|
Introduction to DXing
by Mika
Mäkeläinen
DXing means listening to far-away
- usually foreign - radio stations. Listening
to your regular hometown station is not DXing, but
listening to a similar station thousands of kilometers
away, outside the normal coverage area, is DXing.
"D" is said to mean distance
and "X" refers to the unknown. DXers -
hobbyists who enjoy DXing - try to pick up radio
stations, which normally would not be audible at
such a distance. Most DXers concentrate on broadcasting
stations. This refers to stations, which are meant
to be listened to by the general public. Radio waves
are also used by various utility
stations from cellphone companies to sea and air
traffic as well as the military, and some DXers
enjoy hunting these signals as well.
 |
| Advanced hobbyists often buy
a communications receiver specifically designed
for the hobby, but these are fairly expensive.
A beginner can start with any receiver which
has shortwave bands (all or parts of the frequency
range 3-30 MHz) and a digital frequency display. |
DXers should not be confused with
radio amateurs - also known as ham operators. Unlike
a ham operator, a DXer doesn't transmit anything
himself and doesn't therefore need any license.
DXers don't need to know about electronics, radio
technology nor about telegraphy, but as a hobby
DXing can be equally challenging.
The challenge lies in picking
up radio signals at an incredible distance. In other
parts of the world there are still hundreds of radio
stations, which no one on your continent has heard,
but which could be picked up at your location under
ideal conditions - by an experienced DXer, who knows
what, where and when to hunt.
Night time
is the right time
If you only listen to FM
stations, you know that the same stations can
be heard day after day. The FM radio signal radiates
directly from the transmitter antenna to all directions.
Because the earth is round, and the signal doesn't
bend, FM radio stations are normally not heard much
beyond the horizon. Under exceptional circumstances
even an FM signal can bounce back from the atmosphere,
and these kind of special reception conditions are
what FM DXers are after.
 |
| Compare the mediumwave (AM)
band in daytime and in nighttime - you will
hear how the band if full of distant signals
at night. |
Most DXers however are interested
in AM (mediumwave)
and shortwave
stations. If you have listened to the AM band, you
know that more stations can be heard during the
night than during the day. This is because at night
a certain layer in the ionosphere
(which is part of the atmosphere) reflects signals
back to the earth. Sunlight dissolves this layer,
which reappears after dusk. Therefore long distance
AM reception is possible only when both the transmitter
and the receiver - and the path
in between - fall under darkness.
Radio propagation on most shortwave
frequencies
is rather similar. Therefore, around sunset, DXers
are eagerly trying to hunt for signals coming from
the east. Likewise, sunrise is the best time to
hear stations from the west. At these times, interfering
stations from other directions are not quite as
strong as for example around midnight, when stations
from all possible directions are heard and when
they can cause interference to each other.
Reception conditions change constantly
due to a variety of factors, some of which are very
unpredictable. Therefore, scoring rare catches requires
constant monitoring of the stations audible.
Send a reception
report...
DXers use special equipment to monitor
the airwaves. The so-called communications receivers
are specifically designed for semi-professional
listeners. An expensive receiver is however useless
without a good antenna. Most DXers use antennas
made of copper wire, which is hung on trees or poles
outside.
After hearing an interesting station,
DXers try to identify the station in question. This
is often difficult because of poor reception quality.
The station may also be transmitting in a language,
which the DXer doesn't understand. Over the years
DXers develep elementary skills in a wide range
of languages and at least learn to recognize different
languages, styles of music and identification patterns.
Handbooks (especially World
Radio TV Handbook), DXers' magazines and websites
like DXing.info help in planning what frequencies
and when to listen to.
For future reference, all interesting
signals are recorded. By reviewing notes and recordings
made at the time of listening, many DXers compile
reception
reports, which they send to the station
by mail - or nowadays even e-mail. A reception report
basically includes all the details of what, where,
when and how the station was heard by the distant
listener. Written program details or a cassette
recording should be enclosed as proof of having
heard the station. In the report, DXers request
a confirmation in return - a letter or a "QSL"
card from the station verifying that the signal
was indeed theirs.
In the past reception reports used
to be valuable feedback for international broadcasters,
but nowadays when monitoring reception quality is
in many causes automated and more professional,
many stations find themselves inundated with letters
that are not much use, and reply just out of courtesy.
... and hope
for a reply
 |
| Traditionally QSLs have been
in the form of cards like the above from the
Mexican station XERED (1110 kHz), but nowadays
letters and emails are more common. |
DXers collect these verifications
- known as QSLs - as mementos of their discoveries
on the dial, and also to demonstrate how many stations
they have been able to pick up. Even though QSLs
can't be considered as definite evidence of hearing
a station - as some stations routinely confirm even
insufficient reports and other stations hardly ever
reply to any reports - collecting QSLs remains a
major pursuit for many DXers. Competitions between
DXers are usually based on the number of QSLs received.
On DXing.info you can get
a taste of many different aspects of DXing; read
inside accounts on hunting elusive rarities on DX-expeditions
(DXpeditions), listen to audio
samples of distant radio stations, view images of
some verifications
received and browse articles
on DXing or profiles
of radio stations. Enjoy the site - but don't forget
to switch your radio on, and discover for yourself,
what surprising signals the airwaves may bring your
way tonight!
 
|