What it is and what it connects
The Siemens 6GT2791-6AH30 is a SIMATIC RTLS accessory: a 3 m coaxial antenna cable terminated with an FME (female, straight) on one end and an R-SMA (male, straight) on the other. It is designed as a plug-in cable for connecting an FME antenna to a transponder or gateway in an RTLS (Real-Time Locating System) deployment. The cable is rated at 50 Ω characteristic impedance and delivers a typical attenuation of 0.053 dB/m at 2.4 GHz — the ISM band used by most active RFID and RTLS systems. That loss figure is low enough to run a 3 m jumper without meaningful signal degradation at the receiver front end.
Cable construction and environmental ratings
The cable sheath is halogen-free and silicon-free, with a braided shield made of tin-plated copper wires. The sheath color is RAL 6034 (pastel turquoise), and the outer diameter tolerance is held to ±0.2 mm — tight enough for consistent gland fit in an IP-rated enclosure. Operating temperature range is -40 to +80 °C, matching storage and transport ranges. Installation temperature is slightly narrower at -25 to +80 °C, which matters if you are pulling cable in an unheated building during winter commissioning. The cable is UV-resistant and carries flame-resistance ratings per UL 1685 (vertical tray), UL 1581 sec. 1090 (H), and ECE-R 118 § 6.2.6. Minimum bend radius is 31.5 mm for a single bend and 44 mm for multiple bends — respect those to avoid impedance mismatch or shield fracture.
Lifecycle and sourcing reality
This part carries a lifecycle status of NRND — Not Recommended for New Designs. Siemens will continue to support existing installations, but new projects should look at the current SIMATIC RTLS antenna cable offering.
Compliance and documentation
RoHS conformity is confirmed. The cable is halogen-free and silicon-free. Flame-resistance certifications include UL 1685 and UL 1581.