Emergency Channels - Vertex Standard VX-4600CB Operating Manual

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mportant nformatIon oncernIng adIo
Possible Issues
When a new narrowband radio receives a transmission from an older wideband ra-
dio the speech may sound loud and distorted - simply adjust your radio volume for
best performance.
When an older wideband radio receives a signal from a new narrowband radio, the
speech may sound quiet - simply adjust your radio volume for best performance.
Depending on how close your receiving radio is to another transmitting radio,
there can be interference from the transmitting radio if it is using a channel adja-
cent to the channel you are listening to.
Simply try going up or down a few channels from the currently selected channel.
The above situations are not a fault of the radio but a symptom of operating wide-
band and narrowband radios in the same bandwidth.
This possible interference will decrease over time as the population of wideband
radios ages and decreases.
Further information and updates are available from the Australian communications
and media Authority (ACMA) at www.acma.gov.au and the Ministry of Economic
Development (MED), radio spectrum management at: www.rsm.govt.nz

Emergency Channels

The ACMA has allocated channels 5/35 for emergency use only. Channel 5 is the
primary simplex Emergency channel. Where a channel 5 repeater is available, you
should select Duplex on CH 5.
Note: Channel 35 is the input channel for the channel 5 repeater therefore channel
35 should also not be used for anything other than emergency transmissions.
Telemetry Channels
ACMA regulations have allocated channels 22 and 23 for telemetry only applica-
tions and have prohibited the transmission of speech on these channels. Conse-
quently your radio has a transmit inhibit applied to channels 22 and 23.
In the event additional telemetry/telecommand channels are approved by the
ACMA, these channels shall be added to those currently listed where voice trans-
mission is inhibited. Currently transmissions on channels 61, 62 and 63 are also
inhibited and these channels are reserved for future allocation.
VX-4600CB O M 3
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