Motorola Talkabout T5720 (7 Channels) 2-Way Radio Logo

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Question about Motorola Talkabout T5720 (7 Channels) 2-Way Radio

2 Answers

Send data over T5720 ?

I use a T5720. How can I use it to send data over it ? thanks Arshad

Posted by Anonymous on

  • Anonymous Jun 19, 2007

    thanks Neto.

    Can you recomend a solution for GPS tracking over VHF radio for about 10 vehicles covering 100 Kms ? The vehicles already have Motorola GM338 (25W VHF mobile radio).




2 Answers


Create your own protocol .. try to see how wide is the channel and then try some solution like sending pulses in morse code whith location .. or translate nmea protocol into pulses .. the thing is u will need some kind of device made speciaally for your need's .. I don't known if it's possible to send data whith an old modem 33 kbps or less .. it depend's on the bandwith of the channel but that's an other option ...but it'll hace to be half duplex and the talk/no talk action will be hard yto implement .... a verry simple option is ..... a code at the beggining .. s eries of pulses separated in thime so that the machiine knowns the truck is triing to communicate .. and then send each numbres of the lat and long. in pulses ...a specific time .. it's slow and noise sensitive but it's something ...

Posted on Jun 21, 2007



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  • 123 Answers

Those radios were not designed to transmit data, and has no any port for it.

Posted on Jun 18, 2007


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We have two talkabout t5720, both set on same channel. One seems to send, while the other does not. we haven't used them before-is there a simple solution? Thanks

Yes. The solution should be simple. The radios are possibly not set to the same interference eliminator code and/or Qt filter setting. Here is a link to the user guide:
You will find the programming instructions begin on page 21.

The frequency, code and Qt filter must be set identically on both radios. For simple basic operation set the code and Qt filter to zero (off).

Best regards.

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I have a TLKR-T3 and a T5720 radios. can they communicate? Thanks

No, they have no frequencies in common. The TLKR-T3 uses the PMR446 frequencies common in Europe. The T5720 uses FRS freqeuncies common in the USA.

Normal RS -232 cable

5 4 3 2 1
9 8 7 6

1 - Not Used
2 - Transmit Data (TD)
3 - Receive Data (RD)
4 - Request to Send (RTS)
5 - Clear to Send (CTS)
6 - Grounded
7 - Signal Ground (Gnd)
8 - Data Carrier Detect (DCD)
9 - Data Terminal Ready (DTR)

RPL & TPL tones used in T-5720

The T5720 user manual does not list the TPL codes possible in the radio. However, they are the standard list, with zero being "open squelch" (no code). Here is a link to a Motorola manual which has a list of the PL codes in order on page 43.

On the T5720, another item to what for is the Qt noise filter. Be certain to set it to zero unless using the T5720 with others of the same model. It can also block transmissions. Here is a link to a user manual for the T5720

Comms problem between motorola t5522 and t5720

Are you sure both radios has the same Squelch Code and QT?

Pin out for t5720

the Plug is a 2.5 mmm the tip is mic, middle speaker, the end is gnd.

How to open the T5720?

for 5720 - open two screws below battery compartment. and two screws are under the front false faceplate. Pull out the face plate (from the top) and unscrew the two screws above the display. walla you have it dismanteled ! Arshad
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