Overview: The Cobra MR F77 is a powerful VHF marine radio featuring
built-in GPS, Emergency Alerts, NOAA Weather Radio with Weather Alerts, Instant Channel 16/9,
and Scanning. Its housed in a durable water resistant enclosure that has an
IPX8/JIS8 submersible rating and includes a a hand-held microphone on an
attached 48" coiled-cord. The radio includes mounting hardware to flush mount or
surface mount it to a console or dash.
Channel Selection: The MR F77 will receive and transmit VHF
signals on the channels you select. You can scan all channels, or Memory scan
channels saved as favorites. Tri-Watch mode gives you access to scan 3 channels
of most importance to you. Channels 16 and 9 will always be included with the
remaining channel being the one the radio was on when Tri-Watch mode was
entered. The dedicated front panel 16/9 button provides instant access to
priority channels 16 and 9 and a Squelch Control adjustment is also provided to
filter out weak signals and RF noise to let you hear the signals you want more
Rewind-Say-Again: The Rewind-Say-Again feature lets you
record and play back the last 20 seconds of an incoming audio transmission. When
a message is received that you can't understand due to excessive engine noise,
conversation, or music, simply pressing the front panel Rewind button will replay
a message up to 20 seconds in length.
Also, when receiving a distress message, the Rewind-Say-Again feature lets you
record call details, which may include coordinates, call signs, or registration
numbers that can be passed along to authorities.
Waterproof/Floating: The Cobra Marine MR F77 radio is
waterproof to IPX8/JIS8 standards, which means it can be submerged in 1.5 meters
of water for up to 30 minutes.
Noise-canceling Microphone: The radio features a
noise-canceling microphone that blocks background noise for clearer
GPS and DSC: The MR F77 includes built-in GPS which will
continuously display on the front panel LCD and will be included with any DSC
distress messages that are sent out. DSC (Digital Selective Calling) was developed as a much faster
way to send distress calls. It uses a stable signal with a
narrow bandwidth and has a longer range than analog signals. It's a
semi-automated system for establishing a radio call that was designed by the
International Maritime Organization (IMO) as an international standard for VHF,
MF, and HF calls and is part of the Global Maritime Distress and Safety System (GMDSS).
The DSC system allows you to instantly send a distress call by simply pressing
the Distress button on the front panel. This puts all other channels into
Standby mode and allows a pre-programmed message, such as "Sinking" or "Man
Overboard" to automatically be broadcast. It will include your GPS
coordinates, along with other important information, to the Coast Guard and other vessels within range of the
transmission. DSC also allows mariners to initiate and receive distress, urgent,
safety, position request, and group calls between vessels equipped with DSC
Dual Power: The MR F77 has two transmitting power levels, 1 watt and
25 watts. The 1 watt setting is the most common for short-range communication
and to avoid overpowering nearby stations with too strong a signal. The
high-power 25 watt mode is for long-range communications or when you don't get a
response signal using the 1 watt setting.
Channel Maps: Three sets of VHF Channel Maps have been established for
marine use in the United States, Canada, and the rest of the world
(International). The MR F77 includes all three Channel Maps for operation
anywhere in the world.
NOAA Weather Alerts: All of the National Weather Channels can be
accessed by the MR F77 at any time of day. With the radio's Weather Alert
feature, when NOAA broadcasts a Weather Alert Signal, the radio will output a
continuous audible tone and automatically switch to Weather Radio mode. This
alert will sound regardless of what channel the radio is operating on.
BURP: If the radio gets splashed with ocean spray or
subjected to extreme rain or weather, water can become trapped in the speaker
grille and muffle the audio. The Cobra-exclusive BURP feature expels water from
the speaker grill by emitting a loud tone for 5 seconds.
LCD: The MR F77's front panel features a large 2" x 1-1/4", orange
backlit, LCD that displays all the important information such as Channel Number,
Time, Date, GPS coordinates,
Channel Map, and more.
Connections: The rear panel of the radio includes 32" power and ground
wires with the power line requiring +10.0 V to +16 V to power the MR F77. Two
3-wire pigtails are provided, one for connecting an External Speaker (sold
separately) providing greater volume to hear messages and alerts than the
built-in speaker, and a PA (Public Address) output. This is used for an external
outdoor speaker for hailing other boats or giving instructions to line handlers.
A 40" cable terminating in a 2.5 mm socket is used for connecting an external
GPS unit (sold separately). The female socket allows the optional C.P.S. (Cobra
Positioning System) unit to be plugged directly in or, if using another brand of
GPS, a 7" pigtail with a male 2.5 mm jack on one end and bare wires on the other
is used for interfacing with the MR F77.
Antenna: The MR F77 requires a VHF antenna (not included) to send and
receive radio signals, and is compatible with most popular brands of VHF
antennas. A standard VHF coaxial antenna socket is provided on the rear panel.
Note: Attempting to transmit without an antenna attached WILL
damage the Cobra Marine VHF radio!
Mounting: The Cobra Marine radio includes both a Surface Mount kit and
a Flush Mount kit. The Surface Mount includes a U-bracket with tightening knobs
on either side to hold the radio in place. The U-bracket can be mounted either
under or above a flat surface with the tightening knobs allowing for tilt
adjustment. The Flush Mount kit includes two brackets that get screwed into
either side of the radio and then screwed into place inside a pre-cut opening in
a console or dash.
- Number of Channels: All U.S.A., Canadian, and International. 10
NOAA Weather Channels
- Channel Spacing: 25 kHz
- Modulation: 5 kHz maximum
- Input Voltage: 13.8 VDC
- Current Drain:
- Stand-by: 20 mA
- Receive: 200 mA
- Transmit: 5A @ High power, 1A at Low power
- Temperature Range: -4˚ F to 131˚ F
- Dimensions: Width - 6.188", Height -
3.0", Depth - 7.50"
- Weight: 2 lbs., 12.0 oz.
- Frequency Range: 156.050 to
- Receiver Type: Double Conversion
- 20 dB Quieting: 0.35 uV
- 12 dB Sinad: 0.30 uV
- AF Output: 2.5 watts @ 8Ω
- Frequency Range: 156.025 to
- RF Output Power: 1 and 25 watts
- Spurious Emissions: -60 dB High,
-55 dB Low
- Microphone Type: Electret
- Frequency Stability: +/- 10 ppm
- FM Hum and Noise: 40 dB