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JesusFreak · 10-07-2006, 09:57 AM

Hey Guys:

I've had some guys on E-Zone claim that there are problems with the Hitec HS65 Servoes and the Spektrum Radio/Receiver? This is the setup I have in my SE which I haven't flown yet.

They claim that the Receiver doesn't put out enough juice for the Servos and that can cause some serious issues. Anyone had this problem? Does it only happen when the pack gets run down? They said the reciever is only feeding a bit over three volts to the servos. I thought the speed controls pretty much regulated down to 4.8 or 6 volts. If we aren't getting full voltage to the servoes we aren't getting anywhere near the performance they are rated at.

Thanks!
Lee

dct · 10-07-2006, 10:23 AM

I sure don't know anything about that receiver,, but the speed control is plugged into the receiver,, so,, power for the motor seems like it would go from the battery to the esc then from there strait to the motor. And the wire that plugs from the esc to the receiver ( 3 wires ) that wire will run the servos and receiver,so power is still coming only from the receiver to run the servos ... I think?

bluemooone · 10-07-2006, 10:40 AM

I really find this hard to beleive. I am runing both HS65 s and HS56 s on 3 and 4 cell helis and have had no problems. Also futaba S9650 s on tails. No problems as far as I can tell.

jack726 · 10-07-2006, 11:08 AM

There is no problem with that setup.

JesusFreak · 10-07-2006, 11:36 AM

Thanks guys. They seemed to be biased toward the JR PCM radios, and I never heard of any issues before.

Thanks,
lee

flyinfool · 10-07-2006, 11:44 AM

If you are only getting 3 volts out of the receiver then there is a problem with the power supply in the ESC.
I haven't looked but I'll bet that the servo power is on the same buss as the throttle channel so the voltage out of the RX must be the same as the voltage in.

Icenum · 10-07-2006, 12:02 PM

From what I can tell, DX6 is JR through HH.

bluemooone · 10-07-2006, 12:12 PM

They just want to spread spektrum envy!

JesusFreak · 10-07-2006, 01:04 PM

Well, it's not hard to tell. I'm gonna wire things up and check the voltage.

Anyone else heard there will be a 9 Channel Spektrum based system out soon?

Regards,
Lee

captcasper7 · 10-07-2006, 02:21 PM

I run the DX6 and I have no problems at all

Mike

redgiki · 10-07-2006, 02:29 PM

The *signal* wire on the Spektrum puts out 3.3 volts, rather than the usual 5 volts. There has been online speculation about this (since it's unusual, though not unheard of), and people misunderstanding the difference between the signal wire and the power wires don't know enough to know the difference. These are probably the same guys who advocate reversing your servo by switching polarities on the servo wires.

Your servos are still getting 5 or 6 volts to the motor (depending on your setup), and they'll work fine. The signal circuitry in your servos doesn't even need 3.3 volts to be effective.

Some people thought this might be the reason that HS-65's respond a little slower on CCPM setups using the Spektrum, but it's become apparent that the problem is something to do with the programming of CCPM mode on the Spektrum transmitter itself. Helis which use mechanical mixing show no sign of such sluggishness, regardless of servo brand used. It's purely a CCPM thing, and virtually unnoticeable to those who haven't flown on high-resolution helis before.

bmlasater · 10-08-2006, 06:58 PM

fwiw...

Seems all the dss chips like 3v. the tx actually runs the rf board on 3.3...That's the reason the Spektrum sucks batt power...An upgrade is available, do a search for "Spektrum switching regulator."

John.

cbdane · 10-08-2006, 07:23 PM

Quote:

Originally Posted by bmlasater

fwiw...

Seems all the dss chips like 3v. the tx actually runs the rf board on 3.3...That's the reason the Spektrum sucks batt power...An upgrade is available, do a search for "Spektrum switching regulator."

John.

The regulator is for the transmitter. I haven't heard of converting the receiver. The receiver uses comparatively very little power so having it run at 3.3V has virtually no effect on battery life. The transmitter, on the other hand, has to broadcast the RF signal and drops the voltage from 10-11V to 3.3V to derive its power so it benefits from the switching regulator.

