SC20 Antennas
The SC20 product range is available with a wide range of antennas. These are selected depending on the operational frequency band, the carrying position of the hand-portable and even the level of RF coverage of the network.
The extended compressed helical and the quarter wave whip antenna have similar performance characteristics, both offer a higher gain and improves coverage when compared to the compressed helical and can be used when network coverage is restricted.
The SC20 antennas are the same as used with the STP series of hand-portables.
Antennas are colour coded to indicate frequency band.
Nominal gain figures shown in the table are measured in free space at resonance. These figures will degrade when used close to the body.
General characteristics
Nominal impedance: 50Ω
VSWR at resonance ≤1.5:1
Connector type: SMA male
Operational temperature range: -20ºC to +55ºC (useable range -30ºC to +75ºC)
| Frequency | Colour code | Centre frequency | Frequency Band | Quarter wave whip >0dBi | Extended helical >- 1dBi |
|---|---|---|---|---|---|
| 136-150MHz | White | 143MHz | VHF | 300-02070 | |
| 149-165MHz | Green | 157MHz | VHF | 300-02071 | |
| 162-174MHz | Blue | 168MHz | VHF | 300-02072 | |
| 380-430MHz | Green | 405MHz | UHF | 300-00418 | 300-00417 |
380-400MHz | Blue | 390MHz | UHF | 300-00661 | |
407-473MHz | Yellow | 440MHz | UHF | 300-00499 | |
| 410-430MHz | White | 420MHz | UHF | 300-01031 | 300-00662 |
| 450-470MHz | Black | 460MHz | UHF | 300-01032 | 300-00663 |
| 806-870Mhz | Orange | 838MHz | UHF | 300-00498 |
Nominal gain figures shown in the table are measured in free space at resonance. These figures will degrade when used close to the body with the amount of degradation dependant on various factors.
