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HelicopterBeginners Corner › 2.4 ghz receivers: 2 piece vs. 1 piece
06-05-2010 12:33 AM  7 years agoPost 1
Thx1326

rrNovice

St. Louis, MO USA

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Two questions here:

1. I notice some 2.4ghz systems have a single piece receiver and some have a two piece. What's the differences and advantage or disadvantage of one over the other.

2. How do you set up fail safe mode? Is this an actual setting in the TX?

Thanks

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06-05-2010 12:40 AM  7 years agoPost 2
Solmanbandit

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Tucson , AZ

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I know what you are talking about, you are talking about a receiver with a satellite. It is basically acts as a back up to ensure a solid signal. You can still have fades, but those don't happen too much. Fail safe setup happens when you bind. It all depends on when you pull the bind plug out.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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06-05-2010 04:13 PM  7 years agoPost 3
Thx1326

rrNovice

St. Louis, MO USA

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2 pc vs. 1 pc Receiver

Thanks for the response but the question still remains unanswered:

What are the advantages or disadvantages of a 2 pc (Receiver with Satellite) vs a 1 pc Receiver. Obviously the 2 pc will probably add a few more ounces of weight and take up more space but does it have an actual advantage?

Or is a one piece properly designed receiver with the longer antenna coiled out along the tail boom supports - just as good?

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06-06-2010 12:39 AM  7 years agoPost 4
Solmanbandit

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Tucson , AZ

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It is basically suppose to decrease the possibility of losing a single and crashing. I don't have a satellite receiver on any of mine and have never had a problem that I know of.

Trex 700E / Trex 500 ESP - Ikon/ HD 500 - Ikon 2/ Goblin 500 Ikon 2

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06-06-2010 12:39 AM  7 years agoPost 5
dkshema

rrMaster

Cedar Rapids, IA

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You would be referring most likely to the difference between the Futaba FASST receivers, and the JR/Spektrum 2.4 GHz receivers.

In short, BOTH designs work well.

Not all Spektrum receivers have or use the satellite receivers, however. The 5 and some 6-channel versions do not use an external satellite. The 5-channel Spektrum RX is a full-range receiver, the Spektrum 6-channel receivers using no additional satellite are shorter-range "park flyer" receivers, though that "shorter" range is still plenty to fly a 250/450 sized heli.

The JR/Spektrum receivers that utilize external satellites allow you to place those additional receivers at different locations around your aircraft to improve signal reception coverage. 2.4 GHz systems are high-enough frequency that the signal becomes very directional, and if something (including your airframe) comes between the transmitter and your receiver, there is a high probability that the "shadowed" receiver may not "see" the transmitted signal at all, or the signal may be greatly attenuated to the point that it is useless. Having the ability to place additional receivers at different points in your airframe helps to eliminate those blind spots and assures more reliable signal reception.

The Futaba style receivers usually have two separate antennas (those long coaxial wire leads) and those need to be located at different points around your airframe, so that they, too, will allow at least one to "see" the transmitted signal.

I don't believe that one technical approach is better than the other, they both have performed well since their introduction.

-----

With either style receiver, the receiver is initially "trained" by you (the user) to listen ONLY to YOUR transmitter. The receivers use a technology similar to that used in network routers and your PC. Your transmitter sends out a unique identifier code along with its transmitted signal. That identifier is unique to that transmitter, no two transmitters have the same ID. When you "bind" (or train) your receiver to your transmitter, you are essentially telling the receiver to only listen to signals with your transmitter's embedded ID code.

During the process of binding, you also end up setting the failsafe positions that your receiver will drive the servos to, in the event of a momentary signal loss.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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06-06-2010 02:36 AM  7 years agoPost 6
Heli0228

rrApprentice

Ripplemead, Va

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Receivers

Do not look at them as one or two peices. Look at a receiver as a Park flyer or Full range. If you have a big area to fly in then go with Full Range ir you only fly in a park and do not get far away from the radio then get Park Flyer. Read the range limits for each and then pick the one you need, or call Customer Service.

Fail safe is what setting the model goes to when the radio is off or loses contact with the reciever. Before the bind process set the throttle trim so the engine is at an idle or what you think would be idle "about half trim", then bind the radio to the receiver, now if you lose radio function the model will go to engine idle NOT full throttle and hurt some one. The first thing you need to do is go find a flying field and get some help from some experienced pilots, this will help you alot.

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06-06-2010 06:48 AM  7 years agoPost 7
chopper_crazy

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Delphos, Ohio

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I always look at the satellite receiver as extra insurance just in case. In fact, on some of my more expensive machines, I run two satellite receivers just for piece of mind.

It's a complex, costly, glow powered anti-gravity machine!

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