Operating instructions

RF Technology R350/R500 Page 15
6.4 Line Level Adjustment 6 ALIGNMENT PROCEDURE
7. Set generator level to 0.25µV, and measure SINAD on test socket pins 6 and 1.
Reduce generator level to obtain 12dB SINAD. Carefully adjust L5,L6,L7,L8 to
obtain the best SINAD. Reduce the generator output to maintain 12dB SINAD.
6.4 Line Level Adjustment
1. Set generator level at 1000µV (1mV), modulation on, tuned to the center
frequency channel frequency, apply signal to J1. Measure the audio level on pin
6 of the test socket wrt pin 1. Adjust RV3 for 350m Vrms.
6.5 TCXO Calibration
1. No input is required. Measure the frequency at the junction of R69 and R26 (LO
input to mixer) on the top of the PCB. Adjust XO1 for an LO frequency within
100Hz of the required value. The required value is center frequency plus or
minus 45.000MHz, plus for carrier frequencies below 450MHz, minus
otherwise.
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 600Ω 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.