Remember that the servos are not powered through the receiver. The receiver just passes the current on at whatever voltage is delivered from the BEC. The only possible issue with the receiver is whether the traces on the board between each servo plug are beefy enough to handle the current requirements of a set of large, digital servos. No problem at all for the HS65's which are neither large or digital.

BTW: When Futaba first introduced its PCM receivers, they had 3.3V control pulses which did cause some servo compatiblity issues. As a result, servo manufacturers made sure that their servos would be able to use these lower voltage pulses and I doubt that it is a problem with any servo made in the last 10 years.

kgfly · 10-08-2006, 11:08 PM

Yup, I run DX6 with HS-65MG on a TrexSE and no problems at all.

BTW there have been several posts over on RCG about a Spektrum demo last weekend of a new high end Tx flying a large scale turbine jet. No more details so far. Looks like gen2 is almost here...

cbdane · 10-09-2006, 12:22 AM

Quote:

Originally Posted by kgfly

Yup, I run DX6 with HS-65MG on a TrexSE and no problems at all.

BTW there have been several posts over on RCG about a Spektrum demo last weekend of a new high end Tx flying a large scale turbine jet. No more details so far. Looks like gen2 is almost here...

Look for an announcement at iHobbyExpo on the 17th! But, then again, what do I know?

oscillator · 10-09-2006, 12:56 AM

I can confirm there will be an announcement at iHobbyExpo. Will be significantly upgraded from the DX6 - 5 point curves, nicer gimbals, big display area, and seven channels (I know, 9 would have been better). Got to play with it a little and it was sweet. Can't wait.

cbdane · 10-09-2006, 01:21 AM

Quote:

Originally Posted by oscillator

I can confirm there will be an announcement at iHobbyExpo. Will be significantly upgraded from the DX6 - 5 point curves, nicer gimbals, big display area, and seven channels (I know, 9 would have been better). Got to play with it a little and it was sweet. Can't wait.

Basically the 7102 transmitter platform. Larger receiver, one of the two antennas can be located remotely. Should be sweet! Any news on when they hit the stores?

10-07-2006, 09:57 AM	#1 (permalink)
JesusFreak Registered Users Join Date: May 2006	Problems with HS65s and Spektrum? Hey Guys: I've had some guys on E-Zone claim that there are problems with the Hitec HS65 Servoes and the Spektrum Radio/Receiver? This is the setup I have in my SE which I haven't flown yet. They claim that the Receiver doesn't put out enough juice for the Servos and that can cause some serious issues. Anyone had this problem? Does it only happen when the pack gets run down? They said the reciever is only feeding a bit over three volts to the servos. I thought the speed controls pretty much regulated down to 4.8 or 6 volts. If we aren't getting full voltage to the servoes we aren't getting anywhere near the performance they are rated at. Thanks! Lee __________________ "Keep it pithy." eAurora, TREX600E, TREX 600 HFEX, TREX500, Vibe 50 (Professional grade pretzel maker).

10-07-2006, 10:23 AM	#2 (permalink)
dct Registered Users Join Date: May 2006	I sure don't know anything about that receiver,, but the speed control is plugged into the receiver,, so,, power for the motor seems like it would go from the battery to the esc then from there strait to the motor. And the wire that plugs from the esc to the receiver ( 3 wires ) that wire will run the servos and receiver,so power is still coming only from the receiver to run the servos ... I think? __________________ Now doing EASY 3D!! And having a Ball !!Trex 550e FBL V2 AR7200BX with CC BEC PRO ,And T-rex 450 Pro, DFC with AR7200BX , Blade 300CFX, and Two, Blade 130X , Blade 350QX .!

10-07-2006, 11:36 AM	#5 (permalink)
JesusFreak Registered Users Thread Starter Join Date: May 2006	Thanks guys. They seemed to be biased toward the JR PCM radios, and I never heard of any issues before. Thanks, lee __________________ "Keep it pithy." eAurora, TREX600E, TREX 600 HFEX, TREX500, Vibe 50 (Professional grade pretzel maker).

