Humminbird Model DC 25 R. The mic key is stuck in the send position. I disconnected the mic wire but the radio still does not recieve. Does the mic have to be connected to recieve signal? If so where can Iget a mic?
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the tx/rx liight is green when your radio is recieving signals and turns red when you are sending signals. the ANT light is red when your SWR is too high (over 3)
1. turn the knob labeled swr cal all the way counter clockwise
2. set the rf swr cal switch to the CAL position
3 key up the mic and hold it while you rotate the swr cal knob until the needle reaches the swr cal postition
4. set the swr cal rf switch to the swr position
5. key up the mic while on chanel one (record the the number)
6. switch to chanel 40 key up the mic (record the number)
if the number on chanel one is lower than the number on chanel 40 then your antenna is too long.
1 Shield 2 White 3 Red 4 Black if the radio keys up as soon as you turn it on reverse 3 and 4 I am not familiar with that mic.But the way I actually should have given you the wiring order is as follows:1Shield 2 Modulation 3 and 4 key up I hope this helps.
Pin 1 is shield, thats the bare wire wrapped around the mic audio wire pin 2 ic mic audio [usually white) pin 3 is transmit or push to talk usually red pin 4 is recieve or speaker complete usually black
Hello Darren, Yes it sounds like the mic is wired bass ackwards,,! A cobra 25 mic wiring is
PIN #1- Shield or ground wire
PIN#2- Audio or Transmit modulation
PIN #3- Transmit or Dead Key
PIN #4- Receive Audio.
When your keying the mic, the RX wires are being connected to make the RX work,,,
*** Let me know how you get along with it. Either buy a new mic wired for your radio or you or someone comfortable with soldering needs to resolder the correct wires back on the mic plug,,,Like I said, let me know and have a great day,, Mechanic is back quiet!
First off check to see if your mic gain is turned all the way down. Second; if you have a power mic is the battery dead ir the volume of the mic turned down. If these check ok, look for a loose or broken audio wire in your microphone, and the connector (both ends can break). I have seen the wires break as far back as 4 inches from the mic head and the connector depending on how the user held the microphone, or pulled against the wire. if the problem is not found to be any of the above I suggest you take the radio to a qualified technician for repair.
It is not typical but neither is there a problem with the radio.
Transmit Power output is loosely dependent on the:
1. Frequency or channel you are transmitting. Normally, Marine Band VHF are calibrated for max (25 in your radio) at Ch16 or 156.800Mhz;
2. If the SWR of the antenna is not a flat 1.0, power tends to go down;
3. After some time, the TX side of the radio needs to be re-calibrated;
4. Power Supply - some radios will push max output only when powered with 13.8 and tends to go down when used with 12 volts.
Hope this be of some help/idea. Post back should you need additional information.
Good luck and kind regards.