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RXRL-NV/2 Technical and Maintenance Manual
R.V.R. Elettronica S.r.l. (Bo)
Pag. 26
that the oscillator has locked to the operating frequency displayed.
The display has five digits, 4 before the decimal point representing
(from left to right) thousands of MHz, hundreds of MHz, tens of MHz
and MHz; and 1 after the decimal point representing hundreds of KHz.
To change this number, use the UP (14 Fig.1) and DOWN (12 Fig.1)
buttons to respectively increase it and decrease it.
Once the desired frequency has been found, press ENTER (13 Fig.1)
to confirm and save it.
As soon as the ENTER button has been pressed, the LOCK led will switch
off (providing that the new frequency is different from the old),
indicating that the VCO is re-tuning to the new frequency.
If the ENTER is not pushed, the display will flash the new value
four times and then reset to the previous value.
NOTE: The receiver will continue to function normally at the same frequency,
throughout the procedure described above, until the ENTER button is pressed.
Note that a momentary press of the UP and DOWN buttons will increment
or decrement the right most digit by 1 (corresponding to a frequency
change of 100KHz).
A longer press of either button will cause the display to increment
or decrement continuously until the button is released.
Furthermore, when the limit of the operating frequency band is
reached, the displayed frequency will jump to the other limit and
carry on changing in the direction corresponding to the button being
pushed.
NOTE: The frequency band is pre-defined by the user and rarely exceeds 50 MHZ.
Example: Band 1750-1800 MHz:
UP button pressed:
1799.99 1800.00 1750.00 1750.10
DOWN button pressed: 1750.10 1750.00 1800.00 1799.99
After the PLL has been locked for about 90 seconds, the display turns
off automatically.
To switch it on, press the ENTER button.
6)
Connect an audio analyzer to the MONO (3 Fig.1) or MPX outputs
(6 Fig.1).
Using an R.F. signal generator, inject a carrier at the receiver’s
operating frequency into the R.F. input of the receiver, at a level
of
-47dBm.
Modulate the carrier with a 400Hz tone at a deviation of ±100KHz.
Check that the analog meter (21 Fig.1) displays a reading of 1mV.
7)
Select CENTER with the selector (20 Fig.1) and check that the
received signal is centered.
8)
Deviation meter check.
Set the modulation display gain (20 Fig.1) to 130% f.s.d.
Connect an audio analyzer to the MONO output (3 Fig.1).
Check that the bar-graph display (18 Fig.1) lights up to the first
Summary of Contents for RXRL-NV/2
Page 19: ...RXRL NV 2 Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 19 FIG 1...
Page 21: ...RXRL NV 2 Technical and Maintenance Manual R V R Elettronica S r l Bo Pag 21 FIG 2...
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Page 174: ...RXRL NV 2 ii Appendix Rev 0 3 11 04 03 Pagina lasciata intenzionalmente in bianco...
Page 175: ...RXRL NV 2 1 2 BLOCK DIAGRAM Rev 0 1 12 09 02...
Page 176: ...RXRL NV 2 2 2 BLOCK DIAGRAM Rev 0 1 12 09 02 Pagina lasciata intenzionalmente in bianco...
Page 178: ...RXRL NV 2 2 10 CPU NV Technical Appendix Rev 0 1 02 09 02...
Page 181: ...RXRL NV 2 CPU NV 5 10 Appendice Tecnica Rev 0 1 02 09 02...
Page 187: ...RXRL NV 2 CSSINTPLLRX 1 4 Technical Appendix Rev 0 1 02 09 02...
Page 191: ...RXRL NV 2 CSTCX002 1 4 Technical Appendix Rev 0 1 02 09 02...
Page 196: ...RXRL NV 2 2 2 CSFIL70SAW01 Rev 0 1 12 09 02...
Page 197: ...RXRL NV 2 FLTPB7E 1 4 Appendice Tecnica Rev 0 1 04 03 03...
Page 201: ...RXRL NV 2 CSDECRXLCD01 1 4 Appendice Tecnica Rev 0 1 04 03 03...