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downlink_tone [2020/12/07 13:44] kd6kpc [Downlink Tone] |
downlink_tone [2020/12/07 13:58] kd6kpc |
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The tone system can also be applied to the downlink tone to limit interference and noise transmitted through the user's radio speaker. There are many sources of noise that can break the set squelch threshold, even though the repeater is not transmitting. Although the radio will still internally " | The tone system can also be applied to the downlink tone to limit interference and noise transmitted through the user's radio speaker. There are many sources of noise that can break the set squelch threshold, even though the repeater is not transmitting. Although the radio will still internally " | ||
- | Not all repeaters use a downlink tone. If a user sets tone squelch in their radio on a tone that is not being transmitted by the repeater, the squelch will never open and the user will never hear a transmission. Also, repeaters | + | Repeaters |
- | Downlink tone is not a term that is recognized by most amateurs and you probably won't see it in many radio manuals. Although, Yaesu tends to use the term. It's even been discussed on [[https:// | + | Downlink tone is not a term that is recognized by most amateurs and you probably won't see it in many radio manuals. Although, Yaesu tends to use the term in reference to digital IDs. It's even been discussed on [[https:// |
- | + | ||
- | Confusion sometimes occurs when it is not known from which radio, the user's or the repeater' | + | |
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, | + | Especially in urban areas, |
- | 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:// |