Wrong Radio?

[Rick.K]

The Tamiya Attack 2.4 ghz T/R arrived last night. Have not had a chance to try it yet. The instructions for the radio do not state what type of battery the included receiver uses (the instructions for the radio do not mention the receiver at all). I was surprised to see how small that receiver is (battery included inside?).

It made me wonder why the Tactic TTX 404 receiver uses a four "AA" cell battery pack to power it.

I was disappointed that the Tamiya radio did not include the shifter gate. Then I opened the box for the motorized leg support that is supposed to include the steering gate, and it was not there either. I can try to make my own. Where can I get the shift and steering gates for the Attack radio if I can make good accurate ones?

[CustomRCmodels]

Originally Posted by Rick.K

The Tamiya Attack 2.4 ghz T/R arrived last night. Have not had a chance to try it yet. The instructions for the radio do not state what type of battery the included receiver uses (the instructions for the radio do not mention the receiver at all). I was surprised to see how small that receiver is (battery included inside?).

It made me wonder why the Tactic TTX 404 receiver uses a four "AA" cell battery pack to power it.

I was disappointed that the Tamiya radio did not include the shifter gate. Then I opened the box for the motorized leg support that is supposed to include the steering gate, and it was not there either. I can try to make my own. Where can I get the shift and steering gates for the Attack radio if I can make good accurate ones?

all receivers need a power-source of 5Volt to operate . Therefore the deal with the 4xAA battery packs .
The Tamiya Attack needs that too :

REQUIREMENTS
AA Batteries: Four for transmitter
Receiver Battery: 4.8-6.0V battery pack (do not use dry-cell
batteries as receiver's power source)

but in your case by using the Tamiya MFU , you don't need no extra power on the receiver , since the MFU supplies power to the receiver.

If you would use this radio-system with any other truck , boat or any type of vehicle , which uses a ESC ( electronic speed controller ) and it is one of them which has a BEC ( battery eliminator circuit ) , then you will not need extra power to the receiver either.

since you are new to all of this , you may want to look at these 2 webpages
( even thought I have that posted in my tanker-section , it also applies to the truckers ) ,
explanation about stick modes and other radio system terms :

http://customrcmodels.com/Tanks/id92.htm

http://customrcmodels.com/Tanks/id79.htm

don't get too confused with these info's , but again , some of that stuff listed there applies to the trucks as well .

[Rick.K]

Since the Tamiya receiver has only four connections, and they are all for servos, how is power passed to the receiver?

[ricm]

the servo cables have 3 wires. In the case of Futaba you have:

red = +ve supply
black = -ve
white = signal from receiver

when everything is plugged in, the red wires all end up being interconnected through the receiver, same for the black wires, so the receiver and servos all share a common power connections. Your receiver will get its power from the MFU through the red and black wire(s) of J4, J5, J6 and/ or J7. The white wire of each of these leads carries the control signal in the opposite direction, from the receiver to the MFU. If you didn't have the MFU, one of your 'servos' would be the ESC so the receiver would get power through the red/ black leads from that instead.

If you have the MFU, don't bother with the steering gate. The MFU default mode de-activates the shifter servo in preference for the horn, and its useful to have the horn function whilst steering also. You just need to remember to de-activate the coupler mode (ie. return to horn mode) after you connect/ disconnect the trailer, then there's no chance of the trail de-coupling anyway. I took my steering gate off after my first run and I've never used it since.

If you contact Futaba directly and ask them really nicely, they should send you a shift gate free of charge.....they sent one to me in Australia from USA at no cost after my original one had dropped off and I lost it ;-) I believe the Tamiya Attack unit uses the same stick bezels as the original Futaba Attack 4VWD radio, so the Futaba shift gate should fit. In any case, it shouldn't cost you anything to try.

If you are still stuck, I have spare Futaba shift and steering gates but it'll cost me $12 to ship them to you.