SPC (Supplementary Power Connection) System
Telemetry System
Hitec’s exclusive optional receiver power system allows you to directly power the receiver from the main motor
power battery of an electric powered aircraft. Up to 35 volts can be fed directly into the receiver to power
JUST THE RECEIVER FUNCTION. It will not power the servos. Almost all servos will burn up if more than 6 volts
are used over a short period of time.
The Hitec Spectra 2.4 Module and Optima Series of receivers feature full telemetry capabilities (except Optima
6) and include a Low Receiver Battery Warning as a basic function.
I. Basic Function: Low Onboard Battery Warning - for All Optima Receivers
When the Optima series of receivers is powered up, it will automatically detect the battery voltage level and
recognize between 4-cell or 5-cell NiMH and NiCd batteries (4 cell < 5.8V < 5 cell).
In case a 2-cell LiPo battery is being used, you can customize the battery warning level by using the HPP-22
PC program.
- When the battery level is safe (4 cell > 4.5V, 5 cell > 5.6V), there will be no change to the LED lights.
- When the battery level is low (4 cell < 4.5V, 5 cell < 5.6V), the BLUE LED glows constantly and the RED LED
will blink fast. You will hear three continuous beeps from the module as a low receiver battery warning.
Upon hearing the beeps, we advise you to land at once.
II. Optional Functions:
GPS, FUEL, TEMP, O-RPM, M-RPM, VOLT, Amp Sensors - Applicable for Optima 7 & 9 Only
- More devices will be available in the future. Check the Hitec website at
www.hitecrcd.com
for more
up-to-date information.
SERVO
SERVO
SERVO
SERVO
SERVO
SERVO
Power Battery
Motor
BEC
ESC
BAT/CH7
CH6
DATA
SPC
LED
LED
LINK
LINK
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LINK
CH1
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CH3
CH4
CH5
OPTIMA
OPTIMA
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OPTIMA
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2.4GHz 7 Channel Aircraft Receiver
2.4GHz 7 Channel Aircraft Receiver
2.4GHz 7 Channel Aircraft Receiver
AFHSS
2.4GHz
Telemetric
ADAPTIVE
FREQUENCY HOPPING
SPREAD SPECTRUM
SPC Connection Diagram
- Low Battery Warning function is only for your reference. The actual battery level could be
different. Battery Memory Effects such as Lazy Battery Effect or Battery Memory could affect
the Low Battery Warning function.
- When the 2.4GHz system and HV servos are used together, we strongly recommend using
fully-charged, large capacity battery packs and you must constantly monitor the battery status.
Warning
- Some Hitec servos are rated to be used at 7.4 volts. You will still need to supply power for your
servos with a four or five-cell NiMH receiver battery or a 2-cell Li-Po and regulator set-up.
- The SPC system was partially created to be integrated into future Hitec telemetry system devices.
Check the Hitec website for more information on the availability of telemetry systems in the future.
Note
- If FAIL-SAFE is deactivated, the FAIL-SAFE position settings are also deleted!
- The FAIL-SAFE settings should be checked every time before you run the engine/motor.
Note
FAIL-SAFE and Hold Mode Setup
If the receiver signal somehow becomes interrupted or interference occurs, the servos will move to the pre-set
FAIL-SAFE point you previously stored in the FAIL-SAFE set-up. Make sure you set the FAIL-SAFE function
properly.
If FAIL-SAFE has not been activated, the signal will switch off after the HOLD period of one second. This means
that the servos become “soft” and remain in their last commanded position under no load (this may equate to
full-throttle!), until a valid signal is picked up again.
In the interest of safety, we recommend that the FAIL-SAFE function should always be activated, and the
FAIL-SAFE settings should be selected so as to bring the model to a non-critical situation (e.g. motor idle /
electric motor OFF, control surfaces neutral, airbrakes extended, aero-tow release open, etc.).
