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-   -   Futaba 4PX (https://www.rctech.net/forum/radio-electronics/809530-futaba-4px.html)

branover 03-30-2015 07:30 AM


Originally Posted by jhautz (Post 13933253)
204 receivers work, but the fastest frame rate comes with the 304. Also, the 304 has the ID code in the receiver so the car can't be run with the wrong model selected in the radio. Like spektrum has been doing all along. With the 204 if you turn on 2 cars with the 204 Rx the radio will run them both at the same time. With 304 receivers only the selected model runs.

Perfect, thanks so much. I'll likely go with the 304E then. I like the internal antenna.

sakadachi 03-30-2015 09:36 AM


Originally Posted by jhautz (Post 13933253)
204 receivers work, but the fastest frame rate comes with the 304. Also, the 304 has the ID code in the receiver so the car can't be run with the wrong model selected in the radio. Like spektrum has been doing all along. With the 204 if you turn on 2 cars with the 204 Rx the radio will run them both at the same time. With 304 receivers only the selected model runs.

That's great info! I always wondered why my R614FS and FF-E's (I run the 4PKS-R) weren't smart like my super cheap Spektrum receivers with the model-specific binding. :lol:

DirtyDanLand 03-30-2015 10:40 AM


Originally Posted by branover (Post 13933242)
...Also it seems I should get a battery pack for it? Any recommendations?...

I use this battery

sakadachi 03-30-2015 10:50 AM

Do you guys just charge these LiFe batteries outside your transmitters then?

I just find plugging in my radio when the battery is low is more convenient. :confused: considering that my 4PKS-R can run 9hrs+ on the factory Nimh.

DirtyDanLand 03-30-2015 10:54 AM


Originally Posted by sakadachi (Post 13933655)
Do you guys just charge these LiFe batteries outside your transmitters then?

I just find plugging in my radio when the battery is low is more convenient. :confused: considering that my 4PKS-R can run 9hrs+ on the factory Nimh.

the LiFe batteries have to be unplugged from the radio to charge it...

JayL 03-30-2015 01:16 PM

YES! charge outside of radio

no way I want my $500 radio to catch fire when my batteries have an issue....I have seen nicd, nimh and lipo fires

I only charge it at home between races, never had to charge at the track

sakadachi 03-30-2015 04:44 PM


Originally Posted by DirtyDanLand (Post 13933662)
the LiFe batteries have to be unplugged from the radio to charge it...

At least the LiFe batteries you can charge them and keep it in the charged state like NiCd/NiMH. :)



Originally Posted by JayL (Post 13933938)
YES! charge outside of radio

no way I want my $500 radio to catch fire when my batteries have an issue....I have seen nicd, nimh and lipo fires

I only charge it at home between races, never had to charge at the track

Wow, I've been using the plug-in slow charger on my past radio's and my 4PKS-R. Never had such issue! :lol: I must be lucky.

I also modded the charger plug so that I can plug it into the radio -or- plug my spare TX NiMH to it outside the radio and charge. (not charge at the same time, BTW).

B16A2 03-30-2015 07:17 PM

Very lucky indeed,

The radios lack the smarts to charge the LiFe batteries and they will over charge them causing potential for disaster.

sakadachi 03-31-2015 05:34 AM


Originally Posted by B16A2 (Post 13934648)
Very lucky indeed,

The radios lack the smarts to charge the LiFe batteries and they will over charge them causing potential for disaster.

Just to be clear I am not charging LiFe off my NiMh charger! :D

jiml 03-31-2015 06:13 AM


Originally Posted by Rmbatch (Post 13930455)
The distributor plugged power into the RX and it was already connected to the radio. He didn't have to go through the binding process. I may not have explained it properly in my previous post.

I also don't understand why you can't reverse the channels in the radio, as I thought this function was available to help with a reversed motor. However, the distributor told me that it could have caused issues with this setup and my ESC.

Wait, let me get this straight, you're trying to reverse the direction of the motor from the radio???

You can't do that! If you use the servo reverse feature for channel 2, what you're doing is changing what the throttle does when you pull the trigger. In other words, if you pull the trigger and the brakes are applied, and pushing the trigger makes the car accelerate, then reversing ch.2 in the radio will fix that. It will not change the direction the motor is spinning.

B16A2 03-31-2015 01:23 PM


Originally Posted by sakadachi (Post 13935224)
Just to be clear I am not charging LiFe off my NiMh charger! :D

That will be fine then, the 4PK/4PX can safely charge NiMh/NiCads from the charger port (slow charge).

Danny Teh 04-01-2015 07:12 AM

1 Attachment(s)
does 4PX in USA comes with a dry battery tray ??
I bought a set and it doesn't.
Only got a life TX batt.

Anyone knows where to buy one ??

RumbleBeeAL 04-01-2015 07:48 AM


Originally Posted by Danny Teh (Post 13937319)
does 4PX in USA comes with a dry battery tray ??
I bought a set and it doesn't.
Only got a life TX batt.

Anyone knows where to buy one ??

Mine included the dry battery tray. However, some box options may differ for example, some boxes are optioned with a TX battery and 2 RXs. If this is the case, maybe the manufacturer doesn't include the dry tray thinking it wouldn't be used?

Did you buy yours new or used? If new, was the box sealed?

Danny Teh 04-01-2015 08:28 AM

Yes bought it brand new.....so many different package.....wonder why mine didn't have one......sigh.......

I prefer to have a tray rather than not to have one.......

Know anywhere I could get it ?? in USA maybe

sakadachi 04-01-2015 05:14 PM


Originally Posted by Danny Teh (Post 13937319)
does 4PX in USA comes with a dry battery tray ??
I bought a set and it doesn't.
Only got a life TX batt.

Anyone knows where to buy one ??

Dang, I wanted this tray for my 4PKS-R too.. :( Easier to use Eneloops as backup.


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