Tait TEL0048, TEL0049 Diagram of units
M850-00
T856/857 General Information
C1.3
The photograph in Figure 1.1 on the next
page will help you to identify the main
circuit blocks in the T856.
There is a similar photograph in Figure
4.4 which shows the main tuning and
adjustment controls.
Extending both these fold-outs will
allow you to refer to both photographs
while using the manual.
The photograph in Figure 1.2 on the next
page shows the T856 front panel controls.
Copyright TEL 31/09/98
C1.4
On LED
The On LED is lit when the
T856 is transmitting.
Carrier Switch
Keys the transmitter (while
disabling the 600Ω line and
microphone audio).
Supply LED
The Supply LED is lit when
DC power is supplied to the
transmitter.
Line Sensitivity
Sets the gain of the 600Ω line
input of the audio processor.
Microphone Socket
For connecting a T800-80 microphone to allow local control of
the transmitter. The 600Ω line is
disabled when the PTT button is
pressed.
T856/857 General Information
M850-00
1
B
10
A
C
9
7 8
234
microcontroller and CTCSS
duct for cabling to extra D-range (if fitted)
D-range
RF output
D-range connector (“D-range 1”) incl. audio in & DC in
(refer to Section 2.2 in Part F)
microcontroller
5 6
8910
low pass filterPAexciter drive amplifier
1234567
audio processor
A
B
VCO
regulators
C
synthesiser
Key:
Figure 1.1 T856 Main Circuit Block Identification Figure 1.2 T856 Front Panel Controls
31/09/98 Copyright TEL
M850-00
T856/857 General Information
C1.5
The photograph in Figure 1.3 on the next
page will help you to identify the main
circuit blocks in the T857.
There is a similar photograph in Figure
4.5 which shows the main tuning and
adjustment controls.
Extending both these fold-outs will
allow you to refer to both photographs
while using the manual.
The photograph in Figure 1.4 on the next
page shows the T857 front panel controls.
Copyright TEL 31/09/98
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