Service Manual Part 6
673)
#
;#8
Provision has been made on the T2000-80 PCB for many different application condi-
tions. Refer to the circuit diagram, PCB layout, the T2000 options connections table
below, and the T2000-80 Signal Specifications table for details of options and links.
The PCB links are either solder shorted or fitted with 0Ω SMD resistors.
To prevent the possibility of damage, check the Signal Specifications table
before attempting to change the configuration.
The following table sets out the standard T2000-80 linking options for T2010 and T2020
models.
((!
*C60 (4µ7):This is provided to give a slight time delay to the Rx gate signal, if required.
*C64 (1µ): This is provided to give a slight time delay to the release of transmit, if
required.
*C120 (4n7): Provision has been made on the PCB to fit an extra potted mylar capacitor
for line matching, if required.
Link Option
LINK1A Rx de-emphasis
LINK2B
LINK27B
LINK28B
6 pole line output filter
LINK3A
LINK4A
600 ohm output
LINK5 0dB line output attenuation
LINK9 Line input and output linked
LINK12B
LINK13
Tx pre-emphasis
LINK16A Mic. mute on line input PTT
LINK17A Rx gate standard radio (T2010/T2020)
LINK18A Opto control standard
LINK19A Auxiliary control
LINK20A PTT in
LINK21A Key (0V)
LINK22B Busy (0V)
LINK24A Output (Tx5V/Rx0V)
LINK26B Synth in Lock (0V)