Motorola MICOM-2RS User's Guide download pdf (Page 87)

Technician Mode

68P02953C05 12-9

12.3.2.2. Oscillator Calibration Procedure

CAUTION

During the calibration procedure, the radio transmits in CW

(Continuous Wave) mode via its RF output.

1. Prior to calibration, set an external reference frequency with the highest possible value.

Perform the manual oscillator calibration in transmit mode according to the following

steps:

2. For a standard oscillator (PENDULUM), load the frequency word from the radio. For a

high stability oscillator (OCXO), load the frequency and the temperature words from the

radio, or, following oscillator replacement, type the words which appear on the oscillator

package.

3. To start manual calibration in transmit mode, press the Start Calibration button. The

RSS sends a message to the radio, which in turn starts transmitting on the selected

transmit frequency channel.

4. Read the RF counter measurement.

5. Press the Stop Calibration button and compare the measurement result to the Radio

Specifications.

6. If the measurement result does not match the specifications, modify the frequency word

and go back to step 2. (It is not recommended to change the temperature word.)

7. If the measurement result matches the specifications, press the OK button. A message to

load the measured frequency into the radio using the Write Device command appears on

the screen.

12.3.3. Manual Calibration - Receive Mode

12.3.3.1. Oscillator Calibration Setup

To perform manual oscillator calibration, connect the setup illustrated below:

EXTERNAL

REFERENCE

AUDIO

ANALYZER

MICOM2 RADIO

UNDER TEST

ACCESSORY PLUG ANTENNA OUT

AUDIO

GND

RSS

Figure 12-12. Oscillator Calibration Setup - Manual Receive Mode

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Motorola MICOM-2RS User's Guide Page 87