Antenna Accessories page
Accessory antennas, amplifiers & cables at competitive prices! (see below and also Prices & ordering page)
Antenna Criterion
1) Reception at this frequency (1090MHz) is fundamentally line of sight.
2) Major influence on reception is height of antenna.
3) Limits to reception are obstacles in path of reception (eg buildings, hills) and curvature of earth.
4) In-line amplifiers are most effective nearest antenna to amplify reception signal at its best.
5) Keep antenna co-ax cable length to a minimum.
6) Use of magnetic base antenna without a suitable metallic 'ground plane' will give a lesser performance.
Comparative Antenna Performance
The results of our tests shown below were taken over a period of time and averaged to give an indication of relative performances of different antenna configurations.
The site used was ideal, at an elevated location (East of Brisbane) and close to the visible ocean.
Better performance figures at other locations are unlikely to be achieved.
The magnetic base antenna (with 3dB whip) used was that supplied with the basic SBS-1 kit.
| Antenna | Antenna position | Accessory Components | Range - Nautical Miles | |
| 1 | Magnetic base with 3dB whip | Near sbs-1 | none | 100 |
| 2 | Magnetic base with 3dB whip | About 3 metre above sbs-1 | 6m RG58 extension cable (SEC6) | 150 |
| 3 | Magnetic base with 3dB whip, with in-line amplifier | Near sbs-1 | In-line amplifier kit (ILAK) | 128 |
| 4 | Magnetic base with 3dB whip, on ground plane mounting plate with in-line amplifier | About 3+ metre above sbs-1 (say in ceiling space) | 12m RG58 cable with 1m RG58 fly lead (SEC12) + in-line amplifier (ILAK) at antenna + mounting plate (EAMBK) | 181 |
| 5 | Magnetic base with 3dB whip, on ground plane mounting plate | External, about 8 metre above sbs-1 | 12m RG58 cable (SEC12) + mounting plate (EAMBK) | 144 |
| 6 | Magnetic base with 3dB whip, on ground plane mounting plate | External, about 8 metre above sbs-1 | 15m low-loss/RG213 cable (LLEC15)+ mounting plate (EAMBK) | 160 |
| 7 | Magnetic base with 3dB whip, on ground plane mounting plate with in-line amplifier | External, about 8 metre above sbs-1 | 12m RG58 cable (SEC12) + in-line amplifier (ILAK) at mast head + mounting plate (EAMBK) | 207 |
| 8 | Magnetic base with 3dB whip, on ground plane mounting plate with in-line amplifier | External, about 8 metre above sbs-1 | 15m low-loss/RG213 cable (LLEC15) + in-line amplifier (ILAK) at mast head + mounting plate (EAMBK) | 210 |
For prices, see Prices & ordering page
Antenna, with amplifier, Schematic
In-line antenna amplifier kit - illustration
(Kit does not include extension cable)
In-line antenna amplifier specification
The 18dB amplifier is a fully screened remote powered device which will work in a voltage range of 12-18V DC. Maximum output of 105dB
μV at 35dB IMR. • 950 - 2050Mhz • Passes both DC and 22KHz
Magnetic Base Antenna (MD1103a or MD1105a)
Includes 1 metre RG174 co-ax with BNC plug
30mm base
An accessory antenna for use with extension cable, with or without amplifier
Can use on mounting bracket/plate, or steel surface, as external mount antenna
External Antenna Mounting Bracket Kit (EAMBK)
Suits magnetic base antenna
Does not include upright pole or antenna
Includes U-bolt to mount to pipe (eg TV antenna mount pole) up to 27.5mm diameter
Can be screwed to vertical or horizontal surface
Dimensions (based on ¼ wave) to optimise ground plane effect for antenna
Shows accessory magnetic base antenna (MD1105a or similar) on external antenna mounting bracket kit (EAMBK), mounted on post as external antenna.