Just look up cobra 148 mike wiring diagrams and see which pin on the mike is audio then look where that pin hole goes in on the mike socket in the cb then solder your audiowire to that spot on the inside part of your mike socket
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break audio line. J2 input goes to mic pin J1output to radio.
(leave the shielded ground wires disconnected. on audio)
Power use a 1k ohm resistor from 12v dc on pwr switch.
Ground run the ground wire to board ground
test and set echo level.
this will work for any radio. if the echo needs 12v instead of 8v remove the 1k resistor and just use a 1n4001 diode on the power wires . some models require 12v some are 5-8volts.
This is a classic indication of a lost shield or ground connection in the mic circuitry. Double check these connections for good contact in the mic *and* the plug at the other end of the cable.
Check the grounding and SWR or "match"of the antenna system, too. A poor SWR (greater than 1.5:1 or 2.0:1) can cause the reflection of RF back to the radio. Modifications can increase sensitivity of the mic to this unwanted RF.
usally on most radios you will unplug the wire that comes from the number two mic plug. you will hook you sheid witch is the 2 little black wires from the echo board to number one mic plug. then the two wires will go to wire you unplug and the other one will go to number 2 mic plug.
Hello Jim. These radios do not work well with any power mic including the power echo mics because they have good modulation boards in them. But if you still want to try then check http://www.cbtricks.com/radios/cobra/200gtl_dx/index.htm