cornercanyon
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Thank you. That is helpful, though I sense much to learn—@cornercanyon Valid point. Let me try to give a high level explanation for you.
TX and RX are "radio shorthand" for Transmit (TX) and Receive (RX).
Tones are a way to filter out transmissions. You set your receiver to look for a tone that can not be heard by people that will accompany a transmission. If your radio is set to listen for that and it is present, it will send the audio to the speaker. If it's not present, you won't hear it. This will filter out others on the same frequency from being heard and you will only hear those you want to hear.
Repeaters: It is when you transmit on one frequency and another station (the repeater) will receive your transmission and retransmit it on a different frequency. For this to work, your display will show your receive frequency and if you are in repeater mode, when you transmit, the radio will transmit at the repeater frequency which is an offset from your receive frequency. For example (I'm using ham frequencies since I'm more familiar with ham repeaters) if you are receiving at 148.88 and in repeater mode, when you push the "push to talk (ptt) button, it will transmit from your radio at 142.88. The repeater will receive the signal on 142.88 and retransmit at 148.88. Since your radio can not transmit and receive at the same time, your radio won't hear the repeater as long as that ptt button is pushed. There are also repeaters that use the tones explained above to filter out signals that should not be repeated.
16 or 462.5750: Just like CB, the channel has a corresponding frequency associated with it. Channel 16 of GMRS is 462.5750. You can find the frequencies and channels at GMRS Radio Frequencies and Channels | Right Channel Radios
Mode: this is where you are talking directly to another radio on the same frequency which is called simplex mode or if you're in repeater mode as I described above. There are other modes but those are the ones being used in GMRS
Power: FRS (Family Radio Service) is a no license needed radio system but you are limited to 2 watts of power. This is normally the small hand held radios. GMRS (General Mobil Radio Service) can use 50 watts of power. Some of the GMRS frequencies are also used by GMRS so they can talk to each other.
Band: As it was discussed in this thread, there is 2 meter band for hams which is 144.000 to 148.00 and 73cm band which is 430.000 to 440.000. GMRS and FRS are 462.55 to 467.7250. So the 73cm band is close to the GRMR frequencies and some ham radios have been modified to work on the GMRS bands.
Dual band: Those are ham radios that can be used on the 2 meter band or the 73cm band. They do not normally include GMRS or FRS.
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