SST DM-20 User Manual - Radio Range and Channels
15
Microphone Mix DM-20
Radio Range and Channels
The transmitter and receiver have built-in antennas. The
radio range between the units is around 30 metres. This
may however vary depending on the particular environ-
ment you are in. Like all radio systems, Comfort Digisys-
tem communicates on specific channels. If you use two
transmitters on the same channel or a neighbouring one,
there may be interference. Other electronic equipment
can also interfere with radio transmissions.
In most European countries, channels 1-3 (863.250 –
864.750 MHz) may be used for hearing products. How-
ever, you should always check with the frequency assign-
ment authority in your own country which channels are
free and which require a licence.
In addition to channels 1-3, under Extended there are
several channels in bands A-F, which require a licence in
most European countries:
A 768 - 785 MHz
B 854 - 863 MHz
E 853 - 854 MHz
F 865 - 872 MHz
When using the built-in receiver, the choice of frequency
for the receiver or transmitter is restricted as shown in
the
Built-in receiver
section.