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Model Forum / Radio Controlled / Helicopters / November 2006Futaba 7CH with Blade CX
Can it be done? I tried putting my crystal in the 4CH receiver of the Blade CX and nothing... >Can it be done? I tried putting my crystal in the 4CH receiver of the >Blade CX and nothing... If it's anything like the Rx on the CP, you'll need to use a single conversion crystal and put the radio in PPM mode for it to work. What is a single conversion crystal? The OTHER Kevin in San Diego a écrit : > >Can it be done? I tried putting my crystal in the 4CH receiver of the > >Blade CX and nothing... > > If it's anything like the Rx on the CP, you'll need to use a single > conversion crystal and put the radio in PPM mode for it to work. >What is a single conversion crystal? All you need to do is call or visit your local shop and say "I need a single conversion Futaba crystal on channel xx" where xx is the channel your transmitter is on. They'll know what you need and hook you up. An even better idea would be to take the CX and the radio to the shop and see if it'll work before plunking down your $$ on the crystal. | >Can it be done? I tried putting my crystal in the 4CH receiver of the | >Blade CX and nothing... | | If it's anything like the Rx on the CP, you'll need to use a single | conversion crystal and put the radio in PPM mode for it to work. Wouldn't it make more sense to order a crystal from E-Flite to put your CX onto the appropriate channel rather than trying to stick a Futaba crystal into it? Or get a TX crystal from Futaba to put the TX on the right channel for the RX? Crytals are often specific to certain vendors, even beyond the single conversion/dual conversion diffences. (And I've no idea if the Blade CX/CP RXs even are single or dual conversion ...) Why even bother though? The CX isn't going to benefit from any better mixers in the 7CH. A Blade CP could -- but not the CX. I think the controller is just a basic 4 channel TX, so it should work, but I don't see any benefits.  SignatureDoug McLaren, dougmc@frenzied.us A Buddhist walks up to a hot dog stand and says ``Make me one with everything.'' >Wouldn't it make more sense to order a crystal from E-Flite to put >your CX onto the appropriate channel rather than trying to stick a >Futaba crystal into it? Or get a TX crystal from Futaba to put the TX >on the right channel for the RX? Dunno. I do know that a Futaba "shorty" single conversion crystal worked in my CP.. >Crytals are often specific to certain vendors, even beyond the single >conversion/dual conversion diffences. (And I've no idea if the Blade >CX/CP RXs even are single or dual conversion ...) Yeah, why the hell is that? More money making opportunities for the manufacturer?? >Why even bother though? The CX isn't going to benefit from any better >mixers in the 7CH. A Blade CP could -- but not the CX. I think the >controller is just a basic 4 channel TX, so it should work, but I >don't see any benefits. Me either, but that wasn't the question. :) | Dunno. I do know that a Futaba "shorty" single conversion crystal | worked in my CP.. Then it sounds like it's single conversion then. | >Crytals are often specific to certain vendors, even beyond the single | >conversion/dual conversion diffences. (And I've no idea if the Blade | >CX/CP RXs even are single or dual conversion ...) | | Yeah, why the hell is that? More money making opportunities for the | manufacturer?? Not sure -- I never really delved into it. It could be mostly FUD, but there does appear to be some truth to it, at least in some cases. Looks like the Blade CX 2 will be spread spectrum -- with a dumbed-down DX6 radio. Same price, too. http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLH1250 | >Why even bother though? The CX isn't going to benefit from any better | >mixers in the 7CH. A Blade CP could -- but not the CX. I think the | >controller is just a basic 4 channel TX, so it should work, but I | >don't see any benefits. | | Me either, but that wasn't the question. :) And since when do we restrict ourselves to answering only the question asked? :) I agree with you "why bother" but being such a newbie at this i thought that crystals were universal. A crystal is a crystal, it responds to a freq and that is it no? In my world they do. So i figured hey, why not try it? I guess not! Does this mean that I have to be carefull when I purchase my next receiver? I need to look at a "compatibility chart" ? Thank you guys I guess this end that thread. Marc Doug McLaren a écrit : > | >Can it be done? I tried putting my crystal in the 4CH receiver of the > | >Blade CX and nothing... [quoted text clipped - 20 lines] > A Buddhist walks up to a hot dog stand and says ``Make me one with > everything.'' | I agree with you "why bother" but being such a newbie at this i thought | that crystals were universal. A crystal is a crystal, it responds to a | freq and that is it no? Absolutely not! First of all, even the frequency your RX (receiver) crystal says it is is not what it the crystal is actually rated at -- it's actually offset from the frequency it's supposed to receive, usually by 455 KHz (for single conversion RXs) or 10.7 MHz (for dual conversion RXs.) I don't remember if it's higher or lower -- it may be that some models are higher, and some are lower. That's the biggest difference between the various RX crystals. TX (transmitter) crystals are typically on the frequency you think they are (so they won't work in a RX!), but the frequency of the crystal is `shifted' as part of the modulation by a capacitator, and the exact value of capacitator needed depends on the crystal -- the frequency is not the only variable. If the crystal is not what's expected by the design, then your TX may transmit somewhere where it shouldn't. | Does this mean that I have to be carefull when I purchase my next | receiver? I need to look at a "compatibility chart" ? Well, this gets into a different subject -- which RXs are compatible with which TXs? As a general rule of thumb, Futaba, Hitec and Eflite gear all has `negative' shifts, and so they can work together. Airtronics and JR have `positive' shifts, so they can work together -- but not with Futaba/Hitec/Eflite gear. And this is only in the US -- they all work together outside of the US. SignatureDoug McLaren, dougmc@frenzied.us That woman speaks eight languages and can't say "no" in any of them. --Dorothy Parker |
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