User's Guide
WR-3700 Series User’s Guide
11
If you wish, you can have different squelch thresholds for normal reception and scanning. To
activate this feature, go to Configure - General Options and select Separate squelch for
scanning. The receiver will then accept different squelch thresholds on the front panel, and
in the ‘Scanner - Setup’ dialog box (described later).
Attenuator
The attenuator controls the level of the RF signal entering the receiver front-end. If
a signal is too strong, it may overload the receiver and cause distortion. To combat
this problem, the RF signal can be attenuated by 18 dB by clicking on the Local
button or by pressing the O key.
If the attenuator is active and the signals are too weak, click the DX button or press
the D key to turn the attenuator off.
Stepping
Four stepping modes are available: fixed, auto, memory, and duplex. To select
between fixed, auto and memory stepping, click on the Select button or press the T
key until the desired stepping mode appears. Duplex stepping is activated
separately, as described below.
To step through frequencies, click on the up/down buttons located next to the
frequency readout, or press the Page Up/Page Down keys to step up/down
respectively.
The stepping modes are described below in more detail.
Fixed Stepping
Where stations operate on fixed channels (e.g. AM or FM broadcast band, mobile radio,
CB), it is usually more convenient to change the frequency in steps corresponding to the
channel separation.
You can specify the desired step size for each mode from a minimum equal to the frequency
resolution of the display, up to a maximum of 10 MHz. To enter the step size, either click on
the step display with the mouse, or press the F key; then enter the desired step size and press
Enter (or Escape to cancel the entry). Note that LSB/USB share the same step size.
If you change the mode, the step size will be changed to the size previously entered for that
mode.
Note that all modes retain the frequency to the nearest 1 Hz even though the extra digits
might not be visible. For example if you change from LSB to FMW and back, the actual
frequency is not rounded off, but remains the same. This ensures that accidental mode
changes do not cause the exact current frequency to be lost.
Auto-Stepping
Auto-stepping is an enhanced form of fixed stepping, in which the step size depends on the
receiver frequency. This facility can also automatically set the mode and squelch threshold
according to frequency.