[NSRCA-discussion] Analog Servo RF Masking and....Thanks!

[John Ferrell]

I have seen this kind of "Twilight Zone" ( I really like that term!) failure in industrial products. The problem is probably present in the Analog setup but the system is not fast enough for it to show.

If the digital servos are trying to latch up on the leading edge of a signal shift they may simply be following switching transients.

I seem to recall a condition where Jr had a filter across the signal at the reciever and Futaba had a filter across the signal at the servo. Since it always seemed to work OK  so the condition was ignored. May be that the filter has become essential. I suppose that we may have reached the point in time that we can no longer ignore the differences in the two systems. 

I have used mixed systems but I have never been comfortable ignoring any engineer's specfications.

When you mix the two systems it is a hack and you become the test pilot...

BTW, my guess is that the glitch can be fixed with a capacitor (100pf?) across the signal at the servo end. But then it might just make it worse!

John Ferrell    W8CCW
"My Competition is not my enemy"
http://DixieNC.US

  ----- Original Message ----- 
  From: John Pavlick 
  To: NSRCA Mailing List 
  Sent: Tuesday, July 04, 2006 7:07 PM
  Subject: Re: [NSRCA-discussion] Analog Servo RF Masking and....Thanks!


  Scott A.: Yeah, a possibility - but he says it works OK with the analog servos. It would be worth checking, but if he has another Rx he could just substitute that (probably already did) and see if the problem goes away. Scott P.: Does moving the antenna change anything? You have to find the common denominator. If it's not the Rx then maybe it has something to do with the installation. There is something going on there and I'm not sure why the digital servos make it more apparent. Find someone who knows how to use a 'scope and see if they can help you. This is weird - you guys have the same first name and my last name looks like yours. Maybe we're all stuck in the Twilight Zone...

  John Pavlick
  http://www.idseng.com
    

    -----Original Message-----
    From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Scott Anderson
    Sent: Tuesday, July 04, 2006 6:47 PM
    To: NSRCA Mailing List
    Subject: Re: [NSRCA-discussion] Analog Servo RF Masking and....Thanks!


    Hi Scott,

    Stupid question, did you send RX out and have it put on a shaker table and checked.. I had a RX issue for over a month and spent time with Tony S. and he found a bad filter on the board.. 

    Just my 2 cents from a fellow team member..

    Scott Anderson
      ----- Original Message ----- 
      From: Scott Pavlock 
      To: NSRCA Mailing List 
      Sent: Tuesday, July 04, 2006 6:29 PM
      Subject: Re: [NSRCA-discussion] Analog Servo RF Masking and....Thanks!


      I've used multiple battery set ups including ones without a regulator on a normal NiCd pack, and also on both a 5.6v regulator and a 6v regulator.

      John,

      No I don't. I actually have no clue what that is haha.

      /nsrca-discussion


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