10-07-2006, 11:44 AM	#6 (permalink)
flyinfool Registered Users My HF Map location Join Date: Apr 2005	If you are only getting 3 volts out of the receiver then there is a problem with the power supply in the ESC. I haven't looked but I'll bet that the servo power is on the same buss as the throttle channel so the voltage out of the RX must be the same as the voltage in. __________________ Jeff Borowski

10-07-2006, 01:04 PM	#9 (permalink)
JesusFreak Registered Users Thread Starter Join Date: May 2006	Well, it's not hard to tell. I'm gonna wire things up and check the voltage. Anyone else heard there will be a 9 Channel Spektrum based system out soon? Regards, Lee __________________ "Keep it pithy." eAurora, TREX600E, TREX 600 HFEX, TREX500, Vibe 50 (Professional grade pretzel maker).

10-07-2006, 10:40 AM	#3 (permalink)
bluemooone Join Date: Jul 2006	I really find this hard to beleive. I am runing both HS65 s and HS56 s on 3 and 4 cell helis and have had no problems. Also futaba S9650 s on tails. No problems as far as I can tell.

10-07-2006, 11:08 AM	#4 (permalink)
jack726 Registered Users Join Date: May 2006	There is no problem with that setup.

10-07-2006, 12:02 PM	#7 (permalink)
Icenum Join Date: Sep 2006	From what I can tell, DX6 is JR through HH.

10-07-2006, 12:12 PM	#8 (permalink)
bluemooone Join Date: Jul 2006	They just want to spread spektrum envy!

10-07-2006, 02:21 PM	#10 (permalink)
captcasper7 Registered Users My HF Map location Join Date: Aug 2006	I run the DX6 and I have no problems at all Mike __________________ Trex 600N Pro Trex 600N Sport Knight 3D

10-07-2006, 02:29 PM	#11 (permalink)
redgiki Registered Users Join Date: Jul 2006	The signal wire on the Spektrum puts out 3.3 volts, rather than the usual 5 volts. There has been online speculation about this (since it's unusual, though not unheard of), and people misunderstanding the difference between the signal wire and the power wires don't know enough to know the difference. These are probably the same guys who advocate reversing your servo by switching polarities on the servo wires. Your servos are still getting 5 or 6 volts to the motor (depending on your setup), and they'll work fine. The signal circuitry in your servos doesn't even need 3.3 volts to be effective. Some people thought this might be the reason that HS-65's respond a little slower on CCPM setups using the Spektrum, but it's become apparent that the problem is something to do with the programming of CCPM mode on the Spektrum transmitter itself. Helis which use mechanical mixing show no sign of such sluggishness, regardless of servo brand used. It's purely a CCPM thing, and virtually unnoticeable to those who haven't flown on high-resolution helis before. __________________ Fly Cheap. Fly Hard. Fly Daily.

10-08-2006, 06:58 PM	#12 (permalink)
bmlasater Registered Users Join Date: Jun 2006	fwiw... Seems all the dss chips like 3v. the tx actually runs the rf board on 3.3...That's the reason the Spektrum sucks batt power...An upgrade is available, do a search for "Spektrum switching regulator." John.

10-08-2006, 11:08 PM	#14 (permalink)
kgfly HF Support My HF Map location Join Date: Jun 2006	Yup, I run DX6 with HS-65MG on a TrexSE and no problems at all. BTW there have been several posts over on RCG about a Spektrum demo last weekend of a new high end Tx flying a large scale turbine jet. No more details so far. Looks like gen2 is almost here... __________________ Kenneth * MSH Protos Stock motor/15t/Align75/Align DS510/GL730+DS520/7s A123 2300 * TRex450CF/430L/12t/CC45/HS65mg/L2100T/KP 3s 2200 25C or 4S LiFe Previous rides: HX242, W5-4, TRex450(HDE), TRex450(SE), QJ-EP8v2, BCX2 ,Logo10, Hurricane550 SIM: Phoenix (previously also Reflex/XTR, ClearView, RF, FMS)

10-09-2006, 12:56 AM	#16 (permalink)
oscillator Registered Users Join Date: Sep 2006	I can confirm there will be an announcement at iHobbyExpo. Will be significantly upgraded from the DX6 - 5 point curves, nicer gimbals, big display area, and seven channels (I know, 9 would have been better). Got to play with it a little and it was sweet. Can't wait. __________________ ---------- Mark Scrivener San Jose, CA http://www.hoverimaging.com

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