Vx-350 Series Vhf Band Service Manual - Vertex Standard VX-350 Series Service Manual

1. PLL VCV ( RX VCO / TX VCO )
This parameter is to align the VCO VCV adjustment.
1. Connect the DC voltmeter between TP1038 on the Main
Unit and ground.
2. Set the transceiver to Low Band Edge frequency.
3. Press the "START" button of "RX VCO" to start the align-
ment.
4. Set the value to get desired VCV 0.9 ~ 1.3 V on the DC
voltmeter by left/right arrow key, drag the slide bar by mouse,
or direct number input.
5. Set the transceiver to Band Center frequency.
6. Confirm that the voltage is VCV 2.0 ~ 2.6 V.
7. Set the transceiver to High Band Edge frequency.
8. Confirm that the voltage is VCV 3.3 ~ 3.9 V.
9. Press the "OK" button after getting the desired VCV to save
the re-aligned value, the alignment of the RX VCO VCV is
accomplished.
10. Set the transceiver to High Band Edge frequency.
11. Press the "START" button of "TX VCO" to start the align-
ment.
12. Set the value to get desired VCV 3.5 ~ 4.0 V on the DC
voltmeter by left/right arrow key, drag the slide bar by mouse,
or direct number input.
13. Set the transceiver to Band Center frequency.
14. Confirm that the voltage is VCV 2.1 ~ 2.7 V.
15. Set the transceiver to Low Band Edge frequency.
16. Confirm that the voltage is VCV 0.9 ~ 1.5 V.
17. Press the "OK" button after getting the desired VCV to save
there-aligned value, the alignment of the TX VCO VCV is
accomplished.
2. PLL R F
EFERENCE
This parameter is to align the reference frequency for PLL.
1. Set the transceiver to Band Center frequency.
2. Press the "START" button to start the alignment then the
radio will transmit on the Band Center frequency. It will
appear the Frequency Alignment window.
3. Adjust the frequency counter displays the Band Center fre-
quency ±100 Hz by left/right arrow key, drag the slide bar
by mouse, or direct number input.
4. Press the "OK" button on the alignment window to save the
re-aligned value, the alignment of the PLL Reference Fre-
quency.

VX-350 Series VHF Band Service Manual

( F
REQUENCY REQUENCY
)
Alignment
TP1038 (MAIN Unit: Lot. 1~11)
TP2038 (MAIN-2 Unit: Lot. 12~)
TP3038 (MAIN-3 Unit: Lot. 62~)
10