TX667 Instruction Manual
3
Original 40 channel wideband radios will continue to operate on the original 40
channels, however they will not be able to converse on the newer channels 41 –
80. The newer narrowband radios will be able to converse with all older 40 channel
wideband radios on all channels 1 – 40 as well as the newer channels allocated
from 41 – 80. The mixing of narrowband and wideband radios in the same
spectrum can cause some possible operating issues of interference and varying
levels of received volume.
Possible Issues
When a new narrowband radio receives a transmission from an older wideband
radio 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
adjacent 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
wideband 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.
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