#amateurradio

India’s 5.9 GHz C-V2X notification is an important step. But opening the band is only the beginning. The Department of Telecommunications has created an exemption framework for Cellular Vehicle-to-Everything communication in the 5875–5905 MHz band, with defined RF limits such as 23 dBm/MHz maximum power spectral density, 33 dBm maximum EIRP, and -30 dBm/MHz out-of-band emissions. That gives connected mobility a clearer regulatory path. But anyone who has spent serious time with RF knows one thing: A band is not “ready” just because it is available. a. It has to be measured. b. It has to be characterised. c. It has to be understood in the field. At 5.9 GHz, the physics is unforgiving. Link margins can disappear quickly. Antenna placement matters. Vehicle shadowing matters. Roadside clutter matters. Multipath, Doppler, interference, congestion, timing drift, and front-end behaviour all matter. On paper, V2X is a packet. On the road, it is a microwave signal trying to survive a very hostile channel. This is where I believe amateur radio experience becomes relevant. Amateur microwave operators around the 5.7 GHz region understand link budgets, antenna gain, feeder loss, receiver sensitivity, noise figure, frequency stability, and the small dB losses that decide whether a signal decodes or disappears. Weak-signal operators understand timing discipline, coding gain, and decoding close to the noise floor. APRS operators have lived through shared-channel congestion, over-beaconing, relay storms, and the limits of polite access protocols. Direction-finding operators understand that detecting a signal is one thing; locating the physical emitter is another. These are not abstract ideas. They are operating realities. That is why I wrote my article: Lessons From the Bands: Amateur Radio Technical Practice as a Resource for V2X Research (https://lnkd.in/gvdkPaHC) V2X should not rediscover old RF lessons the hard way. India has opened the regulatory door. Now we need to build the measurement culture around it: passive roadside sensing, open 5.9 GHz propagation data, interference mapping, congestion studies, timing-resilience experiments, and security models that connect the digital message to the physical signal. Because in V2X, trust does not begin at the packet. It begins at the channel. Check here - https://lnkd.in/g2Rn2rg4 #V2X #CV2X #ConnectedVehicles #AutomotiveCybersecurity #AmateurRadio #India