Benefits | Specifications | Download a pdf of this product (136k) 
 Installed at airports and en-route locations, the Doppler VOR Ground Beacon from Interscan is one of the primary navigational aids for a nation's airways system. It is a ground based, radio navigation aid, transmitting an omni-directional signal that enables an aircraft to determine its bearing relative to the location of the beacon.
Designed to exceed all ICAO requirements, it is the ideal complement to the LDB-102 DME, which has also been developed and manufactured by Interscan.
The VRB-52D DVOR Beacon comprises:
- an equipment rack, containing all the electronics required to generate the DVOR signals, together with a power supply/battery charger;
- an antenna distributor, to sequentially switch the signals from the rack around the ring of sideband antennas;
- an antenna system, comprising a ring of 48 sideband antennas and a central carrier antenna, mounted on a suitable ground plane.
Benefits of the VRB-52D include:
High reliability
- requires no cooling fans
- meets or exceeds all ICAO requirements
- high grade components and coated printed wiring boards
Can be used in difficult terrain
- suited for elevated counterpoise or ground mounted systems
- greatly improved VOR service from difficult sites
Proven performance
- over 500 navaid installations worldwide
- Interscan has developed capability in the installation and commissioning of navaid equipment in rugged and inhospitable locations
Low maintenance costs
- built-in test facilities
- Remote Maintenance Monitoring (RMM) available
Designed to meet diverse requirements
- 50 watts (standard) or optional 100 watts transmitter
- single or dual beacon: two identical equipment racks used in dual configuration
- optional float battery for true "no break" power sources
Specification SummaryThe following characteristics apply over the range of environmental conditions specified.
| R.F. Signal Output |
| Output power |
|
50 Watts or 100 Watts |
| Frequency Band |
|
108MHz to 118MHz |
| Carrier frequency stability |
|
±0.002% |
| |
|
|
| Radiation |
| Antenna system |
|
Alford loop antennas
1 carrier, 48 sideband |
| Polarisation |
|
Horizontal |
Bearing accuracy
(for all elevation angles
from zero to 40 degrees) |
|
Typically ±0.5° maximum error |
Bearing stability
|
|
Typically less than 0.1° |
| |
|
|
| Reference Phase Modulation (AM) |
| Frequency |
|
30Hz ±0.01% |
| Depth of modulation |
|
28% to 32% |
| |
|
|
| Variable Phase Modulation (FM on sub-carrier) |
| Sub-carrier frequency |
|
9960Hz+/-0.2% |
Mean modulation depth
by sub-carrier |
|
28-32% |
| Frequency of modulation |
|
30Hz ±0.01% |
| Deviation ratio |
|
16±1 |
| |
|
|
| Sub-carrier Modulation |
AM on sub-carrier
(Measured at least 300m (1,000ft) from central antenna) |
|
Less than 40% |
| |
|
|
| Identification |
| Modulation tone |
|
1020Hz ± 50Hz |
| Modulation depth |
|
0-15% adjustable (nominal 10%) |
| Code |
|
International Morse
up to five letters |
| Keying speed |
|
7 words per minute (adjustable) |
| Repetition rate |
|
6 times per minute (adjustable) |
| DME keying |
|
interfacing provided
for co-located DME | |
|
| Voice Modulation |
| Frequency Range |
|
300Hz to 3000Hz |
| Modulation depth |
|
0 to 30% adjustable
(nominal 10%) |
| Noise due to signal communications |
|
Negligible |
| |
|
|
| Monitoring Alarm Limits |
| Bearing information |
|
Adjustable to ± 1.0° in 0.1° steps |
| 30Hz AM modulation depth |
|
15% below nominal, adjustable |
| 30Hz FM modulation depth |
|
15% below nominal, adjustable |
| Sub-carrier modulation depth |
|
15% below nominal, adjustable (30Hz AM, 30Hz FM and Sub-carrier may also be optionally set to alarm at 15% above nominal level) |
| Code failure |
|
Continuous or absent Tone |
| Failure of antennas |
|
Alarm for failure of two diametrically opposite antennas. Optional internal monitor for detection of single antenna failure. |
| Failure of monitor |
|
Self-check on bearing monitor |
| |
|
|
| Input Power, single DVOR |
| Primary Supply |
|
200 to 260V AC, 50/60Hz
600VA (50W rack)
900VA (100W rack) |
| Standby Supply |
|
22V to 28V DC
16A (50W rack)
22A (100W rack) |
| Input Power, dual DVOR |
|
The above consumption is required for each rack |
| |
|
|
| Environmental |
| Indoor equipment |
|
|
| Temperature |
|
-10°C to +60°C |
| Humidity |
|
95% (to 45°C)
50% (45°C to 60°C) |
| Outdoor equipment |
|
|
| Temperature |
|
-40°C to +70°C |
| Humidity |
|
100% |
| Wind speed |
|
160 km/h (100mph) | |
|
|
