Question about Cobra Marine Vhf Radio

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The fuse for my cobra marine vhf radio blows as soon as I turn it on? I think that I may have crossed the + and - wires before turning it on and realized it after it belew the fuse and then I swapped them back, could this of caused an internal short in the radio that can be fixed or is it trash.

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 157 Answers

SOURCE: Transmits but does not Receive

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.

Posted on Oct 28, 2008

vrc_tech
  • 109 Answers

SOURCE: Need an operating manual for a Cobra MR F75 VHF Marine Radio

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

Posted on Dec 16, 2008

  • 31 Answers

SOURCE: Need an operating manual for a Cobra MR F75 VHF Marine Radio

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

Posted on Apr 13, 2009

  • 35 Answers

SOURCE: cobra marine band radio will not transmit more

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

Posted on Jan 29, 2011

AJIN G
  • 6694 Answers

SOURCE: I have a Cobra 18

Hi,
Connection that you have made are correct. One thing you hve to check is the Black wire is properly connected to the ground or not. If you have a multimeter set the meter to Ohms then check the Ohms between the Red and black wire of the Cobra 18 WX ST II. If its bellow 100 Ohms there is some short inside the Cobra 18 WX ST II. May be the protection Zenar diode inside the system become faulty. If there is no such short then you have to change the 2A fuse to higher one Like 4A or 5A. And the connect the system.

When you connect the multimeter if there is any short its will show the reading instandly. If there is no short then the multimeter will show random values.
OK

Posted on Sep 24, 2011

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Need an operating manual for a Cobra MR F75 VHF Marine Radio


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

Dec 15, 2008 | Cobra MRF55 2-Way Radio

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