[NSRCA-discussion] Expert Electronics' F650 Negative shift RX

[J.Oddino]

I don't know about the synth module compatibility.  That is probably a frequency shift direction issue.  I have a six meter 9Z and long ago I bought a DAD PPM receiver made by FMA and they had to do a major mod to it to make it work with the 9Z.  As I recall, if you look at the output of the discriminator you get the familiar series of control pulses going from zero to some voltage for about 300 microseconds with spacing of 1 to two milliseconds depending on stick position.  But then there is a long period, like seven milliseconds used to sync the decoder.  On most systems the voltage would be low, like the period between the pulses but with the 9Z transmitter the signal would be high like the peaks of the pulses.
My Berg, that came directly from Peter, worked and I don't recall telling him anything about the 9Z other than what channel it was on.  I assumed it figured out all the polarities and did what it needed to do.  I can't say why it wouldn't work with the synthesizer.

Jim O
  ----- Original Message ----- 
  From: MKMSG 
  To: NSRCA Mailing List 
  Sent: Wednesday, January 31, 2007 3:33 PM
  Subject: Re: [NSRCA-discussion] Expert Electronics' F650 Negative shift RX


  Jim:  Are you saying the 9Z with Synth module will work with the Berg DSP receivers?  When I asked Castle Creations, they said it would not.

  Mike M
    ----- Original Message ----- 
    From: J.Oddino 
    To: NSRCA Mailing List 
    Sent: Wednesday, January 31, 2007 5:09 PM
    Subject: Re: [NSRCA-discussion] Expert Electronics' F650 Negative shift RX


    I'm pretty sure it won't work.  The sync pulse is the wrong polarity with respect to the servo position pulses in the 9Z.  Just inverting it won't work.  I can't imagine why they did that.  Interestingly enough, the Berg receiver figured it out.

    Jim O
      ----- Original Message ----- 
      From: Dean Pappas 
      To: NSRCA Mailing List 
      Sent: Wednesday, January 31, 2007 2:11 PM
      Subject: Re: [NSRCA-discussion] Expert Electronics' F650 Negative shift RX


      Hello Incheol,
      I assume that the F650 does not work with the synthesized 9Z TX module.
      Try it with a non-synthesized module and it will almost certainly work.
      This would not be the first RX to show this "feature".
      I am told (though I have never tried this) that if you unplug then re-plug the 9Zsynthesizer module
      while the TX is powered up that those same  RX es will work with the 9ZS module.
      All the best,
      Dean

      Dean Pappas 
      Sr. Design Engineer 
      Kodeos Communications 
      111 Corporate Blvd. 
      South Plainfield, N.J. 07080 
      (908) 222-7817 phone 
      (908) 222-2392 fax 
      d.pappas at kodeos.com 

        -----Original Message-----
        From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Park, Ihncheol
        Sent: Wednesday, January 31, 2007 3:48 PM
        To: 'NSRCA Mailing List'
        Subject: [NSRCA-discussion] Expert Electronics' F650 Negative shift RX


        Has anyone tried Expert Electronics' F650 (Horizon part number EXRR6501) with Futaba or Hitec transmitter(s)?
        This is JR Propo's R610 receiver in negative shift.  Very good and cheap receiver.

        So far, it works good with Hitec Eclipse.  It does not work with Futaba 9Z on PPM.
        Apparently Horizon did not know until today that this receiver does not work with 9Z.
        If anyone tried them, would you please let me know?
        Thank you,

        Ihncheol Park
        P & A Hobbies


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