The 6GT2815-0BN20 is a 20-meter pre-assembled coaxial antenna cable with R-TNC sockets at both ends, built with LMR-300 coax (7.62mm OD, 50Ω). This is the mid-reach sweet spot in the SIMATIC RF600 antenna cable family—long enough to reach from a reader in the main control cabinet to an antenna mounted above a conveyor or inspection station on the other side of the machine frame, without stepping up to the bulk and stiffness of LMR-400.

When should I choose the 20-meter LMR-300 over other combinations?

The choice comes down to the physical distance between reader and antenna. At 20 meters: LMR-195 would introduce roughly 3.4 dB of loss—enough to noticeably shrink the read zone. LMR-400 would bring that down to about 1.2 dB, but at the cost of a 10mm+ OD cable that is difficult to route through dense panel wiring. LMR-300 sits in the middle at approximately 2.0 dB total loss, with a manageable 7.62mm OD. If the reader-to-antenna span is 15–25 meters, this is the cable. Shorter than 10 meters, drop down to LMR-195 for easier handling. Longer than 30 meters, step up to the LMR-400 variant (6GT2815-0BN40).