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W/ Scholer-Johnson PassPort/LTR Option Board

    http://static1.1.sqspcdn.com/static/f/1281716/16754248/1329962014287/M1225+Mobile+Data+Document.pdf?token=9dXTDjx63sikrdbtc07Xogky6Os%3D
    M1225 RSS software and a Motorola RIB available to program the mobile radio. Also, ... order to get RX audio onto the Accessory connector for the data system to operate ... This will enable all RX audio from the discriminator of the radio to be available on …

Troubleshooting Motorola Radius M1225 | Electronics Forums

    https://www.electronicspoint.com/forums/threads/troubleshooting-motorola-radius-m1225.56828/
    distorted, the mobile audio won't pass through the repeater. That is why to your scanner and ear, the microphone audio sounds ok. The tone if good should be a sinewave of 500 to 750 Hz deviation, while if it is DPL, the code word should be fairly clean squareish wave with symmetry, flat topped with some visable shoulders (rise and fall ...

RPi2 Setup for Motorola Radius M1225 (that worked for me)

    http://zzoomworks.com/kh2fi/link2.html
    RPi2 Setup for Motorola Radius M1225 (that worked for me) Radio setup for this is coming soon 1. Download and install Win32DiskImager 2. Download and install SDFormater 4.0 3. download and indtall PuTTY 4. Download the latest RPi2 Allstar image from WA3DSP 5. Extract the RPi2 Image from the zip file 6.

Radius M1225 questions | RadioReference.com Forums

    https://forums.radioreference.com/threads/radius-m1225-questions.408734/
    Sparks, NV. Jun 16, 2020. #2. Off the top of my head, using Alpha-numeric names you get up to 20 channels. If you just use numbers you can go up to 22 ch. Something on that order. If the radio (s) are wired for IGNITION sense, then you have to connect switched +12v to one of the pins on the ACC plug.

Discriminator output - The RadioReference Wiki

    https://wiki.radioreference.com/index.php/Discriminator_output
    The Discriminator output from a scanner is the raw, unfiltered signal that a scanner produces before it is sent to the audio stage for output through the speaker -- also called the "baseband audio." This discriminator source is required for applications such as Trunker, T4Win, UniTrunker, and DSD.

Motorola 16 or 20 pin interface cables - HamGadgets

    http://www.hamgadgets.com/Motorola-repeater-interface-cables
    Motorola GM300, CDM750, CDM1250, CDM1550, M1225, Radius, (Maxtrac w/16 pin accy conn), SM120, SM50, M10, M120 On 20 pin radios, plug into CENTER 16 pins) Or any Motorola radios using 16 or 20 pin rear accy connector pins TX radio pins: Pin 2 Mic Hi (audio in) (WHITE to pin 11 IDOM4) Pin 3 PTT active low (GREEN to pin 3 IDOM4)

Homebrew/MMDVM - BrandMeister

    https://wiki.brandmeister.network/index.php/Homebrew/MMDVM
    From the radio, must set radio to use EXT. DATA SPEED = 9600 bps and use 6-pin Mini DIN cable as specified by RepeaterBuilder.org (pin 4 "PR9" is audio output before discriminator). From MMDVM set TXInvert=0 and RXInvert=1. Note that TX audio gain must be set quite high for DMR to operate properly.

Discriminator | RadioReference.com Forums

    https://forums.radioreference.com/threads/discriminator.52413/
    Every FM receiver (including your scanner) already has a discriminator. That is what detects the audio so you can hear voice. People "TAP" the discriminator output before the audio filtering to obtain the unfiltered data from the control channel and feed it into a computer where a program "reads" it and displays info.

Steve's FM Audio/Squelch board - stevedold

    http://stevedold.com/squelch/index.html
    This is an FM audio squelch board that connects to an FM receiver's discriminator/detector and provides all of the audio and logic signals needed to connect to a repeater controller. Space on the board is provided to install an optional CTCSS (PL) decoder.

CTCSS Encoder / Decoder Board - Masters Communications

    https://www.masterscommunications.com/products/squelch/ct30.html
    There are only three necessary connections for input; buffered discriminator audio, power, and ground. The logic outputs are not totem pole, however, separate active high and active low logic outputs are available. There are open collector outputs available from 2 holes marked A - B that are included on the circuit board.

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