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1) Principle
2) Lead & PPM-inverter
3) Connections
4) Futaba
5) Graupner
6) Conclusions
7) Examples

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5. GRAUPNER connections for the clever ones who did not yet buy a buddy box :

The person that send me an E-mail on the 25th of september 2008 with a solution
for connecting a Graupner to an EVO-12, please contact me again; your E-mail was accidently deleted by my anti-spam filter

Read the previous chapters before starting this one !!!

You better bought a radio where the buddy box is standard from factory...if you knew...

You where gullible once, don't show you would be cheated twice by buying a buddy box when it is not necessary...

Apparently Futaba and Graupner (and Robbe, before being associated to Futaba) are the only brand not to equip systematically from factory all transmitters with a buddy box. Business is tough...

The original Graupner buddy-box system accessories required is a real head-breaker. Therefor I made an overview of the required parts with Graupner ref.numbers, see here : Graupner-overview

I have no information regarding the buddy box interface that transforms the electrical signal into an optical signal. I know, however that, just like with other brands, it is not really necessary to use this optical system.

But on this website www.radiobastler.de you will find everything for the manufacturing of an optical interface. But even with my knowledge of German, I understand nothing of it (lack of electronic knowledge).

I still advise you to use the mono jack 3.5mm connectors, male and female, they are very practical.

The Graupner FM 314 : (negative PPM modulation)

Two versions of this radio exists, the outer being identical , the inner parts are different. This cheap radio when found in second hand is very suitable for use as pupil-TX with a Futaba master : the connectors of the 4 main channels can be easily interchanged and therefore being perfectly compatible.

Version 1 of the FM314(fig. 5-01) :
In the middle of the printed circuit with the electronic components you will find a male connector with 3 contacts.

The cover of the transmitter being removed, the aerial pointed opposite your body and viewing inside your transmitter, you'll find the OUT-signal on the left, the Ground in the middle, the +V on the right (fig. 5-01). It is easy to use a red BEC/ESC-connector that suits perfectly or a servo connector from which the right wire is removed. No IN-connection has been looked after.

Version 2 of the FM314 (fig. 5-02) :


The Ground and PPM OUT are to be found on a connector on the printed circuit board right from the connectors of the main channels 1 to 7.Use 2 servo connectors or BEC/ESC-connectors to connect the necessary signal.

The Graupner FM4014 :

This cheap radio when found in second hand is very suitable for use as pupil-TX with a Futaba master : the connectors of the 4 main channels can be easily interchanged and therefore being perfectly compatible.
Moreover you have the choice between a PPM OUT connection with positive or negative PPM-modulation (see Fig. 5-03)

The Graupner MC10 and MC12: (positive PPM modulation)

On the printboard, between both sticks, you will find a male horizontal connector with 5 contacts in line, pointed to the right for the MC10, pointed downwards for the MC12. Under the contacts following marks are fitted : "GND/BN", "VCC/R", "MOD/OR".
The connections as shown in fig. 5-04 can be done with 2 BEC/ESC-connectors (Futaba ref. F1410, Protech ref. PL 030) from which only one wire is used, or by means of a servo connector.



The Graupner MC 14 and MC 15

Connection for pupil :

See fig. 5-05. You can choose for a positive or negative PPM modulation.

The cover of the transmitter being removed, the aerial pointed opposite your body, this is the view inside the transmitter.
A BEC/ESC-connector or a servo connector with only 2 wires used will be perfect to connect the Ground and OUT to the female mono jack 3.5 mm.

Connection for Master : (negative PPM modulation)

This is how to transform the MC14-MC15 as a teacher's transmitter (fig.5-06).

A BEC/ESC-connector or a servo-plug from which only one of the three wires are used is perfect to connect the Ground to the female jack mono 3.5 mm.

Probably the same can be done on all radios that can be equipped with the master-module ref. 3290 (D14-FM414-FM4014-FM6014-MC14-MC15-MC16-MC16/20-MC17).

In any case, I received info about the FM414 and the MC16 : it's the same white connector fitted on the HF-circuit, with the same colours of wires. And the same info confirms that indeed wire nr.1 is the PPM-signal, wire nr.2 being the Ground. My informant uses his FM414 as a pupil's transmitter.

GRAUPNER MC-20 :

On a German website I found the connections for the MC-20 and the interface for the FMS-simulator. Here you'll find the adapted drawing for my site (fig. 5-07).

If you cut the signal-wire and make the same connections as on the previous drawing, I suppose that you then obtain a "master"-radio. And for those who understood the principle, there couldn't be any problem to arrange this radio as a pupil-radio : you only have to use the OUT-signal and the Ground and your brains.

GRAUPNER MC-24 :

On a German website I found the connections for the MC-24 and the interface for the FMS-simulator. Here you'll find the adapted drawing for my site (fig. 5-08).

Here also no problem to use the radio as a pupil-TX. But I have no information on how to use this radio as a master-TX. So any owner of a MC-24 with knowledge about the matter please advice...

EXAMPLE :
In fig. 5-09 and 5-10 you'll find a complete drawing on how to connect a MC12 to a MC16 and vice-versa. Note that I have no info where to find a "+V Switched" for the MC16. As both transmitters have an opposite PPM signal modulation, an inverter is required. I suppose the pupil/teacher system will work as per drawing. I tested it with a MC10 and a MC15, which are both respectively similar to the MC12 and MC16.

CLICK HERE TO SEE THE DRAWINGS AT FULL SCALE.

Other Graupner radios

Up to the visitors of this site to transmit me more information about type of connectors, place and other useful stuff.

 
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