[NSRCA-discussion] Spektrum AR9100 RX

Sat Feb 16 05:09:27 AKST 2008

Vince:
It's a near certainty that they designed it to isolate the battery inputs with separate, redundant FETs to switch them on/off, beause if they did not,  it would most likely mean that the batteries would be sharing a common internal bus.  You can get away with that with NiCad, NiMH packs and also with LiPo's that happen to be evenly matched and evenly charged.  However, it's a bad idea with LiPos because there is too much of a chance that someone would make a mistake and "poof".  So even without opening one up or drilling a Horizon tech for details, it's a pretty safe bet that they've got isolated inputs that also provide switching redundancy.  

I plan to get one at some time soon and I can figure it out without even opening it up.  I don't expect any issues.

Ed

From: vicenterc at comcast.netTo: nsrca-discussion at lists.nsrca.org; nsrca-discussion at lists.nsrca.orgCC: ed_alt at hotmail.comSubject: Re: [NSRCA-discussion] Spektrum AR9100 RXDate: Sat, 16 Feb 2008 13:29:29 +0000
Ed,

You just asked the question that I wanted to ask.   How this RX handle one battery failure?  I think the premium cost will make sense if this RX really has that feature already as you described (plus the soft switch).  I think we could save a lot of weight replacing the heavy duty pig tails and use this RX for pattern.  The information in the web site is not clear to me.  Probably Troy can help us to find this information using his contacts.

--Vicente "Vince" Bortone

-------------- Original message -------------- From: Ed Alt <ed_alt at hotmail.com> 

Vince: Receivers usually have their own voltage regulation for the receiver / decoder circuitry, but pass the voltage level at the input directly to the bus that the servos are on.  The main difference with the AR9100 re. power management is that has a much more robust connector system to handle high current loads, and ofcourse it has a softwitch.  That amounts to adding a power FET(s) of some type that's controlled by the on / off switch.  Having never seen one (yet), I would hope and assume that they have at least a pair of FETs feeding a common output bus, one each for each battery input so that if one fails, things keep running on #2.   The thing is, for Pattern applications, you already have a dual regulator arrangement that does what you need.  The AR9100 adds no particular advantage and as Troy points out, it's bigger & heavier than it needs to be.  For a large gasser with a dozen or so thirsty servos, it's a g ood idea.  This is mainly because it eliminates the "choke point" current limitation of the standard servo connectors that other receivers have for bettery connections. Ed

From: vicenterc at comcast.netTo: nsrca-discussion at lists.nsrca.orgDate: Sat, 16 Feb 2008 12:39:28 +0000Subject: Re: [NSRCA-discussion] Spektrum AR9100 RX
Troy,

The reason I would like to try the AR9100 RX in my pattern planes is that I am using two LiPo 910 mah now.  I like the idea to have a backup battery.  Yes, I will need to use a regulator because of the servos but it appears that the RX does not need regulator.  I know that I don't need the heavy wire for the application.  It will be nice that they make one with JR/FUB plugs. 

I was thinking that I can replace the wire with pig tails my self.  For sure I will go ahead and get one AR9100 for my big gasser.

What is the difference between 921 and the 9000?  I guess is just brand-name but want to make sure before investing.

Thanks,

--Vicente "Vince" Bortone

-------------- Original message -------------- From: "Troy A. Newman" <troy_newman at msn.com> 

Vince,

the 9100 RX is designed around High current draw applications. Our models don't really require that. The RX is heavier than the 921 or 9000 RX's and part of that is the large battery leads serving the RX. I suppose you could use it but you are not going to be gaining much. Its designed around the larger applications that are 33% plus or in things like Jets with a large number of servos with higher stress applications.

Our pattern models are drawing power in the 1.5-2amps max...this is peak and worst case usually. I have done some testing to make sure I'm carrying a good battery supply. Using a 1650nimh or 2300nimh on 4.8V is working for me in even the Bipes...Another good solution is the Jaccio regulator with a lipo or Li-ion at about 2000-2400mah capacity....

The 9100 RX is designed around models that might be using (5-6) 8711 servos or even more...and could be pulling upwards of 2-3-4amps or more.

At these currents and loads the normal RX switch and lead from a switch to the RX is not sufficient to carry these high currents for very long....so the 9100 RX is a solution to this application as it has large 16ga wire leads for power into the RX. This adds benefit in the high current applications but not really anything to our pattern models...other than weight.

I'm flying the 9000 and 921 in all my models now. Would not go any other way.

Troy Newman
Team JR

----- Original Message ----- 
From: vicenterc at comcast.net 
To: NSRCA 
Sent: Friday, February 15, 2008 6:04 PM
Subject: [NSRCA-discussion] Spektrum AR9100 RX

Hello all,Just would like to know opinions on this product. Any one using it? I like the idea of the two batteries input and the soft switch.http://www.horizonhobby.com/Products/Default.aspx?ProdID=SPMAR9100Thanks,--Vicente "Vince" Bortone

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--Forwarded Message Attachment--From: ed_alt at hotmail.comTo: nsrca-discussion at lists.nsrca.orgSubject: Re: [NSRCA-discussion] Spektrum AR9100 RXDate: Sat, 16 Feb 2008 13:07:31 +0000_______________________________________________NSRCA-discussion mailing listNSRCA-discussion at lists.nsrca.orghttp://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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