If a Bolt 3000 system is configured to use 20 MHz channels instead of the default 40 MHz channels, it can allow more units to operate in the same location.
The use of 20 MHz channels can also allow operation of the units in locations with heavy electromagnetic interference / radio-frequency interference (EMI / RFI).
However, there are a few trade-offs to using 20 MHz channels compared to the standard 40 MHz channel width.
The following are not supported when 20 MHz channels are in use:
- Audio transmission
- Interlaced video formats (1080i50 / 1080i59.94 / 1080i60)
- Progressive Segmented Frame video formats (e.g. 1080PsF 23.98, 1080PsF24, 1080PsF25)
- 1080p50 and 1080p60 video formats
If 20 MHz channels are enabled and an unsupported interlaced or PsF video format is attempted, the video will have poor quality.
If 20 MHz channels are enable and a 1080p50 or 1080p60 video format is attempted, no video will be transmitted at all.
Progressive video formats (e.g. 1080p23.98 , 1080p24, 1080p25, 1080p30) are supported with 20 MHz channels and do not have any impact to video quality.