Charles 7305-14 4W-2W, Руководство пользователя

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Section 730-514-202
17
8.2 Transmit Alignment Procedure
Use the following steps to perform the transmit alignment procedure.
Step Action
1. Condition the local VFO to apply a 1000 Hz test tone at the required level and impedance specified on
the CLR. Connect the VFO to the XMT STA jack on the front panel of the CFM.
2. Arrange the TMS for terminated measurement specified on the CLR. Connect the TMS to the XMT
LINE jack on the front panel of the CFM.
3. XMT Attenuator Adjustment
Calculate the required XMT ATN setting by subtracting –16 from the XMT STA equipment level speci-
fied on the CLR. Set the XMT GN switches (located on the front panel) to OFF.
4. Program the required XMT attenuation by setting the XMT ATN switches (located on the front panel)
equal to the attenuation calculated in Step 3 +/–0.05 dB. See Table 4.
5. XMT Gain Adjustment
Calculate the required XMT GN setting by subtracting –16 from the XMT level specified on the CLR.
6. Program the required XMT gain by setting the XMT GN switches (located on the front panel) equal to
the gain calculated in Step 5 +/–0.05 dB. See Table 4.
7. With 2600 Hz tone applied to the RCV line and a busy indicator applied to the E-lead (with options S3
and S4 in the TRK position) or M-lead (with options S3 and S4 in the SIG position), check that the TMS
indicates the level specified on the CLR +/–0.05 dB.
8. Remove the TMS from the XMT line jack of the CFM and request the distant terminal to measure the
1000 Hz test tone.
9. Distant terminal verifies proper level as specified on the CLR.
10. This complete the transmit path alignment procedure. Remove all test connections.
9. TESTING
If trouble is encountered with the operation of the CFM verify that all installer connections have been made in ac-
cordance with Part 6, that all options have been arranged as required in Part 7, and that the alignment proce-
dures in Part 8 have been properly performed. Make certain that the module is making good connection with the
mounting assembly card-edge connector; remove and reinsert the module. If trouble persists, refer to Paragraphs
9.2 through 9.4, and Table 3, to test signal/trunk operation of the CFM.
The following test equipment is required for testing the signal/trunk operation of the CFM.
Wilcom T222 Pulsing Test set or equivalent.
Variable frequency oscillator Hewlett-Packard 204 or equivalent.
AC voltmeter Hewlett-Packard 400FL or equivalent.
Miscellaneous test cords and plugs.
To test transmission levels, apply 1000Hz at the proper TLP on the receive line. Verify that the level on the trans-
mit line is the proper TLP.
To test the pulse correction of the receive channel, pulse the receive line with 2600Hz at 10pps and 50 percent
break. Verify that the E lead is pulsing 2600Hz at 10pps and 55+/–4 percent break.
To test the pulse correction of the transmit channel, pulse the M lead at 10pps and 50 percent break. Verify that
the transmit line is pulsing 2600Hz at 10pps and 55 +/–4 percent break.