Raymarine RAY 210VHF Frequency Adjustment Transmitter, Modulation Adjustment Transmitter

5.3.3Frequency Adjustment (TRANSMITTER)

1)Connect the coupler output to a frequency counter, set the radio on CH16 (156.800MHz), key to transmit, and read the indication on the frequency counter.

2)Adjust trimmer capacitor CV1 on the RF module for the desired frequency (156.800MHz) ±200Hz on the frequency counter.

5.3.4Modulation Adjustment (TRANSMITTER)

1)Connect the coupler output to an FM linear detector.

Connect an audio oscillator to the microphone connector and key to transmit.

2)Set the audio oscillator output to –20dBm, 300Hz and adjust RV5 on the RF module for a deviation on 4.5 kHz ±300Hz.

3)Set the audio oscillator output to –43dBm, 1kHz and read the deviation meter (±2.8 kHz ~ ±3.2 kHz).

5.3.5Power Output Adjustment

1)Connect an RF power meter to the antenna connector through the coupler. Key to transmit and adjust RV1 and RV2 on the RF Board as shown in Table 5- 2.

Sequence	Condition	Adj. Point	Target Power
1	13.6VDC H/L:L	RV1	0.9W ±0.05W
		Low Power	(limit 1.0W)
2	13.6VDC H/L:H	RV2	24W ±0.5W
		High Power	(limit 25W)

Table 5-2

5.3.6RF Sensitivity Adjustment (RECEIVER)

1)Connect an RF signal generator to the antenna connector and a SINAD meter to the external speaker line.

2)Set the deviation of the RF signal generator to lkHz+/-3Hz.

3)Set the output level of the RF signal generator and adjust T1 ~ T7, T9 and T10 on the RF module, as shown in Table 5-3.

Sequence	Condition	Adj. Point	Target Level
1	CH.88(157.425 MHz) SG. output:	T2 ~ T7	Max. Sensitivity
	60dB µ	T9,T10
2	CH.WXO SG. output: –6dB µ	T2 ~ T7	Over 12dB SINAD
		T9,T10

Table 5-3

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