Help identifying wireless board

Wireless & IoT
1

Hey guys/gals,

Like most people (I assume) I refuse to throw away old circuit boards until I have salvaged them :slight_smile: Today I found a transmitter on an old cheap model heli that I can not identify the IC on. I have the receiver side of that, so I will try to find info on that in case it helps, but I thought maybe one of you may be able to identify the part.

The board in the image was actually soldered onto the mainboard in the TX, so would make a great little RF link for a future project, but kinda useless unless I can find a datasheet. I checked my go-to place of alldatasheet dot com, but to no avail.

Hope someone knows what this is, or at least the manufacturer.

Much appreciated.

Paul

Link to image

https://plus.google.com/101365799430432 … 0432399689

2

OK, I found some info here: http://www.compoexpress.com/a7105-wirel … -4ghz.html but no datasheet

3

Funny, as soon as you ask for help you find what you were lookinmg for all along…sigh*

4

I hate it when that happens. But, just think, if you didn’t ask here, then you would never found it…

The chip should have a datasheet. You might want to search just for the chip’s model number.

EDIT: Think this is the datasheet for the IC. http://www.avantcom.com.tw/AVANTCOM/TC/ … E/18_3.pdf

5

It may be a board like HopeRF’s RFM69 or one in that family. Or like Dorji (aslo in China) with the Si4432 or similar.

The data sheet you referenced looks close to one from either of the vendors above, both in China.

Both of these vendors make boards that use radio chips made in the US by either Semtech (Camarillo, CA) or SiLabs in Austin, TX.

These are really great boards - selling for $5 or so from Anarduino.com and perhaps SparkFun sells a subset.

The board level data sheets from these vendors “hide” who makes the chips.

This protocol stack is used on these kinds of boards and others.

http://www.airspayce.com/mikem/arduino/RadioHead/

I don’t own any of those companies. I just do firmware development consulting work using mix of these.

6

Yeah I agree, great little boards for small RF projects…and lots of fun.

Thanks for your input guys