The 104-17 transponder antenna is a mono-pole antenna that has a top loaded sphere which creates a factor of reliability and safety for a shorter antenna. This antenna offers a voltage standing wave ratio of 1.2:1 at 1,090 MHz and less than 2:1 at 1,030 MHz when connected with a 50Ω coaxial transmission line. The 104 series antennas feature an omni-directional, vertical-polarize radiation pattern when mounted to the underside of the aircraft.
- Frequency: 978 MHz
- Standing Wave Ratio: 1.7:1
- Frequency: 978 MHz
- VSWR: 978 MHz: 1.7:1; 1090 MHz: 1.2:1; 1030 MHz: 2:1
- Polarization: Vertical
- Radiation pattern: Omni-directional
- Impedance: 50Ω
- Connector: BNC (female)
- Altitude: 50,000 ft
- Airspeed: 350 mph
- Mounting: One-hole mounting
