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Vhf radio cobra mr 75 will only transmit recieve at short range ie 1km even when on high power

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If there is power output, you need to use a watt meter and verify that your antenna is good. Depending on the antenna you can also check for a shorted or open connector or cable with an ohm meter.

Hope that helps...

Geno

Posted on Mar 05, 2008

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6ya6ya
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Hello,
You want to be able to transmit to the Coast Station on this frequency I assume. The Coast Guard monitors channel 16 at all times. This would be the primary channel in the United States. Your radio is VHF Marine Radio and has a built in frequency range of 156.050 MHz to 163.275 MHz. There is no need for a modification. This is a duplex frequency. What that means is you will transmit on one frequency and receive on another, while on channel 20. You will not need to transmit on 161.600. Turn your radio to channel 20. When you transmit, you will transmit on 157.000. And when the Port responds to you your radio will automatically receive their signal on 161.600. So if you are trying to figure out how to communicate with the port authorities then for that frequency turn your radio to channel 20 and you will be able to communicate with them.

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Your speaker has probably failed. I recommend taking your radio to a repair shop to replace the speaker. Should not be an expensive repair. I charge $75 for a speaker repair. They will also be able to go through the radio and check that everything else is ok. Feel free to contact me: kevin@sun-me.net if you need any help or want to send the radio to me for the repair.

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Howdy from South Texas and Merry christmas.

Here is your link and enjoy the Holidays.

http://cobra.com/downloads/manuals/MRF55_manual-Eng.pdf

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Check your microphone by swapping with another duplicate. If no differance, you will need a SWR meter (standing wave ratio) to find the culprit. It attaches in line of the coax and determinds power out and reflected power. The reading should be 25 watts foward and max of 1 reflected.

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This radios has a Reference Xtal, dropping the radio, could cause that the xtal goes out of frequency, this means tha the radios has a frequency error and the range of opearatin seems to be reduced or even null. With out knowlegement and equipmente, there is nothing that you can do.

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