[NSRCA-discussion] berg 7 channel Rx

[Fred Huber]

Max output torque of a servo is a function of battery supplied voltage, the motor in the servo and the gear ratio. 

Changing the signal line frequency will not alter the servo output torque.

Also.. max torque of a servo can sometimes be a GEAR TRAIN limit.  otherwise it would be impossible to strip a sevo gear in flight.  No change to the voltage supplied is going to alter the strength of the gears in the servo.

It may effectively increase the servo resolution and thus sensitivity to being off center, but it will not increase its available torque.

It MAY have the servo circuit apply more power at a smaller deviation from "demanded" position...  But that is an effect of resolution.

So.. it may apply full torque available at half the deviation from demanded position... (may be what you MEANT to say...)

Note that using a dual-inverter "glitch buster" http://www.uoguelph.ca/~antoon/gadgets/noiserx.htm (especially with Futabe 127 DF RX's) will boost the signal line from the RX output (appx 3.8 v for the Futaba 127 when using 4.8 v NiCd pack) to full RX pack voltage.  This can increase effective resolution. (especially with long servo leads)
The circuit is INTENDED to filter interference from long leads... and it works.  The side effect is almost as good as the intended purpose.

 If you can find the chip to make the circuit... I'm having trouble finding the DIP (.10 inch pin spacing) I got some .05 in pin spacing chips... which are going to be harder than heck to solder into the circuit, but should do the job.
  ----- Original Message ----- 
  From: Scott Pavlock 
  To: NSRCA Mailing List 
  Sent: Wednesday, September 13, 2006 4:59 PM
  Subject: Re: [NSRCA-discussion] berg 7 channel Rx


  {trimmed}
  The nice part about this is it gives the ability of any analog servo to output twice its normal torque. 
  {trimmed}

  Scott Pavlock


  On 9/13/06, White, Chris <chris at ssd.fsi.com> wrote:
    Hi Mike Mueller,

    Oops…I meant to imply "They seem to be okay in low cost electrics"J   I'm not ready to try a $50 receiver in a big-buck R/C application either…

    Chris




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    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of mike mueller
    Sent: Wednesday, September 13, 2006 1:44 PM
    To: NSRCA Mailing List
    Subject: Re: [NSRCA-discussion] berg 7 channel Rx



     I know that Castle took a long time to introduce them to the market. The initial designs that they had right after taking over Berg were not up to the standards they wanted. I'm really impressed with these and can't wait to try one. I'll also test them in a small IC plane before having confidence in a pattern plane. The people at Castle are top notch. It's also good to see an electronic component actually made here in the US. Mike

    "White, Chris" <chris at ssd.fsi.com> wrote: 

    Hi Mike,
    I know some foamie guys are using these and treat them like they are a
    standard.....They should be okay.
    Chris

    -----Original Message-----
    From: nsrca-discussion-bounces at lists.nsrca.org
    [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Michael
    Wickizer
    Sent: Wednesday, September 13, 2006 12:24 PM
    To: nsrca-discussion at lists.nsrca.org
    Subject: [NSRCA-discussion] berg 7 channel Rx

    Anybody have experience with these receivers? At only 8 grams, sure
    would 
    be a weight savings in electric applications.

    http://www.castlecreations.com/products/berg_7-channel.html

    Mike


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