Looking for "transparent" RF transceiver


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  1. #1
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    Default Looking for "transparent" RF transceiver

    Hello,

    Like other projects on this forum, I'm looking for RF transceiver modules that are "transparent".

    In my project, I will send very small data packets (20-30 bytes) once a day (data logger polling).

    As I'm not an RF module engineer, by "transparent" I mean a RF module to which I can connect a µC sending serial data and vice-versa on the receiver's side.

    I have found lots of different modules on the net but I'm not so sure which one I should go for and some of the ones I could have chosen are not "allowed" where I live in Switzerland, Europe.

    As an example, here is a transceiver from AUREL that could fit (well I suppose it should) my needs: AUREL RTX 868 FSK (650201343G). Unfortunately, it is not available for hobbyists :-(

    What looks great with this module is:
    - it has a PCB antenna ("on board");
    - data is transmitted in a "transparent" way;
    - it's interface is serial (most simple to me).

    Now I have found this module from LINX TECHNOLOGIES HUM-868-DT, the 868MHz HumDT™ Series Transceiver. But I'm not sure if it does the same as the AUREL one and I also need to add an antenna (not that tragic).

    Can anyone tell me if I'm going the right way or what I should pay attention at?
    Roger

  2. #2


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    Default Re: Looking for "transparent" RF transceiver

    Probably cost factor (got a budget?) and transmission distance would play a role in providing suggestions?

  3. #3
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    Default Re: Looking for "transparent" RF transceiver

    I'll been using (hobby) the HC-12 modules available everywhere. They are cheap and work well.

    For professional projects, i only use LORA devices
    Thanks and Regards;
    Gadelhas

  4. #4


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    Default Re: Looking for "transparent" RF transceiver

    I also use LORA modules for most projects. They utilize a SPI interface to the microprocessor. Not sure this meets your definition of transparent but they work fine.

    I have also used wireless modules from this source: https://www.wirelessthings.net/rf-mo...l-transcievers. These modules have a serial interface and are easy to use. You could definitely call them "transparent".

  5. #5
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    Default Re: Looking for "transparent" RF transceiver

    Thanks for the feedback.

    I just had an offer from AUREL. They will sell me the transceiver I initially found being (hopefully) the best for my need.

    I'll have a try with this one.
    Roger

  6. #6
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    Default AUREL RTX 868 UART Transceiver - these ones are really very easy to implement and use

    I just want to take a few minutes to give a short feedback about the use of the AUREL RTX 868 FSK (650201343G). I receive the ones from LINX too (see post #1) but I had to finish the project asap so I took the ones that arrived first ;-)


    Once I had set up my wired proto on the breadboards for 9600bps serial communication, I removed the three wires (RX/TX/GND) "implemented" the modules and...got into trouble.

    Name:  K640_20160804_114012.JPG
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Size:  105.7 KB

    Before I powered-up the proto, I realized the RTX modules need 3.6V max and most of my project are made for 5V (silly habit, maybe).

    So I started looking around the internet on how I would be able to shift voltage levels and found, ie,the BSS138 level converter. But I also found in our forum some people asking why 5V projects would not simply be powered in 3.3V; that's true...why not?

    Luckily all the components I use can be fed with 3.3V ; so I adjusted the PICkit's voltage and...it worked like a charm.

    Connections to the modules are very easy (Pwr, Enable, TX or RX and data) and, what I always like, the PCB's footprint has a pitch of 2,54mm.
    Name:  K640_20160804_122905.JPG
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    I tested the RF link over 180 meters across buildings without any problem.

    Last but not least, the module proudly works with...?
    Name:  K640_20160804_123411.JPG
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Size:  66.5 KB

    Actually, I paid $ 12,50 per module (came from POLAND).

    Voilą
    Last edited by flotulopex; - 4th August 2016 at 12:52.
    Roger

  7. #7
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    Default Re: AUREL RTX 868 UART Transceiver - these ones are really very easy to implement and

    Congratulations Roger!

    180 meters across buildings, at 868 @10mW is great!

    Ioannis

  8. #8
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    Default Re: Looking for "transparent" RF transceiver

    I have used this transceiver with the purpose of the ZigBee pairs, but not worked.

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