Motorola HT 1000 service manual Compensation, Appendix a . Secure Deviation

	with the additional tuning for secure TX deviation and secure RX
	discriminator level tuning.
Transmit Deviation Balance	When tuning with a secure board installed, the coupling capacitor
(Compensation)	inside the RKN4035A Test Cable will cause rolloff of the low port
	modulation. To fix this, the cable should be dc coupled (“VOL”
	position) and an external coupling capacitor (1.3µF or larger) must be
	placed in series with the signal source input to the AC/DC MTR.
	Follow the “Transmit Deviation Balance (Compensation)”
	procedure outlined in Section 5, except change step 3 as follows:
	3.	Set the RTX4005B Test Box meter selector switch to the “VOL”
		position, and connect the signal source to the AC/DC MTR port
		thru a 1.3µF capacitor. Inject an 80 Hz tone at 100mVrms thru this
		capacitor. Keep the ac voltmeter in parallel to the AC/DC MTR
		input to ensure the proper input signal level.
Secure TX Deviation	Transmit deviation balance (compensation) and transmit deviation
	limit adjustments should be completed before secure deviation is
	adjusted. Remember to use the new transmit deviation balance
	procedure outlined in the previous paragraphs before performing the
	following steps.
	1.	From the SERVICE menu, press F2 to select TRANSMITTER
		alignment.
	2.	Press F8 to select the SECURE TX DEV softpot.
	3.	Press F6 to key the radio on the test frequency. The screen will
		indicate that the radio is transmitting.
	4.	Measure the secure deviation on your service monitor.
	5.	Use the up/down arrow keys to adjust the secure deviation per
		Appendix Table 3.

Secure RX Discriminator Level

Appendix A Table 3. Secure Deviation

Channel Spacing (kHz)	Secure Deviation (kHz)
25 / 30	2.91 - 3.06
20 (VHF / UHF)	1.69 - 1.84
20 (821 - 824, 866 - 969)	1.69 - 1.84
12.5	N / A

6.Press F6 to dekey the radio. Press F8 to program the softpot value.

7.Press F10 to return to the TRANSMITTER menu.

8.Set the RTX4005B Test Box meter selector switch to the “MX DISC” position, and connect an ac volt-meter (capable of 1mV resolution on a 2V scale) to the test box AC/DC meter port.

9.From the SERVICE menu, press F3 to select RECEIVER alignment.

10.Press F8 to select the SECURE DISCRIMINATOR LEVEL softpot. The screen will indicate the receive test frequency to be used.

11.Set the RF test generator to the receive test frequency. Set the RF

Appendix A- 7