Mark,
Saw your post about RTCM and Garmin 18LVC. If your Garmin is fairly new, it’s quite possible you’ve run into the same problem as I did. Garmin changed the specs on the unit and didn’t update any docs. The 1 PPS line coming from the new units is only 3 volts instead of 5 Volts. The RTCM is expecting 5 Volts. It is possible to modify your RTCM to accept the 3 volts, however, I still had trouble with this after the mod and never could get it working reliably. A better solution is to just use a GPS that puts out the correct levels. I am looking at moving to Symmetricom/Furano units. They can be had cheap, are already designed to be mounted outside, are RS422/RS485 outputs so can be run long distance, and are way more hardy than the little garmin puck. One little RS422->TTL converter inside, with a buffer driver behind it and you can run many RTCMs off the single GPS signal coming in. If you are installing at a repeater site, they are seem to be a good alternative to the Garmin, and are way cheaper than the Trimble. Hope that helps.
73
James KI0KN
···
---------- Forwarded message ----------
From: app_rpt-users-request@ohnosec.org
Date: Wed, Mar 30, 2016 at 9:26 AM
Subject: App_rpt-users Digest, Vol 85, Issue 52
To: app_rpt-users@ohnosec.org
Send App_rpt-users mailing list submissions to
app_rpt-users@ohnosec.org
To subscribe or unsubscribe via the World Wide Web, visit
[http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users](http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users)
or, via email, send a message with subject or body ‘help’ to
app_rpt-users-request@ohnosec.org
You can reach the person managing the list at
app_rpt-users-owner@ohnosec.org
When replying, please edit your Subject line so it is more specific
than “Re: Contents of App_rpt-users digest…”
Today’s Topics:
-
Re: Garmin GPS 18 LVC RTCM wiring (Mark DuMoulin @ WB2ERS)
-
Re: Garmin GPS 18 LVC RTCM wiring (Skyler F)
-
Re: Non-RTCM voter, where? (Joe Leikhim)
-
Re: Non-RTCM voter, where? (Jeff Ackerman)
Message: 1
Date: Tue, 29 Mar 2016 20:41:32 +0000
From: “Mark DuMoulin @ WB2ERS” wb2ers@metcom.com
To: “electricity440@gmail.com” electricity440@gmail.com
Cc: “app_rpt-users@ohnosec.org” app_rpt-users@ohnosec.org, Tim
Sawyer <tisawyer@gmail.com>
Subject: Re: [App_rpt-users] Garmin GPS 18 LVC RTCM wiring
Message-ID: cde8aeb0edee46229c60c0f689178b3f@MAIL2.metcom.com
Content-Type: text/plain; charset=“us-ascii”
Skyler,
Good afternoon.
I saw your post regarding the RTCM-GPS-18x LVC question.
I would use the app_rpt site but cannot seem to get registered.
I have tried many times to get registered on the app_rpt users but it always comes back no such user!!!
Here’s the question:
I have two of the same RTCM and Garmin GPS 18x LVC.
I have been completely unable to get either to work.
I followed your wiring:
RTCM GPS 18x LVC
6 GRX ← Rx Data 6 Green
7 GPPS ← Pulse Output 1 Yellow
8 GND Ground 3 Black
8 GND Ground 5 Black
13 +5V -->Vin 2 Red
14 GTX → TX Data 4 White
No joy. Did you get yours working?
Anything you can share?
I have a feeling that the Garmin’s have been reprogrammed to something other than factory default 4800 in the PGRMF.
Tnx,
Mark DuMoulin Sr.
WB2ERS
800-410-3130
-------------- next part --------------
An HTML attachment was scrubbed…
URL: <http://ohnosec.org/pipermail/app_rpt-users/attachments/20160329/5e20b25e/attachment-0001.html>
Message: 2
Date: Tue, 29 Mar 2016 17:42:07 -0600
From: Skyler F electricity440@gmail.com
To: “Mark DuMoulin @ WB2ERS” wb2ers@metcom.com
Cc: “app_rpt-users@ohnosec.org” app_rpt-users@ohnosec.org, Tim
Sawyer <tisawyer@gmail.com>
Subject: Re: [App_rpt-users] Garmin GPS 18 LVC RTCM wiring
Message-ID:
<CAJNyT09MbYM3szsG8LbQYf2DvHhYJptZd6Qqdqct3fF9=oTRsg@mail.gmail.com>
Content-Type: text/plain; charset=“utf-8”
Hi Mark,
Mine seems to be working, and the wiring is as above.
