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Intercom Problem with New Radio
On May 29, 6:30 am, Steve - KDMW wrote:
... They indicated that they did an exact wire-for-wire swap with the COM 120. The intercom volume drops as soon as you turn the SL40 on. You don't have to be transmitting or receiving for the problem to occur. Steve When the SL40 is powered up, the feedback around its audio output amplifier becomes active, creating a very low- output impedance. If this is paralled with something it shouldn't be, then this is what caused the audio level to drop. This leads me to believe that the headphone COM120 output was NOT wired to the isolated summing input on the audio switching panel as it should have been. AFIK, Narco products have an internal resistor in series with the headphone output, which might prevent the volume drop even as wired. A half-assed fix would be to insert a series 100 Ohm resistor in the wire coming from the SL40 headphone output. A better fix would be to trace out where that wire actually goes... |
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