Fairhaven RD500 User Manual - 4.3
4[F l a t] 5 M i d 6 P k
4.3
Variable Notch and peak filter.
This filter is provided to eliminate tones caused by adjacent signals (in notch mode),
or it can be used to select C.W. signals in peak mode. The filter frequency is
controlled by the knob marked 'filter'. In order to eliminate an interfering tone, it is
usual to start with the filter set to “peak” so that the frequency of the filter can be set
to the pitch of the tone. Once this has been done select notch and tune the filter or the
tuning wheel carefully until the interfering tone disappears.
VARIABLE FILTER . . .
1 [OFF] 2 NTCH 3 PK
4.4
AGC (Automatic gain control)
The receiver’s A.G.C. response is tailored to give a good response to ssb signals i.e.
a fast attack and a short hold period followed by a fast decay. The timing of the
response is user presettable for each mode. Select the mode (Keys 4 to 6), then select
the required speed (keys 1 to 3) the set-up will be permanently stored when the menu
is left. A slow response is recommended for SYNC modes, a fast response is useful
in AM modes, when tuning or scanning, and in SSB the user can choose a slow
response, which will reduce background noise between pauses in speech. A very fast
response is provided when the receiver is in FM mode to allow the receiver to scan
effectively. Selecting a very slow speed may make the receiver appear insensitive.
AGC Setup menu.
SLOW [1] 2 3 FAST
4 [A M] 5 S S B 6 SYNC
4.5
Noise blanker
The RD500 noise blanker has a separate 455KHz I.F. which amplifies wideband
impulse noise and provides blanking pulses. This system is very effective at reducing
car ignition noise and electrical switching noise. Press SHIFT - Key 5 to see the
status of the noise blanker, pressing Key 5 again will switch the Noise blanker on and
off.