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RE: 2.4 receivers - 12/30/2012 11:26 PM   
JohnBuckner



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quote:

ORIGINAL: gphil

What I was asking about the batteries, was will the regular battery for the Rx, Futaba ,  be sufficent to run the 2.4  receivers.
?  Staying power is what needed.    gphil



I advise aginst using the old five to seven hundred mah packs with 2.4 altogether. For 2.4 I would use nothing less than five cell packs and not less than perhaps 1600mah and even better 2000. This is for any brand 2.4 system.

Absolutely the most problems have been with the fellows not provideing suficient power for their 2.4 system what ever it is.

John

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RE: 2.4 receivers - 12/30/2012 11:39 PM   
AV8RJIM


 

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Status: offline 		Thank you, Do I have to program something in the radio or is it automatic. Again thanks

Jim

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RE: 2.4 receivers - 12/31/2012 12:36 AM   
eddieC



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Without running your system through an ammeter, you don't really know what demands are being placed on your rx battery. This is why some overkill on the battery is good. You can get an idea, after the fact, by monitoring the charge on a battery cycler. You'll be able to see how much a flying session took out. Try to stay within 70% of battery capacity to be safe. 


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RE: 2.4 receivers - 12/31/2012 12:47 AM   
JohnBuckner



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quote:

ORIGINAL: AV8RJIM

Thank you, Do I have to program something in the radio or is it automatic. Again thanks

Jim



Yes as Eddie said For Rx's you do not have to do anything to run five cell packs versus the old four cell packs. Actually I made the commitment to 6 volt packs and packs that are typically three times the capacity that we use to fly our old 72 systems with before I even made the change over to 2.4 (I no longer fly any 72).

Now for the Tx you will have to maintain whatever voltage is required for you system whatever that is but you can use batterys of higher capacity than what the stock units come with.

I recently completed a long cross country flight on water and for that since I use the Hitec system which on certain of their tx's are six cell packs and not the old eight cell packs I simply removed the internal pack altogether and ran a big old six cell car pack velcroed to the back of the tx. Yes with that radio lipos can be used but I choose to avoid the complexities of their use.

John

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RE: 2.4 receivers - 12/31/2012 3:50 AM   
eddieC



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Status: offline 		JB, at the risk of hijacking the thread, can you fill us in on the cross-country? Got a link if it's elsewhere? Sounds very cool.

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RE: 2.4 receivers - 12/31/2012 4:13 AM   
LSP972


 

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quote:

ORIGINAL:

Absolutely the most problems have been with the fellows not provideing suficient power for their 2.4 system what ever it is.

John


As a brand-newbie to 2.4, I was concerned about this as well. A long conversation with a very knowledgeable Hobby Services technician revealed that the "reset voltage" for Futaba FASST receivers is 3.7; if your battery voltage drops to that, or below, it WILL shut down/reboot.

He said, basically, that a six volt pack was minimum, with the more milliamp hours the better. In that light, using a small 4.8 pack would, IMO, be incredibly risky. That's not the adverb I would have normally chosen, but this is, after all, a family-friendly site...


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RE: 2.4 receivers - 12/31/2012 8:44 AM   
JohnBuckner



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quote:

ORIGINAL: eddieC

JB, at the risk of hijacking the thread, can you fill us in on the cross-country? Got a link if it's elsewhere? Sounds very cool.




Thanks eddie, here is the thread sorry its long:

http://www.rcuniverse.com/forum/m_11239869/mpage_1/key_/tm.htm

I was reecently waylayed right after that flight but out of the hospital now and starting to make sparks fly in my shop furiously for another attempt for the river flight next November and a summer flight over the open ocean from Long Beach to Avelon Catalina island.



LSP that technition is indeed knowledgeable. Most of the 2.4 majors will not directly say that 4 cell packs an not a good idea because that is not what the customers want to hear but do indeed tend to discourage the practice. Hitec seems to be most vocal about this in their manuals with strong implications.

John

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RE: 2.4 receivers - 12/31/2012 12:38 PM   
Rodney



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Status: offline 		I have to disagree with some of the above comments. I working in reliability in the electronics field for several decades and electronics are probably the most reliable type of components made. As long as you do not over voltage or drive to much current through them, they will essentially last forever. The cheaper receivers that you now can get can often be just as reliable as the most expensive ones. The problems will most often be in the workmanship such as soldering and conformal coatings. These can usually be detected by visual inspection. Capacitors, especially electrolytics can also be a problem as manufacturing/materials can be marginal. If the truth were know, many of the more expensive units are made by the same type of workers using the same components as the cheaper ones are when you talk about electronics made over seas. Yes, electronics is one of the areas where you can get high reliability at many different price ranges. Just because it is expensive does not make it more reliable nor does just because it is cheap make it unreliable.

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RE: 2.4 receivers - 12/31/2012 1:46 PM   
gwweber


 

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We hear a lot of talk about 2.4 radio issues. 
I have been flying for several years using a dx7 then a dx8 now a dx18.  I have never had an issue with brownouts or inexplicable crashes that can only be blamed on radio issues.  I have used a hobbyking reciever and it worked ok, but it was in a cheap park flier.   Dare say I would never use a knock off reciever in any of my good planes.  How many people at the field fly a 2.6 meter composite arf or a jet with junk for electronics.  
Get a grip, there are enough things to go wrong in an airplane and your responsibilty as a pilot includes the well being of other people in the area you fly in.  
We have a flier that insists on using orange recievers at our field, he has a much much higher accident rate and always finds oither reasons then his cheap recievers.  Oh yes, he uses old reciever packs and old servos too. 

My belief is that you have to build a plane and maintain it like you will be flying in it. remember, a moderate size RC plane can cause as much pain or death as a full size plane can to an individual.
   

< Message edited by gwweber -- 1/2/2013 1:05 AM >

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RE: 2.4 receivers - 12/31/2012 4:10 PM   
LSP972


 

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Status: offline 		It's the same mindset that brought us to our current state of affairs... i.e., most stuff these days is being manufactured to a price point, as opposed to a level oh quality. "We" demand cheaper prices. Guess what's going to suffer. You can bet its NOT the profit margin.

Joe Newbie is gonna go for the lowest price almost every time. You would expect that from him. What _I_ don't get is the experienced modelers (who should know better) who buy on price alone.

Actually, I _do_ get it; they're cheapskates.

.

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