Multiplex Profi Car 403

I'm so pleased with this radio I wanted to share it with everyone. The Multiplex Profi Car 403 is a 75mhz, positive shift, pistol grip transmitter that can run up to 7 Channels. Mine came with a synthesizer, rechargeable battery & charger all for $65!

PARTS & SUPPLIES NEEDED
Positive shift receiver & crystals

TOOLS
Reading glasses
A brain


1. I've been running a TQ3 with great success but between the 1:7 H3 build and wanting a few more tricks for my comp rig I knew I'd want a few extra channels coming off my TX. The issue I had was that I wanted something simple, cheap, 4-5 channels AND a pistol grip. I was pretty happy with the TQ3 so I didn't scour the earth but I got a tip from a TXRCRCA member about a Multiplex radio and decided to look into it.


2. Knowing nothing about radios I must say that I was a little lost when talking with different people about this radio and a receiver. I followed the link to Hobby Horse to order a radio. Ordering from Hobbyhorse.com was pretty easy and I highly suggest them as other places (ebay included) want over $300 for these radios! Being new to all this, I did a lot of back and forth between Multiplex & Hobby Horse asking questions via phone. Jim at Hobby Horse eventually hooked me up with 2 Multiplex 7ch RXs at a great price so I went ahead and ordered a second radio. That way I have 2 of everything if something should fail.

3. The Multiplex RXs are fine for my 7 ch scaler ... but I also wanted something for my comp rig that could take the higher volts I push to my servos with my Castle BEC. I did a little looking and found the Novak XXTRA 5ch RX. It is also synthesized and although it only has 5 channels it can take up to 10v to the servos!


4. Once I got my Novak RX in I decided to setup my first radio. With a little practice I started to figure it out and got the langauage changed to english when I ran acrosss a problem. I couldn't find anything in the instructions that tell me how to change frequency. I read the manual twice and didn't see anything. I was getting concerned because the instructions said how to change a crystal but this was supposed to be synthesized.Finally, I found a loose addendum to the manual in all the papers they sent. They have several different language booklets and lots of additional sheets because the manual is for the original non-synth version. If you are reading this and haven't figured it out, just hold the wrench button while you turn it on ;)


6. As far as setting the radio up, it has tons of adjustability. In "Truck Mode" (also known as "2+5") you can run up to 7 channels. Ch 1 & 2 fuction as steering & throttle (duh) and the radio even has different settings for throttle curve, speed sensitive steering and more. Channels 3,4, & 5 are rocker switches around the wheels and each can be set a few different ways. "3ST" gives you a 3 stage servo while the proportional setting allows you to take baby steps using the rockers. The step percentages can be adjusted as well. There is a third setting that acts as a flash which may come in handy for blinkers on a scaler. CH6 is a thumbwheel in the grip & Ch 7 is an on/off which would be perfect for lights or even a little horn.


7. Anyway, I am now able to run my dig setup in Fwd, 4x4 & Fwd w/brake. I can program up to 6 models with individual settings, it has a battery alarm, timers and a bunch of other stuff I'm to stupid to use. It also shows battery voltage on the screen and shows you where the servos are in their ranges, all on the screen. Anyway, for the amount of features you get with this radio I think this is a fantastic buy and would recommend it to anyone.


For those that would like to read the manual ahead of time and start going through all the features it has: Instruction Manual