free space

1. A theoretical region of space utterly devoid of physical matter, gravitational fields, and electromagnetic fields. 2. A region devoid of physical obstructions that might hinder the propagation of electromagnetic signals. See also free space transmission.

• 20
• 2:1
• 2:1
• 2:1
• 218–219 MHz Service
• 22
• 23B+D
• 23B+D
• 24
• 256-QAM
• 2.5 Gbps
• 2.5 Gbps
• 2.5 Gbps
• 2.5G (Two point Five Generation)
• 26
• 28
• 2B1Q (2 Binary 1 Quaternary)
• 2B+D
• 2 Binary 1 Quaternary (2B1Q)
• 2 cps, 2 Hz
• 2G (2nd Generation)
• 3
• 30
• 30B+D
• 30B+D