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6.4
Line Level Adjustment
6.4
Line Level Adjustment
Step
Input
1
Signal generator on
centre frequency
channel to J1.
Modulation ON.
Level 1 millivolt
6.5 Reference Oscillator Calibration
Step
Input
1
None required
7
Specifications
7.1
General Description
The receiver is a high performance, frequency synthesized, narrow band FM unit
which can be used in conjunction with transmitter and power supply modules as a
base station or as a stand alone receiver. All necessary control and 600 Ω line
interface circuitry is included.
7.1.1
Channel Capacity
Although most applications are single channel, it can be programmed for up to 100
channels numbered 0-99. This is to provide the capability of programming all
channels into all of the receivers used at a given site.
7.1.2
CTCSS
The CTCSS tone or no tone can also be programmed for each channel. So that each
channel number can represent unique RF and tone frequency combination.
7.1.3
Channel Programming
The channelling information is stored in a non-volatile memory chip and can be
programmed via the front panel test connector using a PC and RF Technology
supplied TecHelp/Service Monitor 2000 software.
Page 18
6 ALIGNMENT PROCEDURE
Measure
Audio level test socket
pin 6 to pin 1
Measure
Frequency junction of
R69 and R26 on the
top of the PCB. (LO
input to the mixer)
Adjust
RV3 for 390 mV rms
Adjust
C181 or XO1 for L.O.
+/-100 Hz
L.O. = Fc+45 MHz
RF Technology R220
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