ZETRON 640 DAPT XTRA, Installation And Repair Manual, Page: 106 / 210

Adjustment Procedures
94 025-9416
RX TONE VOICE
ADJUST
Figure 56. Rear View of Model 640 Chassis
q 4. Call the pager again.
q
5. During the recording time, speak a test voice message.
q 6. Use the radio service monitor to measure the RF deviation of the voice transmission.
While the page is being sent, check the deviation again to ensure that it is about 4.5
kHz during the peak voice levels.
q 7. Hang up or press pound (#) to terminate recording.
The VOICE audio adjustment is complete.
TONE Audio Adjustment
Follow the steps below to perform the TONE audio adjustment:
q 1. Call the first 2-tone test pager defined in Figure 54. The Model 640 responds with 3
short beeps to indicate the start of voice message recording.
q
2. Immediately hang up to terminate recording.
Note: The EmptyMsg field in the Class of Service must be set to Y for this adjustment to
work. Otherwise a hang-up cannot initiate a page.
q 3. Use the radio service monitor to measure the RF deviation of the transmission. While
the tones are playing, adjust the TONE pot on the rear panel of the paging terminal
for about 3.0 - 4.0 kHz deviation.
q 4. Make sure that the deviation level does not vary when the paging tones change from
500 Hz to 1000 Hz.
q
5. Repeat steps #1 - #3 using the second 2-tone test pager (1000 Hz and 2000 Hz).
q 6. Ensure that the deviation level is consistent for each of the paging tones.