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Knowledge base ds760 Servo
Knowledge base Quark Servo

Question #12
My servo is not listed in the user guide. Which mode should I use?
Answer

First of all please check if your servo is listed on our servo selection table by clicking [here].

The most reliable way of determining the correct parameters is to seek advice from the servo manufacturer or their representatives. When Spartan RC has such reliable information about a servo, either from the servo manufacturer or through in-house testing it will be included in our servo selection table.

Unfortunately most servo manufacturers don't include in the specification the maximum control pulse frame rate that their servos are capable of and with so much choice on the market it is impossible for us to purchase and characterise them all. We do however try to keep our list updated with the most popular tail servo choices.

If your servo is not listed on our table it means that we do not have confirmed specification about its capabilities. As such we can't make a recommendation on what settings to use. You may wish to follow the general advice we list below, but please do so at your own risk and pay particular attention to the warning notes.

• Other than the few exceptions listed below the majority of modern digital servos will happily work at 1520uSec/333Hz.

• The narrow pulse servos such as Futaba S9251/S9256/BLS251 and MKS DS8910 are usually clearly advertised by their manufacturer as narrow pulse and should be used with the 760uSec pulse mode.

• The Logictech servos and Hitec 5083MG have a non standard neutral pulse width of 960uSec. The Logictech servos we tested were capable of 333Hz.

• The Sky HDS-577, HDS-877 and perhaps other servos of that range are limited to 250Hz. They should therefore be used with the 1520uSec/250Hz mode.

• The old JR Super-Servos usually marked with the prefix NES- (810G, 2700G, 8700G) and perhaps other servos of similar age are limited to 250Hz. They should therefore be used with the 1520uSec/250Hz mode.

• The new range of JR digital servos often marked with the prefix DS- (8900G, 3400G) were found be capable of 333Hz. It is likely that other JR servos using this prefix can also be used in 1520uSec/333Hz mode.

• All Futaba digital servos that we tested were capable of accepting the 333Hz. Excluding the narrow pulse servos mentioned earlier all other Futaba digital servos will very likely work at 1520uSec/333Hz.

Additional notes:

• Servos that are capable of 333Hz will also happily run at 250Hz but not the other way round. If you are unsure about the maximum control pulse frame rate of your digital servo you may choose to run it at 250Hz.

• Even if the servo appears to be working ok you should check that it continues to do so throughout its travel range.

WARNING!

In certain cases use of the wrong uSec/Hz setting will cause the servo to travel to the end of its range and bind. If left unnoticed for several seconds the servo will very likely get damaged as a result of the binding and excessive current passing through the stalled motor. If the servo was left binding for more than a brief moment you should thoroughly test it and seek expert advice from the servo manufacturer before using it in flight.

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