I am writing for the first time on this forum. I am an rc newbie. I was lucky enough today to win an Esky Honey Bee helicopter. I have been looking everything over and charging the batteries and trying to figure out everything. I find that the cystal on the Helicopter is marked 72.130 and cyrstal on the transmitter is marked 72.870 . Shouldn't they be the same?
The box had been opened, but everything looked fine. Thanks for your input.
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No they are not the same freq. they are correct.</p></span>

Thank you for your input. My problem still exists. I still can get nothing to work on the copter. The transmitter does not seem to be sending a signal. The instructions say the copter has to calibrate itself when turned on. I believe it does this but will do nothing when asked to .
I'm sure I've done something wrong.
Help.
Thanks

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Your throttle and throttle trim MUST be all the way down (left stick) before you turn on your heli, also you must turn on the transmitter before the heli. Is there a light on your transmitter and is it on? Any light on your receiver?</p></span>

There is a light on the transmitter. The throttle scale on top is lit up. There is a light on the copter. It blinks red and green over and over. No solid color.

Supersdad,
You are correct. Your crystals need to be the same. Get a new set.

G.

Thank you: I will get a new set. Hope that works

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A transmitter, transmits on the frequency marked on the crystal, but in a receiver like yours the incoming frequency is mixed with the receivers local oscillators frequency and the result of both these frequency’s is what the receiver tunes into, that is why your receiver crystal is a different from your transmitter. The frequency you receive is acutely the result of the 72.130 receiver frequency combined with the local oscillator frequency to equal your transmitter frequency of 72.870.</p></span><u><font size="4" color="#0000ff"><font size="4" color="#0000ff"><span lang="EN">Gothic</span></font></font></u><font size="4"><span lang="EN"> does not know what he is talking about, another ignorant person giving wrong advice about something they know nothing about. please don’t waste your money on buying two transmitter or two receiver crystals. There is a reason one is called a transmitter crystal and the other is called a receiver crystal, because they are different. </span></font>

Thanks, I'm learning a lot today.

Don't pick on Gothic...he is correct the cryst. must be the same Freq.. period. One for trans and one for rec. Man some people have to jump on people and themselves ..????????? I wonder sometimes. He said a NEW SET,, set meaning....Trans and rec.

jim

wzak29

"Ignorant", very interesting word for you to use.
I wonder why the sell crystals in sets (same frequency). Maybe you should take a look at your crystals in your transmitter & receiver.

G.

Hi Jim,

Be careful wzak29 may call you ignorant also [sm=biggrin.gif]
Maybe he will learn something from this?

G[sm=thumbs_up.gif]

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<font size="2">Get your head out of your butt’s and gogle “super heterodyne receiver” maybe if you are lucky you might learn something, but I don‘t think you will.</font></p><u><font color="#0000ff"><font color="#0000ff">



<font size="2">Good luck with your heli.
</font></p></font></font></u></span><u><font color="#0000ff"><font color="#0000ff"><span lang="EN"><font size="2">supersdad</font></span></font></font></u><span lang="EN"><font size="2"> ask your question in a different forum before you waste your money on crystals, try this forum a lot of very experienced and intelligent people </font></span><u><font color="#0000ff"><font color="#0000ff"><span lang="EN"><font size="2">http://rc.runryder.com/helicopter/home/</font></span></font></font></u><font size="4"><span lang="EN"><font size="2"> Sorry but I can’t help you anymore as I will not be returning to this place, maybe I will se you at run ryder.</font></span></font>

Man, oh man. I can't believe the stuff that gets thrown around here.

The receiver crystal and the transmitter Crystal NEED to be MARKED the same frequency for them to work. If they are not, how am I going to know which set to buy? In 20+ years of experience in this hobby, I have never seen a chart relating transmitting frequency to receiver frequency. Why? because they are the same!


Rafael

WzAL29,, I am sorry my 16 years of flying helis and 44 plus years in the Rc Hobby has nothing to offer you. I am sorry that Rafael's 20yrs + or so has nothing to offer you, perhaps RC forums in general will have nothing to offer you. Sorry we are not intellegent enough to relate our experience. I will say that we are very blessed to have you here though.

Jim.....NEWBEE

OH by the way if you think we are tough.....go to the other sites

Jim

Wz is correct.
you guy's are confuseing channel no. with crystal no. The channel no. must be the SAME, ( 34/34,) 40/40) etc.
The no. on the tran's crystal will not be the same as the no. on the receiver crystal !!!
I have you both beat !52 year's playing with rc.
paul

[quote]ORIGINAL: ptb


Although I don't doubt either you or Wz, this is not the way to try to clarify a question that a newbie might have. The channel number corresponds to a frequency number. The TX crystal is marked as TX crystal, the RX Crystal is marked as RX crystal, and the channel number that corresponds to a frequency number are the same. it does not matter if the crystal is TX or RX. That is non-arguably the bottom line. The number of the TX Crystal and the number on the RX crystal have to match for the system to work. Since the channel assignments in the US are a set of discreet frequencies, I can't see where a manufacturer would put a channel number AND a frequency numer on the TX crystal and a channel number and a DIFFERENT frequency number on the RX crystal.

I agree with Wz on the type of receivers used. Just not the delivery method of the information.

So when I go to the store, to buy crystals that match my transmitter frequncy, I should look in the back of my transmitter and find out the channel or the frequency, then using this chart I can determine the other half of the information... Remember that it is against FCC regulations to change Transmitter crystals by yourself. Only a licensed technician can change TX crystals. Changing a trasmitter module is not the same as changing a TX crystal. Just don't change the crystal itself.

Chart taken from here: [link]http://www.modelaircraft.org/events/frequencies.aspx[/link]

I understand the concept of "super heterodyne receiver", the differing frequencies and I know for a fact that those are the types of receivers used in our applications. But to tell a newbie to look for frequency X on the TX crystal and frequency Y on the RX crystal is just the wrong thing to do. Crystals are going to be marked with the frequencies (or channels) on the chart above ONLY. and only matching crystals will work.

Wz and Ptb have much more intimate knowledge of how RC systems work. Although interesting, I have no intention on reaching that level of knowledge. I have enough stuff in my brain between my hobbies and my career. What I can pick up along the way I consider it a bonus.

Rafael

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Example, <span lang="EN">Crystal controlled AM radio</span>;</p>

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When your receiver tunes into your transmitters frequency, your receivers crystal oscillator generates a signal 455 kHz less than the frequency of the transmitter. For example, tuning in to a 800 kHz transmitter would generate a 345 kHz signal (800-455=345) that would be subtracted from the incoming signal (800-345=455). A bandpass filter then allows only the 455 kHz signal to go to the demodulator circuit to recover the signal.

<span lang="EN">I understand that this is more than you need to know for this hobby, I just did not like that Gothic
tolled someone to go and waste their money on crystals that are not needed, <span lang="EN">I have held a General class FCC<span lang="EN">license for over 40 years.</span></span></span></p>

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