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RC Radios, Transmitters, Receivers, Servos, gyros Discussion all about rc radios, transmitters, receivers, servos, etc.

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Old 05-25-2014, 05:07 PM   #1
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Default Dynam 72Mhz radio reciever needs crystal

I have a radio and receiver from a hawk-sky kit and the receiver is missing the crystal (I have no idea why). The radio is a Dynam model NE-KO 4 channel. The crystal is for channel 50. The Tx has 72.790 labeled on the back. I can't find a Dynam crystal (other than 2.4Ghz) and was curious if any brand 72Mhz crystal (channel 50) would work for this receiver. I would like to fire the hawksky up and see if she still fly's.

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Old 05-25-2014, 05:27 PM   #2
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I dont think you found any 2.4Ghz crystals anywhere, because 2.4GHz doesnt use crystals. Generally 72Mhz crystals are interchangeable between brands but I cant say for sure with Dynam.

Assuming you have a 2.4GHz transmitter it would probably work out cheaper and easier just to pick up a cheap 2.4Ghz receiver and swap the 72MHz receiver out. For instance you can pick up a Spektrum compatible DSM2 'Lemon brand' receiver for less the $6. I don't think you will find a set of crystals for that price.
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Old 05-25-2014, 05:43 PM   #3
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Originally Posted by JetPlaneFlyer View Post
I dont think you found any 2.4Ghz crystals anywhere, because 2.4GHz doesnt use crystals. Generally 72Mhz crystals are interchangeable between brands but I cant say for sure with Dynam.

Assuming you have a 2.4GHz transmitter it would probably work out cheaper and easier just to pick up a cheap 2.4Ghz receiver and swap the 72MHz receiver out. For instance you can pick up a Spektrum compatible DSM2 'Lemon brand' receiver for less the $6. I don't think you will find a set of crystals for that price.
You are correct, there are no crystals for 2.4Ghz. I don't know where I got that at!! I thought I saw some on the Nitroplanes site. I may as well just buy a cheapo 2.4Ghz for it like you're saying. I have a friend who wants to learn how to fly and I the hawksky would be a great way to go.

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Old 05-25-2014, 07:08 PM   #4
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Not sure if Dynam used + or - shift but other than that issue you should be able to pick up used 72 nhz RXs cheap. Possibly as cheap to get a complete RX with the right crystal as to find the right crystal by itself.

There will be a different brand crystal that will work. The question is what frequency multiplier they used in the RX. There were only a couple of different multipliers.

The crystals had a habit of falling out and i got in the habit of wrapping the RX in electrical tape to keep the crystal in.
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Old 05-25-2014, 08:34 PM   #5
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Originally Posted by fhhuber View Post
Not sure if Dynam used + or - shift but other than that issue you should be able to pick up used 72 nhz RXs cheap. Possibly as cheap to get a complete RX with the right crystal as to find the right crystal by itself.

There will be a different brand crystal that will work. The question is what frequency multiplier they used in the RX. There were only a couple of different multipliers.

The crystals had a habit of falling out and i got in the habit of wrapping the RX in electrical tape to keep the crystal in.
Thanks for the info. I never thought about the crystal falling out.

What was I thinking?
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