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Old 08-09-2007, 07:52 PM   #1
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Default Futaba s9550 Question

I have a Futaba PJ series radio and I am using a s9550 servo. My question is do I need a PK series radio to get the full potential from the servo. ie, the full speed and torque from the servo. The servo seems to be sluggish. Any help would be appreciated.
Thanks in advance!
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Old 08-09-2007, 08:03 PM   #2
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How is the servo powered? Is it done by the main battery or by a separate battery pack for the receiver?

I don't know much about Futaba receiver models, the S9550 is supposed to work at its best with either FM or Spektrum radios. If you are using AM, or if there is not enough power going to it, then it will run like a dog.
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Old 08-09-2007, 10:05 PM   #3
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The servo is powered threw my receiver. I'm using a Novak receiver and a Novak GTB, no external battery pack.
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Old 08-10-2007, 01:24 AM   #4
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I think only restriction you have on futaba instructions is to not use it with AM radios... so I would check first if the servo gearing is running free (not internal binding), as with the GTB you shouldn't have any problems as it has 6V and at least 1A... check all connections, centre point and end points, making sure the servo can run both sides OK.
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Old 08-10-2007, 07:58 AM   #5
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What's up with not running the servo with an AM radio??? I do so and everything seems to be ok....no prob so far....
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Old 08-10-2007, 08:15 AM   #6
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Quote:
Originally Posted by rampal View Post
I think only restriction you have on futaba instructions is to not use it with AM radios..
is that true? i know that a digital servo is required when using hrs (high response) systems due the frame rate and whatnot, but i've not heard anything negative about the use of digital servos with am radios.

further, i don't believe the receiver type to regulate the voltage or current of the signal going to the receiver. most bec specs are defined by the esc's ability to provide those (v,i). and most esc's are rated between 5.6-6.0v output to the receiver.

here's some additional literature that could help. sort of, i would have guessed futaba to insert a caveat if this technology could not be used with am radios.
Attached Files
File Type: pdf digitalservos.pdf (244.1 KB, 85 views)
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Old 08-10-2007, 08:31 AM   #7
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Quote:
Originally Posted by seaball View Post
is that true? i know that a digital servo is required when using hrs (high response) systems due the frame rate and whatnot, but i've not heard anything negative about the use of digital servos with am radios.

further, i don't believe the receiver type to regulate the voltage or current of the signal going to the receiver. most bec specs are defined by the esc's ability to provide those (v,i). and most esc's are rated between 5.6-6.0v output to the receiver.

here's some additional literature that could help. sort of, i would have guessed futaba to insert a caveat if this technology could not be used with am radios.
this is what it says on their documentation... there's a list of their radios which they don't reccomend as well.... I've used the s9550 with a 2PL with no problems, the only thing is that you don't get the "full performance" available...

if you run HRS, yes, digital servos are a must.

cheers,
al
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Old 08-11-2007, 02:40 PM   #8
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According to the Futaba website, the 9550 can't be used with *some* AM radios.

"This digital servo cannot be used with the following * AM *
transmitters as the servo neutral signal is: 1310us).
CONQUEST AM, FG Series (T4FG, T5FGK,T6FG, T6FGK, T7FGK), New Terratop,
T3EGX, T3PGE, T2NL, T2LGX, T2FR, T2PK series.
**** Otherwise they will work fine with current AM systems *****"
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Old 08-12-2007, 05:45 AM   #9
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Quote:
Originally Posted by CarbonJoe View Post
According to the Futaba website, the 9550 can't be used with *some* AM radios.

"This digital servo cannot be used with the following * AM *
transmitters as the servo neutral signal is: 1310us).
CONQUEST AM, FG Series (T4FG, T5FGK,T6FG, T6FGK, T7FGK), New Terratop,
T3EGX, T3PGE, T2NL, T2LGX, T2FR, T2PK series.
**** Otherwise they will work fine with current AM systems *****"
thank you. I was looking for exactly that quote.... that I've done myself some time ago.... http://www.rctech.net/forum/showpost...0&postcount=23

cheers,
al
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