Tait tm8200 Accessories Manual

TM8100/TM8200 Accessories Manual TOPA-SV-024 Test Unit 135
© Tait Electronics Limited August 2005
18.2 Operation
This section explains the function of the TOPA-SV-024 test unit controls.
The procedure for using the test unit is described in the section of the
service manual covering test equipment.
18.2.1 TOP / TM8000 switch
This 2-way toggle switch is used to switch attenuation resistors (R4, R5, R6)
in and out of the line from the radio’s positive speaker output to the positive
receive audio/SINAD output of the test unit (before the isolating transformer).
■ When set to TOP, the attenuation resistors are switched out.
■ When set to TM8000, the attenuation resistors are switched in
(attenuation 10:1).
Important Selecting the wrong switch position can result in incorrect
SINAD readings.
18.2.2 TOP Mod Audio / Off / Mic Audio switch
This 3-way toggle switch is used to switch between Mod Audio (Tait Orca
portables only), Mic Audio, and Off (no audio signal).
■ With the Tait Orca portables, this switch can be used for setting up dual
point modulation by applying modulation to different parts of the radio.
■ For normal transmit deviation tests (Tait Orca portables and TM8000),
this switch is set to Mic Audio.
18.2.3 Hook On / Hook Off switch
Important When using the test unit with Tait Orca portables, the
Hook On / Hook Off toggle switch must be set to
Hook Off. Tait Orca portables do not have a hookswitch,
and if the switch is set to Hook On, the Tait Orca portable
F1 function is activated.
This 2-way toggle switch is used to simulate the microphone hookswitch
opening (“hook off”) and closing (“hook on”). This is done by switching a
12kΩ resistor (R3) in or out of the MIC_PTT line.
■ When set to Hook Off, the 12kΩ resistor (R3) is switched out of the
MIC_PTT line. This simulates the microphone being removed from the
microphone clip.
■ When set to Hook On, a 12kΩ resistor (R3) is switched into the
MIC_PTT line. This simulates the microphone being placed on the
microphone clip.

Tait tm8200 Specifications

General

Operating Temperature Range	-30°C to +60°C
IP Rating	IP54
Channel Spacing	12.5 kHz, 25 kHz
Battery Life	N/A (Mobile Radio)
Frequency Range	136-174 MHz, 400-470 MHz