Tait TM9000 User Manual

TA2922 Universal Line Interface Service Manual 27
© Tait Electronics Limited March 2010
SK1 I/O signal descriptions
A LINE OUT 1
■ Signal direction: output
■ Signal level: -30 to +10dBm
■ Signal impedance: 600 ohms
Half of the isolated balanced audio output line, paired with LINE OUT 2. Audio
is from radio receiver which is optionally summed with line in audio when the
optional side tone adjustment pot RV3 is fitted. The radio RX audio to line output
level is adjusted by VR1. The radio signal source is fixed in level with
AUD_TAP_OUT is selected or is varied with the radio volume control if the
RX_AUD source is selected as an option in the TA2922 programmable options.
Note that in some radio configurations the RX_AUD level becomes fixed and is
not volume controlled, such as when some remote head or multi-head options are
in use. The frequency response of audio sourced from AUD_TAP_OUT is defined
in the programmable audio options of the radio, while audio sourced from
RX_AUD is de-emphasised. Depending on link population, the line output pair
can be used for 2-wire audio in and out and for centre tap ‘phantom’ DC keying
options. See “Additional configuration links” on page 38. Frequency response is
from 50Hz to 3kHz.
L RSSI Analogue RSSI output from the radio Output 0-3VDC
M LINE IN UNBAL Unbalanced transmitter audio input Input 8mV to 1V RMS
N LINE OUT UNBAL Unbalanced receiver audio output Output 25mV to 1V RMS
O GATE OUT DIRECT Open collector RX gate output Output 45VDC max
P PTT DIRECT Un-isolated PTT input Input 5VDC max
Q EXT GPIO3 Bidirectional I/O to/from radio Bidirectional 0-3.3VDC
R EXT GPIO4 Bidirectional I/O to/from radio and line
interface disable
Bidirectional 0-3.3VDC
S EXT GPIO5 Bidirectional I/O to/from radio Bidirectional 0-3.3VDC
T EXT GPIO6 Bidirectional I/O to/from radio Bidirectional 0-3.3VDC
U EXT GPIO7 Bidirectional I/O to/from radio Bidirectional 0-3.3VDC
V RADIO DATA IN Data to microcontroller (RS-232 level) Input -10 to +10V
W RADIO DATA OUT Data from microcontroller (RS-232 level) Output -10 to +10V
X RTS IN RTS input to microcontroller (RS-232
level) [not yet implemented]
Input -10 to +10V
Y CTS OUT CTS output from microcontroller (RS-232
level) [not yet implemented]
Output -10 to +10V
Z AUX I/O AC coupled line to J1, can connect to
radio speaker output via internal wire
Bidirectional N/A
Signal
Number
Signal Name Description
Direction
(relative to
TA2922)
Level

Tait TM9000 Specifications

General

Brand	Tait
Model	TM9000
Category	Computer Hardware
Language	English