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HomeAircraftHelicopterRadio - Hitec Aurora › Using hitec spectra mod in 9CAP
05-08-2005 05:31 AM  13 years agoPost 1
joserpaq

rrNovice

Miami

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I just got a 9CAP and was told by my local hobby shop that the Hitec spectra module will work perfectly in the 9CAP which would be a good thing since I already have a spectra module. I tried it and it seems to work fine but I'd like to know if anyone has any experience with this combination.

Thanks

Jose

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05-08-2005 05:46 AM  13 years agoPost 2
Dr.Ben

rrMaster

Richmond, VA, USA

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I know you just asked a nuts and bolts question, but consider the following.......

I'm almost completely certain that it is illegal in the US to mix the Hi Tec module with the Futaba transmitter since it nullifies the FCC type acceptance for the transmitter.

No, I'm not playing tattle tail here. But you need to understand that if you have an accident that hurt someone, don't expect your AMA insurance,if you have it, to necessarily apply.

Ben Minor

Get one of the new Futaba synthesized modules for your transmitter.

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05-08-2005 05:48 AM  13 years agoPost 3
Z-Heli

rrApprentice

Vienna, Northern Virgina

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Futaba synthesized modules for 9C are only $89 from tower,
although not in stock right now.

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05-08-2005 06:10 AM  13 years agoPost 4
Dr.Ben

rrMaster

Richmond, VA, USA

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Should be in stock w/in a week or so. At only 15 bucks more than the HiTec, it's the one to get.

Ben Minor

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05-09-2005 03:02 AM  13 years agoPost 5
joserpaq

rrNovice

Miami

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If I had to buy a module I would definately buy the futaba but I already have a spectra that's why I'm asking. I fly in an empty field in the middle of nowhere so there is really nothing to run into.

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05-09-2005 03:57 AM  13 years agoPost 6
rjmdubois

rrApprentice

São Paulo - Brazil

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I've been using the Spectra Module with a 9C for years. It also worked on my previous 8U. Never had a problem. Several friends here are using the same.

I'm glad the Brazilian equivalents of FCC and AMA are not concerned about protecting some companies market-share.

Richard

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05-09-2005 04:10 AM  13 years agoPost 7
joserpaq

rrNovice

Miami

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thanks for the reply

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05-09-2005 04:32 AM  13 years agoPost 8
gjestico

rrApprentice

Vancouver, B.C.

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I dunno about the availability on that module. I have seen the stock status on Towers site go from early Feb, to late Feb, to early March, to late March, to early April, to Late April, and now to early May.
I am not kidding. I have had one on backorder for 4 months now. Hope it materialises sometime soon..........Should be the key though.
Greg

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05-09-2005 06:17 AM  13 years agoPost 9
dkshema

rrMaster

Cedar Rapids, IA

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I'm glad the Brazilian equivalents of FCC and AMA are not concerned about protecting some companies market-share.
I don't believe the FCC regulations that you refer to were designed to
"protect some companies market-share"
. The AMA's contribution here is that they don't support the use of an "illegal radio". It's not in their best interest.

As a matter of fact, HiTec/RCD was not around when this particular regulation went into effect. So there was no way a non-existent market-share could have been protected.....

The FCC here in the US approves these particular radios by something called "type-acceptance". This allows the manufacturer to submit engineering and engineering test data for a radio system. The manufacturer produces a specific transmitter configuration, and the engineering and test data supplied for type-acceptance reflects the performance of THAT CONFIGURATION. When approved, the type acceptance allows the manufacturer to build radios of that configuration, without EACH system having to be approved individually.

In the case of the Futaba (and all other type accepted systems that are approved), replacing the Futaba RF module with one from a different manufacturer suddenly changes the configuration of that particular radio. It is now being operated with a configuration that has neither been tested or submitted for approval by the FCC. It is no longer "type accepted", and therefore, is not legal under the current US regulations.

