Passive antenna systems
What is a passive antenna?
It consists of two (or three) aerials connected with a low-loss co-axial cable.
This passive repeater is positioned at a point where the reception is optimum from the extreme ends.
Antennas do not amplify the signal; but only relay it to cover a blind spot.
Position can be determined using the three-person reception test.
The maximum cable length we recommend is 50m for UHF and 100m for VHF communication.
What is a three-person reception test?
This is done by placing two people with hand portables at extreme ends of the location while a third person acts as a repeater.
The third person tries to position himself in the middle at the most appropriate location where reception is good from both ends.
Once this position is determined you can consider placing the passive antennas at that point.
Part numbers (please ask your Dealer or Entel Account Manager for prices):
CAT2004 – VHF Folded Dipole Antenna complete with N sockets
CAT2006 – UHF Folded Dipole Antenna complete with N sockets
LD-103 – Westflex 103 Cable
PlugNWF – N Type Plug for Westflex 103 Cable
NT3WFMF – 3 way splitter
SOCKETNWF – Socket for 3-way splitter
Diagram of passive antenna systems:
Specifications:
MECHANICAL SPECIFICATION | ||
Connection | RG213/U Coaxial Cable c/w N socket | |
Construction | Aluminium Alloy Tube 6063T6 to BS 1474 | |
Fasteners | Stainless Steel Grade A2-70 to BS6105 | |
Saddle Clamp | Diecast Zinc Alloy | |
Protection | Direct Grounded | |
Insulator | Epoxy Resin Encapsulant | |
Mounting Clamp | Crossover Clamp (not included) | |
Down Lead | 3 m | |
Elements | 12.7 mm X 1.6 mm Wall | |
Support Boom | 31.7 mm X 2.6 mm Wall | |
Weight | 80 MHz 160 MHz 450 MHz | 2.6 kg 2.3 kg 1.9 kg |
Boom Length | 80 MHz 160 MHz 450 MHz | 1.3 m 1.0 m 1.0 m |
Wind Loading @ 45 m/s | 80 MHz 160 MHz 450 MHz | 134N |
ELECTRICAL SPECIFICATION | |
Frequency Range | 68 - 470 MHz |
Impedance | 50 Ohms |
Bandwidth | 22% |
Polarisation | Vertical |
Typical Gain | 1.5 dBd |
Front To Back Ratio | 4 dB |
H Plane Beamwidth | 200 |
E Plane Beamwidth | 85 |
VSWR | <1.5:1 |
Maximum Power | 150W |