MR F57 - Radio COBRA - Free user manual and instructions
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| Product Type | Citizen Band (CB) Radio |
| Brand | Cobra |
| Model | MR F57 |
| Frequency Range | 26.965 – 27.405 MHz (40 CB channels) |
| Dimensions (W x H x D) | Approx. 7.0 x 2.4 x 1.2 inches (18 x 6 x 3 cm) |
| Weight | Approx. 0.9 lbs (400 g) |
| Power Source | 12V DC (cigarette lighter adapter) or 8 AA batteries (not included) |
| Transmit Power | 4 watts (AM) |
| Modulation | AM (Amplitude Modulation) |
| Controls | Volume, Squelch, Channel selector, On/Off, Push-to-Talk button |
| Display | Backlit LCD channel display |
| Indicators | TX (transmit) LED, Signal strength/RF meter |
| Built-in Speaker | Yes, 2-inch dynamic speaker |
| External Speaker Jack | 3.5mm mono jack |
| Microphone | Built-in electret; external mic available via jack |
| Antenna | Removable flexible whip antenna with standard BNC connector |
| Memory Channels | None (manual tuning only) |
| Weather Alert | NOAA weather channels (WX) with alert function |
| Battery Life (AA) | Approx. 20 hours (typical use) |
| Housing Material | Durable plastic with rubber grips |
| Operating Temperature | -20°C to +50°C (-4°F to 122°F) |
| Cleaning | Wipe with a soft, dry cloth; avoid liquids |
| Safety Certified | FCC Part 95 approved |
| Included Accessories | Antenna, 12V adapter, belt clip, wrist strap |
| Replacement Parts | Contact Cobra customer service for antenna, battery door, or belt clip |
Frequently Asked Questions - MR F57 COBRA
What is the Cobra MR F57 used for?
The Cobra MR F57 is a Citizen Band (CB) radio designed for short-distance two-way communication, often used in trucks, off-road vehicles, or for outdoor activities.
How do I turn on the radio?
Rotate the Volume knob clockwise until you hear a click. The display will light up. Adjust volume to desired level.
How many channels does the MR F57 have?
It has 40 CB channels (Channels 1-40) on AM mode. It also includes NOAA weather channels (WX) with alert function.
Can I use the radio without batteries?
Yes, you can power it using the included 12V DC cigarette lighter adapter. If using batteries, insert 8 AA batteries (not included).
How do I adjust the squelch?
Turn the Squelch knob counterclockwise until background noise is heard, then slowly clockwise until the noise stops. This reduces static on weak signals.
What is the range of the MR F57?
Typical range is 1-4 miles depending on terrain, antenna, and atmospheric conditions. With a good antenna, range can extend up to 10 miles.
How do I listen to weather channels?
Press the WX/Alert button (if available) or cycle to the weather band. The radio will scan NOAA weather channels. Press again to exit.
Why is my transmission not being heard?
Ensure the antenna is properly connected and fully extended. Check that you are on a valid CB channel and the channel is not in use. Press and hold the Push-to-Talk (PTT) button while speaking clearly into the microphone.
How do I clean and maintain the radio?
Wipe the exterior with a soft, dry cloth. Do not use water or cleaning solvents. Store in a cool, dry place. Check antenna connections periodically.
Where can I find replacement parts or service?
Contact Cobra customer service at 1-800-262-7226 or visit www.cobra.com. Common replacement parts include antennas, belt clips, and battery doors.
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USER MANUAL MR F57 COBRA
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Product information
Brand : COBRA
Model : MR F57
Category : Radio