Here is my RTCM GPS configuration
8 - GPS Data Protocol (0=NMEA, 1=TSIP) (0)
9 - GPS Serial Polarity (0=Non-Inverted, 1=Inverted) (0)
10 - GPS PPS Polarity (0=Non-Inverted, 1=Inverted, 2=NONE) (1)
11 - GPS Baud Rate (4800)
Does it match?
This is what I get on boot:
GPS signal acquired, number of satellites in view = 11
03/29/2016 23:37:20.300 Warning: GPS Data time period elapsed
03/29/2016 23:37:20.300 Warning: GPS PPS Signal time period elapsed
03/29/2016 23:38:06.980 Time now syncronized to GPS
73,
Skyler
On Tue, Mar 29, 2016 at 2:41 PM, Mark DuMoulin @ WB2ERS wb2ers@metcom.com wrote:
Skyler,
Good afternoon.
I saw your post regarding the RTCM-GPS-18x LVC question.
I would use the app_rpt site but cannot seem to get registered.
I have tried many times to get registered on the app_rpt users but it
always comes back no such user!!!
Here?s the question:
I have two of the same RTCM and Garmin GPS 18x LVC.
I have been completely unable to get either to work.
I followed your wiring:
RTCM GPS 18x LVC
6 GRX ← Rx Data 6 Green
7 GPPS ← Pulse Output 1 Yellow
8 GND Ground 3 Black
8 GND Ground 5 Black
13 +5V -->Vin 2 Red
14 GTX → TX Data 4 White
No joy. Did you get yours working?
Anything you can share?
I have a feeling that the Garmin?s have been reprogrammed to something
other than factory default 4800 in the PGRMF.
Tnx,
Mark DuMoulin Sr.
WB2ERS
800-410-3130
–
Skyler Fennell
KD?WHB
-------------- next part --------------
An HTML attachment was scrubbed…
URL: <http://ohnosec.org/pipermail/app_rpt-users/attachments/20160329/ec3cc1c8/attachment-0001.html>
Message: 3
Date: Wed, 30 Mar 2016 11:09:10 -0400
From: Joe Leikhim rhyolite@leikhim.com
To: app_rpt-users@ohnosec.org, info@meshnetworks.co.nz
Subject: Re: [App_rpt-users] Non-RTCM voter, where?
Message-ID: 56FBEC16.9040203@leikhim.com
Content-Type: text/plain; charset=windows-1252; format=flowed
Here are some products to start with;
There is the Raven M4x
http://www.ravencomm.com/documents/products_doc3_23.pdf
Raytheon JPS SNV-12 (Though the future of this product is up in the air,
it was the defacto standard. Uses 600 ohm VF circuits, IP connectivity
needs to be overlaid)
http://www.simulcastsolutions.com/userfiles/file/appnotes/vSnv12App.pdf
Motorola Spectra Tac (Obsolete Now Motorola has pretty much abandoned
analog FM technology. Uses 600 ohm VF circuits,)
http://www.repeater-builder.com/motorola/spectra-tac/spectratac-index.html
The above voters all use some method of signal/noise voting. The JPS
SNV-12 and the Raven M4X use DSP to make decision, while the Spectra Tac
was pretty much an analog noise measurement vs a status tone/audio AGC
level. The SpectraTac does not support non-Motorola receivers unless you
know the “secret sauce” which I am privy to.
This site has some practical examples of projects that are simulcast,
but by design incorporate the SNV-12 voters.
Are you looking for some more in depth RF design aspects of receiver
voting? I can help perhaps.
Joe
On 3/8/2016 5:20 AM, Steve Wright wrote:
On 05/03/16 06:00, mike@midnighteng.com wrote:
FYI There are RTCM /voter systems for app_rpt if you want to do it
right.
