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-   -   Lipo in a DX3C? (http://www.oople.com/forums/showthread.php?t=109331)

AC199 02-09-2012 07:12 AM
Lipo in a DX3C?
 
Just wondering if its possible to fit a lipo into a DX3C transmitter?

I'm going to be looking into getting either a M11x or an M12 in a few months, but in the meantime, i'm just looking for some kind of project to get my teeth into...

Have trawled the web and cant find any info, but my Google skills have deteriorated lately, so any help would be appreciated.

AC

OneKiwi 02-09-2012 08:14 AM
Don't have a lipo unless you have a regulator. Spektrums take 6V and don't like 7.4 unless its the D3 etc models

Get a LiFe!! :p they are 6.6V and are small enough. I have done the mod to a couple of Dx3s/Dx3R/Dx3c works great and they are cheap and chargings easy.

You need to open the TX and solder on a female end of a servo extender.... Presto done

Get the smaller LiFe around 1500 mah lasts for AGES!!

Something like this
ONe
Two unsure if this fits as I have one from ebay like the first one but measure the hole

** I did a dx3R today Ill try and do a guide + pics next time

metalmickey0 03-09-2012 12:09 PM
Quote:
Originally Posted by OneKiwi (Post 690170)
Don't have a lipo unless you have a regulator. Spektrums take 6V and don't like 7.4 unless its the D3 etc models

Get a LiFe!! :p they are 6.6V and are small enough. I have done the mod to a couple of Dx3s/Dx3R/Dx3c works great and they are cheap and chargings easy.

You need to open the TX and solder on a female end of a servo extender.... Presto done

Get the smaller LiFe around 1500 mah lasts for AGES!!

Something like this
ONe
Two unsure if this fits as I have one from ebay like the first one but measure the hole

** I did a dx3R today Ill try and do a guide + pics next time
I`d like to do lipo in my DX3C as well so destructionbs and pics would be good

lordnikon 03-09-2012 01:21 PM
Got one of these 1000mah things in mine

http://www.vapextech.co.uk/acatalog/...Batteries.html

works a dream and stays at 6.5v for ages. Plenty to do 3-4 all day events without charging. Turn off Tx even if the 10min warnout alarm goes off if you forget.

Literally cut the female end off this

http://www.maplin.co.uk/servo-extension-lead-48176

Cut the white cable off completely, cut the battery tray out of the Tx and solder the red and black wires on as needed. Job done

OneKiwi 03-09-2012 04:06 PM
Yep thats the easy way, I like trying not to destroy the trays so I take the screws out and take the tray out whole.

Otherhand that is the quickest way by far if you not worried about the tray and I presume if you sell it on then the next buyer wouldn't be to concerned about the upgrade

mattr 03-09-2012 04:33 PM
You want to use my radio for the guide/pictures?

Won't be driving until after the weekend now (track will be shut on the weekend i imagine, they are racing on the tarmac)

lordnikon 03-09-2012 05:20 PM
Quote:
Originally Posted by OneKiwi (Post 690556)
Yep thats the easy way, I like trying not to destroy the trays so I take the screws out and take the tray out whole
I agree completely, when i say cut the tray i meant the wires. I did remove all of the screws (about 6 iirc) and kept the tray complete. Easy enough to put back in if i sell on :D

mark christopher 03-09-2012 06:45 PM
just bear in mind if your transmitters manufacture says it takes 6 volts and you put 6.6 or 7.4 in it then you are breaking the BRCA general rules which makes it ilegal for any meeting you do from club to national if they are a BRCA club

i know as i was challenged at a 10th ic meeting for running a 3s lipo in my helios,(clarified by the BRCA) i had to prove that it takes 8 AA pencels which is 12volts, they argued it was 8 x 1.2v (9.6 volts) cells until i explained ko only recomend dry cells!

