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GMRS Group Compatibility

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  • AJ0ML
    Greetings, I rummaged around the group s posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope
    Message 1 of 9 , Aug 7, 2011
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      Greetings,

      I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.

      I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?

      Are there incompatibility issues between brands of GMRS transceivers?
      Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.
    • paul k. sanchez
      Start off with the same channel but no group, then verify in the owner guides for each that the group code is actually the same. paul k. sanchez, cfii-mei
      Message 2 of 9 , Aug 7, 2011
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        Start off with the same channel but no group, then verify in the owner guides for each that the group code is actually the same.

        paul k. sanchez, cfii-mei
        561-693-7374 office
        305-389-1742 wireless
        10643 shore drive
        boca raton, florida 33428-5645
        sanchezpaulk@...

        http://www.paulksanchez.com
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        http://gallery.me.com/sanchezpaulk#gallery
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        On 07 Aug 2011, at 17:07, AJ0ML wrote:

        > Greetings,
        >
        > I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.
        >
        > I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?
        >
        > Are there incompatibility issues between brands of GMRS transceivers?
        > Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.
        >
        >



        [Non-text portions of this message have been removed]
      • Steve
        There shouldn t be,A radio programmed to the same freq. and pl should communicate with each other. From: AJ0ML To: GMRS@yahoogroups.com
        Message 3 of 9 , Aug 7, 2011
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          There shouldn't be,A radio programmed to the same freq. and pl should communicate with each other.


          From: AJ0ML <pcitizen@...>
          To: GMRS@yahoogroups.com
          Sent: Sunday, August 7, 2011 2:07 PM
          Subject: [GMRS] GMRS Group Compatibility


           
          Greetings,

          I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.

          I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?

          Are there incompatibility issues between brands of GMRS transceivers?
          Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.




          [Non-text portions of this message have been removed]
        • jjp5576@aol.com
          Hi, I didn t see your original question but will suggest a couple of things. If you want to have all 4 radios talk to each other on simplex, make sure they all
          Message 4 of 9 , Aug 7, 2011
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            Hi, I didn't see your original question but will suggest a couple of things. If you want to have all 4 radios talk to each other on simplex, make sure they all have the same PL. some radios use a number for the PL frequency and different manufacturers us different numbers. Try using all 4 radios without PL's and see what happens. Jeff.







            -----Original Message-----
            From: AJ0ML <pcitizen@...>
            To: GMRS <GMRS@yahoogroups.com>
            Sent: Sun, Aug 7, 2011 10:19 am
            Subject: [GMRS] GMRS Group Compatibility





            Greetings,

            I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.

            I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?

            Are there incompatibility issues between brands of GMRS transceivers?
            Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.









            [Non-text portions of this message have been removed]
          • David A. Behar
            Hi friends, Just to clarify... The most commonly used group code system used on GMRS is what is generically knows as Continuous Tone-Coded Squelch System
            Message 5 of 9 , Aug 7, 2011
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              Hi friends,

              Just to clarify...

              The most commonly used "group code" system used on GMRS is what is generically knows as Continuous Tone-Coded Squelch System (CTCSS). It's also known by trade names including "PL" / "Private Line" (Motorola), "CG" / "Channel Guard" (General Electric), "Quiet Channel" (old RCA), "C. Tone" (Icom), "QT" / "Quiet Talk" (Kenwood), "TG" / "ToneGuard" (Johnson), etc.

              The most common names used are probably "PL" and just "tone squelch".

              If the actual continuous tone frequencies match, radios should be compatible regardless of manufacturer. E.g., two radios using a 100.0 Hz continuous tone will work compatibly. But assignment of "tone numbers" is sometimes incompatible between manufacturers. E.g., tone "14" might represent 107.2 Hz with one manufacturer, but 103.5 Hz with another manufacturer.

              The documentation for a radio should include programming instructions which include a table of tone frequencies. Some transceivers and scanning receivers can be configures to report the subaudible tone being received on a channel.

              A nice overview of CTCSS is at http://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System.

              David

              [Non-text portions of this message have been removed]
            • michaelhcox@gmail.com
              GMRS channel 462.600 is the same on all radios. However, is the channel 3 or channel 17? Further, Channel 3, Sub channel 01, is that PL channel 67.0? Not
              Message 6 of 9 , Aug 7, 2011
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                GMRS channel 462.600 is the same on all radios. However, is the channel 3 or channel 17? Further, Channel 3, Sub channel 01, is that PL channel 67.0? Not all radios have all PL and DPL frequencies. If you look at the manual for both radios, there should be a chart that lists what the frequency for the various sub channels are.
                Thanks,

                Michael H. Cox
                KF7EEC / WQJT342
                A+, Network+, Security+, MCP, MCDST, CNE, CIW Web Design Specialist, CCENT
                Member of ARES, RACES, ERC, CERT, Skywarn, and MARA

                -----Original Message-----
                From: "AJ0ML" <pcitizen@...>
                Sender: GMRS@yahoogroups.com
                Date: Sun, 07 Aug 2011 21:07:30
                To: <GMRS@yahoogroups.com>
                Reply-To: GMRS@yahoogroups.com
                Subject: [GMRS] GMRS Group Compatibility

                Greetings,

                I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.

                I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?

