EFJohnson 764X, 761X service manual UHF Adjustments CONT’D, UHF Adjustment Points

ADJUSTMENT PROCEDURE

UHF ADJUSTMENTS (CONT’D)

CP1

PLL lock voltage check point

L23

PLL lock voltage adjustment

L26

PLL lock voltage adjustment

Figure 6-6 UHF Adjustment Points

6.7.4 DTCS WAVEFORM ADJUST

1.Select the channel on the low end of the pro- grammed for DTCS code 007N (Test Ch. 5).

2.On the computer screen, scroll to “DTCS N” if set- ting a narrow band channel or “DTCS W” if setting a wideband channel.

3.Key the transmitter and view the demodulated sig- nal on the CRT of a communications monitor.

4.Press the adjust keys on the computer so that the waveform appears as follows:

Set For

Flat

Waveform

5.If the transceiver operates on both narrow and wide band channels, select Test Ch. 7 and also set the waveform on that channel (see note in Table 6-2).

	November 1998
6-9	Part No. 001-7600-001