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8. Select the Hear Clear RATED AUDIO softpot, and adjust the UP/
DOWN arrow keys to obtain rated audio (3.74 Vrms) into a speaker
(28 ohms) or equivalent resistive load.
9. Press F8 to program the softpot value.
10.Press F10 to return to the RECEIVER menu.
Squelch
NOTE: Verify that audio output is set to rated audio
(3.74 Vrms)
1. Select the 25kHZ squelch tuning menu. (note: 25 kHZ must be
tuned before tuning either 12.5kHZ or 20kHZ squelch).
2. With no signal applied, decrease the softpot value until squelch
opens. Set the RF test generator to the frequency plus the
following offset; (VHF: +200HZ), (UHF: +200HZ), (800MHZ:
+500HZ). Adjust the generator for 8 to 10 dB Sinad.
3. Increase the softpot until the squelch closes.
4. Monitor for squelch chatter. If chatter is present, increase the
softpot until no chatter is detected. Press F8 to program the softpot
value. Press ENTER to select the next softpot adjustment.
5. Repeat step 2 through 4 for all test frequencies shown on the
screen.
6. If you are using 25kHZ channel spacing, skip to step 8. Otherwise,
go into the 12.5kHZ or 20kHZ squelch tuning menus.
7. Repeat steps 2 through 5.
8. Press F10, then F10 again to return to the service menu.
Transmitter Power
VHF and UHF radios require two power-level adjustments, a high-
power or rated-power adjustment, and a low-power adjustment. The
low power adjustment is required since the radio may be used in a
reduced power mode, or with a vehicular adapter.
NOTE:
All power measurements are to be made at the
antenna port.
1. From the SERVICE menu, press F2 to select TRANSMITTER
alignment.
2. Press F3 to select the TRANSMIT POWER softpot. The screen will
indicate the transmit test frequencies to be used.
3. Begin with the highest test frequency shown.
4. Press F6 to key the radio, and use the UP/DOWN arrow keys to
adjust the transmit power per the value shown in Table 15.
5. Press F6 to dekey the radio, and then press F8 to program the
value.
6. Repeat steps 4 and 5 for the remaining test frequencies.
7. Press F10, then F2 to return to the TRANSMIT menu.
Summary of Contents for SYMBOL MT2000 Series
Page 1: ...HT 1000 JT 1000 MT 2000 MTS 2000 and MTX Series Handie Talkie Portable Radios Service Manual ...
Page 2: ......
Page 24: ...2 Notes ...
Page 78: ...56 Notes ...
Page 147: ...Appendix A 9 Appendix Figure 2 Secure Module Location Detail ...
Page 169: ......
