Hello everybody @SiLabs,

 

since quite a while we are using simple receiver kits e.g. with Si4735 chips to push students of all ages to become interested in communications and amateur radio. I also do this in my main job - as an University professor.

As we would like extend our experiences and teaching in the future, we would like to ask (what had been asked before years ago), if there would be the possibility to receive a patch for one of those chips covering shortwave bands to enable single side band and/or reception of ASK/FSK/xPSK signals.

We would like to design simple receiver kits for training purposes, if possible completely under open source. Those cheap and simple kits should support interest in (shortwave 1,8-28 MHz, and low VHF bands 28-30, 50, 70 MHz) communications and revive a little our ham spirit with homemade equipment.

 

Well, we hope for an answer different from "sorry, that patch is available only for a specific customer"...

An alternative could be as well, if SiLabs could issue a (patched) chip variant for amateur radio use and make it available for licensed amateurs in general or through national amateur radio associations.

 

To support this aim, I can offer our participation in documention and sample hard and software design to reach our goal.

 

best regards,

 

Jürgen

 

 

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  • First version is simply double conversion receiver, only case and "Degen" label is same Robot Happy

     A few days ago I bought PL-660 from Tescun with USB and LSB , works fine. Not big different from DE1103 with Si4735, but Si4735 is not OK for me because AFC - I need very stable heterodyne, with syntezer. (And of course, I am going to build my own with Silabs  Si5351 as syntezer, but it is offtopic Robot Happy 

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  • DASM wrote:
    Interesting.. Degen 1103 actually is not pure SSB receiver ...

    Well,

     

    is it quite different from the first version of the DEGEN1103, I am not sure, but you most probably have read the reviews and analysis already done?

     

    http://swling.com/blog/2015/11/the-new-degen-de1103-dsp-first-impressions-review/

     

    http://radioaficion.com/news/andi-provides-detailed-info-and-photos-of-the-new-degen-de1103-dsp/

     

    http://vcfm.ru/forum/viewtopic.php?f=9&t=130&start=1230

     

    http://pup.doorblog.jp/tag/DE1103

     

    https://groups.yahoo.com/neo/groups/de1103/conversations/topics

     

    ..and many more ...

     

     

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  • Interesting.. Degen 1103 actually is not pure SSB receiver, it can receive upper and lower side simultaneously. But Tescun PL 880 can receive USB and LSB separately. And it contains Si4735, (but only for SSB demodulation, not complete receiver). Maybe Fw patch is different from 1103.. but maybe they playing with quartz filter by tuning BFO below and above filter response curve (it is double conversion superheterodyne and Si4735 acts as 2nd IF demodulator)
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  • yake wrote:
    Hi Jürgen Thanks your advices and I can understand your feeling.Actually SI473x chip is just design for radio tuner before. It’s not fit to use in ham radio application...

    Well, another proposal:

    As you might now, in a lot of countries, on permanent or temporarily basis, an amateur band around 70MHz has been opened to use.
    Could you probably support a Si4703 to be patched to work from 70MHz and in CW/SSB and/or narrow band FM ?
    This would not be in conflict with your AM radio customer, but would open a small path for ham radio ... and you could test reliability of ham radio developers/hobbists, if you have doubts  ...

    Best regards,
    Jürgen


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  • DASM wrote:

    Look attachment

     

    /*p216 AN332*/
    In order to support interim updates to the device component, patches can be applied to the component by the
    system controller via a download mechanism. Patches can be provided by Silicon Laboratories to customers to
    address field issues, errata, or adjust device behavior. Patches are unique to a particular device firmware version
    and cannot be generated by customers.
    Patches can be used to replace a portion of the component (to address errata for example) or to download an
    entirely new component image (to allow a customer to test a new component release on their device prior to
    receiving programmed parts).
    Patches are tagged with a unique identification to allow them to be tracked and are encrypted requiring the
    customer to use a tag when downloading to allow the Si47xx to decrypt the patch.
    Prior to downloading a partial patch, the user must confirm that the device contains the correct firmware and library
    to support the patch.

     

    Thanks, it will help experimenters a lot ... I will check against mine, when I finally will open my radio as well :-) ... still to many lectures ahead and too less time for research - but our summer break comes closer :-) ...

    Of course, when SiLabs finally would start to support it officially by documents and sample code, it becomes much better ... Unfortunately, a lot of companies have still not discovered the big potential of open source code and open documents to driver technical development and increase the market share of their chips ... 


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  • Look attachment

     

    /*p216 AN332*/
    In order to support interim updates to the device component, patches can be applied to the component by the
    system controller via a download mechanism. Patches can be provided by Silicon Laboratories to customers to
    address field issues, errata, or adjust device behavior. Patches are unique to a particular device firmware version
    and cannot be generated by customers.
    Patches can be used to replace a portion of the component (to address errata for example) or to download an
    entirely new component image (to allow a customer to test a new component release on their device prior to
    receiving programmed parts).
    Patches are tagged with a unique identification to allow them to be tracked and are encrypted requiring the
    customer to use a tag when downloading to allow the Si47xx to decrypt the patch.
    Prior to downloading a partial patch, the user must confirm that the device contains the correct firmware and library
    to support the patch.

     


    // CMD ARG1 arg count ARG2 ARG3 ARG4.. ARG7 (if any)
    const char Si4735_patch_for_SSB_reception[] = {
    0x15, 0x00, 6 , 0x03, 0x74, 0x0b, 0xd4, 0x84, 0x60, /* PATCH_ARGS* Reserved command used for patch file downloads.*/
    0x16, 0x6f, 6 , 0xae, 0x6c, 0xf9, 0xbb, 0x84, 0xa2, /* PATCH_DATA*/
    ....

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  • yake wrote:
    ... It’s not fit to use in ham radio application....

    well, just in the official using mode it is used in several learning and DIY radio applications, what are "officially" missing SSB reception. It is good for learning, by example to receive ham radio projects like German radio magazine transmission sunday's on 6070kHz  and for normal FM radios with RDS use. But still, much more interesting are bands from 100kHz to 30MHz, and in this area your chips are quite special without a lot of competition ...

    The Russian movie shows very well, that is working and that hobbiests like ham radio enthusiasts can use it.


    I found another brand-ATS1846 chip,

    Well, if you mean RDA1846, what is used in VHF/UHF radios e.g. by BAOFENG , we know as well, but they do not offer necessary details to use them for anything else than FM voice, what is limiting their use for learning very much ...

    Regards,

    J.
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  • Hmm, well, my Russian language knowledge is practically not existing, but the pictures, sounds and actions are clear enough ... well done.

    Is is not on SiLabs demo boards ?

     

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  • Another one russian with SSB on Si4735 https://youtu.be/pEiingHSjXI
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