DTMF - Revision history

Carlb: may also be used to enable or configure announcements and control operations by repeater owners

2009-06-17T15:17:48Z

may also be used to enable or configure announcements and control operations by repeater owners

← Older revision		Revision as of 08:17, 17 June 2009
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	DTMF '''D'''ual '''T'''one '''M'''ulti '''F'''requency		DTMF '''D'''ual '''T'''one '''M'''ulti '''F'''requency

	DTMF is used in ham radio in applications such as [[IRLP]] and [[Echolink]]. It is sometimes known as tone dialling and allows the user to send a series of tones that activate or disable a remote repeater or service.		DTMF is used in ham radio in applications such as [[IRLP]] and [[Echolink]], as a means to dial outside numbers via [[phone patch]] and as a means for repeater owners to configure the system remotely. It is sometimes known as tone dialling and allows the user to send a series of tones that activate or disable a remote repeater or service.

	==Why DTMF?==		==Why DTMF?==

	The DTMF system was developed to encompass as wide a range of potential signals as possible. In practice today, ~~mot~~ hams will only use the numerical combinations. For example, to open [[IRLP]] 6556, the operator will press the talk button on the microphone and then press the digits 6556 also on the microphone.		The DTMF system was developed to encompass as wide a range of potential signals as possible. In practice today, most hams will only use the numerical combinations. For example, to open [[IRLP]] 6556, the operator will press the talk button on the microphone and then press the digits 6556 also on the microphone.

	Each letter and number is allocated a pair of tones, a high tone and a low tone.		Each letter and number is allocated a pair of tones, a high tone and a low tone, using the same DTMF frequencies as on telephone land lines.

	The following table shows the pairs of signals used for the digits 0 - 9, letters A - D and characters * and #		The following table shows the pairs of signals used for the digits 0 - 9, letters A - D and characters * and #

TimVK4YEH at 07:05, 17 June 2009

2009-06-17T07:05:59Z

← Older revision		Revision as of 00:05, 17 June 2009
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	\|align=center\| D		\|align=center\| D
	\|}		\|}

			{{operation}}

TimVK4YEH at 07:59, 15 June 2009

2009-06-15T07:59:39Z

← Older revision		Revision as of 00:59, 15 June 2009
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	==DTMF== '''D'''ual '''T'''one '''M'''ulti '''F'''requency		DTMF '''D'''ual '''T'''one '''M'''ulti '''F'''requency

	DTMF is used in ham radio in applications such as [[IRLP]] and [[Echolink]]. It is sometimes known as tone dialling and allows the user to send a series of tones that activate or disable a remote repeater or service.		DTMF is used in ham radio in applications such as [[IRLP]] and [[Echolink]]. It is sometimes known as tone dialling and allows the user to send a series of tones that activate or disable a remote repeater or service.

TimVK4YEH: added some info

2009-06-15T07:59:12Z

added some info

New page

==DTMF== '''D'''ual '''T'''one '''M'''ulti '''F'''requency

DTMF is used in ham radio in applications such as [[IRLP]] and [[Echolink]]. It is sometimes known as tone dialling and allows the user to send a series of tones that activate or disable a remote repeater or service.

==Why DTMF?==

The DTMF system was developed to encompass as wide a range of potential signals as possible. In practice today, mot hams will only use the numerical combinations. For example, to open [[IRLP]] 6556, the operator will press the talk button on the microphone and then press the digits 6556 also on the microphone.

Each letter and number is allocated a pair of tones, a high tone and a low tone.

The following table shows the pairs of signals used for the digits 0 - 9, letters A - D and characters * and #

{|
|+ DTMF keypad frequencies
|-
!align=center|
!align=center| 1209 Hz
!align=center| 1336 Hz
!align=center| 1477 Hz
!align=center| 1633 Hz
|-
!align=center| 697 Hz
|align=center| 1
|align=center| 2
|align=center| 3
|align=center| A
|-
!align=center| 770 Hz
|align=center| 4
|align=center| 5
|align=center| 6
|align=center| B
|-
!align=center| 852 Hz
|align=center| 7
|align=center| 8
|align=center| 9
|align=center| C
|-
!align=center| 941 Hz
|align=center| *
|align=center| 0
|align=center| #
|align=center| D
|}