Circuit Descriptions and Serial Control Information
...... 2
Control bits
Element
Post-Process Gain
Notes
A fixed 2.0dB gain stage.
A selectable pre-emphasis stage set around
1.0kHz, with a characteristic of 6dB per octave.
It is available for use when transmitting data signals
such as FFSK. See Table below for Powersave
information.
A pre-set amplitude limiting stage for deviation
control.
15
Pre-emphasis
Deviation Limiter
and
16
0
1
Post-Deviation Limiter Filter
– Narrow filter bandwidth,
cut-off = 2550Hz.
– Wide filter bandwidth,
cut-off = 3000Hz.
This lowpass filter which is selected with the
Deviation Limiter, is adjustable to Narrow (2550Hz)
and Wide (3000Hz) bandwidths, allowing for
different channel-spacing requirements.
17
0
1
CTCSS/Data Input
– Disable Input path to Mixer system
– Enable Input path to Mixer system
15
X
0
1
X
X
18
0
1
1
1
0
19
0
0
0
1
1
Pre-Emphasis
Powersaved
Powersaved
Enabled
Powersaved
Powersaved
Limiter and Post-Dev LPF
Powersaved
Enabled
Enabled
Powersaved
Powersaved
Drive Selected
Test Path
Post-ProcessPath
Post-Process Path
Post-Process Bypass
Bias
20
0
1
0
1
0
1
0
1
23
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
24
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
21
0
0
1
1
0
0
1
1
25
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
27
22
0
0
0
0
1
1
1
1
26
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VCO Reference Drive Attenuator
– Gain Set
-28dB
-24dB
-20dB
-16dB
-12dB
-8.0dB
-4.0dB
0.0dB
VCO Reference Drive Amplifier
– Gain Set
-2.75dB
-2.50dB
-2.25dB
-2.00dB
-1.75dB
-1.50dB
-1.25dB
-1.00dB
-0.75dB
-0.50dB
-0.25dB
0dB
0.25dB
0.50dB
0.75dB
1.00dB
Output Drive Control
The in-line control attenuator for the VCO reference
channel drive output.
The in-line control amplifier/attenuator for the VCO
reference channel drive output.
Used in conjunction with Bit 36 to control output
functions.
Reference ...... Figure 4
7
CMLMICRO [ CML MICROCIRCUITS ]
