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Pos shift receiver ?

Old 06-08-2011, 04:29 PM
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cvint
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Default Pos shift receiver ?

Can a pos shift receiver be converted to neg shift ?
Old 06-08-2011, 05:45 PM
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K-Bob
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Default RE: Pos shift receiver ?

Hitec made one a while back but as far as I know it was the only one. You simply moved a jumper.
Old 06-08-2011, 05:46 PM
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baronbrian
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Default RE: Pos shift receiver ?

The simple answer is no. Futaba and Hitec are neg. shift, JR and Airtronics are positive shift. hitec also made receivers for jr and airtronics radios that were pos. shift. I also believe that hitec made a module for their module based radios that let you select the shift (along with channel); and DAD (out of business) made rx's that would accept both the signals from positive or negative shift transmitters.
Old 06-08-2011, 06:40 PM
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A.T.
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Default RE: Pos shift receiver ?


ORIGINAL: cvint Can a pos shift receiver be converted to neg shift ?
Many of the older fixed shift receivers can be changed Pos<>Negative,
but unlessgood at DIYnot considered cost effective as many of the older receivers' components
would by now be degraded. e.g.
<dt>GWS - Convert Positive shift RX to Negative Shift and Negative shift to Positive.

and cheaper to upgrade, all current Hitec PPM receivers are Auto Shift (have been for some time).

more relating to "Shift" for both RX&TX conversions under
"Radio Systems, Accessories, Alterations and FAQ." at:
Alan's Hobby, Model & RC FAQ Web Links



Alan T.

</dt>
Old 06-08-2011, 07:11 PM
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fizzwater2
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Default RE: Pos shift receiver ?

The jr sport600 is also a nice shift changeable receiver. Not auto shift, but selectable
Old 06-09-2011, 06:36 AM
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Rodney
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Default RE: Pos shift receiver ?

Yes, some receivers can be "shift selectable" and there is at least one which automatically selects the shift. I do not recall the brand but it may have been Corona. However most are not. In most of the world, all receivers are positive shift including Hitec and Futaba which (in the USA) are negative shift receivers.
Old 06-09-2011, 06:43 AM
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BuschBarber
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Default RE: Pos shift receiver ?


ORIGINAL: Rodney

Yes, some receivers can be ''shift selectable'' and there is at least one which automatically selects the shift. I do not recall the brand but it may have been Corona. However most are not. In most of the world, all receivers are positive shift including Hitec and Futaba which (in the USA) are negative shift receivers.
JR/Spektrum are the opposite of Hitec and Futaba.

Hitec and Futaba require you to go Negative, when setting Expo for a Soft Neutral. That is how I remember they are Negative Shift.

JR/Spektrum require you to to Positive, when setting Expo for a Soft Neutral. That is what reminds me that they are Positive Shift.

In 72Mhz, Hitec used to offer both Positive or Negative shift versions of their receivers and then they went to AutoShift.
Old 06-09-2011, 07:23 AM
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fizzwater2
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Default RE: Pos shift receiver ?

I don't believe Spektrum ever made a 72MHz FM receiver.

Airtronics used the same shift as JR, if I remember correctly.
Old 06-09-2011, 07:37 AM
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BuschBarber
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Default RE: Pos shift receiver ?


ORIGINAL: fizzwater2

I don't believe Spektrum ever made a 72MHz FM receiver.

Airtronics used the same shift as JR, if I remember correctly.
You are of course correct regarding Spectrum being 2.4 only. I tend to refer to JR and Spektrum as the same animal because in every other respect, they are.

I have had JR and Futaba for many years. JR uses Positive Shift and Futaba/Hitec uses Negative Shift.

On 72Mhz, both Hitec and Futaba are Cross Compatible, except for PCM.
Old 06-09-2011, 09:35 AM
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fizzwater2
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Default RE: Pos shift receiver ?

LOL wouldnt it be nice if someday everyones tx would work with anyones rx, and do it in such a fashion that hunfreds of them could be working independently of each other? Pretty tall order i would imagine
Old 06-09-2011, 09:53 AM
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BuschBarber
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Default RE: Pos shift receiver ?


ORIGINAL: fizzwater2

LOL wouldnt it be nice if someday everyones tx would work with anyones rx, and do it in such a fashion that hunfreds of them could be working independently of each other? Pretty tall order i would imagine
Nice thought!!
Old 06-09-2011, 10:03 AM
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fizzwater2
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Default RE: Pos shift receiver ?

Kind of like - Good, Fast, Cheap - pick which two you want.

Old 06-09-2011, 10:09 AM
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BuschBarber
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Default RE: Pos shift receiver ?

Absolutely!!
Old 06-09-2011, 01:04 PM
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A.T.
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Default RE: Pos shift receiver ?


ORIGINAL: fizzwater2 LOL wouldnt it be nice if someday everyones tx would work with anyones rx, and do it in such a fashion that hunfreds of them could be working independently of each other? Pretty tall order i would imagine
As in post #4
"Many of the older fixed shift receivers can be changed Pos<>Negative,
but unlessgood at DIYnot considered cost effective as many of the older receivers' components
would by now be degraded. e.g.
<dt>GWS - Convert Positive shift RX to Negative Shift and Negative shift to Positive."

all current Hitec PPM receivers are Auto Shift (have been for some time).

HitecPrism 7X, Eclipse 7,Optic &Aurora TXand a few Sanwa (aka Airtronics) are all shift selectable.

JR&Futaba are easily converted POS<>NEG as user desires

</dt><dt>How to make a JR Radio to work with Futaba RX.
In need theaton56 aka 'MacMan" may be able to assist with current schematic.

The PPM-Signal-Inverter section 2.2

Futaba - Signal Inverter. Change from Negative Shift to Positive Shift</dt><dt>
One easy schematic attached with more relating to "Shift" for both RX&TX conversions under
"Radio Systems, Accessories, Alterations and FAQ." at:
Alan's Hobby, Model & RC FAQ Web Links

Alan T.

</dt>
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Old 06-09-2011, 01:24 PM
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A.T.
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Default RE: Pos shift receiver ?


ORIGINAL: Rodney Yes, some receivers can be "shift selectable" and there is at least one which automatically selects the shift. I do not recall the brand but it may have been Corona. However most are not. In most of the world, all receivers are positive shift including Hitec and Futaba which (in the USA) are negative shift receivers.
all receivers are positive shift including Hitec and Futaba - Negative

<dt>Receiver - Negative or Positive Shift?

Transmitters - Negative or positive shift?
"Regardless of frequency, all shift select TX are to be set on "SFT.N" i.e. 35 Mhz, 36 Mhz, 40 Mhz & 41 Mhz except when used with JR or Sanwa(Airtronics) RX operating on 72Mhz and 75 Mhz. Reference in need, "Transmit Shift SFT.N SFT.P" Eclipse manual page 11 download manual .pdf ."
and as attached.

Alan T.
Alan's Hobby, Model & RC FAQ Web Links
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Old 06-09-2011, 03:38 PM
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wesaysoracing
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Default RE: Pos shift receiver ?

if i remember right my airtronics RD8000 transmitter will let me shift it

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