The EFS 9221 is an active, symmetrical biconical antenna with a wide frequency range of more than 5 decades and a remarkable flat frequency response. In contrast to the frequently used unsymmetrical vertical monopole or rod antennas the EFS 9221 allows precise fieldstrength measurements, thanks to a very high common mode rejection. Because of its small dimensions and a built in rechargeable NiMH battery the EFS 9221 is a perfect choice for portable applications. The sensitivity can be improved by approx. 11 dB using the optional BBUK 9139 M4 biconical elements.
| Frequency Range: | 9 kHz – 1 GHz |
| Nominal Impedance: | 50 Ω |
| Antenna Factor: | typ. 27-37 dB/m |
| Deviation from Omnidirectional Pattern: | typ. < 1.5 dB |
| Frequency Flatness: | typ. < +/- 1.5 dB (50 kHz -1000 MHz) |
| Fielstrength measuring range: | ~ ≤ 135 dBµV/m (~ ≤ 6 V/m) |
| VSWR: | typ. < 1.2 (f < 300 MHz) typ. < 1.6 (f < 1 GHz) |
| Dimensions: | 610 x 144 x 50 |
| Mounting | 22 mm |
| Weight: | 780 g |
| Connector: | N female |
| Option: Elements for High Sensitivity | BBUK 9139 M4 |
| Option: Automatic Charger | ACS 110 |
