Kenwood TR-7600 mike

Discussion in 'General Technical Questions and Answers' started by KC5EZC, Jun 30, 2021.

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  1. KC5EZC

    KC5EZC Ham Member QRZ Page

    What was the kenwood number for the mike that came with the tr7600.
    Is there a sub other than the astatic 575?
    Thamks, John kc5ezc
  2. W1NB

    W1NB XML Subscriber QRZ Page

    Any dynamic microphone should work fine as long as it’s wired correctly.
    KS2G likes this.
  3. KS2G

    KS2G Premium Subscriber QRZ Page

  4. W0GSQ

    W0GSQ Ham Member QRZ Page

    MC-30S. It is a excellent noise canceling mic.
  5. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    It is, but wrong stock connector.

    The TR-7600, 7625 and a few others of that old vintage use a 5-pin mike connector, not 4-pin or 8-pin, etc.

    The connector is a bit unique, although available.
  6. WA2CWA

    WA2CWA Ham Member QRZ Page

    I believe the Kenwood MC-45 mike was supplied with the TR-7600 and 7625.

  7. W0GSQ

    W0GSQ Ham Member QRZ Page

    Still have mine attached to the 7625 I purchased in 1980, got tired of buying crystals for the 7200.
    Drove tens of thousands of miles in a non air conditioned truck using that radio and no one could tell I had both side windows open.
  8. W9GB

    W9GB Ham Member QRZ Page

    Kenwood TR-7600 VHF (2-meter) FM transceiver
    The Kenwood TR-7600 is a digitally synthesized high performance, 2 meter mobile transceiver.
    It features a four digit LED frequency display with memory.
    Transmit power may be set for 1 or 10 watts. Frequency range is 144 - 147.995 MHz.
    Dimensions: 6.3 x 2.375 x 9.2 inches ; Weight: 4 lbs.
    Requires 13.8 VDC at 3 Amps.

    The Microphone used a Dynamic element (500-600 ohms) and
    had a 5-pin circular “Foster” connector (the 5-pin is a rare CBC version)
    Pin 3 is POWERED during Transmit operation.

    5-pin circular mic connector

    Vetco Electronics
    Kenwood MC-30S (MC-35S) Microphone used a 4-pin Circular (Foster) connector.
    MANUAL SHEET Instruction Manual.pdf
    Last edited: Jul 1, 2021
    KB0MNM and W0GSQ like this.
  9. WA2CWA

    WA2CWA Ham Member QRZ Page

    I forgot to mention that the MC-45 that I mentioned in an earlier post does come with a 5 pin connector.
    At least that should answer the original poster's first question: "What was the kenwood number for the mike that came with the tr7600"
  10. W9GB

    W9GB Ham Member QRZ Page

    Kenwood MC-45 Touch Tone microphone
    Touch Tone encoder IC, MK5087N, is similar to Texas Instrument's TCM5087 part (circa 1982).

    When acquiring USED Kenwood MC-45 microphones, CHECK the two (2) electrolytic capacitors (4.7uF) inside the microphone. After 40+ years, they are likely leaking or faulty.

    Kenwood Service Bulletin #35 (May 1979)
    The MC-45 Touch Tone Microphone is supplied with a 5-pin circular connector installed on it.
    This allows the microphone to be used with the TR-7600 and TR-7625 2M FM transceivers.

    The Kenwood MC-45 may also be used with the TR-7400 FM transceiver, IF the MC-45 microphone plug is changed to the 4-pin type used on the "TR-7400" (E07-0403-05) and the microphone socket on the TR-7400A is modified to supply power to the microphone (for Touch Tone functionality)

    The 5-pin microphone connector is changed so the PTT ground and microphone ground wires are connected together on the 4 pin plug.
    This means the wires on pins 4 and 5 of the five-pin plug
    will be connected to pin 3 of the new four-pin plug.
    The other PTT lead (on pin 2) would go to pin 2.
    The microphone hot lead goes from pin 1 to pin 1.
    The power lead (on pin. 3) would be connected to pin 4 of the newly installed four-pin plug.
    Last edited: Jul 2, 2021
    KB0MNM and W0GSQ like this.

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