robbe Futaba FP-T2VR "Attack-SR" (Fernsteuerung)

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Inhaltsverzeichnis

Funkfernsteuerung für das Graupner Fluppi

as049.jpg Foto: crawl.ee

Signal

  • Trägerfrequenz: 27 MHz, festgelegt über wechselbaren Quartz:
Channel  Freq   Color
   1    26.995  Brown
   2    27.045  Red
   3    27.095  Orange
   4    27.145  Yellow
   5    27.195  Green
   6    27.255  Blue

Schaltung

Attack-SR.png a1473706-79-T2ER%20Mod.jpg Bild: rcgroups.com

IC

Futaba FP2108T
The FP2108T IC emits a PPM signal on pin 17. This modulates the collector voltage of Q2.
I suspect that pins 8~10 are for additional voltage indicator LEDs.
IC1 – Encoder, Voltage stabilizer, Waveform shaper, Oscillator

The type of oscillator utilized by the transmitter is a Crystal controlled modified Colpitts oscillator.

The following components are used for suppression of spurious radiation 
Audio Low Pass Filter
- IC1 (FP2108T)
- C13 (15nF)

Method of stop modulation
Attach a resistor 4.7KOHM between no.18 and no.19 of FP2108T
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