User Tools

Site Tools


downlink_tone

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision Both sides next revision
downlink_tone [2019/02/10 22:51]
kd6kpc
downlink_tone [2019/03/09 16:06]
KD6KPC [Downlink Tone]
Line 12: Line 12:
 The tone system can also be applied to the downlink tone to limit interference and noise on the user's radio. 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 "hear" the noise, it will not open the squelch and transfer the audio to the speaker until the proper tone has been received.  The tone system can also be applied to the downlink tone to limit interference and noise on the user's radio. 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 "hear" the noise, it will not open the squelch and transfer the audio to the speaker until the proper tone has been received. 
  
-Not all repeaters use a downlink tone. If a user sets tone squelch in their radio on a tone that is not being tramsmitted by the repeater, the squelch will never open and the user will never hear a transmission. Also, repeaters may not transmit the same tone that is used to receive (uplink). This is called "split-toning." One should not make any assumptions as to whether or not a repeater is transmitting a tone and what the tone could.+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 may not transmit the same tone that is used to receive (uplink). This is called "split-toning." One should not make any assumptions as to whether or not a repeater is transmitting a tone and what the tone could.
  
-To reduce confusion as to which tone is being referenced in terms of a paired frequency set (duplex with separate input and output frequencies, as repeaters typically use, the downlink tone refers to the tone that the repeater is transmitting on the [[downlink_frequency|downlink frequency]]. If a user programs this feature into their radio, it is often known as "Tone Squelch." It is not required that a user radio program this tone to receive the repeater's downlink frequency.+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://www.reddit.com/r/amateurradio/comments/8wq967/repeater_downlink_tone/|Reddit]]. To reduce confusion as to which tone is being referenced in terms of a paired frequency set (duplex with separate input and output frequencies, as repeaterstypically use, the downlink tone refers to the tone that the repeater is transmitting on the [[downlink_frequency|downlink frequency]]. If a user programs this feature into their radio, it is often known as "Tone Squelch." It is not required that a user radio program this tone to receive the repeater's downlink frequency.
  
 Confusion sometimes occurs when it is not known from which radio, the user's or the repeater's, that is being requested. Usually, it seems to get turned around when a repeater owner enters that data. Many repeater coordination councils request the repeater's tones in terms of the repeater's transmit and receive tones, which are opposite from the user radio's on a duplex system. Confusion sometimes occurs when it is not known from which radio, the user's or the repeater's, that is being requested. Usually, it seems to get turned around when a repeater owner enters that data. Many repeater coordination councils request the repeater's tones in terms of the repeater's transmit and receive tones, which are opposite from the user radio's on a duplex system.
downlink_tone.txt ยท Last modified: 2021/02/27 14:11 (external edit)