R:190807/0908Z
12908@LU3WAM.CHU.ARG.SOAM LinBPQ6.0.17
R:190807/0907Z 6842@GB7YEW.#79.GBR.EURO LinBPQ6.0.18
R:190807/0906Z 56792@VA7RBP.#SCBC.BC.CAN.NOAM LinBPQ6.0.18
R:190807/0905Z 33809@NS2B.#WNY.NY.USA.NOAM BPQ6.0.18
R:190807/0904Z 25357@N9PMO.#SEWI.WI.USA.NOAM BPQ6.0.18
R:190807/0904Z @:JE7YGF.03.JNET7.JPN.AS #:22502 [Ichinoseki] $:15026_GB7CIP R:190807/0903Z @:GB7CIP.#32.GBR.EURO #:15026 [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 ...
┌─────────────────────────────────┬───────────┬───────┬────┬────────>+5v rd
│ 4x 1n │ │ 47u=== ===220u pin 4
│ Keyboard ┌───┬───┬───┬──)───────────)───────┴────┤
│ Matrix rd === === === === │ │ │ ___ UP ye/bn
│ 1┼─2─┼─3─┼─A─┼───)───)───)───┤ │ │ ├─o o────>pin 6
│ │ │ │ │ bn│ │ │ │ │ │ wh│
│ 4┼─5─┼─6─┼─B─┼───)───)───┤ │ │ │ │ ___ DOWN bk/bl
│ │ │ │ │ or│ │ │ │ │ │ ├─o o────>pin 7
│ 7┼─8─┼─9─┼─C─┼───)───┤ │ │ │ 3.52 │ │
│ │ │ │ │ ye│ │ │ │ │ MHz │ │ ___ PTT bk
│ *┼─0─┼─#─┼─D─┼───┤ │ │ │ │ ┌┤[]├┐ │ bn├─o o────>pin 3
│ v│ g│ b│ w│ ┌─┴───┴───┴───┴──┴─┴────┴┐ │ │
│ i│ n│ k│ h├─┤9 14 13 12 11 1 7 osc8│ 47 │
│ │ │ ├───)─┤5 c row DTMF IC │ │ │
│ │ ├───)───)─┤4 o 8202 o/p │ │ 220u │
│ ├───)───)───)─┤31 l 10 6 16 │ ├────┤├──────┤
│ === === === ===└─────┬─────┬─────┬──────┘ │/ + │
│ └───┴───┴───┤ 15k │ ├────2k2─┤ │
│ 4x 1n │ _│_ │ │ │\e DTMF │
2k2 │ / \e │ │ └─12───LS────┤
│ │ │ └───┤ │ rd bk │
│ u1 │ │ mute │ │ │ MIC wh
├───┬────┤├────)─────┴───────)─────)──100───────┬────100───)────────>pin 2
│ │ │ │ │ │ │
Mic === + │ │ ├───┤├─47k─>3k3 DTMF │
│ │1n │ │ 10k +1u │ LEVEL │ Screen
└───┴──────────┴─────────────┴─────┴────────────┴──────────┴────────>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 SY
his uses two pure sine wave tones controlled from a 4x4 keypad matrix, a low-
frequency tone & 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 & 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
--- Mystic BBS v1.12 A43 (Linux/32)
* Origin: HAMRADIO telnet lu9dce.dynu.com (21:5/101)