RF Engineering

In GSM cellular networks, an absolute radio-frequency channel number (ARFCN) is a code that specifies a pair of physical radio carriers used for transmission and reception in a land mobile radio system, one for the uplink signal and one for the downlink signal .

If you want everyone to hear your broadcast, or at least as many people as possible, use the 88–108 MHz band, that’s where all the commercially made, personal radio receivers work and all the commercial broadcast radios work. Based on the rule, we produced TR502 and TR505 with the 88~108MHz frequency.

Channel is a number assigned to a frequency tuner so humans can remember a simple number and where the information is for the tuner to show . The frequency is where the information is riding it is a carrier for the channel. For example channel 2 analog information is at 55.25 mhz.

(2.4 Ghz) RF. RF refers to the electromagnetic wave frequencies within a range of 3 kHz to 300 GHz , including the frequencies used for communications or Radar signals.