Service manual

17VX-4500/-4600 Series UHF FM Transceiver Service Manual
Alignment
Please adjust the following items when needed.
Modulation Balance <Wide> / <Narrow> (This Alignment is difficult.)
This parameter is to align the “Modulation Balance” (Wide/Narrow).
1. Press the “Mod Bal (W/N)” button to start the alignment.
2. The Modulation Balance Alignment window will appear.
3. Connect the AF Signal Generator to pin 1 of the D-SUB
connector on the rear panel of the transceiver. Then set the
AF Signal Generator output level to –24 dBm at 3 kHz tone
(Sine Wave).
4. Set the “Data” box value to “160” on the desired channel
by following method:
 Dragging the slide bar of the desired channel
 Pressing the Up / Down arrow key of the desired chan-
nel
 Entering the value directly in the “Data” box on the se-
lected channel
5. Click the “PTT” button or press the “SPACE” bar the radio
starts to transmit on the selected channel.
6. Write down the measured deviation level.
7. Change the AF Signal Generator frequency to 40 Hz tone
(Sine Wave, –24 dBm).
8. Set the value to get “deviation of step 6” by following meth-
od:
 Dragging the slide bar of the desired channel
 Pressing the Up / Down arrow key of the desired chan-
nel
 Entering the value directly in the “Data” box on the se-
lected channel
9. After setting the deviation level click the “PTT” button or
press the “SPACE” bar to stop transmitting.
10. Click the “OK” button to finish the Modulation Balance
alignment and save the data.
ADJ Type
Basic: “Low-edge / band center / high-edge“ and se-
lect the channel for alignment (Default).
Single: Alignment value changes only on the selected
channel.
All Freq: Alignment value changes on all channels.
«