I have a Cobra Marine Mr F75 that is stuck on channel 4 and will not change channels on the radio or by using the handheld reciever??

https://www.manualslib.com/manual/468424/Cobra-Marine-Mr-F75-D.html

Try contacting Cobra directly Support Cobra Electronics Corporation

How did you solve your problem?

restore.

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.

Regards, Tony

Before changing out the radio try the radio on a ANTENNA RADIO TESTER or try it on a different antenna. Good luck.

http://www.cobra.com/downloads/manuals/MRF75_manual-Eng.pdf.

Howdy from South Texas and Merry christmas.

Here is your link and enjoy the Holidays.

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

Patrick Patterson

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.

Hi - You can download the manual from the link underlined in blue below:

75 WX ST

Other info here.



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