<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'><P>Jim,</P>
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<P>I don't know anything about electronics. I am sure that the following question if very simple for you: Why the digital servos are called digital?</P>
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<P>Thanks,</P>
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<P>Vicente "Vince" Bortone</P>
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<P><BR>----- Original Message -----<BR>From: "James Oddino" <joddino@socal.rr.com><BR>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><BR>Sent: Tuesday, June 23, 2009 12:12:23 AM GMT -06:00 US/Canada Central<BR>Subject: Re: [NSRCA-discussion] Servo Signals<BR><BR>What do they say in the Capital 1 commercials, not literally? Transmitters communicate with receivers digitally in PCM mode and analog in PPM mode. Receivers communicate with servos analogy (?) with PWM. The servos are analog.</P>
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<DIV>Jim O</DIV>
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<DIV>On Jun 20, 2009, at 7:23 PM, Bob Richards wrote:</DIV><BR class=Apple-interchange-newline>
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<TD vAlign=top>--- On<SPAN class=Apple-converted-space> </SPAN><B>Sat, 6/20/09, Richard Lewis<SPAN class=Apple-converted-space> </SPAN><I><<A href="mailto:humptybump@sbcglobal.net" target=_blank>humptybump@sbcglobal.net</A>></I></B><SPAN class=Apple-converted-space> </SPAN>wrote:<BR>
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<DIV>And....Interestingly enough.....It does not matter what kind of fancy whopping digital super latest and greatest TX/RX system you have, the signals to the servos are still firmly rooted in good old 1970's technology....:) And...Your super whopper digital brushless whatever servo still has an analog pot for position feedback....:)</DIV>
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<DIV>I for one am eager to see a leap in servo technology.....Bidirectional serial comms to the servos with the servo being able to feed back torque, amps, position, rate, etc.....and encoder/resolver position feedback in the servos to really catch up with the world we live in......</DIV>
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<DIV>Amen to that. We have digital servos and digital receivers, yet they talk to each other via an analog method and use analog feedback.</DIV>
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