Buffer-Amplified Servo Extensions Required?
06-12-2010, 04:23 AM
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Buffer-Amplified Servo Extensions Required?
I'll be using some long 48" and 36" extensions connected to a powerbox evolution which has its own signal amplification for a 1/8scale F16 and... are Buffer-Amplified Extensions and Harnesses required? Or just a nice to thing to have?
Will normal 22awg wire extensions be ok to use? Twisted cables? The technicalities of signal amplification etc.. etc... still escape me.
Thanks in advance!
Rob
Will normal 22awg wire extensions be ok to use? Twisted cables? The technicalities of signal amplification etc.. etc... still escape me.
Thanks in advance!
Rob
06-12-2010, 11:56 AM
#2
RE: Buffer-Amplified Servo Extensions Required?
I've been using 48" and 36" extensions in many airplanes and 6' to 8' extensions in UAV's without buffer extensions all the time - just a Powerbox type buffer (I use Smartfly) at the RX. I think buffered extensions are not only unnecessary (in most applications), but are just added complexity that reduces overall reliability...
Bob
Bob
Thanks Again!
06-13-2010, 04:48 AM
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RE: Buffer-Amplified Servo Extensions Required?
Bob, The futaba 14 rx's have AND gate cmos buffers after the RX micro output, with a low impedance RC filter. Amplitude about 3.3V. On the spektrum/JR there is only a 1K series resistor direct from micro output pin. Probably the reason why some folks are having issues with long leads on Spektrum. So the line impedance on the JR/Spektrum is rather high. I would say buffers are a good option in that case...
Andre
Andre
ORIGINAL: rhklenke
I've been using 48" and 36" extensions in many airplanes and 6' to 8' extensions in UAV's without buffer extensions all the time - just a Powerbox type buffer (I use Smartfly) at the RX. I think buffered extensions are not only unnecessary (in most applications), but are just added complexity that reduces overall reliability...
Bob
I've been using 48" and 36" extensions in many airplanes and 6' to 8' extensions in UAV's without buffer extensions all the time - just a Powerbox type buffer (I use Smartfly) at the RX. I think buffered extensions are not only unnecessary (in most applications), but are just added complexity that reduces overall reliability...
Bob
06-13-2010, 02:58 PM
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RE: Buffer-Amplified Servo Extensions Required?
Specific to JR/Spektrum buffer Y leads. Other brands should work. After all they are designed to improve the signal, not destroy it. The JR/Spektrum version was obviously a faulty design....
ORIGINAL: Wclays
I found the service bullentin that JR posted
http://www.jrradios.com/Articles/Art...97&tag=hwn2011
I found the service bullentin that JR posted
http://www.jrradios.com/Articles/Art...97&tag=hwn2011
06-13-2010, 04:56 PM
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RE: Buffer-Amplified Servo Extensions Required?
I recently had a problem with my Spektrum in my MB 339 on the rudder servo. It would oscillate around center. It did NOT do this with XPS or on 72 Mhz, just with Spectrum. Once i put a buffered extension in it cured the problem right away.
Just my 2 cents...
Just my 2 cents...
