I bought a couple of Rx's really cheap off eBay. They just say TurBorix FM/PPM and are 6 channel. There is a website labeled on them. It is

[link]http://rvminc.net[/link]

However, the Rx's are not listed there.
They look like they are micro. I need to get some crystals and I'm not sure if they take dual or single conversion. I want to use a 30 channel crystal in one, and a 46 in the other. I know they take the standard size futaba crystals and not the micro. Also, will a micro Rx's work OK in a trainer plane with an OS LA 40 engine? The whole Rx just measures 1 3/8 X 1 inch. So it is very small. They were not sold as micros, but what else could they be?

Sorry wrong post... deleted

If they are cheap micros then they will probably not have the required range for a 40 size RC airplane. They are probaly for park flyers that you will fly in close to you. In the RC world sometimes an apparent bargain price won't get you what you need. []

Are you talking the size of a Hitec Feather or the 555 ?

I contacted the seller. This is what he had to say:

"Hi there,

The receiver itself is single conversion. : )

The range of the receiver you have received is 500m which is same as the one in the pictures. : )"

Is 500M enough range? Can I use dual conversion crystals in a single conversion Rx? Also, what about high band and low band? I want to use a 30 and 46 crystal.

The receiver comes from Hong Kong and has the name "TurBORIX" on it

You need to get the correct crystals for ANY receiver. These RX's are for park flyer use and may or may not work with your transmitter. Maybe these units will work for you. Get the crystals from the seller, if possible. Without more info we, on the forum, can't really help.

Safe Flying!

GarbMan,
As said above, this receiver is obviously designed for park flyers. Do the math on distance. 500 meter = 1640 feet = .31 miles. That's a third of a mile, or about 3 city blocks. That's not really that far at all. A regular radio control system will have an effective range of about a mile to a mile and a half. So this receiver is not going to be able to be used for much.

As for using crystals to change the channel. No matter what brand of receiver you need to use the crystals made by that manufacturer for that receiver in order to make your change. Not using the parts made by manufacturer is just asking for trouble down the road.

Ken

Have you established what frequency these receivers are designed for? I'm used to 72MHz, but there are others. I ask, because I wonder if your 72MHz #30 and #46 transmitters will work with these receivers.
If you don't know that, either, you could buy a single conversion HiTec crystal and try it, and if it works, do a range check.
And, if it doesn't work, you're out the price of a crystal and a couple cheap receivers.
Good luck,
Dave Olson

Here is the info and also a link to what I bought. I bought the 72Mhz.

New Futaba Type 6 Channel FM Receiver
Model Number : rcps81402

35/40/72Mhz Avaliable

You are looking at a brand new E-Sky 6Ch FM receiver. You can choose 35/40/72Mhz. This receiver is suitable for most of the Tx in the market such as Futaba/Hitec/GWS and etc..


Features: Brand New
35/40/72 avaliable
Light Weight
Compact Size

[link]http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=6056281011&rd=1&sspage name=STRK%3AMEWN%3AIT&rd=1[/link]

I see a lot of dancing around the issue and things inaccurate.

You can use crystals from different manufacturers as long as they are made for that type.
You cannot use dual conversion crystals with single conversion radios and vise-versa.
If you got a dual conversion radio, ONLY get and use dual conversion stuff.
Let's assume that you somehow managed to get a single conversion crystal working with a dual conversion receiver. Do you really want to chance a mishap in the air?

ger87410,

Did you notice Post #5? The receivers are single conversion.

The radio makes no difference, regarding whether the receiver is single or dual conversion. There is no such thing as a dual conversion transmitter.

Best wishes,
Dave Olson

So what ever I use these receivers for, I must use single conversion crystals. Is this right?

I wonder if they are low or high band. I was hoping to us channel 30 and 46. I think both of these channels are high band. I have been doing some research on the single and dual conversion and I understand it more now. I need to know about this high band/low band thing now. Maybe some one can help me determine if the receivers are high or low band. Thanks for all the help!

Futaba is the only one I've noticed that sells Rx's as low or high band. The 30 would be low and 46 high using their standards. Please use those Rx's for park flyers or maybe a 1/2A plane that you wound keep within a 300M range. I wouldn't try to stretch out to the 500M advertised. Yes, you should use the single conversion crystal.
Not all good buys on ebay are just that. Don't try to save a few dollars on a Rx that could destroy a plane and engine worth so much more or even cause injury.