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When a beacon is turned on, it performs a self test. If an error is encountered, a message is either displayed on the screen, an indicator
light changes color, or an indicator light stops blinking.
The Pieps DSP (and probably some other transceivers) uses a fourth antenna
to transmit a weak signal during the self test. This approach allows it to test that the other three antennas can receive a signal. However, if you turn on a DSP when it is near
a transmitting beacon or another electrical device, the DSP will often report an error during the self-test because it is receiving a second signal. People sometimes misinterpret
this as a problem with the DSP when in fact, it is indicative of a thorough self-test. To avoid these phantom errors, you should be at least 5 meters from any electrical devices
or transmitting beacons when you turn on your DSP.
The ARVA Evolution+ and the
ARVA Advanced perform self tests every five minutes to check the battery strength, the transmitting frequency,
the transmitting power, etc. If a problem is detected the ARVAs will emit three long beeps every five minutes.
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