I have a JR 8103 8 channel PCM radio and i want to use a 6V receiver pack instead of 4.8V. Can i do this?

Primarily this is to solve some problems related to the hall effect RPM sensor in my turbine control unit. Apparently if the current draw gets too high due to the high number of servo's, the voltage gets unstable and/or drops causing the RPM sensor for the turbine to fail.
It will give me more servo power too.

I am running the radio in my turbine powered hotspot with the following servo's:

2 JR 8411's
2 Voltz thin line servo's
1 JR 3321 servo
3 JR 531 servo's


Any help would be appreciated


thanks


Jon Dahlgren

I would suggest using a regulator to prevent over charged batteries from spiking any of your electronics if you use a 6 volt battery.

Dave

Hey Jon...I got a couple of 6V packs you can try if you want...I'm not using them at the moment...

..did you hear about my last landing, yet?



Wayne

Ok, i'll trade you for some wheel collars...


Thats twice now you've lost some wheels isn't it?


Are you running 6V packs in that shiny new JR 10 channel?

Hi Jon,
I am wondering how your controller Hall sensor (powered by the pump/controller battery) can be affected by the pull down of several servos on the Rx battery? The only connection between these two systems should be a one way from the Rx to the controller via the throttle 'servo' feed from the Rx. I am probably not familiar with your systems but possibly you have had some misguided information? The effect caused by the pull down of the Rx battery voltage should be somewhere in the neighbourhood of a PCM failsafe condition, but should not affect the Hall sensor, unless your are somehow using the same battery for both systems.

Sorry to sound so upity...
Len Gladstone

The power for the ECU comes from the receiver battery through the throttle servo lead. It is a Fadec unit. Therefore if the receiver battery has problems, so does the Hall effect sensor.

There is a seperate large battery that runs the fuel pump only.



Jon

I have the same JR 8103 8 channel PCM radio/PCM Reciever, as you, just different JR servos, I use a JR 6cell 6.0v/1800Mah with out any problems. I use it for 11 JR Servos and 1 JR Gyro. On a full charge I fly 2 times, for about 8mins each then I recharge. I usualy get a 7.1v reading after charging after 2 flights its around 6.6v.

This weekend i'm going to try a Sanyo HC 2000mah 4.8V battery on the above setup, just to see if i can feel any difference in flight. But 1 thing I do notice on the ground when i switch from a 4.8v to a 6.0v is that the Servo apprears to be alot quicker in response and pulling more power from it.


hope this helps

Robert

Thanks Jon, that certainly explains why you would get the effect from a pulled down Rx pack. I am used to separate packs for the ecu and the Rx, with the pump running from the ecu pack. The downside to that method is when the glow and starter function at the same time there can be a voltage depression. The upside is that the pump is not on at the same time as the glow plug. It seems a wider distribution of loads, but each has its own merits.

Thanks again,
Len

Hey F900 I saw your two 6 volt battery you brought to the field last week bring me one this week, I need some more voltage