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36 Functional Description TB7100 Service Manual

3.4.12 Receiver Inhibit

The receiver inhibit input on the SYSTEM connector is used to control the

receiver gate signal. This may be used in linking applications to prevent

unwanted receiver audio signals from appearing at the SI board output

connector.

3.5 Fan Operation

The cooling fans are mounted behind the front panel. Both fans in the

chassis must be of the same type.

Dissipation of Heat Heat needs to be dissipated from a number of components on the transmitter

and receiver boards, including the following:

■ 9V regulator

■ RF PA

■ driver for RF PA

■ audio PA.

The mechanisms by which the heat is conducted away in each case are

described below.

Dissipation of Heat

from Transmitter

The transmitter board is mounted directly onto a heatsink through which

the forced air from the fans is ducted.

Dissipation of Heat

from Regulator and

Audio PA

Heat from the audio PA and 9V regulator on the receiver board id

conducted away by a small aluminium heatsink and mounting boss.

The heatsink and boss contact the underside of the board where the

components are mounted and thermal paste ensures a good thermal transfer

between the two surfaces.

Dissipation of Heat

from RF PAs and

Driver

Heat from the RF PAs and driver is conducted to the heatsink through a

copper separator plate. The copper plate is fixed to the underside of the

board and the components soldered directly to it. The copper plate is

mounted directly to the main heatsink boss and a coating of thermal paste

ensures good thermal transfer between these two surfaces.

Tait TB7100 Service Manual

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