The MPT1327 Option Board (Part 2)



The MPT1327 Option Board is configured by means of the MPT OB CPS and (host radio) MOTOTRBO CPS. In order to operate, the radio needs to be provisioned with 16 analogue channels; in the first zone with Option Board ticked. The frequencies are irrelevant as this will be controlled by the Option Board. This is described in some detail in this presentation.

Diagnostics in Part 3....

11 comments:

  1. Dear Wayne,
    we already have a trunk system MPT1327 with five channels and analoge handheld radios GP680Ex,
    now we are planning to upgrade to digital handheld radios with MPT1327 option board, the problem that there are some points like behind buildings, behind a small hills that has a very weak receive signal, is the digital radios has a high receive sensitivity level than analogue? other thing, can i extend the coverage to cover all weak points by using like broadband booster or anything else?
    Thanks in advance.

    ReplyDelete
    Replies
    1. You may find that the MOTOTRBO radios perform better in digital mode but in analogue mode there will be no difference.
      It may be possible to extend the coverage by means of a Passive Repeater or similar but there are many factors which you need to consider and which I cannot go into without in-depth knowledge of your system. It would be best if you make contact with a Motorola Engineer who can advise you: click on Links>>>Where to get support.

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  2. Dear Wayne,
    we already have a trunk system MPT1327 with five channels and analoge handheld radios GP680Ex,
    now we are planning to upgrade to digital handheld radios with MPT1327 option board, the problem that there are some points like behind buildings, behind a small hills that has a very weak receive signal, is the digital radios has a high receive sensitivity level than analogue? other thing, can i extend the coverage to cover all weak points by using like broadband booster or anything else?
    Thanks in advance.

    ReplyDelete
  3. what about the site survey program! Is it possible to use it with mototrbo hand-held ATEX including MPT1327 option board to get RSSI of my analogue trunk system?

    ReplyDelete
    Replies
    1. I assume you are referring to the MOTOTRBO Site Survey tool? This tool only works in digital mode so will be of no use to you at present.
      It is possible however to manually plot coverage using the RSSI readout and a GPS then recording this information on a map. The RSSI can be viewed on a display model by pressing 120#.

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  4. Thank you very much for your great information, and Merry Christmas for you and your family,
    I have some queries out of this topic about telemetry feature, i tried to connect many types of relay including solid state (3-30 volt) with our mobile DM3601 PIN OUT but the (5V) telemetry out unable to run my 5 volt relay, maybe because the current is very low (1 mA),
    I hope if you could advise me if there is any way to run my relay and thus run my circuit.
    thanks a lot,

    ReplyDelete
    Replies
    1. It sounds like you need something like this http://ebay.eu/1zteg2U

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  5. Your article series brought me on the idea, why not buy such a MPT GOB for my DP4801e?! I am using this radio for ham radio, but I still own an account for a local MPT1327 network, and some friends still are using this, so I ordered the board.

    Got it within two weeks, without any instructions, just in a little box with some accessories. So I found out on my own how to install it, how to fold the flex connector, and where to plug it in.

    Creating a zone with any carrier squelched 420 MHz / 12.5KHz channel, ticked option board and no signaling seemed enough to be prepared for MPT. Seems the GOB takes over control totally, and the settings barely matter.

    The software thing was quite easy, and although I have not programmed any MPT stuff for ten years, I immediately came along with it, the CPS looks really like 20 years ago :) So I was logged onto the network from scratch within 15 minutes. Just needed to search for my programming cable, as the bluetooth network connection I normally use was not recognized. Due to the last 2.7 update the cable however was still in closer reach.

    Works like expected, the sensitive SDR radio beats all GP1200 / GP1280 stuff by far, performance is as never experienced before with MPT. A modern TRX really is fun!

    Just one little issue, the squelch closes quite early and takes some time to open again, I must look into all parameters if I can find something related. This behavior is in MPT only, conventional channels do not show this.

    Thank your very much for your article series that brought me back to MPT1327 after years of absence!

    ReplyDelete
    Replies
    1. Update: The RSSILx levels also influence the squelch, adjusting them helped. Now it is almost perfect :)

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    2. Thanks, lots of useful feedback:-)

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