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G8MNY  > TECH     27.11.25 19:26l 64 Lines 2953 Bytes #10 (0) @ WW
BID : 45958_GB7CIP
Read: GUEST
Subj: Yaesu DTMF Mic YM-48
Path: JH4XSY<N3HYM<K5DAT<GB7BED<GB7JED<GB7CIP
Sent: 251127/1021Z @:GB7CIP.#32.GBR.EURO #:45958 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                 (Revamp Nov 08)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

I use mine with FT790/690/290 for DTMF control of a repeaters etc.

This is the diagram of the mic, I reverse engineered it ...

 ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾄﾄ>+5v rd
 ｳ                      4x 1n      ｳ           ｳ   47u===  ===220u    pin 4
 ｳ Keyboard         ﾚﾄﾄﾄﾂﾄﾄﾄﾂﾄﾄﾄﾂﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄｴ
 ｳ  Matrix  rd     === === === === ｳ           ｳ            ｳ ___ UP ye/bn
 ｳ 1ﾅﾄ2ﾄﾅﾄ3ﾄﾅﾄAﾄﾅﾄﾄﾄ)ﾄﾄﾄ)ﾄﾄﾄ)ﾄﾄﾄｴ  ｳ           ｳ            ﾃﾄo oﾄﾄﾄﾄ>pin 6
 ｳ  ｳ   ｳ   ｳ   ｳ bnｳ   ｳ   ｳ   ｳ  ｳ           ｳ          whｳ
 ｳ 4ﾅﾄ5ﾄﾅﾄ6ﾄﾅﾄBﾄﾅﾄﾄﾄ)ﾄﾄﾄ)ﾄﾄﾄｴ   ｳ  ｳ           ｳ            ｳ ___ DOWN bk/bl
 ｳ  ｳ   ｳ   ｳ   ｳ orｳ   ｳ   ｳ   ｳ  ｳ           ｳ            ﾃﾄo oﾄﾄﾄﾄ>pin 7
 ｳ 7ﾅﾄ8ﾄﾅﾄ9ﾄﾅﾄCﾄﾅﾄﾄﾄ)ﾄﾄﾄｴ   ｳ   ｳ  ｳ  3.52     ｳ            ｳ
 ｳ  ｳ   ｳ   ｳ   ｳ yeｳ   ｳ   ｳ   ｳ  ｳ   MHz     ｳ            ｳ ___ PTT bk
 ｳ *ﾅﾄ0ﾄﾅﾄ#ﾄﾅﾄDﾄﾅﾄﾄﾄｴ   ｳ   ｳ   ｳ  ｳ ﾚｴ[]ﾃｿ    ｳ          bnﾃﾄo oﾄﾄﾄﾄ>pin 3
 ｳ vｳ  gｳ  bｳ  wｳ ﾚﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾁﾄﾁﾄﾄﾄﾄﾁｿ   ｳ            ｳ
 ｳ iｳ  nｳ  kｳ  hﾃﾄｴ9 14 13  12 11  1 7 osc8ｳ  47            ｳ
 ｳ  ｳ   ｳ   ﾃﾄﾄﾄ)ﾄｴ5  c  row  DTMF IC      ｳ   ｳ            ｳ
 ｳ  ｳ   ﾃﾄﾄﾄ)ﾄﾄﾄ)ﾄｴ4  o       8202  o/p    ｳ   ｳ   220u     ｳ
 ｳ  ﾃﾄﾄﾄ)ﾄﾄﾄ)ﾄﾄﾄ)ﾄｴ31 l 10    6     16     ｳ   ﾃﾄﾄﾄﾄｴﾃﾄﾄﾄﾄﾄﾄｴ
 ｳ === === === ===ﾀﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾂﾄﾄﾄﾄﾄﾄﾙ ｳ/    +        ｳ
 ｳ  ﾀﾄﾄﾄﾁﾄﾄﾄﾁﾄﾄﾄｴ      15K    ｳ     ﾃﾄﾄﾄﾄ2K2ﾄｴ              ｳ
 ｳ     4x 1n    ｳ      _ｳ_    ｳ     ｳ        ｳ\e     DTMF   ｳ
2K2             ｳ      / \e   ｳ     ｳ          ﾀﾄ12RﾄﾄLSﾄﾄﾄﾄｴ
 ｳ              ｳ     ｳ   ﾀﾄﾄﾄｴ     ｳ              rd    bk ｳ
 ｳ        u1    ｳ     ｳ mute  ｳ     ｳ                       ｳ MIC wh
 ﾃﾄﾄﾄﾂﾄﾄﾄﾄｴﾃﾄﾄﾄﾄ)ﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄ)ﾄﾄﾄﾄﾄ)ﾄﾄ100Rﾄﾄﾄﾄﾄﾄﾂﾄﾄﾄ100Rﾄﾄﾄ)ﾄﾄﾄﾄﾄﾄﾄﾄ>pin 2
 ｳ   ｳ          ｳ             ｳ     ｳ            ｳ          ｳ
Mic ===  +      ｳ             ｳ     ﾃﾄﾄﾄｴﾃﾄ47Kﾄ>3K3 DTMF    ｳ
 ｳ   ｳ1n        ｳ             ｳ    10K +1u       ｳ LEVEL    ｳ Screen
 ﾀﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄ>Pin 1

Here the UP & DOWN button are connected to earth, but they can be to +5V for
some rigs! So check your rig handbook to see which it needs.

DTMF SYSTEM
This uses two pure sine wave tones controlled from a 4x4 keypad matrix, a low-
frequency tone and a high-frequency tone, to specify 1 of the 16 options.

Pressing 2 keys in the same row/column, normal results in a single tone.

 TONE HIGH 1209Hz 1336Hz 1477Hz 1633Hz
  LOW
  697 Hz     1      2      3      A
  770 Hz     4      5      6      B
  852 Hz     7      8      9      C
  941 Hz     *      0      #      D

Frequency tolerance:         �1.5%

The 2 tones must not clip or mix on the Tx/RF path/Rx as the DTMF Rx IC uses
the presence of more than 2 tones to identify the signal non DTMF & ignores it.


Why Don't U send an interesting bul?

73 de John G8MNY @ GB7CIP


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