Question about Motorola Spirit HP 2-Way Radio

1 Answer

Buzzing on radio

When we transmit to another radio you hear a buzzing along with the voice transmission

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  • david malkinski Nov 09, 2007

    Thanks for the possible solutions. About the frequency thing, how do I go about cking it out.

  • david malkinski Nov 09, 2007

    Again the buzzing sound is heard on the other persons radio recieving transmission, not on the radio sending transmissionh

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  • Master
  • 6,966 Answers

Hi,

Initial suspect would be:
1. Loose speaker grill cover or retaining clips of the speaker itself;
2. You are using CTCSS codes for personal communication and your code number is actually a buzz/tone where the frequency is sub-audible (still could be heard by some though barely). The said tone is super imposed on the voice signal which the radio uses to allow reception. The lowest is 1 which is 67Hz. Some Motorola uses A - 77Hz, B - 88.5, C - 97.4 with the highest at G - 136.5. Alternately, other Motorola models uses #s 1 - 38 corresponding to CTCSS frequencies from 67Hz to 250.3 Hz; or
3. Either of the radio is being charged while operating.

Hope this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Posted on Nov 08, 2007

  • Louie  Role
    Louie Role Nov 10, 2007

    Hi again,

    Copy that the buzzing is on the receiving unit which is normal if the CTCSS is enabled and is the cause of the buzz.

    To verify if the CTCSS is the buzz, set both radios to either Channel 5 or 10 and key PTT for a dead carrier (no voice). If the buzz is gone, then you have just confirmed that it's the CTCSS since either channel has no allocated sub-audible tone/frequency.

    Incidentally, CTCSS is also called: Coded squelch, Private-Line,
    PL, Quiet Call, Channel, Guard, etc.

    Should you be interested, the CTCSS frequency sub-audible tone programmed in a Motorola Motorola Spirit HP are:

    Channel CTSS (in Hz)
    1 67.0
    2 77.0
    3 88.5
    4 179.9
    5 none
    6 67.0
    7 82.5
    8 94.8
    9 179.9
    10 none

    Alternately:
    1. constant static maybe be due to the battery may be discharged; when using your radio around computers or electronic equipment, you may hear static or interference from these devices.
    2. a lowpitched beep when you turn on the radio indicates internal error and would require factory service.

    Cheers.

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