GB Double Sound Speed Controller SFR-1-D
01.03.2020 BEIER-Electronic 17
Setup with differential via Prop #2:
1. Connect throttle channel X2/1, differential channel X2/2 and all proportional
channels you are using.
2. All channels and their trim must be in neutral position on your radio. Switch on
transmitter first and then the SFR-1-D.
3. Switch on power supply at the speed controller.
4. Activate the setup, with the blue button on the SFR-1-D board, until the green
LED flashes fast. The blue LED flashes once.
5. With correct signals at throttle channel X2/1 and X2/2, all neutral positions are
evaluated and stored. In case the red LED is flashing, the SFR-1-D can not
detect a correct signal at X2/1 or X2/2. Please check all connections and start
the complete setup again.
6. Press the throttle stick to full throttle briefly and return to neutral position. Wait
until the blue LED flashes two times and lights permanently.
7. Within 20 seconds press the throttle stick down and give full throttle
backwards and return to neutral position. The blue LED flashes three times
and switches off afterward. The green and red LED are flashing fast.
8. Bring channel X2/2 to maximum and return to neutral. The blue LED flashes
four times and stays on afterwards.
9. Within 20 seconds bring the differential channel X2/2 to minimum and return
to neutral. The blue LED flashes five times and stays on afterwards.
10. The green LED stays on and the setup is completed.
Loudspeaker
You can connect every loudspeaker to the SFR-1-D with an impedance of at least 4
Ω and the maximal power you are using. We recommend full range loudspeakers
with 4 or 8 Ω. Higher impedances are also possible, but the volume decreases with
higher impedances.
The maximum power of the loudspeaker and thus the volume of the SFR-1-D,
correlates with the supply voltage.
To reach a good level of volume and sound quality, install the loudspeaker in a
suitable resonant body (loudspeaker box). A loudspeaker, which lies only on the
table, never reaches optimum sound quality.
Always pay attention to a good air circulation to prevent overheating at the amplifier.
Especially with higher voltages (e.g. above 9,6 V) it might be neccessary to use
active cooling of the SFR-1-D with a little fan.
For more power, it is possible to connect an additional amplifier. A RCA line level
converter (high/low) with galvanic separation (used at car radios) and a small
capacitor (10 nF) must be connected to the input of the SFR-1-D amplifier.
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