Hammer Fiber Optics Investments LTD. AIRTC31 用户手册
Check Signal to Noise Ratio (SNR)
Minimal values for functioning are:
- 24 dB of SNR for QAM64 modulation
Recommended values are:
- >30 dB of SNR
Caution
Values represent the minimum value for functioning of the devices and do not
contain any overhead of the SNR.
contain any overhead of the SNR.
Recommended spectrum analysers:
Promax
Deviser
3 Troubleshooting Check List for Initial Installation
If the signal is not found, be sure the antenna installation manual have been properly
followed. Check to:
followed. Check to:
o Make sure all cable connections are correct and each connection is tightened
properly
o Verify the direction of the aiming dish to the AIR base station
o Make sure there are no obstacles (trees, buildings, windows, corner or overhang of
your roof, your body..) - the signal does not pass leaves, branches.. etc.
o Make sure you have 12 VDC power supply on AIR transceiver (noise should be
visible on spectrum analyzer if you have power supply)
o RG 6 cable with solid copper center conductor is highly recommended because it
has much lower DC voltage drop compared to cable with a copper-coated, steel
center conductor.
center conductor.
o Check if are you using correct polarization on AIR transceiver