Audio options available:

• Mono L, Mono R, Mono L+R
• A2 Dual Mono (L, R), A2 Stereo
• NICAM Dual Mono (L, R), NICAM Stereo

Knowledge about A2 and NICAM 728 audio:

NICAM 728: 

• It is transmission of two-channel digital sound with terrestrial television systems B, G, H, l, K1 and L

A2 Stereo: 

• Known as "two-channel sound", it is an analog television sound transmission system used in Germany, Austria, Australia, Switzerland, Netherlands and some other countries that use or used PAL-B or PAL-G. .It relies on two separate FM carriers.

32 (or 64) standard PAL or NTSC or SECAM TV programs output via 32 (or 64) non-adjacent or adjacent carriers output within 400MHz

Features 

• Support to convert 32 (or 64) IP channels (or 4 HDMI/AV+28 IP channels, or 8 HDMI/AV+24 IP channels) to analog RF out
• Suport CC/Subtitle/Teletext
• Support BISS De-scrambling
• Support program info modify, multiple audio select 
• 2 (or 4) GE ports for IP MPTS/SPTS input, Max 840Mbps for each GE input
• Support HEVC/H.265, H.264/AVC, MPEG-2 TS Decoding
• 32 (or 64) standard PAL or NTSC or SECAM TV programs output via 32 (or 64) non-adjacent or adjacent carriers output within 400MHz
• Redundancy power supply for option
• Compact body, Freight saving
• Support Web-based Network management