RF Technology R150 Betriebsanleitung PDF herunterladen (Seite 18)

Page 18 RF Technology T70/T150

6.3 TCXO Calibration 6 FIELD ALIGNMENT PROCEDURE

4. Measure the voltage between pins 9 and 1 of the test socket (TUNE V), and adjust

C99 to obtain 4.5±0.2V, while the TX LED is ON and the ALARM LED is OFF.

6.3 TCXO Calibration

1. Select a channel at the center frequency (half way between the highest and lowest

frequencies for the model in question).

2. Disconnect the Audio input (no signal input).

3. Key the PTT line.

4. Measure the carrier frequency at the output connector, and adjust XO1 until the

correct carrier frequency is measured, ±50Hz.

6.4 Modulation Balance

1. Set RV3 fully CCW (sub-tone off).

2. Set RV1 fully CW (maximum deviation)

3. Set RV2 mid-position

4. Set JP7 for flat response

5. Key the transmitter on

6. Set the audio input to 150Hz, 0dBm.

7. Measure deviation and adjust RV4 (line Level) for a deviation of 5kHz (2.5kHz

for narrow band transmitters).

8. Set the audio input to 1.5kHz, 0dBm.

9. Adjust RV2 (Mod. Bal.) for a deviation of 5kHz (2.5kHz for narrow band

transmitters).

10. Repeat steps 6-9 until balance is achieved.

11. Key the transmitter off.

12. Return JP7 to its correct setting.

13. Carry out the Deviation (section 6.6) and Tone Deviation (section 6.5) alignment

procedures.

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RF Technology R150 Betriebsanleitung Seite 18