EFJohnson 764X, 761X VHF Test Frequencies, UHF Test Frequencies, COMPUTER-AIDED Tuning

ADJUSTMENT PROCEDURE

Table 6-1 VHF Test Frequencies

Test Channel	Tx/Rx Freq	Power	Call Guard	Bandwidth [1]
	(MHz)		Squelch
1	174.050	Low1	None	Narrow or wide
2	146.050	Low1	None	Narrow or wide
3	160.050	High	None	Narrow or wide
4	160.050	Low2	None	Narrow or wide
5	160.050	Low1	None	Narrow or wide
6	160.050	Low1	007N DTCS	Narrow or wide
7 [1]	160.050	Low1	None	Alternate
8 [1]	160.050	Low1	007 DTCS	Alternate

[1] If the transceiver operates on only narrow or wide band channels, program only chan- nels 1-6, and program them for the type of channels used (narrow or wide band). If the transceiver operates on both wide and narrow band channels, program additional channels 7 and 8 for the other type of operation.

Table 6-2 UHF Test Frequencies

Test Channel		Model (see Section 1.4)			Power	Call Guard	Bandwidth [1]
	400-430 MHz	450-470 MHz	470-490 MHz	488-512 MHz		Squelch
1	400.050	450.050	470.050	490.050	Low1	None	Narrow or wide
2	430.050	470.050	490.050	512.050	Low1	None	Narrow or wide
3	400.050	450.050	470.050	490.050	High	None	Narrow or wide
4	400.050	450.050	470.050	490.050	Low2	None	Narrow or wide
5	400.050	450.050	470.050	490.050	Low1	007N DTCS	Narrow or wide
6 [1]	400.050	450.050	470.050	490.050	Low1	None	Alternate
7 [1]	400.050	450.050	470.050	490.050	Low1	007N DTCS	Alternate

[1] If the transceiver operates on only narrow or wide band channels, program only channels 1-5, and program them for the type of channels used (narrow or wide band). If the transceiver operates on both wide and narrow band channels, program additional channels 6 and 7 for the other type of operation.

6.1.4 COMPUTER-AIDED TUNING

To make most adjustments described in the fol- lowing information, the computer setup used for pro- gramming (see Section 4) and special Adjust software are required. The Adjust software is included on the disk with the programming software in a separate sub- directory called ADJ. To set up the transceiver for use with this equipment, proceed as follows:

1.Copy the Adjust software to the hard disk or a pro- gramming disk as described in Section 4.1.3

2.Turn transceiver power on and connect the com- puter to the transceiver microphone jack using the programming cable and fabricated test cable described in the preceding section (see Figure 6-1).

3.Start the computer in the DOS mode. Make the cur- rent directory the ADJ subdirectory and start the program by typing the following:

ADJUST /X /Y

X = A - VHF (normal crystal), B - UHF (TCXO) Y = 1 - Serial port 1, 2 - Serial port 2

For example, if tuning a VHF transceiver and the programming cable is connected to serial port 2 of the computer, type ADJUST /A /2 (ENTER).

4.The tune data in the connected transceiver is then downloaded and the adjustment screen shown in Figure 6-2is displayed. The information displayed

	November 1998
6-3	Part No. 001-7600-001