The antenna tower in Ramme, closely to the lighthouse "Bovbjerg Fyr" and Lemvig city at the western coast of Denmark, is used for AIS, VOR, XXX and mobile cellular phone antennas. The tower is placed at a high point and "shoots" radio waves a long way out into the North Sea.
AIS (universal Automatic Identification System) is used as a kind of radio "Lighthouse" - used for real time positioning, speed, course, length, width, draft, ship name, call sign, status, type, destination and much more information of many larger ships around the world. There will be much more information about the AIS system at the Shipplotter home page. Shipplotter is a PC-program used to decode the AIS signals received via a receiver at 161.975 or 162.025 MHz.
VOR (VHF Omni directional Range) is a radio based navigation system used for the aircraft traffic since the fifties. The VOR system is based on a number of radio "lighthouses" on shore, transmitting special radio signals. Inside every lager aircrafts there is placed a receiver for receiving the VOR transmitters radio signal. The received VOR signal varies, on the direction, in relation to the VOR transmitter. This variation information is decoded by the aircrafts receiver too and presented for the pilot. The VOR radio signals are transmitted in the 108 - 118 MHz range. Ramme VOR is transmitting at 111.850 MHz with DME "55y" and identification "RAM".
For the technically minded, a VOR transmitter transmits two signals: one is constant in all directions, whilst the other one cycles round and round. As they go in and out of phase, the receiver on the aircraft can see the result as a series of radial lines coming out of the station, each one degree apart from its "neighbors".
XXX (based on HF)... I will be back with more information when further inspection is made...!
Mobile cellular phone (GSM) - well known around the world and need no further explanation...
The top of the main antenna tower in Ramme - closely to Bovbjerg Fyr and Lemvig city. The two large antenna systems nearest the top is used for the VOR system. The four white boxes, between the VOR antennas, is stacked antennas for the mobile cellular phone system. Two of the antennas are directed to "shoot" mobile cellular phone signals over the North Sea. The antenna at the bottom is used for AIS system.
The top middle of the antenna tower.
The center middle of the antenna tower. More mobile phone antennas.
The lower middle of the antenna tower.
The bottom of the antenna tower.
The three containers at the bottom of the antenna tower - one for the mobile phone base station, one for the AIS/VOR transceiver and one for the XXX transceiver.
The complete antenna tower from the west side.
The complete tower from the southern side.
The base and grounding of the antenna tower.
Some of the AIS and VOR antenna feeders. The left four feeders is for the VOR system and the two at the right i for the AIS system.
Groundings of the mobile phone antenna feeders - just before entering the base station container.
Grounding the mobile phone antenna feeders at the bottom of the antenna tower.
More grounding at the antenna tower base.
Grounding the antenna feeders for AIS/VOR at the bottom of the antenna tower.
The antenna feeders for AIS VOR - goes through tubes between the antenna tower and the AIS/VOR transceiver container.
The container end of the tubes between the antenna tower and the AIS/VOR transceiver container. Notice the groundings at alle antenna feeders - just before entering the AIS/VOR container.
This is the XXX transceiver. It is working at the HF bands. The vertical wire is a part of the XXX transceivers antenna wire system. The North Sea is in the background.
More of the XXX the XXX transceivers antenna system. The tower in the background is supporting the western end of the horizontal part of the antenna wire system.
The connection point between the vertical and the horizontal part of the antenna wire system.
The main antenna tower is supporting the eastern end of the horizontal part of the antenna wire system. The four wires with the isolators is the antenna tower supporting wires.
One of the three anchor blocks. It is used to keep the "earth end", of the antenna tower supporting wires, in place. Notice the isolators - the same procedure as used at the "tower end".