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« on: January 29, 2010, 07:39:18 PM »
sriharishine
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Hi to All,

As a Beginner, I am really confused about the radio system.

What is channels (like 4Ch, 6Ch, etc...)? SO if I have 2CH radio system then I can control 2 motors or servos RIGHT? the number of channel is the different devices that can be control by that radio right?

Is the GHZ rule the distance the radio can control? If yes, How the Distance of the radio system control can be calculated and based on what it is calculated?

The radio system means both the transmitter and receiver,
For Eg:
I am using a 4 CH Radio system, I have to install the receiver in the Plane right?, then there will be four outputs right which is to be used to control either servo or a motor right???

Please teach me above things
« Last Edit: January 29, 2010, 07:41:47 PM by sriharishine » Logged
 

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« Reply #1 on: January 29, 2010, 09:36:23 PM »
Anjan
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Hi
srihari
im also a beginner.
Plz go through all threads
in the forum.u may get the answer.
Also tons of info in the web.
Regards.
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« Reply #2 on: January 29, 2010, 10:13:41 PM »
anwar
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Channels : The umber of distinct/individual controls you can remotely operate. They can be motor / servo / lights etc.

Frequency : Band used for radio communication.  The distance is not directly related to this. It is controlled by the "power" (specified in watts) of the transmission system.  Note that on a radio with an extendable antenna, keeping the antenna collapsed severely reduces its range.  The main frequencies used are 2.4Ghz, 72Mhz, 40Mhz, 35Mhz and 27Mhz.  The first two are most common in India.

Yes, the receiver goes in the plane, and the transmitter is in your hands. You can control 4 distinct items with a four channel radio system; typically one motor and 3 servos.

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« Reply #3 on: January 29, 2010, 10:16:00 PM »
anwar
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Oh, and I forgot mention.

Try to do a bit of searching on this forum or on Google before posting questions.  I do not mean to discourage you from asking questions, we are all happy to answer them.  But it is a good skill to acquire as you get deeper into this hobby (or for anything else).  If you are still confused after reading up on the subject, feel absolutely free to ask here.
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« Reply #4 on: January 31, 2010, 10:40:36 AM »
sriharishine
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No I am clear so far,

But can anyone say the difference between 72 MHz and 2.4 GHZ - Does this rule the distance?

If no then how the distance of the RADIO range is calculates?

And What will happen if the plane or Heli move out of the Radio Range? I mean If I mistakenly fly for more distance?

Thanks in Advance...

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« Reply #5 on: January 31, 2010, 10:59:02 AM »
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I answered the first two earlier.  The difference in those two is that they are different "bands" of communication and there are other details like "encoding" differences.  To oversimplify it, think of them as AM radio and FM radio. And range is controlled by the "power" of the transmission system, not by what "type" (72 or 2.4) of system it is. Most radios are 100milliwatt systems (there are some 10mW systems as restricted by various goverments in other countries, especially Europe).

Typically the manufacturer will tell you what the range is (when setup properly).  When a plane goes beyond the range, you lose control (resulting in a crash typically).  But usually the range is good enough that you first lose proper visual/sight of the plane as it moves too far away from you. You still have control of the plane, but you cannot see properly whether it is coming towards you or flying away from you etc to control it properly.  Finally you will lose the radio range also, when it moves too far away.
« Last Edit: January 31, 2010, 11:02:27 AM by anwar » Logged

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« Reply #6 on: January 31, 2010, 11:04:34 AM »
sriharishine
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OK Thanks for that....

I have heard in some threads of this site about the conflicting in the radio. I mean If two plane with same radio system is flying in a same place.

So what will be the problem exactly?

Whether the Motors and servo of the one plane may be controlled by other's radio?

OR Whether there is some technique to overcome this ? and make it never happen...

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« Reply #7 on: January 31, 2010, 11:21:25 AM »
anwar
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In 72Mhz, there are various "channels" (controlled by the frequency of the "crystal" you inside the transmitter and receiver, and you have to ensure they are matched pairs). As long as two people flying in one place are using different channels within 72Mhz, they are fine, there should be no conflicts (like one person will be on 72.010Mhz and another person will be on 72.030Mhz).  If two people try to fly on the same exact band+channel, you will get conflicts.

In 2.4Ghz, there is no concept of channels (internally there are, but the flyer does not worry about it, the radio takes care of picking free ones), so such conflicts are prevented.  This is why 2.4Ghz is becoming the standard. Think of it as two WiFi wireless networks from adjacent offices working without issues.
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« Reply #8 on: February 05, 2010, 09:42:10 PM »
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which is the best model for beginners to start with.
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« Reply #9 on: February 05, 2010, 11:13:52 PM »
anwar
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It depends on your budget.  If you can afford it, buy a good "programmable" radio with multiple model support and at least 6 channels.  They are a one time investment, and worth every bit (instead of buying a simple one and spending more for an upgrade in the not too distant future). 

On the lower end, there are many choices, please search this forum. There are some offered by rcforall.in and other vendors here.
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« Reply #10 on: February 06, 2010, 07:53:33 AM »
vinay
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Sri Hari, I think its better to do a bit of research by yourself. Believe me, you will get a lot more detailed answers than what the people can type over here. In fact some articles are so detailed, you won't bother to ask questions in forum at all, In fact, You will start answering others questions. Wink. GOOGLE is really a GODs gift to mankind knowledge. Start using it. Thumbs Up

A simple example:

http://www.google.co.in/search?hl=en&rlz=1C1GGLS_enIN291IN305&q=difference+between+FM+and+2.4Ghz&btnG=Search&meta=&aq=f&oq=

Hope this helps. Smiley
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« Reply #11 on: February 06, 2010, 08:09:40 PM »
sriharishine
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Anwar, Close this thread.... I dont want it anymore...
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« Reply #12 on: February 06, 2010, 08:18:59 PM »
ankur
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u can lock this topic on your own
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« Reply #13 on: February 06, 2010, 09:26:34 PM »
anwar
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No need to lock Smiley   

This is not a "Wanted" thread.  It is more about radios in general, so it is just like any other thread.
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« Reply #14 on: February 06, 2010, 09:34:07 PM »
ankur
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hmm..thats true
will help others to elaborate
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« Reply #15 on: February 07, 2010, 07:44:54 AM »
vinay
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Nothing to get angry abt it sir! All I was trying to say was that sometimes google gives BETTER results than getting all the answers from here. I was not trying to mock at all in anyways Smiley
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« Reply #16 on: February 07, 2010, 10:14:54 AM »
sriharishine
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Ok I am not angry, It may be my fault as I started this topic without searching with google and so....

Let it be.... I will try to lock this thread if possible.

Thanks for everyone...
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« Reply #17 on: February 07, 2010, 01:15:26 PM »
ankur
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sir,don't get too angry and lock the thread
let it be open and discussions on same or nearly the same topics go on.
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