Marine Radio Basics

MR F55 EU / MR F75 EU DSC Call Log
The MR F55 EU and the MR F75 EU employ a call log for DSC messaging. If your radio receives a DSC call, it will be saved into the log. In addition, an icon ...
Connecting an External Antenna to Your Handheld Marine Radio
The following applies to the models listed below. Read further for other models.  MR HH300 MR HH325 MR HH400 MR HH415 MR HH425 The antenna con...
Range of Cobra Marine Radios
It is difficult to provide a number, because range will be affected by the following factors:   Transmit power: Higher transmit power gets better range. ...
Marine Radio SWR
What is SWR? SWR is short for STANDING WAVE RATIO. It is a measure of how well the antenna is performing. Most problems with the antenna or antenna cabl...
Maritime Mobile Service Identity
The MMSI number identifies you and your vessel. You must register to get an MMSI number. There is no charge. You cannot send any DSC messages until you prog...
Connecting a Non-Cobra GPS Device to the MR F55 / MR F75
This can be tricky because different manufacturers use different wiring schemes. Therefore, we can only provide general recommendations.   Your Cobra radi...
RF Exposure
Exposure to RF energy is always a concern. Concerns have been voiced about these and more:   High tension wires from the electric company X-rays at the ...