OneKiwi 03-09-2012 07:36 PM
OMG seriously? I didn't even think of that. WHy? DO they think it will overload the electrics and cause fires or what?

mattr 03-09-2012 08:49 PM
Quote:
Originally Posted by OneKiwi (Post 690627)
OMG seriously? I didn't even think of that. WHy? DO they think it will overload the electrics and cause fires or what?
Probably as they think thhe transmission power will go over it's rated value. Except it won't.

mattr 04-09-2012 06:13 AM
Does anyone have a link to the specific rule controlling this?

I've had a rummage on the BRCA site and it only refers to "General Rule 10" which seems to be pretty much none existent. Unless it refers to drive gradings. Which i doubt.

mark christopher 04-09-2012 10:49 AM
page 21 section 10

first paragraph

http://www.brca.org/sites/default/fi...204%20Site.pdf

lordnikon 04-09-2012 11:57 AM
Oh dear, this scream anal retentive. I appreciate rules are rules but is .6v (6.6v life vs 6v of AA's) really going to make any difference :rolleyes:

mark christopher 04-09-2012 12:24 PM
Quote:
Originally Posted by lordnikon (Post 690835)
Oh dear, this scream anal retentive. I appreciate rules are rules but is .6v (6.6v life vs 6v of AA's) really going to make any difference :rolleyes:
depends if you want to take on the BRCA...

will .3 of a volt make a difference on a fully charged lipo pack for example?

OneKiwi 04-09-2012 12:29 PM
What if you discharge the battery before using it to 6V

metalmickey0 04-09-2012 12:48 PM
Quote:
Originally Posted by lordnikon (Post 690835)
Oh dear, this scream anal retentive. I appreciate rules are rules but is .6v (6.6v life vs 6v of AA's) really going to make any difference :rolleyes:
Thats good then as never have had 6v in my Dx3C. 4.8 is the max i`ve ever had. Just wish they did higher voltage AA cells:cry:

mattr 04-09-2012 01:45 PM
Quote:
Originally Posted by mark christopher (Post 690850)
depends if you want to take on the BRCA...

will .3 of a volt make a difference on a fully charged lipo pack for example?
Different thing altogether. An extra .3v on a lipo leads to a direct increase in performance. An extra .6v on a TX leads to exactly eff all. Or you'd not be allowed to use 8 cell TXs.......

mattr 04-09-2012 01:46 PM
Quote:
Originally Posted by OneKiwi (Post 690854)
What if you discharge the battery before using it to 6V
Just put a 6V regulator in the circuit........

mark christopher 04-09-2012 01:50 PM
Quote:
Originally Posted by mattr (Post 690883)
Different thing altogether. An extra .3v on a lipo leads to a direct increase in performance. An extra .6v on a TX leads to exactly eff all. Or you'd not be allowed to use 8 cell TXs.......
rubbish, ko manufacture there radio (apart from the new one) to run on 12 volts, its the manufactures spec you can not exceed..

manufacture says for that radio 6 volts.

mattr 04-09-2012 01:50 PM
Quote:
Originally Posted by mark christopher (Post 690791)
Quote:
Originally Posted by BRCA
10. Radio Equipment
The BRCA recognises the UKRCC as the national authority for the UK on radio equipment.
The BRCA will work within the rules and
guidelines specified by the UKRCC RC Equipment must be used in accordance with the manufacturers guidelines. Any modification to any component that may affect performance and/or power of original equipments is specifically not
allowed. This applies especially to the aerial and power source.
Only published frequencies are allowed (see Handbook). The reversal of crystals is not allowed.
It is not allowed to use any form of active telemetry, which in the opinion of the event officials or steward, is judged to give a competitor an advantage during any race. Therefore, it is not allowed for any radio/wireless signals to be
transmitted from the car to an external source during a race, that is judged by the officials to
give the driver a competitive advantage during that particular race.
So we are ok then, the output signal from the Transmitter is not related to input voltage, as its on a separate, regulated circuit.


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