Overview
The Cobra 21 is a compact mobile CB radio designed for basic communication needs. It is part of Cobra’s entry-level lineup, offering essential CB functionality in a small form factor suitable for vehicles with limited space.
Technical Specifications
| Item | Details |
|---|---|
| Model | Cobra 21 |
| Manufacturer | Cobra Electronics |
| Radio Type | Mobile CB transceiver |
| Channels | 40 CB channels (26.965–27.405 MHz) |
| Modes | AM |
| Power Output | 4 watts (FCC limit) |
| Power Supply | 13.8 VDC (vehicle power) |
| Controls | Volume, squelch, channel selector |
| Display | LED channel display |
| Audio Output | Built-in speaker |
| Microphone | Handheld with push-to-talk (PTT) |
| Antenna Connector | SO-239 |
Physical Description
The Cobra 21 features a compact metal chassis with a simple front panel layout. Controls typically include:
- Rotary knobs for volume and squelch
- Channel selector (rotary or push-button depending on revision)
- LED channel display
- Front-mounted microphone connector
The unit is designed for dash or under-dash mounting in vehicles and includes a built-in speaker for audio output.
History
The Cobra 21 was introduced as an entry-level CB radio aimed at users needing straightforward communication without advanced features such as single sideband (SSB) or extensive controls.
It reflects Cobra’s long-standing approach of offering reliable, easy-to-use radios for trucking, off-road, and general consumer use. While not as feature-rich as higher-end models like the Cobra 29 or 148 GTL, the Cobra 21 has remained a practical choice for basic CB operation.
References
- https://www.cobra.com
- https://www.rigpix.com/cbfreeband/cobra21.htm
- https://www.cbtricks.com/radios/cobra/cobra_21/index.htm
- Secret CB Volume 19 (1984)
Overview
The Cobra 21 is a compact 23-channel mobile AM CB transceiver manufactured by Dynascan Corporation.
Technical Specifications
| Attribute | Details |
|---|---|
| Manufacturer | COBRA |
| Model | 21 |
| Product Category | Citizens Band (CB) Transceiver |
| Years Manufactured | 1974–1976 |
| Channels | 23 Channels |
| Modulation | AM |
Physical Description
Built into a compact metal chassis with front rotary controls for squelch, volume, channel selection, and an analog signal meter.
History
Marketed in automotive and electronics trade ads from 1974 to 1976 for $119.95 as an entry-level mobile transceiver prior to the 40-channel expansion.
Mic Wiring
Pin 1 – Shield / Ground
Pin 1 – Switch Line
Pin 2 – Mic Audio
Pin 3 – RX
Pin 4 – TX / PTT