It is possible that although the Spectra module "works" in the Futaba transmitter, differences in the way that Hitec drives the modulation for the RF module and the way in which Futaba drives the modulation of the RF module may cause differences in the way that the RF module performs. That, coupled with possible differences in the antenna coupling of the Futaba and HiTec system may cause your transmitter to output spurious signals, or sidebands that are not properly attenuated. The result is a dirty transmitted signal that may work with your RX, may be transmitting other signals that can affect others on different, or adjacent channels.

Dave

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05-09-2005 02:48 PM  13 years agoPost 10
BarracudaHockey

rrMaster

Jacksonville FL

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Is the cost difference of the modules more or less than the cost of replacing a helicopter because while it worked at 10 feet it didn't work at 300?

Andy
AMA 77227
http://www.jaxrc.com

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05-09-2005 05:59 PM  13 years agoPost 11
vetrider

rrElite Veteran

Daleville, AL (Ft.Rucker)

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I'm glad the Brazilian equivalents of FCC and AMA are not concerned about protecting some companies market-share.
Best statement I've seen on RR in YEARS!

If you’re not flying any ORGINIZED events get the one you can as it will work fine.

I've used the Hitec module for years on my 9C also but I throw in the stock module for FF's. I only us the 9C as a backup radio for FF but I fly planks with it locally hence the different freqs needed.

BTW .. I am FCC Licensed and get paid for it.

Dave, I understand your comments and agree with 99% of it but big business has used the powers of lobbying to get their way.
Bare in mind that the way most of the HOBBY companies that make our radios uses antiquated technology on the TX/RX process.

Nolan

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05-09-2005 11:39 PM  13 years agoPost 12
dkshema

rrMaster

Cedar Rapids, IA

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OK -- the big radio manufacturers conspired to write the FCC regulations to their benefit.

And we have nothing but old, decrepit, yesteryear technology to fly with as a result.

Anyone remember how to reverse servos on a radio you owned back in 1975? Or how you dialed in Expo. Or ATV, or adjustable endpoints. Or dual rates. Or having to tweak your receiver front-end at the beginning of each day's flying for best results. The cost of a full up, four-channel Bonner Digimite that was the equivalent of the JR Quattro (although the Quattro has more features). How did you get multipoint pitch, throttle curves. Or more basic question -- how ANY channel mixing occurred? And of course the channel spacing back then was the same. And then, that FM system and its availability, or the PCM system back then. Don't forget the size of your receiver, the size of your servos (and the selection of servos back then). Anyone remember FOUR-wire servos and THREE wire battery packs?

I suppose we'd be flying new spread-spectrum CSMA/CDMA radios by now on 2.4 GHz if it weren't for that nasty "BIG RC" cabal.

Yes, that conspiracy has certainly saddled us with old crap radio technology.

Pullllleeeeeeeeze. No more conspiracy theories.

Dave

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05-10-2005 02:31 AM  13 years agoPost 13
rjmdubois

rrApprentice

São Paulo - Brazil

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It is possible that although the Spectra module "works" in the Futaba transmitter, differences in the way that Hitec drives the modulation for the RF module and the way in which Futaba drives the modulation of the RF module may cause differences in the way that the RF module performs. That, coupled with possible differences in the antenna coupling of the Futaba and HiTec system may cause your transmitter to output spurious signals, or sidebands that are not properly attenuated. The result is a dirty transmitted signal that may work with your RX, may be transmitting other signals that can affect others on different, or adjacent channels
One of our club member works for a cell operator and brought a multi-thousend dollars frequency scanner to check any residual signal in adjacent channels. We have tested over 50 TX, (5 with Spectra). None of the Spectras show a problem. Actually, the worst case was a 4VF, probably due to either oxidation or a micro-crack in the cristal.

I don't want to point a finger on US regulatory, I think in general, they are very good. They just happen to create a lot of burocracy, and the bigger the company, the better the lawers they can hire to deal with that burocracy.

Someone may think: this burocracy also brings safety.
Wright?
Wrong.

I've seen ten times more crashes due to batteries failures than Radio failures, and I don't know any specific standard for batteries usage in R/C (neither in US nor in Brazil).

If safety is first, the regulator body should go after batteries and not TX - but there's no big battery manufacturer that cares to prepare a presentation to the regulator about the danger of umbranded batteries for R/C.

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