M3SR Series 4100
Switching the Rx Preamplifier On and Off
3.142
Operating Manual 6175.4760.02 – 01
3.7.2.7
Switching the Rx Preamplifier On and Off
Softkey
Softkey Type
Description
Toggle
1.
Press softkey 'Preamp' to toggle preampli-
fier on/off.
Possible values:
•
ON
•
OFF
Default value:
ON
It is recommended to keep the preamplifier on
when the radio is operated on short, low-gain
antennas or at frequencies above 10 MHz,
where it can increase the signal-to-noise ratio
of the received signal.
In other cases, operation with Rx preamplifier
switched off can deliver even better reception
results.
Superimposed over these manual settings is
an automatic process (in case AGC function is
switched on) which controls the preamplifier
gain depending on received signal strength to
prevent saturation of subsequent stages. The
manual settings are limits up to which the au-
tomatic process controls, i.e. for low signals
the attenuation /gain values apply; if the signal
is above a threshold it is further attenuated.
Summary of Contents for M3SR 4100 Series
Page 15: ...M3SR Series 4100 Documentation Overview xiv Operating Manual 6175 4760 02 01...
Page 48: ...M3SR Series 4100 Index 34 Operating Manual 6175 4760 02 01 ZF4401 mod 02 2 10...
Page 70: ...M3SR Series 4100 Radio Control 1 22 Operating Manual 6175 4760 02 01...
Page 116: ...M3SR Series 4100 Example Configuration 2 46 Operating Manual 6175 4760 02 01...
Page 336: ...M3SR Series 4100 Priority Channel 3 220 Operating Manual 6175 4760 02 01...
Page 696: ...M3SR Series 4100 Remote Control 8 4 Operating Manual 6175 4760 02 01...
Page 697: ...Operating Manual 6175 4760 02 01 9 1 M3SR Series 4100 Drawings 9 Drawings...
Page 706: ...M3SR Series 4100 Drawings 9 10 Operating Manual 6175 4760 02 01...
