Motorola VRS750, Service Manual

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4. Press PTT Toggle to dekey the radio, go to the next frequency
point by selecting the slider, typing in the edit control box (press
ENTER to confirm selection) or toggling the softpot value using
the spin control.
5. Press PTT Toggle again to key up the radio at the selected
frequency point.
6. Repeat steps 3-5 for (F2-F7).
7. Press Program to store the softpot values into the radio’s
codeplug.
8. Exit the Transmit Low Power function. The mobile will reset upon
exiting.
Squelch Tuning
Under Rx Align , select Squelch Attn . Select either Squelch Attn. 12.5
kHz , Squelch Attn. 20 kHz , or Squelch Attn. 25 kHz Channel
Spacing variations (see Figure 15).
1. Apply an RF signal modulated with 1 kHz tone at 60% rated
deviation (see Table 10 in Chapter 7) for current frequency point
(F1 being the first) of -110 dBm. Make sure that the mobile mic is
off HUB and the VRS is programmed for ICM BOTH mode so that
the audio will be routed to the mobile speaker.
NOTE: The -110 dBm squelch level was chosen so that each
VRS750 would have the same squelch performance as
other VRS750 units as well as VRS-EP units. This
prevents one unit from receiving a signal that the
other cannot.
2. Set softpot to its maximum value to mute the radio. If the VRS750
remains totally unmute at this setting, leave it at the maximum
setting and continue to step 4.
3. Adjust the softpot value by using the slider, keying in the edit box
(press ENTER to confirm selection), or using the spin controls.
Figure 15. Squelch Attenuation Window in the Global Tuner