There is no problem to connect both TX for buddy box purpose. The 2 cables
you need have the following references :
1) Futaba F1576 : adapter-cable with the round Din connector on one side and
a mono female jack 3.5mm (1/8"),
the round Din being for master TX. See here for an example :
2) Futaba or Robbe 8362 : trainercable with on one side mono male jack 3.5mm
(1/8") and on the other side mono jack male 2.5mm (1/10").
here a pic :
Of course, it's very easy to solder a cable yourself : use figure 7f-05 of
chapter 7 of my website.
Anyway, do not forget to set the specific switch inside the FX18 on
"stu"-position to use as slave (student) !!!
http://users.belgacom.net/TX2TX : buddy box compatibility problems between
different brands of RC-transmitters.
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