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downlink_tone [2020/12/07 13:52] kd6kpc [Why Program a Downlink Tone] |
downlink_tone [2020/12/07 13:58] kd6kpc |
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RepeaterBook enters and displays data from the perspective of the remote (user) radio. | RepeaterBook enters and displays data from the perspective of the remote (user) radio. | ||
- | ==== Why Program a Downlink Tone ==== | + | ===== Why Program a Downlink Tone ===== |
If a repeater has an uplink tone, you must enter it to access the repeater. But, if you don't program a downlink tone (often called a decode tone) into your radio, you can still hear the repeater uninhibited. In fact, many repeaters do not transmit a downlink tone. So why bother to program one in if you can hear the repeater without it? | If a repeater has an uplink tone, you must enter it to access the repeater. But, if you don't program a downlink tone (often called a decode tone) into your radio, you can still hear the repeater uninhibited. In fact, many repeaters do not transmit a downlink tone. So why bother to program one in if you can hear the repeater without it? | ||
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The reason why is because you can hear // | The reason why is because you can hear // | ||
- | Especially in urban areas, there is a greater potential for RF noise. This elevated noise can produce signals with enough strength to deactivate the squelch on your radio and pass the unwanted signals. So, you elevate the squelch threshold, which works until you are in the fringe areas of the repeater and you need to lower the squelch threshold. Sometimes, the RF noise can come in full scale. These " | + | Especially in urban areas, there is a greater potential for RF noise. This elevated noise can produce signals with enough strength to deactivate the squelch on your radio and pass the unwanted signals. So, you elevate the squelch threshold, which works until you are in the fringe areas of the repeater and you need to lower the squelch threshold. Sometimes, the RF noise can come in full scale. These " |
- | When you program a downlink tone, you ensure that the only signal that can break the squelch on your radio is a signal that is carrying that tone. RF noise and birdies won't be carrying the tone. It will also filter out distant repeaters on the same frequency, as long as they are not transmitting the same tone. Think of it as preventing interference from activating the speaker on your radio. Added bonus, especially when scanning, you will have a quieter radio and won' | + | When you program a downlink tone, you ensure that the only signal that can break the squelch on your radio is a signal that is carrying that tone. It will also filter out distant repeaters on the same frequency, as long as they are not transmitting the same tone. You will have a quieter radio overall |
- | Refer to the Repeaterbook | + | Refer to the RepeaterBook |
- | ==== CTCSS (Continuous Tone-Coded Squelch System) Codes ==== | + | ===== CTCSS (Continuous Tone-Coded Squelch System) Codes ===== |
All tones are in Hz. | All tones are in Hz. | ||
< | < | ||
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</ | </ | ||
- | ==== DCS Codes ==== | + | ===== DCS Codes ===== |
< | < | ||
< | < | ||
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- | ==== Related Links ==== | + | ===== Related Links ===== |
* [[https:// | * [[https:// |