The Sirio CX-4-68 is a 4M base antenna, this one is designed to work between 68 and 73MHz.
Key Features:
Base station antenna, Mono-band
Low-gain, Omnidirectional
Protection from static discharges DC-Ground
Made of aluminium alloy 6063 T-832
Electronic Data:
Type: 3/4λ coaxial J-pole
Frequency range: tunable 68...73 MHz
Impedance: 50Ω
Radiation (H-plane): 360° omnidirectional
Radiation (E-plane): beamwidth @ -3 dB = 60°
Radiation angle: 3°
Polarization: linear vertical
Gain: 2dBd - 4.15 dBi
Bandwidth @ SWR: ≤1.5 ≥ 1.7 MHz @ 68 MHz
SWR. @ res. freq.: ≤ 1.2
Max. Power (CW) @ 30°C: 500 Watts
Grounding protection: All metal parts are DC-grounded, the inner conductor shows a DC short
Connector: UHF-female
Mechanical Data:
Materials: Aluminium, Brass, Stainless Steel, Nylon
Wind load / resistance: 97 N @ 150 Km/h / 150 Km/h
Wind surface: 0.08 m²
Height (approx.): from 2700 to 3360 mm
Weight (approx.): 1900 gr
Mounting mast: Ø 35-42 mm
- MPN:
- No
- Sirio 4 meter antenna
- Hi there these antennas work really well, I think they have 1 o2 db gain over a dipole, the biggest problem with them is water ingress, you have to really go overboard with waterproofing them, you will need a lot of self amalgamating tape and some liquid glue, araldite and plastic tale...there are few U tube clips on it but one by Ray G4 something in Sussex...good luck and keep the water out...there is a good article from a PE station on it, worth looking at...from Fred g4vvq
