[NSRCA-discussion] Futaba R6014FS Receivers

[Ed Alt]

I don't know what their limit is, but I did just scope the output of a Spektrum R921 and it's a 3.4V pulse on an unloaded channel.  A lot of this can depend on lead length and drive capability of the channel output, so 3.4V from a R921 or 2.7V from a R6014S becomes something less at the servo input.  I still have an R955, but I can't measure it since I no longer have a PCM Tx (it's for sale too - cheap!).

Ed
  ----- Original Message ----- 
  From: John Pavlick 
  To: General pattern discussion 
  Sent: Saturday, November 22, 2008 1:36 AM
  Subject: Re: [NSRCA-discussion] Futaba R6014FS Receivers


  Ed,
   What do the typical JR servos that we use in Pattern planes (8411, 9411, etc.) like to see? I want to use them with my Futaba 5114 (PCM - G3, 72 Mhz) receivers. I'll check the signal levels on the receivers this weekend.

  John Pavlick
  http://www.idseng.com
    ----- Original Message ----- 
    From: Ed Alt 
    To: bob at toprudder.com ; General pattern discussion 
    Sent: Saturday, November 22, 2008 12:00 AM
    Subject: Re: [NSRCA-discussion] Futaba R6014FS Receivers


    Aside from using a purpose built servo that matches logic families with the receiver, the only real solution is to insert a level translater in between; basically a simple buffer that allows you to take a lower voltage ourput signal from one logic family in the receiver and boost the signal level to work with a servo that requires higher levels for safe operating margins.  Personally, I would not fly other servos without doing this, even if they seem to be working fine.   Jim Oddino's post  used two very instructive words:  "ragged edge".   

    Ed
      ----- Original Message ----- 
      From: Bob Richards 
      To: General pattern discussion 
      Sent: Friday, November 21, 2008 9:42 PM
      Subject: Re: [NSRCA-discussion] Futaba R6014FS Receivers


            I think I read somewhere that the R608FS receiver uses the same chipset and has the same problem.

            So far I have not had any problems with the servos that I use, but I was not able to check the pulse width out of the higher channels with my Hitec programmer. I have to wonder, however, exactly what is the logic level for the various servos? Also, does the logic level of the servo change with a different battery voltage? Does the output level from the rx change with a different battery voltage?

            I guess this is a good reason to use some sort of output conditioner (powerbox, etc) if mixing brands of receivers and servos.

            Bob R.


            --- On Fri, 11/21/08, MKMSG <mkmsg at cox.net> wrote:

              From: MKMSG <mkmsg at cox.net>
              Subject: [NSRCA-discussion] Futaba R6014FS Receivers
              To: "NSRCA Discussion List" <nsrca-discussion at lists.nsrca.org>
              Date: Friday, November 21, 2008, 1:15 AM


              I was reading the FAQ section of the Futaba website when a particular item caught my eye regarding the R6014FS 2.4 receiver.  The FAQ states that the use of non Futaba digital servos with the R6014FS receiver may be problematic due to the 6014's lower output voltage of 2.7 volts.  Since I do occasionally mix and match Futaba and JR servos and use the 8 channel 2.4 receiver, I wondered if this issue was common to all Futaba 2.4 receivers.  Here's Futaba's answer: "The FAQ refers only to the R6014FS receiver, this is the only one that has the lower voltage."  Just thought I'd pass this along in case someone experiences performance anomalies with the 6014 receivers using other than Futaba servos.

              Mike
              NSRCA 35


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