318 | | A GPS antenna assembly is provided, and connected to the IDU, to provide a stable and precise timing source to the base station. The antenna assembly is connected to the IDU using a 50-ohm coax, that carries the receivedsignal to the IDU, and power to the antenna assembly. [[BR]] |
319 | | |
320 | | The GPS antenna assembly can be mounted in any outdoor location where it can "see" the sky, but we will assume that it is mounted in the same location as the WiMAX antenna. |
321 | | |
322 | | |
323 | | The suggested GPS antenna assembly is the [http://www.antenna.com/apg_products.cgi?id_num=11092 PCTel GPS-TMG-SPS-40NCB] timing reference antenna. It provides: |
| 318 | A GPS antenna assembly is provided, and connected to the IDU, to provide a stable and precise timing source to the base station. [[BR]] |
| 319 | |
| 320 | The antenna assembly is connected to the NEC IDU using a 50-ohm coax, that carries the received signal to the IDU, and power to the antenna assembly. [[BR]] |
| 321 | |
| 322 | Connectors:[[BR]] |
| 323 | * NEC IDU: GPS Antenna Terminal (GPS ANT): BNC connector[[BR]] |
| 324 | * GPS antenna: N, female (one - bottom fed)[[BR]] |
| 325 | |
| 326 | |
| 327 | The GPS antenna assembly can be mounted in any outdoor location where it can "see" the sky, but we will assume that it is mounted in the same location as the WiMAX antenna.[[BR]] |
| 328 | |
| 329 | |
| 330 | The suggested GPS antenna assembly is the [http://www.antenna.com/apg_products.cgi?id_num=11092 PCTel GPS-TMG-SPS-40NCB] timing reference antenna. It provides:[[BR]] |
325 | | * heavy duty mounting clamp |
326 | | * amplifier with 40 dB of gain |
327 | | |
328 | | The amplifier with 40 dB of gain compensates for loss in the 50-ohm coax cable run from the GPS antenna assembly at outside site, to the IDU at the indoor site. |
329 | | |
330 | | The suggested 50-ohm coax cable is [http://www.l-com.com/multimedia/diagrams/D_RG58C-_.JPG RG58C/U], which has a loss at the GPS frequency of approxiamately 1000MHz of 40 dB for 200 ft of cable. |
| 332 | * heavy duty mounting clamp[[BR]] |
| 333 | * amplifier with 40 dB of gain[[BR]] |
| 334 | |
| 335 | The amplifier with 40 dB of gain compensates for loss in the 50-ohm coax cable run from the GPS antenna assembly at outside site, to the IDU at the indoor site.[[BR]] |
| 336 | |
| 337 | The suggested 50-ohm coax cable is [http://www.l-com.com/multimedia/diagrams/D_RG58C-_.JPG RG58C/U], which has a loss at the GPS frequency of approxiamately 1000MHz of 40 dB for 200 ft of cable.[[BR]] |