June 2003 IPN: M5000-00-105 Tait Orca 5000 accessory connector F - 5
Table F-1: Accessory connector signal specifications
Connecting a headset
The headset must meet the following basic
specifications:
■ speaker impedance: 32 Ω (16 Ω min);
■ speaker power: 1/4 W
rms
(min);
■ microphone: electret, approximately
1kΩ; and
■ PTT: switch not in line with microphone.
Note that if your headset has a PTT in line
with the microphone, it can be connected
with the 7.5 mm accessory adaptor. See
“7.5 mm Accessory adaptor” on page F-8
for more information.
Determine the compatibility/suitability of
your headset by checking Table F-1. If it is
compatible, follow the assembly procedure
outlined previously, on page F-4.
Solder the headset wires onto the accessory
connector PCB pads, as shown in Table F-2.
To turn the radio speaker off and only have the
headset speaker on, short link 1 (LK1). This
ties SENSE-0-ACC to GND, telling the radio to
turn the speaker off.
Note that SPEAKER+ and SPEAKER– must
not short to GND, or to any other signal.
Table F-2: Accessory connector headset connections
Signal Description Type Signal level
Output
impedance
/current
Input
impedance
RX-DET-AF-ACC Unmuted receive audio Analogue audio
1.15-1.6 VDC
53-225 mV
rms
2.2 kΩ –
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 20 mA (max) –
RXD-ACC Serial receive data CMOS high = 0
low = 1
––
TXD-ACC Serial transmit data CMOS high = 0
low = 1
1 mA (max) –
SENSE-0-ACC Accessory sense
(internal speaker disable)
CMOS high = 1
low = 0
1 mA (max) –
SENSE-1-ACC Accessory sense CMOS high = 1
low = 0
1 mA (max) –
EXT-MIC External microphone input
(electret)
Analogue audio 11 mV
pp
(typical)
DC coupled
–1 kΩ
EXT-PTT External press-to-talk input Analogue DC 0-5 V, PTT = 0 V – 27 kΩ
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 –
* Dependent on battery charge level.
Solder to these pads Signal from headset
P1 MIC
P2 GND
P3 PTT
P6 SPEAKER–
P7 SPEAKER+
To Next Page
Loading...
