What is required for simultaneous driving of 2 cars without interferance?  
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All Forums >> RC Cars, Buggies, Trucks, Tanks and more >> RC Car Radio Equipment >> What is required for simultaneous driving of 2 cars without interferance?
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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 4:30:00 AM   
Ge|atinousFury



Posts: 89
Joined: 7/9/2003
From: Auburn, AL, USA
Status: offline 		2 questions.....I really appreciate the info I get from people here on these forums Thanks in advance for the help!!

1. Myself and my friend have just pre-ordered a couple of Savage SS's from our LHS and the kit doesn't come with a radio. We are both planning on getting JR XR2i or XR3i radios (whichever model we choose we'll still get the same model). Now, considering I know next to nothing (well, make that nothing) about radios, what are we gonna have to do (if anything) to be able to drive the trucks together without us picking up each other's radio signal?

2. My LHS informed me that if I want to add the reverse module for the Savage, it would require a 3rd channel on my radio, which the JR XR2i radio doesn't have. The guy told me that there's a $20 part that can let me use the reverse module by adding a channel or something like that. Considering the XR3i is $70 more than the XR2i, should I just get the XR2i with the optional part he is talking about or should I just go for the XR3i?
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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 4:58:00 AM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		From experience, get the best you can afford. If you can get a Radio with the 3rd channel do it.

As far as being able to run together, just make sure you get radios on different channels.

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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 5:49:13 AM   
Ge|atinousFury



Posts: 89
Joined: 7/9/2003
From: Auburn, AL, USA
Status: offline 		Any particular reason that the XR3i would be any better than the XR2i with the added $20 adapter?

Also, do JR radios come with receivers?? If not, can anyone suggest one for me to buy.....because I doubt that the Savage SS kit comes with one.

< Message edited by Ge|atinousFury -- Jul 14 2003 1:26AM >

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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 10:51:26 AM   
HabeebThe711Guy



Posts: 75
Joined: 7/11/2003
From: Canoga Park, CA, USA
Status: offline 		i was kinda wondering the same thing as gelatinousfury: at the tracks theres so many people with controls rite how come none of them interfere with each other, the only channels i heard you can get different are 27 and 75 what about if you wanted to get a third or fourth party racing with you how do you do that?


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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 2:23:13 PM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		27 and 75 are the frequencies. In each frequency you have several channels (actually channels are just different frequency like 27.145[URL=http://members.citynet.net/kbrown/FmtFliers/FreqChart.html]Click here to see chart [/URL] of the channels.)



Ge|atinousFury,
I've not used either radio, so this is just my personal opinion. I would rather buy a radio with what I need then to rely on a add on componet. To me thats just something else to go wrong, and in the world of RC you don't anymore headaches.

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The knack of flying is learning how to throw yourself at the ground and miss.
--Hitchhikers Guide to the Galaxy--

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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 3:31:27 PM   
Ge|atinousFury



Posts: 89
Joined: 7/9/2003
From: Auburn, AL, USA
Status: offline 		[QUOTE]Originally posted by CHassan
27 and 75 are the frequencies. In each frequency you have several channels (actually channels are just different frequency like 27.145[URL=http://members.citynet.net/kbrown/FmtFliers/FreqChart.html]Click here to see chart [/URL] of the channels.)



[/QUOTE]

Got it, that makes a lot more sense now. So how do actually switch between channels? By installing different crystals?

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What is required for simultaneous driving of 2 cars wit... - 7/14/2003 11:49:51 PM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		yup, change the crystals. Or if you have the dough you can get radios and recievers that you "dial in" the frequency.

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What is required for simultaneous driving of 2 cars wit... - 7/15/2003 11:57:12 AM   
HabeebThe711Guy



Posts: 75
Joined: 7/11/2003
From: Canoga Park, CA, USA
Status: offline 		ahhhhhh its all falling together now how much are crystals can you keep changing them if you want to cange channels how often do they break or whatever


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What is required for simultaneous driving of 2 cars wit... - 7/15/2003 12:01:31 PM   
HabeebThe711Guy



Posts: 75
Joined: 7/11/2003
From: Canoga Park, CA, USA
Status: offline 		wait i went to the channel chart and so does 75 mhz have more channels than 27 or whatever mhz is it a beter to buy the 75 over the 27 mhz. are those all the channels you can choose from


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What is required for simultaneous driving of 2 cars wit... - 7/15/2003 2:27:03 PM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		For ground RC 27 and 75 are your limits (if you want to stay legal.) I wouldn't recomend going into the air frequency, just for safety issues.
If you do for changing crystals hee, you will find it is aparently illegal to change crystals by yourself. With that said, go to the track and I bet you find guys with half dozen or so crystall sets, so they can always get on a free channel.

