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Amateur Radio ALE Sounding Guidelines and Information
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Member Store
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Related Link: ALE Channel Frequency List with Pilot and Sounding Channels
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What is Sounding?
In Amateur Radio ALE, a sounding is
simply a 10 second ALE transmission of your callsign (station identification). A
sounding is different from a beacon
because the ALE station uses 2 way communications; and the
ALE sounding transmission is part of a selective calling process for
calling and actively maintaining communication with other stations in
the global ham radio
ALE net and individually. The purpose of a sounding transmission
is to establish communications with other stations in a net.
Why are
Soundings Used?
The communication through soundings enables other
ALE stations to know which frequencies or bands your station is active on. When
you first turn on your transceiver, you can send some soundings so that
other stations will copy your transmissions, and then may selectively
call you on the best channel, using
the minimum
number of call attempts. The scanning ALE receiver listens to the soundings
of
other stations each time they are heard and stores them in memory with
channels
and times.
How Are
Soundings Transmitted?
Soundings can be manually transmitted, or set by the operator to
transmit scheduled soundings
every hour. Usually, if repetitive soundings are set, when the ALE
controller or radio is first turned on then there is a delay of a few
minutes before the first soundings are transmitted.
Ham-Friendly ALE Soundings
In
the ham radio ALE network, there are Pilot Stations in different areas
of the world that send soundings 24/7. This system transmits sounding only on the Pilot Channels in the automatic station sub-bands, and this strategy forms part of the basis of ham-friendly ALE.
ALE Sounding
Guidelines for Amateur Radio
1. As an Amateur Radio Operator, you are responsible for all
transmissions
of your station.
2. Before sending
soundings, or any transmission, listen carefully to all your transmitting channels with your receiver. Avoid
interference.
3. Pay attention to accuracy when setting up your ALE system's sounding parameters.
4. Manual or attended
soundings may be transmitted on any ALE channel, similar to CQ.
5. For repetitive or scheduled sounding, program your ALE to sound only on
the designated Pilot Channels marked PILOT in the Amateur Radio
ALE Channel List, for your IARU/ITU Region, and within your
license. There is one Pilot Channel per ham band in each Region.
6. Program your ALE controller to use TWS
Sound if possible. Using TWS Sound increases the efficiency
of
ALE nets.
7.
The optimum duration of a sounding
transmission is approximately 10 to 15 seconds.
Test and verify your sounding transmission duration with your watch. A
sounding transmission should NEVER be longer than 30 seconds!
8. The optimum repetitive sounding on a channel is about once every 60
minutes. Please DO NOT sound repetitively on a channel more than 2 times per hour.
9. The optimum scan rate is 1 or 2 channels per second. If you scan
more than 10 channels, use 2 channels per second.
10. Check
your transmitter operation and antenna system SWR regularly on every channel in your scan group!
11. Take care in programming your ALE controller
(software) and transceiver. Test it carefully and verify it for proper operation on a
dummy load before connecting your antenna.
12. Use the Polite or Voice Detect or Channel Occupancy Check or Busy Detect feature of your ALE controller.
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