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Does The 4-Pin Microphone Connector Carry Audio Output?

Discussion in 'Microphones, Speakers & Audio Processing' started by KC3IJL, May 24, 2018.

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  1. KC3IJL

    KC3IJL Ham Member QRZ Page

    I'm looking to purchase the SLCAB4R cable from signalink to allow my signalink to talk with my old Midland XTR radio.

    I have a weird feeling that this radio does not output an audio feed on this cable. I may be mistaken, could someone confirm or deny that for me before I purchase this cable?

  2. W9GB

    W9GB Ham Member QRZ Page

    The Midland Radio you have is a Land Mobile / Business Band version.
    Signlink references are for the 13-510 2-meter FM model sold in 1976 (anateur radio market).
    As a Penn State EE ... Build it yourself ... not that hard. Consider it a EE LAB Assignment.

    RF Connection sells MP4F (female) and MP4M (male) connectors at $1.50 each
    Choose correct one.

    4-pin Microphone (MP4x) has NO Audio Output.
    Audio Ouput on REAR Panel (SPEAKER or ACCessory connector)
    4-pin Asian (Foster) microphone connector (MP4x)
    Originally mfg. in Japan (1970s), now mfg. in China (they call it DC power connector)

    Microphone (Audio Input) - 2 wires
    Push-To-Talk (PTT) - 2 wires
    The Midland Syn-Tech VHF


    Repeater Builder TIP
    Cross Reference
    Last edited: May 24, 2018
  3. KC3IJL

    KC3IJL Ham Member QRZ Page

    See that's what I thought. My meter wasn't giving me any signal on any pins other than 5v for the PTT. So I assumed that there was no audio output on that connector. The rear connector definitely has audio output though. According to the manual of my radio, the rear connector is used to interface the external speaker, mic hook, jumper for the internal speaker, and power. It also shows pinouts for each.

    I was just looking for a simpler way to interface my radio to my signalink because I can't hit any gateways with my HT.

    Thanks for the info!

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