MULTIPLEX on the subject of 2.4 GHz
“2.4 Gigahertz” is a catchword which has been on everyone’s lips - and in all the modelling
media - for quite a while now. Every day we are asked about it, and we now wish to make
our position clear:
Yes and no.
Yes, because this frequency band has never before been available for modelling
purposes, and existing experience with it is not extensive.
No, because this frequency band (ISM - Industrial Scientific Medical - band) is also
approved for digital data transmissions, and is already in widespread use in equipment
such as WLAN systems, Bluetooth devices, cordless telephones, garage door openers
and even by the “microwave” oven, which is to be found in almost every household.
What advantages can 2.4 GHz offer us as modellers?
The advantages are highly interesting - e.g. automatic channel selection, short aerials on
transmitter and receiver, telemetry applications, higher data transmission rates (many
high-resolution control functions). However, since the use of 2.4 GHz is not restricted to
modelling, there is clearly a risk of interference from the numerous other users of this
band, i.e. from non-modelling applications, and this risk is currently very difficult to assess.
Experience with 2.4 GHz radio control systems in the USA has been very promising, but
that experience does not necessarily apply in full to the European market, as the
permissible transmitter power in America is several times higher than that approved for
Europe. As is commonly acknowledged, higher transmitter power offers a clear advantage
in respect of transmission security and range.
And what about the “legal” side?
On 01.07.2008 a change in the European technical regulations is to be implemented, and
it is not yet clear whether the 2.4 GHz products currently being sold will satisfy the new
rules. In some countries discussions are currently in progress concerning the possibility of
a total ban on this band for model flying. Even though the law protects users of “existing
equipment”, i.e. those who have bought such a system will continue to be able to use it,
problems could arise subsequently regarding availability of accessories and replacement
parts; this has already occurred with 434 MHz systems, which are still approved to this
What is MULTIPLEX doing about it?
Of course, as manufacturers of RC equipment we are anxious to respond to the demands
of the market. We are keen to meet our customers’ wishes as well as to help to push
forward with technical developments. At present our view is that it remains to be proved
conclusively whether this technology works reliably, without limitation, under all conditions,
for our specialised use as radio control systems for models. A comprehensive programme
of practical testing needs to be carried out in all situations with all types of model. For all
these reasons we shall not introduce a system to the market until we are confident of
being able to offer our customers mature products exploiting future-proof technology.
MULTIPLEX Modellsport GmbH & Co. KG
P.S. Если коротко: Мы не можем торопиться и выводить на рынок не изученный всесторонне продукты...
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