CHAPTER I. EQUIPMENT SELECTION
A. Channels/Frequencies and Frequency Bands
How do I change the frequency of my transmitter?
Using a single-frequency module: To change the frequency when using a TK-FM non-synthesized
module, with the transmitter off, remove the module and replace it with a module on the desired
channel. (Note that you can even change transmitter “bands”, for example from 72mHz to 50mHz.)
All radio frequency circuitry is in the module so there is no need to “retune” after a module change.
Using a synthesized module: To change the frequency when using a TK-FSS synthesized module, first
follow your flying site’s procedures to have exclusive use of your desired channel, then turn the
transmitter on while holding down the A or R key (so the radio does not transmit on its current
channel.) Notice the “ON AIR” message normally under Futaba is replaced with “Radio Control
Systems”. The 9Z is not transmitting and will not transmit again until you turn the power off and
back on.
How do I change the frequency of my receiver?
Using a single-frequency receiver: When using a non-synthesized receiver on 72mHz, the channel can
USUALLY be changed within certain groupings without requiring retuning of the receiver. Any
Futaba receiver purchased on 11-35 (“low band”), can be used on any other channel within that band
by changing crystals and properly range checking the radio system. Any Futaba receiver purchased
on 36-60 (“high band”) can similarly have a crystal change. Always fully range check your radio
equipment after a crystal change, and if identical or improved range is not verified, DO NOT FLY.
Send the transmitter and receiver to the Futaba service center for testing and tuning.
Using a synthesized receiver: To set the frequency on the R309DPS synthesized receiver, unplug the
receiver battery. Open the receiver’s dust cover. Adjust the left switch for the first digit of the desired
channel and the right switch for the last digit of the desired channel. Close the dust cover. Plug in the
receiver battery. For more information see p.36 of the manual.
Can I use my 9Z on a different frequency BAND than it currently uses? Can I go to 75mHz for
ground use for Battlebots
®
, boats or cars? If I have a HAM license, can I use the radio on 50mHz?
The real plus of using a modular radio is that you can purchase a module and receiver on any
frequency for the band legal for your intended use and use it safely and without any loss of
performance. For example, you can purchase the TK modules on 50mHz, and we can convert TK
modules and most receivers to 75mHz. Please contact the Futaba Service Center for further
information.
Desired Result
Process
Keystrokes
Turn On Without Transmitting
Hold A or R during power on
Open Frequency (FRQ)
Q C I
Select the Desired Frequency
(use R & Q to page through)
Use Set to Confirm and Close
O N R
Cycle the Transmitter
N R (power off, power on)
Power up without transmitting,
then select the desired
frequency and cycle the
transmitter to transmit on the
new frequency.
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