
 interest.

 Gerhard R. Wittreich, P.E.
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[time-nuts] TymServe 2100 OCXO (MTI 240-0530-D)

[Gerhard Wittreich]

I just discovered that a correct model MTI OCXO (MTI 240-0530-D) for the
TS-2100 is currently available on eBay.  In the past MTI 240's of different
versions have been available but unsuitable for the TS-2100.  Price is
$45.99 + shipping.  I have one on the way.

NEW Symmertricom BC11736-1000 MRI 240-0530-D 010285-0530-D Crystal
Oscillator
http://www.ebay.com/itm/NEW-Symmertricom-BC11736-1000-MRI-240-0530-D-010285-0530-D-Crystal-Oscillator-/131510917585?pt=LH_DefaultDomain_0hash=item1e9ea959d1

Now, has anyone replaced a stock oscillator with the correct MTI 240 in a
TS-2100?  Glad to take this off-line of the topic is not of general
interest.

Gerhard R. Wittreich, P.E.
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Re: [time-nuts] Generator MTI 260 for GPSDO

[Gerhard Wittreich]

Nick,

While I don't know how to build the GPSDO circuit I do have some recent
experience with MTI OCXO's.  The model number on your OCXO (based on the
eBay photo) is 260-0624-C.  This is not one of the base model numbers and,
therefore, indicates it is a customized version.  So to use it effectively
you may need to know what customizations were included in this specific
model.  A common customization includes changing the Tuning Voltage from
the base of -10v to +10v to some other range.  To use it in a GPSDO you
will need to know at least this information about your MTI 260.

-- Gerhard


On Tue, Oct 29, 2013 at 8:08 AM, Nick Medina poi...@mail.ru wrote:


 I have bought such generator

 http://www.ebay.com/itm/MTI-260-261-SC-CUT-5mhz-ultra-high-stability-high-reliability-ocxo-oscillator-/291005366483?pt=US_Radio_Comm_Oscillatorshash=item43c14580d3
 I want to use it for GPSDO.
 Does anybody know typical circuit of using this generator MTI260?
 Thank you

 --
 Nick Medina
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[time-nuts] TS-2100 OCXO

[Gerhard Wittreich]

In my quest to add an MTI 240 OCXO to my TS-2100 I ended up buying one on
eBay only to realize that MTI made many custom versions of the MTI 240
OCXO.  I had no idea what the specific characterisics of my MTI 240 (MTI
240-0545-C) were and how did they compare to the TS-2100 stock MTI OCXO
(MTI 240-0530-C).  I gave MTI a call and found someone willing to help.  He
dug out the data sheets for both OCXO's and even told me that the TS-2100
stock OCXO was still available and in stock.  Unfortunately, the price was
$350/ea +S/H...A bit more than I was willing to spend.

I tried to post this message to this list with the PDF's attached but the
message was reject because it exceed the 128kB limit.  If any one is
interested in these datasheets send me your direct e-mail address and I'll
forward them to you.

1.  MTI 240-0530-C  (Stock OCXO in TS-2100)

2.  MTI 240-0545-C  (Currently very available OCXO on eBay)

-- Gerhard
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Re: [time-nuts] TS-2100 gps receiver setup question

[Gerhard Wittreich]

Howard,

In a September 2008 post by Jason Rabel in reference to converting a
TS2100irig to GPS.  The original question stated that the GPS always looked
busy.  Here is his response...I wonder if this will solve your problem?

Quote

I've successfully converted my TS2100 IRIG to a GPS model along with several
other people. As far as I know, the Oncore module was never used (maybe a
planned future upgrade), but the ACE-III modules work just fine.

The trick is you need to make a temporary interface with your ACE-III and
set PORT1 to 9600 8O1 TSIP in, TSIP out. The receiver is probably set to 8N1
right now which is why it's not working. I dug through my old emails and
this bit of information might also be useful:

TSIPMonitor32 seemed to always (re)set the receiver to 9600-8N1. My
workaround was to use the Acutime TR_Monitor (set to the pallisade receiver)
to set the baud rate, then run TSIP chat and save the seeprom settings
there.

You should be able to find all those programs on the Trimble FTP server. No
need to mess with any jumpers or eeproms... Just be sure to flash your
firmware to the latest version (which is a couple years old at least I
think).


/Quote

-- Gerhard
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[time-nuts] TS2100 Firmware

[Gerhard Wittreich]

I have just purchased (eBay) a TS2100-IRIG with firmware v3.1.  I believe
v4.1 is the latest.  I requested access to the Symmetricon software
download but have not yet been approved.  Not sure what criteria they use
for approval or if the TS2100 firmware is still on their site.  Does anyone
have access to the latest firmware file and is willing to send it to me?

BTW...Inspired by this mailing list I am hoping to use a Trimble Resolution
T to convert this to a GPS unit.

-- Gerhard
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