Testing the FAIL-SAFE Setting
a. Move the sticks to positions other than the FAIL-SAFE settings and then switch off the transmitter.
The servos should now move to the FAIL-SAFE positions previously stored, after the one second HOLD period.
How to turn FAIL-SAFE Off and reactivate the Hold Mode
a. Switch on the transmitter then the receiver. Wait for the system to boot and you have control over the model.
b. Press and hold the receiver function button for 6 seconds and release. After 2 seconds, the RED and
BLUE LEDs will blink rapidly.
c. Immediately press the button once.
d. FAIL-SAFE Mode is now deactivated and HOLD mode is activated.
e. Turn the transmitter off then the receiver off.
f. Turn the system back on to use it.
Fail-Safe position
Switch on both.
Wait for the system to boot and gain control
over the model.
Press and hold the button on the receiver until the LED turns off
(approx. 6 seconds)
Release the button. After 2 seconds, both RED and BLUE LEDs blink alternately.
The receiver will count 5 seconds, during that time, move all the transmitter
sticks and other controls to the desired FAIL-SAFE positions
(e.g. motor idle, control surfaces neutral). Hold until blinking stops.
When blinking stops, the system will temporarily
remember the FAIL-SAFE position. Turn off
the system to save and exit.
www.hitecrcd.com
Link (ID-Setting)
Too Close: Less than 50Cm(18in)
Too Far: More than 5M(15ft)
- Link must be done within 15ft. (5m) of the transmitter and receiver.
- Transmitter and receiver need to be at least 18in. (50cm) from each other to link properly.
Note
Press and hold the link button on the receiver and turn on the power.
Press and hold the button on the module,
and turn on the transmitter.
Both RED and BLUE LEDs will blink rapidly
to find the transmitter signal.
Release the link button when the
RED LED on the receiver glows steady.
When the link is completed, the BLUE LED on the
module will blink while the BLUE LED on the receiver
glows steady.
Release the link button.
Check if the BLUE LED is blinking.
If the RED LED is blinking, press
the link button for 2 sec., so
that the LED changes to BLUE.
C
C
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Bot
Bot
Release the link button.
When the link is completed, the BLUE LED on the
module will blink while the RED LED on the module
glows steady.
2.4GHz 6 Channel
2.4GHz 6 Channel
Aircraft Receiver
Aircraft Recei
ver
2.4GHz 6 Channel
2.4GHz 6 Cha
nnel
Aircraft Receiver
Aircraft
Receiver
Channel
2.4GHz 6 Cha
nnel
Receiver
Aircraft
Receiver
Check if the RED LED is blinking.
If the BLUE LED is blinking,
press the link button for 2 sec.,
so that the LED changes to RED.
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Non-telemetry RXs (MINIMA & MICRO Series)
Telemetry RXs (OPTIMA Series)
Link (ID-Setup or Bind)
Your Hitec AFHSS system uses a communication protocol that links and binds the Hitec 2.4GHz receiver to
your transmitter. Once the receiver and module are “bound,” no other transmitter can interfere with your
receiver during its operation. In the case of multiple model memory transmitters, you can bind as many Hitec
2.4GHz receivers to your transmitter, one per model memory as necessary.
Each module and receiver set is paired at the factory for your convenience.
Use one of the following binding methods to bind additional Hitec 2.4GHz receivers to your transmitter.
For the receiver, both BLUE & RED LEDs will glow steady.
Note
- The SPC function is applicable to the OPTIMA series of receivers only.
Note
- The telemetry function is applicable for the OPTIMA series of receivers only
2Sec.
6Sec.
When they are turned on again, the RED LED on the
module(or radio) and the BLUE LED on the receiver
will glow steady.
When they are turned on again, you will hear a
continuous beep sound. Both the RED LEDs on the
module and receiver will glow steady
in normal status.
Channel
2.4GHz 6 Cha
nnel
Receiver
Aircraft Receiver
To save the setting, please reboot both the transmitter and receiver.
