Birdies; Amateur Shortwave Bands In The Us - Radio Shack DX-398 Owner's Manual

BIRDIES

Birdies are the products of internally generated signals that make some frequencies
difficult or impossible to receive. If you program a birdie frequency, you hear only
noise on that frequency. The most common birdies to watch for on this receiver are:
450 kHz
18,000 kHz
Notes:
• See "Storing SW Frequencies in Memory" on Page 28 for more information
about using the shortwave page 29.
• Interference from devices such as dimmer switches and motors and atmo-
spheric conditions can disrupt shortwave listening. You can minimize interfer-
ence by moving the receiver away from the source of noise, or turning off the
offending device. Shortwave stations sometimes change their operating fre-
quency to avoid interfering with other stations, to improve reception during dif-
ferent seasons, or to take advantage of signal propagation changes due to sun
spots. For this reason, a given station might not be found on the frequency
listed in memory. Reception of these stations can also be affected by rapid
changes in the ionosphere. Sometimes the station you are listening to might
fade out completely. These occurrences are normal shortwave listening condi-
tions.

AMATEUR SHORTWAVE BANDS IN THE US

Amateur radio operators in the U.S.A. are found in the bands listed here. They op-
erate mostly in LSB (Lower Side Band) mode. Morse code operators are generally
found in the lower areas of each band. The amateur radio operators with the most
advanced classification are found in the upper areas of each band.
3,844 kHz 9,000 kHz
20,490 kHz 21,835 kHz
10,250 kHz
21,868 kHz
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