CC11xL/CC1101 as receiver for KEELOQ signals

This has worked well for several customers to receive Keeloq, do you have something similar for transmitting Keeloq?

Thanks for your post!

I working on similar task: trying to receive OOK PWM signal, manchester encoding from several types of existing equpment in async mode.
But did not have success yet.

Your post help me tune cc1101 and i see my signal now, but range is pretty bad, less than 10 meters.

I would like to know - is there some application notes about tuning ASK/OOK PWM in async mode? DN022 i've already read.

I try to findout info about keeloq and check you settings (to make same changes for my signal) and miss: keeloq typical BW is about 280 kHz, but you set 135. Datarate is about 1ksps, but you set 3.8.

I can understand datarate increase (your already wrote about it - to decrease jitter). Also i understand AGCCTRLx settings.

But totally miss why such BW is used and why your change FSCTRL1 settings (set different IF frequency).

Thanks in advance.

The optimal IF freq depend on the RX filter bandwidth. Its been some time since I worked on this, but my understanding was that the freq offset the receiver must tolerate was +/-100kHz. The 135kHz RX bandwidth was set to handle this offset and tested to be sufficient.

Thanks for you reply, but i still miss why i have such small receive distance (less than 10 meters).

I even find keeloq device and check and got same results - less that 10 meters of receive distance.

How to improve that? I try to set wide bandwidth (200-300 kHz) and try to change AGCTRL2 (MAGN_TARGET value) and have no success.

Do you have any idea how to improve sensivity and increase receive distance? I need at least 50 meters at open space...

If you only get 10 m its sounds like something is wrong. What HW do you use? What SW? What kind of antenna? What are your power table setting? What RSSI do you read?

Yes, it's seems to me, that i do something wrong, but i can done noob mistakes (because i just take this task and have small experience).

We have existing hardware in our own automation systems. In most cases used uaa3220ts transiever. Radio is OOK (ASK) PWM signal in 433.92 with manchester encoding with about 1.5ksps data rate.

I testing new hardware prototype, msp430 + cc1101 with helical antenna, which will be used in new remote.

I've used you config (published in 1 post) and able to get signal in async mode from 5-7 (stable) meters. But i lost signal in 10+ meters. Trying to play (according to DN022) with AGCTRL0/2 and have no success in increasing range.

May be you can suggest better config or what to change in your existing config to increase range (sensivity)?

Have you tried testing with our CC1101 EMs and SmartRF studio? Have you done any conducted measurements?

Nope, i did not have cc1101dk or EMs, only our proto hardware.

Btw, what actual range with real keyfobs you get?

I find real keeloq keyfob and check your config and got same results - less than 10 meters.

Problem in HW?

sounds like a HW problem yes. You might test some other smartrf studio settings to verify this, but I recommend that you try testing it with our HW first and that you also do some conducted measurements (If you do not have a SMA connector, disconnect the antenna and mount a semirigid cable). Further, have you tuned the antenna on your board?

Well, i try to get cc1101dk, but need reason for tops that this have sense and worth.

Not really sure about HW, i've testing ready rf modules from trusted manufacturer, something like that: http://www.alibaba.com/product-gs/280374578/CC1101_433MHz_rf_module.html (not same but very similar).

For sure, need to check with SMA and with semirigid cable too. Right now usual spiral antenna is used, which is used typically in our remotes.

I miss - do you remember what range do you get with real keyfobs from 1 post?
What's else i can try to play except bandwidth/datarate?