Crystals can cost about 15 to 30 dollars. depending on where you get them and the radio you get them for. Make sure you get crystals that will work with your radio and reciever. For example, if you have a JR radio on the am band, don't buy Futaba fm crystals.

If you take decent care of them, and store them in something to keep them from bouncing around and such, they should last a good while.

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What is required for simultaneous driving of 2 cars wit... - 7/16/2003 12:29:26 AM   
RandoMere


 

Posts: 36
Joined: 6/26/2003
From: Tallinn, ESTONIA
Status: offline 		well, actually there arent only 2 frequencies, as you say/think. There are: 26,27,35,40,41,72,75 mhz... In us, I think 75, and 27 are legal for cars and 72 for planes (right?). 27 is free frequency all around the world, so that means your garage door, taxi drivers or whoever else can use this frequency, that's why I'd suggest you to get 75 in US. If a crystal falls down from 30 cm height you could might aswell throw it away, that's why you should buy/make yourself a cristal case.

CHassan: "If you do for changing crystals hee, you will find it is aparently illegal to change crystals by yourself." what do you mean by that? Sorry, but my english isnt that good . Did you mean that changing cristals illegal? If that's right than I dont see why

Basicly Futaba AM cristals should work on JR AM radios. Just make sure it's AM or FM.

Maby someone should make a article about radios, explaining how each modulation (AM-FM-PCM) works and what to choose.

Hope the text that I wrote made any sence.


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What is required for simultaneous driving of 2 cars wit... - 7/16/2003 3:17:14 AM   
HabeebThe711Guy



Posts: 75
Joined: 7/11/2003
From: Canoga Park, CA, USA
Status: offline 		so when i get my controller its best to get a 75 mhz because its for cars only and does the controller usually come with a crystal or do i have to buy one seperately, can you choose which channel you want for your crystal if you buy it, how big are they


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What is required for simultaneous driving of 2 cars wit... - 7/16/2003 3:37:40 AM   
RandoMere


 

Posts: 36
Joined: 6/26/2003
From: Tallinn, ESTONIA
Status: offline 		yes, they come with cristals, yes, get the 75 mhz, and yes, some companies (like towerhobbies) lets you choose frequency. they are quite small, i'd say 1x0.5x0.3 cm


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What is required for simultaneous driving of 2 cars wit... - 7/16/2003 5:28:13 AM   
CHassan



Posts: 1230
Joined: 8/26/2002
From: Beavercreek, OH, USA
Status: offline 		" Did you mean that changing cristals illegal?"

Aparently in the US it is illegal to change a crystal IN THE TRANSMITTER, unless you are certified. At least that is what I have derived from some posts on here.
Here is what Futaba's site says about it.
Changing the crystal on your transmitter is illegal unless you have the proper license. The FCC has established guidelines for the modeler's safety and for the safety of spectators. For safety and FCC reasons we must request that both TX and RX be sent to the service center to ensure proper crystal change and retuning to the new frequency. Crystal based radios cannot be converted to another band without parts replacement, and may not be able to be converted at all. Certain radios can be converted, for example, from 72 to 75MHz. Please contact the service center for any other conversions.

The applicable Federal Regulation is as follows:

TITLE 47--TELECOMMUNICATION COMMISSION (CONTINUED)
PART 95--PERSONAL RADIO SERVICES

Subpart E--Technical Regulations
Sec. 95.645 Control accessibility.
(a) No control, switch or other type of adjustment which, when
manipulated, can result in a violation of the rules shall be accessible
from the transmitter operating panel or from exterior of the transmitter
enclosure.
(b) An R/C transmitter which incorporates plug-in frequency
determining modules which are changed by the user must be certificated
with the modules. Each module must contain all of the frequency
determining circuitry including the oscillator. Plug-in crystals are not
considered modules and must not be accessible to the user.



With that being the rules, I wonder why the crystals are accessible to the user??????


In the US the AMA has approved frequencies for the use with models (see [URL=http://www.modelaircraft.org/Comp/frequency.htm]ACADEMY OF MODEL AERONAUTICS APPROVED FREQUENCY USE PLAN[/URL] )
The most common being 72 and 75.

< Message edited by CHassan -- Jul 16 2003 12:39AM >

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The knack of flying is learning how to throw yourself at the ground and miss.
--Hitchhikers Guide to the Galaxy--

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