trainer cable "schematic"?

[Bob Chiang]

Hi all,

Can anybody tell me what pins to connect to build a trainer cable for two Hitec transmitters?

Thanks,
-Bob

[jeffs555]

http://www.welwyn.demon.co.uk/buddy.htm

[slipstick]

Hitec cords are master/slave and jeff's link only shows the slave end.

The wire from Pin 2 at the slave connects to pin 3 at the other end and there is no link between pin 4 and 5 at the master. You also need a wire connecting pin 1 slave to pin 1 master.

So that's :
Master/Slave
1 ------> 1
3 ------> 2
--------- 4 & 5 connected

Earth/ground connects to the sleeve at both ends

Steve

[Malc C]

The most comprenshive buddy cable list I've found to date can be found here http://users.belgacom.net/TX2TX/tx2tx/english/tx2txgb7.htm

[Bob Chiang]

Thanks for the information.

I will be using two Hitec transmitters, neither of them programmable. So it looks like I could use a two wire connection if I remove the crystal from the slave transmitter and both transmitters are powered. Is that correct?

I will adjust the trim levers on the slave transmitter so the control surfaces are in the same positions when transferring control from the master. Are there any other issues to take care of?

I've read that even while the student is controlling the plane, the teacher should be giving appropriate stick movements to minimize lag time if they need to take over. Any other suggestions?

Thanks again,
-Bob

[A.T.]

HITEC “ONE WAY TRAINER CORD” schematic

Note = Use of a Home made Trainer cord will void all warranties on both Master and Slave TX. – Assembler of home made cords and or user assume all liabilities.

Use fully shielded cable. Maximum length = 3M (Standard length 2.95m)

Label one plug “Master” and the other “Slave” or “Student” and solder wire using a good quality electrical solder only – no acid.

Student Master
1 __________________ 1 (Red)
2 __________________ 3 (Yellow)
3 __________________ 2 (Green)
4 ___
5 ___|
6 __________________ 6 (Black + shield)

The connector is numbered as shown below.. The view is from solder side of
the plug (where you solder the cable to the plug):

--------
/ 3 \
/ \
| 2 4 |
| 6 |
| l
\ 1 5 /
\_____^_____/ (Use a fixed pitch font to view.)


Double check that all solder joints are correct and that no hairs remain which could cause a short circuit.

When using any Trainer “Buddy” cord, ensure plugs are inserted into correct TX before the Master TX only is powered on. Remove the crystal or module from the slave TX. Old non computer TX operate as a Slave TX without any batteries therein but computer TX require the battery left in which is powered on when the trainer cord is plugged in.
Slave TX must NOT be turned on or damage may occur.

Removal of module, or crystal where module is not fitted, will prevent any extraneous RF output from Slave TX. Removal of module, or crystal where module not fitted, will extend battery life time when used as a controller with PC simulators.

Ensure that both Master and Student hold the cord firmly so that there is absolutely no pull, weight or strain on the plug or TX socket, especially if cord is stepped on.

Hitec and Futaba TX and RX are fully compatible except for PCM systems.
Both must be set to PPM if linked together - neither will operate the other's PCM RX.

Hitec Laser and Eclipse can also buddy mode 1 to mode 2 and vice versa. as if both are on the same mode.

Caution # 2:

Some of the very early Futaba 8UAP would let the smoke out of their trainer
board when connected to Hitec slave with TX battery in place. The 10µH coil
would burn out. Buddy operation would not operate but no other damage to
that 8UAP, remaining functions operating normally - simple fix with no more
problems. Futaba 9ZHP has 5V + through centre pin which is earthed to plug shield on
Hitec buddy boxes, not a good combination.

It is now possible to connect JR to Hitec or Futaba.
refer to 'Buddy Boxes. Servo Leads.Simulators.Interface"
at Alan's Hobby Web Links http://homepages.ihug.co.nz/~atong/
in particular "Intelligent Buddy Box Lead By Ken Hewitt" and
"TX 2 TX "

regards
Alan T.
Alan's Hobby, Model & RC Links
http://homepages.ihug.co.nz/~atong/
.................................................. ...........

[nixxon]

As A.T. wrote above in my words:

HITEC BUDDY CABLE LABELED "STUDENT"/"MASTER"
6 PIN MALE DIN

STUDENT <--------> MASTER
______S1 <--------> M1 (red)
______S2 <--------> M3 (yellow)
______S3 <--------> M2 (green)
______S4-\
______S5-/
______S6-\ <-----> /M6 (orange)
______SG-/ <-----> \MG (ground casing)

To use with Futaba radioes,
You should desolder connections to S1, M1, S6 AND M6

[MGeo]

Where can the proper DIN connector be purchased for a homemade cable?

[Malc C]

5 and 6 pin DIN plugs can be obtained from any audio retailer or electronic component supplier such as RS Components, Maplins (UK) or Digikey, radio shack in the US

[nicnicholson]

Plugs:

http://www.calrad.com/calrad/30series.shtml

part # 30-499