                Are there incompatibility issues between brands of GMRS transceivers?
                Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.




                [Non-text portions of this message have been removed]
              • Mark
                Guys, What I think he is referring to as group code is some sort of data stream that the radios send to each other which opens squelch independent of PL/DPL.
                Message 7 of 9 , Aug 7, 2011
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                  Guys,

                  What I think he is referring to as "group code" is some sort of data stream
                  that the radios send to each other which opens squelch independent of
                  PL/DPL.

                  I have heard this on my GMRS channel - NOT on my repeater, but on the output
                  channel (simplex). It sounds like a series of musical tones. I believe
                  these are proprietary to the individual radio, so he would NOT be able to
                  make one brand communicate with the other if using such a code scheme.

                  Mark - N9WYS / WQIV271

                  -----Original Message-----
                  From: GMRS@yahoogroups.com [mailto:GMRS@yahoogroups.com] On Behalf Of David
                  A. Behar
                  Sent: Sunday, August 07, 2011 4:42 PM
                  To: GMRS@yahoogroups.com
                  Subject: Re: [GMRS] GMRS Group Compatibility

                  Hi friends,

                  Just to clarify...

                  The most commonly used "group code" system used on GMRS is what is
                  generically knows as Continuous Tone-Coded Squelch System (CTCSS). It's
                  also known by trade names including "PL" / "Private Line" (Motorola), "CG" /
                  "Channel Guard" (General Electric), "Quiet Channel" (old RCA), "C. Tone"
                  (Icom), "QT" / "Quiet Talk" (Kenwood), "TG" / "ToneGuard" (Johnson), etc.

                  The most common names used are probably "PL" and just "tone squelch".

                  If the actual continuous tone frequencies match, radios should be compatible
                  regardless of manufacturer. E.g., two radios using a 100.0 Hz continuous
                  tone will work compatibly. But assignment of "tone numbers" is sometimes
                  incompatible between manufacturers. E.g., tone "14" might represent 107.2
                  Hz with one manufacturer, but 103.5 Hz with another manufacturer.

                  The documentation for a radio should include programming instructions which
                  include a table of tone frequencies. Some transceivers and scanning
                  receivers can be configures to report the subaudible tone being received on
                  a channel.

                  A nice overview of CTCSS is at
                  http://en.wikipedia.org/wiki/Continuous_Tone-Coded_Squelch_System.

                  David

                  [Non-text portions of this message have been removed]



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                • Moe
                  Hello you could look at the manuals and compair the frequencies I know my Midland gtx1050 useses a different channel to talk to my Motorola .you could key up
                  Message 8 of 9 , Aug 7, 2011
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                    Hello you could look at the manuals and compair the frequencies I know my Midland gtx1050 useses a different channel to talk to my Motorola .you could key up on one ans scan the receive on the other good luck Moe

                    -----Original Message-----
                    From: AJ0ML <pcitizen@...>
                    Sent: Sunday, August 07, 2011 4:07 PM
                    To: GMRS@yahoogroups.com
                    Subject: [GMRS] GMRS Group Compatibility


                    Greetings,

                    I rummaged around the group's posts to see if someone talked about my question. I came up with very little that addresses my concern. I hope someone here can help.

                    I have a four GMRS radios - two pairs. One set is Midland GXT950 and the other set is Uniden GMR-3689. I can establish communications using Group settings only on the same brands of radios. I cannot get the Midland and Uniden to communication when they are set to the same channel and group mode though. Here's my questions?

                    Are there incompatibility issues between brands of GMRS transceivers?
                    Does anyone have any advice besides reading the manual? I've done that and set both sets of radios the same way.


                    Reply to sender | Reply to group |

                    [The entire original message is not included]

                    [Non-text portions of this message have been removed]
                  • David A. Behar
                    Hi there, In addition to the CTCSS codes, both radios accommodate the DCS (Digital-Codes Squelch) system. (See http://en.wikipedia.org/wiki/Squelch#DCS.) Re
                    Message 9 of 9 , Aug 8, 2011
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                      Hi there,

                      In addition to the CTCSS codes, both radios accommodate the DCS (Digital-Codes Squelch) system. (See http://en.wikipedia.org/wiki/Squelch#DCS.)

                      Re the Midland radio, (what I think is) the (relevant) owner's manual is at http://www.midlandradio.com/Resource_/OwnerManual/165/GXT900%20Owner's%20Manual(Rev%20B).pdf. This radio accommodates 38 CTCSS codes and 104 DCS (Digital-Coded Squelch) codes.

                      Re the Uniden radio, the owner's manual is at http://www.uniden.com/content/ebiz/uniden/resources/ownersmanuals/GMR3689-2CKom.pdf. This radio also accommodated 38 CTCSS codes and 104 DCS codes.

                      Both radios use the same code numbers -- "1" through "38" for the same CTCSS codes. (I checked.)

                      It also looks like the radios accommodate the same 104 DCS codes -- however, they have a different numbering scheme. The Midland radio numbers the DCS codes "1" through "104", while the Uniden radio numbers the DCS codes "39" through 142.

                      The tone squelch systems of both radios should be 100% compatible, as long as the user selects the same system (CTCSS or DCS) and the same code.

                      David


                      [Non-text portions of this message have been removed]
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