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#### rabi_tagore

• Jr. Member
• Posts: 13
##### Two Transmitters on One Receiver!??
« on: January 21, 2007, 10:06:50 PM »
Hey,
I am constructing my first robot and am in high school, so I do not have great exposure to robot construction.
Now that my intro is done, here's my question:
Is it possible to use TWO 4-channel transmitters to control a robot that is equipped with only ONE 8-channel receiver?

I think I know what I have to do, but am not very sure how to implement my idea. Since every channel has a (slightly)different frequency, I could possibly assign the first 4 channels on the receiver to the first transmitter, and the second four channels on the receiver to the second transmitter. However, this assigning of channels is what is creating a problem for me. First, is it possible to assign channels like that? If it is not, could other ideas work?

More background info:
The 2 transmitters are Hitec Laser 4 75Mhz(surface, 4 channels) each, and the receiver is a regular surface 8-channel receiver.
Our school's budget, my limited knowledge, and the remaining time unfortunately do not let me explore microcontrollers and some 7-channel programmable transmitters. However I will learn how to work with 'em if those are what are required for my job. Just waiting for ur feedback....

Thanks a lot

#### gamefreak

• Supreme Robot
• Posts: 543
• Robo-Enthusiast
##### Re: Two Transmitters on One Receiver!??
« Reply #1 on: January 22, 2007, 07:34:49 PM »
lol i dont have a clue about RC, and hey im in highschool as well(the only one who knows anything about robots  ), But no i dont think this would work. Since the transmission is a certain frequency each channel is looking for a specific frequency and i dont beleive you can do that.
All hail Rodney, the holy 555 timer
And Steve said: "Let there be lead!"

#### dunk

• Expert Roboticist
• Supreme Robot
• Posts: 1,086
##### Re: Two Transmitters on One Receiver!??
« Reply #2 on: January 23, 2007, 03:41:30 AM »
why do you need to use the same receiver?
why not just use separate 4 channel receivers for each transmitter, both operating on different frequencies?

dunk.

• Supreme Robot
• Posts: 11,696
##### Re: Two Transmitters on One Receiver!??
« Reply #3 on: January 23, 2007, 08:10:56 AM »
if you have a programmable remote, i think you can select which channels are used, allowing two remotes for one receiver . . . not sure though . . .

this is the remote i have sitting on my desk right now:
it has some programming functionality, but ive never needed that yet - not sure what it can do . . . check the manual . . .

Quote
why not just use separate 4 channel receivers for each transmitter, both operating on different frequencies?
probably the easiest way to go about it. i did that for this robot:
http://www.societyofrobots.com/images/sumo_robot.jpg
getting two people to control one robot as a team was the hard part . . .

#### rabi_tagore

• Jr. Member
• Posts: 13
##### Re: Two Transmitters on One Receiver!??
« Reply #4 on: January 23, 2007, 01:52:42 PM »
I guess I will just stick to the sumo_robot design. It seems to be the easiest to implement. I was just trying to avoid the use of another receiver, but it's alright.

Thanks a lot.

#### gamefreak

• Supreme Robot
• Posts: 543