Coax Systems:

1. When using a coax feed as an input to a 'Main' Z-Band video distribution unit, the RF signal level needs to be a FLAT ~ 20 dBmV for Digital Channels.
   
2. FLAT usually refers to the signal levels being constant across the active RF frequencies without any slope. For example, if you have an RF signal with active channels across full spectrum from 54MHz to 860MHz, then its level at Ch02 could be at 20.3dBmV, Ch50 could be at 20.5dBmV, Ch90 could be at 20.8dBmV and Ch134 at 20.5dBmV. Regardless of how the RF channels are generated and combined their levels needs to be relatively constant when going into a Z-Band video distribution hub.
   
3. This RF signal requirement is ~25dBmV for Analog channels
   

Fiber Systems:

1. When using a fiber input for a Z-Band video distribution unit, make sure that it is single mode fiber with a SC/APC connector.
   
2. The optimal input level for the fiber input going into a Z-Band video distribution unit is ~ -2dBm with an acceptable input range spanning from -2.0dBm to -3.5dBm.
   

Fiber Transmitter:

1. The fiber transmitters also need a flat ~20dBmV RF signal fed as its input for Digital Channels.
   
2. If you have less than 8 QAM channels then this input requirement needs to be increased to a flat 23-25dBmV.
   
3. If you have Analog channels as RF Input source to a fiber transmitter then the signal level needs to be a flat ~25dBmV.