Tait Orca series - Page 76

F - 4 Interfacing non-Tait accessories 11/98 IPN: 449-51000-01
SENSE-0/SENSE-1
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Table F-1: Accessory connector signal descriptions
Signal Description Type Signal level
Output
impedance
/current
Input
impedance
RX-DET-AF Unmuted receive audio Analogue audio
1.15-1.6 VDC
53-225 mV
rms
2.2 k
Ω
–
MOD-AUDIO Modulator input Analogue audio 0-4.8 V
pp
2.4 VDC – 470
Ω
+7V5-ACC* Accessory power DC supply 7.0 V* nominal
* Dependent on battery charge level.
20 mA (max) –
RXD Serial receive data CMOS high = 0
low = 1
––
TXD Serial transmit data CMOS high = 0
low = 1
1 mA (max) –
SENSE-0 Accessory sense
(internal speaker disable)
CMOS high = 1
low = 0
1 mA (max) –
SENSE-1 Accessory sense
(VOX mode)
CMOS high = 1
low = 0
1 mA (max) –
EXT-MIC External microphone input
(electret)
Analogue audio 11 mV
pp
(typical)
DC coupled
–1 k
Ω
EXT-PTT External push-to-talk input Analogue DC 0-5 V, PTT = 0 V – 27 k
Ω
EXT-SPKR External speaker differential output Analogue audio ±6.5 V
pp
differential
To drive 16
Ω
differentially
–
EXT+SPKR External speaker differential output Analogue audio ±6.5 V
pp
differential
To drive 16
Ω
differentially
–
RF Accessory antenna connection Radio frequency Tx: 5 W
rms
(max) 50
Ω
–