Description of Site 1:
- 1 SMC2582WB
- 1 directional grid antenna (24DBi)
- 1 outdoor amp (YDI Iwatt)
- 4 feet of LMR-400 cable
- The SMC is next to the antenna
- 150 feet of LAN Cat 5 cable to the ADSL Cisco SOHO router
- Same SMC radio
- Splitter 1 to 2, to an omni antenna of 14 DBi & the 24DBi antenna
- Same 1 watt amp
- 150 feet of LMR-400 cable
- 20 feet of LAN cable to my switch.
Your splitter causes insertion loss and divides available power between two antennas. Furthermore, Site 1 has just 4 feet of LMR-400 cable, while Site 2 has 150 feet, causing much greater attenuation. The power radiated by Site 2's directional grid antenna should therefore be significantly less than the power radiated by Site 1's antenna. Site 2's omni antenna might be useful to local stations, but probably not to Site 1's receiver located miles away.
Use a reference guide like the CWNA Study Guide and the actual insertion loss and attenuation ratings associated with your splitter, connectors, cables, antennas and amps to calculate your Equivalent Isotropically Radiated Power (EIRP). Then you can consider changing your Site 2 setup (for example, adding an amp) to increase the power aimed at Site 1.
This was first published in August 2004