A GENERAL GUIDE TO SCANNING
BIRDIES
Birdies are the products
of
internally generated signals that
make some frequencies difficult or impossible to receive. If
you program one of these frequencies, you hear only noise
on that frequency.
If the interference
is
not severe, you might be able to turn
SQUELCH clockwise
to
cut out the birdie. The most com-
mon birdies
to
watch out for are listed below.
Birdie Frequencies
44.360MHz
208.oo0MHz
767.4OOMHz
953.250MHz 1232.600MHz
48.045
220.750
769.800
1015.000
1240.250
59.500
244.250
803.550
1017.500 1243.050
70.235 249.750
805.950
1026.000
1245.850
70.085 250.500
815.600
1052.750
1248.650
73.930
278.4375 818.000
1088.875 1258.500
76.770 279.1875
819.750
1098.250 1260.000
79.435
298.0625
822.250
1104.250 1262.750
79.800 298.8125
851.875
1107.000
1265.500
80.520 309.800
854.375
1109.750
1272.350
83.170 310.600
856.875
1112.500
1275.150
84.260 327.500
867.9375
1163.6875 1277.950
85.020 342.000
900.0625
1166.4375
1280.750
86.865 342.800
902.5625
1169.1875 1288.400
122.375
366.000
905.0625
1203.3125
1291
.200
122.875
366.750
916.125
1206.0625 1294.400
130.9375 464.250
918.625
1208.8125
1296.800
144.135 465.250
921
.125
1224.200
155.125 488.375
948.250
1227.000
203.500 501.4375
950.750
1229.800
26
CROSS MODULATION
When using
an
external antenna, a strong frequency close
to
the reception frequency might cause cross modulation
(like cross talk). Set the
An
switch on the back panel to
-10
dB to minimize cross modulation.
RECEPTION NOTES
Reception on the frequencies covered by your scanner
is
mainly "line of sight." That means you usually cannot hear
stations
at
your listening location that are located beyond
the horizon.
During summer months, you might
be
able to hear stations
in
the
30-50
MHz range located several hundred or
even
thousands of miles away. This
is
due to summer atmo-
spheric conditions. This type or reception
is
unpredictable,
but often very interesting!
One very useful service
is
the National Weather Service's
continuous weather broadcasts. These broadcasts contain
weather forecasts and data for the area around the station,
plus bulletins on any threatening weather conditions.
These stations use three frequencies:
162.40, 162.475, and
162.55 MHz. In most areas of the country, you can receive
one of these frequencies.
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