Is there an example voting-RX project somewhere I can read about?
Non-RTCM please. I know about the RTCM and I’m looking at alternatives.
Many thanks,
Steve
App_rpt-users mailing list
To unsubscribe from this list please visit
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll
down to the bottom of the page. Enter your email address and press the
“Unsubscribe or edit options button”
You do not need a password to unsubscribe, you can do it via email
confirmation. If you have trouble unsubscribing, please send a message
to the list detailing the problem.
–
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
407-982-0446
Message: 4
Date: Wed, 30 Mar 2016 08:25:58 -0700
From: Jeff Ackerman kg6uyz@gmail.com
To: Joe Leikhim rhyolite@leikhim.com
Cc: info@meshnetworks.co.nz, app_rpt mailing list
<app_rpt-users@ohnosec.org>
Subject: Re: [App_rpt-users] Non-RTCM voter, where?
Message-ID:
<CAKmcLtKcH_jzYPHGTp3AO115W8XEdgwrMrfdqd=zB0NOQ-aAqA@mail.gmail.com>
Content-Type: text/plain; charset=“utf-8”
If you looking for the alternative IP voting of the varuious app_rpt
flavors you can try XIPAR: http://www.xelatec.com/xipar/simplevoter
It wont be as seamless of voting as a RTCM, but its much simpler, doesnt
require anything more then PC’s, the IP backhaul and usb radio interfaces
with radios capable of giving discriminator audio.
Conventional hardware voting comparators could work but require the
backhaul, which in most commercial applications is 4 wire e&m voice
circuits using either tone signaling or e&m signaling. (This method of
voting is done outside of allstar/app_rpt.)
On Wed, Mar 30, 2016 at 8:09 AM, Joe Leikhim rhyolite@leikhim.com wrote:
Here are some products to start with;
There is the Raven M4x
Raytheon JPS SNV-12 (Though the future of this product is up in the air,
it was the defacto standard. Uses 600 ohm VF circuits, IP connectivity
needs to be overlaid)
http://www.simulcastsolutions.com/userfiles/file/appnotes/vSnv12App.pdf
Motorola Spectra Tac (Obsolete Now Motorola has pretty much abandoned
analog FM technology. Uses 600 ohm VF circuits,)
http://www.repeater-builder.com/motorola/spectra-tac/spectratac-index.html
The above voters all use some method of signal/noise voting. The JPS
SNV-12 and the Raven M4X use DSP to make decision, while the Spectra Tac
was pretty much an analog noise measurement vs a status tone/audio AGC
level. The SpectraTac does not support non-Motorola receivers unless you
know the “secret sauce” which I am privy to.
This site has some practical examples of projects that are simulcast, but
by design incorporate the SNV-12 voters.
Are you looking for some more in depth RF design aspects of receiver
voting? I can help perhaps.
Joe
On 3/8/2016 5:20 AM, Steve Wright wrote:
On 05/03/16 06:00, mike@midnighteng.com wrote:
FYI There are RTCM /voter systems for app_rpt if you want to do it right.
Is there an example voting-RX project somewhere I can read about?
Non-RTCM please. I know about the RTCM and I’m looking at alternatives.
Many thanks,
Steve
App_rpt-users mailing list
To unsubscribe from this list please visit
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll
down to the bottom of the page. Enter your email address and press the
“Unsubscribe or edit options button”
You do not need a password to unsubscribe, you can do it via email
confirmation. If you have trouble unsubscribing, please send a message to
the list detailing the problem.
–
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
407-982-0446
App_rpt-users mailing list
To unsubscribe from this list please visit
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down
to the bottom of the page. Enter your email address and press the
“Unsubscribe or edit options button”
You do not need a password to unsubscribe, you can do it via email
confirmation. If you have trouble unsubscribing, please send a message to
the list detailing the problem.
–
Jeff Ackerman
-------------- next part --------------
An HTML attachment was scrubbed…
URL: <http://ohnosec.org/pipermail/app_rpt-users/attachments/20160330/25cc28f2/attachment.html>
App_rpt-users mailing list
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
End of App_rpt-users Digest, Vol 85, Issue 52