[App_rpt-users] Fwd: App_rpt-users Digest, Vol 85, Issue 52

James Cizek james.m.cizek at gmail.com
Wed Mar 30 11:42:54 EDT 2016


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 at ohnosec.org>
Date: Wed, Mar 30, 2016 at 9:26 AM
Subject: App_rpt-users Digest, Vol 85, Issue 52
To: app_rpt-users at ohnosec.org


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Today's Topics:

   1. Re: Garmin GPS 18 LVC RTCM wiring (Mark DuMoulin @ WB2ERS)
   2. Re: Garmin GPS 18 LVC RTCM wiring (Skyler F)
   3. Re: Non-RTCM voter, where? (Joe Leikhim)
   4. Re: Non-RTCM voter, where? (Jeff Ackerman)


----------------------------------------------------------------------

Message: 1
Date: Tue, 29 Mar 2016 20:41:32 +0000
From: "Mark DuMoulin @ WB2ERS" <wb2ers at metcom.com>
To: "electricity440 at gmail.com" <electricity440 at gmail.com>
Cc: "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>,    Tim
        Sawyer <tisawyer at gmail.com>
Subject: Re: [App_rpt-users] Garmin GPS 18 LVC RTCM wiring
Message-ID: <cde8aeb0edee46229c60c0f689178b3f at 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

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Message: 2
Date: Tue, 29 Mar 2016 17:42:07 -0600
From: Skyler F <electricity440 at gmail.com>
To: "Mark DuMoulin @ WB2ERS" <wb2ers at metcom.com>
Cc: "app_rpt-users at ohnosec.org" <app_rpt-users at ohnosec.org>,    Tim
        Sawyer <tisawyer at gmail.com>
Subject: Re: [App_rpt-users] Garmin GPS 18 LVC RTCM wiring
Message-ID:
        <CAJNyT09MbYM3szsG8LbQYf2DvHhYJptZd6Qqdqct3fF9=oTRsg at 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 at 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
amsatnet.info
KD?WHB
electricity440 at gmail.com
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Message: 3
Date: Wed, 30 Mar 2016 11:09:10 -0400
From: Joe Leikhim <rhyolite at leikhim.com>
To: app_rpt-users at ohnosec.org, info at meshnetworks.co.nz
Subject: Re: [App_rpt-users] Non-RTCM voter, where?
Message-ID: <56FBEC16.9040203 at 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.

www.simulcastsolutions.com

Are you looking for some more in depth RF design aspects of receiver
voting? I can help perhaps.

Joe

www.leikhim.com

On 3/8/2016 5:20 AM, Steve Wright wrote:
> On 05/03/16 06:00,  mike at 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
> App_rpt-users at ohnosec.org
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
>
> 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

JLeikhim at Leikhim.com

407-982-0446

WWW.LEIKHIM.COM



------------------------------

Message: 4
Date: Wed, 30 Mar 2016 08:25:58 -0700
From: Jeff Ackerman <kg6uyz at gmail.com>
To: Joe Leikhim <rhyolite at leikhim.com>
Cc: info at meshnetworks.co.nz, app_rpt mailing list
        <app_rpt-users at ohnosec.org>
Subject: Re: [App_rpt-users] Non-RTCM voter, where?
Message-ID:
        <CAKmcLtKcH_jzYPHGTp3AO115W8XEdgwrMrfdqd=zB0NOQ-aAqA at 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 at leikhim.com> wrote:

> 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.
>
> www.simulcastsolutions.com
>
> Are you looking for some more in depth RF design aspects of receiver
> voting? I can help perhaps.
>
> Joe
>
> www.leikhim.com
>
>
> On 3/8/2016 5:20 AM, Steve Wright wrote:
>
>> On 05/03/16 06:00,  mike at 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
>> App_rpt-users at ohnosec.org
>> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
>>
>> 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
>
> JLeikhim at Leikhim.com
>
> 407-982-0446
>
> WWW.LEIKHIM.COM
>
>
> _______________________________________________
> App_rpt-users mailing list
> App_rpt-users at ohnosec.org
> http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
>
> 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
kg6uyz at gmail.com
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