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Author Topic: reciever voltage  (Read 2980 times)

portside II

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reciever voltage
« on: October 24, 2008, 10:10:15 am »

I have read somewhere on here that recievers will take more than 4.8v that is supplied with a radio set ,but how much more ? .
I have bought a futaba 2,4g set and replaced the standard tx battery pack with a 2600ma pack rather than fit an external jack for a 12v sla ,but i am thinking of buying some 6v reciever packs to replace the standard 4.8v ones .? will they work ? on the 2.4g rx and 40mhz/27mhz witout over loading them ? .
daz
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andrewh

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Re: reciever voltage
« Reply #1 on: October 24, 2008, 10:35:06 am »

Portside,

Several questions there

As far as I know all receivers will take 6V happily - they used to be powered by four AA alkali cells.  (in case it is of interest four Lithium disposable cells are well over 6V and this is  fine with all the receivers used by Footy drivers)

Some receivers  - usually older 27Mhz are marked BEC. 
I BELIEVE this means that you can plug in a 6 or 7 cell buggy pack and the Rx will look after its own voltage. 
Because I have never had confirmation of this I would not suggest it to others (but I have checked that my BEC receiver contains a regulator chip and am quite happy to run it on one or two LiPo cells (up to 8V)

I have not yet got my hands on a 2.4GHz receiver, but I understand there is a TX mod (replacement of a regulator chip)which triples the battery life

andrew
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portside II

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Re: reciever voltage
« Reply #2 on: October 24, 2008, 10:13:22 pm »

Thanks Andrew ,regarding the TX thats why i bought a new battery pack ,either modding the regulator or fitting a jack socket for an external power source would invalidate the warranty  :embarrassed: , maybe in the future , lets see how i go on with this method .
The reason for the higher voltage battery pack is in my brakengarth i have a square 4.8v pack and an ACtion bec fitted to compensate for the demand for receiver,servos sound unit etc and my concern was if the TX likes the power then maybe the Rx does too , and its about time i bought a new Rx battery  :-) .
The other thing is i have a couple of esc's that have a output for the receiver ,black and white lead with a red plug on the end , now i found out to my cost that the supply voltage for the esc is up to 12v but the esc does not have a BEC  :embarrassed: , so 12v in 12v out fizzle fizzle ,blue smoke  :'( one 6ch micro Rx dead  <:( .
daz
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barriew

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Re: reciever voltage
« Reply #3 on: October 25, 2008, 10:36:41 am »

Daz,

If you already have a stand-alone BEC, you can connect this to your 12volt drive battery and power your receiver from it. I don't see the point in connecting a 4.8volt pack to a BEC - unless I misunderstand you - which is quite possible %)

Barrie
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malcolmfrary

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Re: reciever voltage
« Reply #4 on: October 25, 2008, 12:03:20 pm »

In case of any misunderstanding, the vast majority of BECs can only reduce voltage to a stable level.  They do not increase voltage.  Those that do can be recognised by the extra zero or two at the wrong end of the price.  If a 4.8 volt pack is in use, a BEC is pointless.
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rcfred

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Re: reciever voltage
« Reply #5 on: October 26, 2008, 10:28:58 am »

I have run my Futaba 2.4GHz receiver using a 5 cell NiMH battery in my Laser yacht for several months with no problems. Other Laser users do the same with both 27 and 40 MHz receivers. We do it to increase the speed of the sail winch which is a little slow on 4.8 volts.

I would not recommend any higher voltage for receivers without a built-in BEC to handle it. In fact many modern receivers have an internal voltage controller to reduce the voltage to 3.3 volt and it will probable blow if asked to drop a higher incomming voltage above 6 volts.

Fred
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portside II

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Re: reciever voltage
« Reply #6 on: October 26, 2008, 06:19:07 pm »

Cheers lads , Fred  i dont think i will be increasing the voltage above 6v , my main concern was that the reciever would make a greater demand on the reciever battery and the seperate BEC .
Dave i will try and ring you this evening  now i have your number in my phone , me put wrong one in  :embarrassed: it was not you :o .
daz
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Sandy Calder

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Re: reciever voltage
« Reply #7 on: October 27, 2008, 08:23:39 pm »

Cheers lads , Fred  i dont think i will be increasing the voltage above 6v , my main concern was that the reciever would make a greater demand on the reciever battery and the seperate BEC .
Dave i will try and ring you this evening  now i have your number in my phone , me put wrong one in  :embarrassed: it was not you :o .
daz
Do you have a voltmeter by any chance?
You may find a nominal six volt receiver pack is an actual 6.7 volts.
Regards
Sandy
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portside II

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Re: reciever voltage
« Reply #8 on: October 27, 2008, 10:15:30 pm »

good thought  there Sandy , will have to check .
daz
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portside II

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Re: reciever voltage
« Reply #9 on: November 02, 2008, 02:08:09 am »

Had a natter with my sparky , and have been told off  >>:-( about using the bec and reciever pack together ,
i have now taken off the two servos that were used to run the radars which has reduced the demand from the bec/battery and will either run off the bec or the battery pack not both.
Problem sorted.
daz
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