EFJohnson 761X, 764X service manual Test Channels, Test Cable

ADJUSTMENT PROCEDURE

Supply Voltage

Internal Temp

PLL Lock Voltage

RSSI

DTCS Bal Level

Squelch Level

Selected Channel Info

RF Power Output

FM Deviation

DTCS Balance

Reference Frequency

Rx Bandpass Filter

IC5/IC12 D/A Outputs

Adjusts Current Vol Level

Squelch Level

NOTE: The above values for the various settings are examples only. Because of component tolerances, the optimum setting for each transceiver will probably be different.

Figure 6-2 Screen Display Example

Programming Cable	Pin 2 (Clone)	Pin 4 (PTT)
		Pin 8
		Pin 1
	PTT	To Transceiver
To Computer	Sw	Mic In
		Pin 7 (Ground)
	Pin 5 (MICE “+”)	Pin 6 (MIC “–”)

Figure 6-3 Test Cable Schematic

6.1.2 TEST CHANNELS

NOTE: Before programming the test channels, down- load the current programming data in the transceiver and save it to a disk file so that it can be reloaded after the adjustments are complete.

Test channels at the low, middle (VHF only), and high ends of the operating band, and High, Low1, and Low2 RF output power are required to perform the adjustments in this section. These test channels are listed in Tables 6-1and 6-2, and they must be pro- grammed as regular channels using the programming

software described in Section 4. There are no fixed test channels or test modes selectable with this transceiver.

6.1.3 TEST CABLE

The test cable shown Figure 6-3in must be fabri- cated to perform transceiver alignment. This cable is used in place of the adapter cable shown in Figure 4-1.It is required because in addition to connecting the computer to the microphone jack, a transmit audio and keying (PTT) signal must be applied to that jack. If desired, Replication Cable, Part No. 597-2002-200, can be modified to provide the 8-pin modular-style connector required for this test cable.

November 1998
Part No. 001-7600-001	6-2