Question about Radio Communications
When transmitting the modulation is distorted when the mic is close to mouth but is understandable when held about 12 inches from the mouth.This is reportd by another boater about 15 miles away at frequency 2.802 mz and 4.146 mz.
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Posted on Jan 02, 2017
Great now check TR42 AM POWER then check TR41 AM POWER REG. They are on right side twards rear of board with front of radio faceing you part side up. A good place to start!
Posted on Jul 07, 2007
It looks like you had some loose connections in that CB. you may want to also check for other cold solder joints throughout the units and touch them up with some solder. Might I suggest you use a desoldering tool and then just add new solder to the connection.
Posted on Sep 05, 2007
Depending on the type of power supply, radio frequency (RF) energy from the transmitter may be 'fooling" it into thinking that you're overloading it. Check to see if there's any discernible dimming of the meter lamp when this problem occurs, if so, the supply is the culprit.
Otherwise, its probable that the final amplifier transistors are overheating, either they are 'leaky' or not properly attached to the heat sink.
Posted on Sep 26, 2008
SOURCE: pro 640e
How are you testing the audio out?
Are you using another radio?
If so, are you REALLY sure the other radio is ok?
If the other radio is ok, how do you know the mic is ok? have you tested it with another radio?
If the mic is ok, id have a look at the mic socket to check that all the pins are still there. Then open the radio up and check the socket is still connected to the main board.
Let me know how you get on..
Posted on Feb 02, 2009
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