[NSRCA-discussion] Expert Electronics' F650 Negative shift RX
John Pavlick
jpavlick at idseng.com
Wed Jan 31 18:31:39 AKST 2007
Jim,
Yeah my 9Z with a synth. module doesn't work with some of the Bergs either. With a fixed frequency module it works fine. I never did dig into it to find out why since I have a 9C w/synth. module that talks to the Bergs just fine. Interestingly enough my 9Z did attempt to talk to positive shift Rx at one time! I was setting up a review airplane and I didn't notice that the Rx they gave me was positive shift. It actually worked (I think the center points were way off though) but one of the channels - I think CH6 didn't work. Weird. I figured it out eventually (look at the box dummy!) but for a while it was interesting...
John Pavlick
http://www.idseng.com
----- Original Message -----
From: J.Oddino
To: NSRCA Mailing List
Sent: Wednesday, January 31, 2007 8:32 PM
Subject: Re: [NSRCA-discussion] Expert Electronics' F650 Negative shift RX
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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