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User Manual
Rev. 1.0- 29/11/05
PTRL NV/3 & RXRL NV/3
The signal from IC7b is de-emphasized by the programmable deemphasis assembly
built around IC6 and IC7a and then filtered above 15kHz to extract a clean mono
signal from the multiplex signal. The signal from the IC7d output is applied to the
mono output balanced buffer IC9. IC7c is the buffer for the BF mono output; hardware
jumper BD1 is used to select which signal - among the broadband modulated, multiplex
filtered or mono signals - is to be applied to IC7.
Shift-register circuit IC5 provides the interface between the serial command from the
CPU and the programmable switches of the board. The circuit around IC10 acts as
an amplifier for low-level signals to enable measurement, IC12 is the RS232 interface,
whereas TR1-TR3 provide interfacing with the parallel remote control output. Lastly,
TR4 controls field relay RL1 based on CPU commands.
8.2.3 RF Input Filter
On radio links in the 1400 ÷ 2600 range, the input filter is a separate module
accommodated on the inside of the unit back panel.
According with its rating, this filter determines receiver sensitivity and off-band spurious
noise rejection. This filter is a superior quality component and may only be calibrated
using suitable microwave equipment.
Do not alter its calibration unless you have such equipment available. The filter is
centred on the receiver band set at the factory and is broad enough to cover the
whole band, while providing good attenuation of reception image frequency.
Shown below is the typical chart for standard filters for two ranges at production
extremes. Filters with smaller bands are available as an option.
-80,00
-70,00
-60,00
-50,00
-40,00
-30,00
-20,00
-10,00
0,00
1.465
1.545
1.625
1.705
1.785
1.86
)UHTXHQ]D0+]
/R
VV
G%
Response of standard internal filters for the 1660 ÷ 1670 MHz and 2440 ÷ 2483 MHz ranges.
Summary of Contents for PTRL NV/3
Page 1: ...PTRL NV 3 RXRL NV 3 User Manual Volume 1 Manufactured by Italy...
Page 4: ...PTRL NV 3 RXRL NV 3 ii User Manual Rev 1 0 29 11 05 This page was intentionally left blank...
Page 8: ...4 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 This page was intentionally left blank...
Page 55: ...51 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 Ensemble View 10 1 PTRL NV 3...
Page 56: ...52 52 User Manual Rev 1 0 29 11 05 PTRL NV 3 RXRL NV 3 10 2 RXRL NV 3...