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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Futaba FASST › Question about RX's
03-04-2012 06:49 PM  9 years ago
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joseheli

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Orange Park, FL

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Question about RX's
Guys, I really don't know how to explain my self on this, I hope you can understand me. Ok I have a 8fg radio and a regular 6 channel rx and JR servos. I am planning to run HV servos on my heli (more than 6v). My first question is can I use the standard receiver with HIght volt?

If not my other option but I am confuse with this is buying and running BUS HV. Now my question with this is kind of system, is if I buy a 3 channel bus HV receiver can I still use all the channel that the TX has even do is a 3 channel?

Guys sorry for my ignorance but I really don't understand how BUS works.

Thankn you
"No crash, No gain"
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03-04-2012 07:44 PM  9 years ago
kcordell

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O Fallon, MO

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It's S.Bus.
For a nice explanation of how it works, try this:

http://futaba-rc.com/sbus/index.html

Not sure how many have tried to run HV setups with the R617 (or other 6-7 channel RX's).
The R6203SB and R6208SB can handle HV.
The primary advantage of running say the R6203SB RX with a FBL controller like the CGY-750 is that all the connections except for power are made in the CGY-750. The only connection you make to the RX is the S.Bus (male to male servo lead) and power.
S.Bus is really great for the giant scale (and jet) guys that are running multiple servos on mutliple control surfaces. You actually tell the S.Bus controller what servo is doing what in the TX and are good to go.
And, NO, you do not need S.Bus servos in a heli (unless you want them).
Team Synergy/Rail, Team Scorpion, YS Engines, VelTye
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03-04-2012 08:23 PM  9 years ago
Flying Brian

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St. Clairsville, Ohio

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So we do not need specific s. Bus servos?"I just don't Listen" "
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03-04-2012 08:28 PM  9 years ago
joseheli

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Orange Park, FL

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Kcordell the rx that I have is not R6203SB or R6208SB. I have the R617FS will this still work with HV?"No crash, No gain"
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03-04-2012 09:16 PM  9 years ago
kcordell

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O Fallon, MO

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Better check with SKaluf on using the R617 with HV setups.
He can give you the correct answer.
And, again, you DO NOT NEED S.Bus servos to use the S.Bus system. If you are using the S.Bus in other types of applications, as shown in the video, you would then need the decoder so you can tell the TX what servo is doing what. The same goes for using the S.Bus servos, you program them directly.
Team Synergy/Rail, Team Scorpion, YS Engines, VelTye
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03-04-2012 11:31 PM  9 years ago
Phaedrus

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S. Orange County, California

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Bill Baxter, Krysta, and Steve have all written at various times that the true limiting factor with respect to voltage is your servos. The voltage limits of your servos determines what type of power arrangement you need to use.

To add to that I have personally tested a 617 with a freshly charged 3S lipo, no regulator, and a 1.5 amp load. No issues that I could find. Plus I have been running 2S LiFePO4 packs without a regulator on a number of 617 RXs for the better part of 2 years with no ill effects.
AMA Leader Member
Go FASST, or Go Home!!
Team Futaba
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03-05-2012 01:45 AM  9 years ago
joseheli

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Orange Park, FL

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Phaedra thank you for that info. So now my question is knowing that why Futaba makes a HV rx if they all can handle HV?"No crash, No gain"
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03-05-2012 02:37 AM  9 years ago
Phaedrus

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S. Orange County, California

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Futaba has a long history of being overly conservative with their ratings. As they have introduced newer receivers they have gone ahead and marked them as rated for HV. I am not aware of anyone having damaged their receiver running a 2S lipo.AMA Leader Member
Go FASST, or Go Home!!
Team Futaba
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03-05-2012 05:47 AM  9 years ago
Dr.Ben

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Richmond, VA, USA

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In the pre-HV days, Futaba designed receivers with the capability to easily handle the highest voltage used at the time which was basically a 5 cell NiCd. The receivers even then were designed with voltage regulation circuitry that would handle well over 6V, which is why even the receivers that have not been labeled as HV have done well on 2S lipo voltage. Knowing the way Futaba tests everything, it would not surprise me if the basis for the HV labeled receivers was taking what may have been a largely pre-existing design and then testing it specifically at HV voltage over a long extended interval to make double darn sure that the product was indeed acceptable at HV with no chance for failure due to source, IE 2S Lipo, voltage.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-05-2012 06:20 AM  9 years ago
joseheli

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Orange Park, FL

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Thank you Dr.Ben for does words of wisdom."No crash, No gain"
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