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.
I made my own 3-wire serial sniffer and got this patch (sniffed from DEGEN 1103 SSB receiver), so I can share it I think, but OK, wait for Silabs answer. Why do you think Si4735 works at 28-30, 50, 70 MHz bands? I am not sure
Thanks for your comment.
The frequency bands are just to document the bands, what we would like to get into our radio for beginners ... it's clear that the Si chips will only partially cover those bands, but, alike in other radio equipment, some additional down converter is expected to be used ...
That probably is even better, as pupils/students/adult learners can learn more about the system side of amateur radio equipment and where future developments will move forward .
Well, and on a very wellknown marketplace I found out, that those DEGEN / TECSUN and other radios are so cheap, that I even could delegate such a research to students :-) ... if that would not be illegal ...
Keep on ,mind - these Chinese radios with Si4735 have very weak strength drive
to SDI SDIN SCK pins from MCU (it is good for noise, but bad for sniffing), you need to solder buffers with short wires near to Si4735
" if that would not be illegal" - why? This patch even not encrypted, but it is not short - about 8 kilobytes length
well, that reverse engineering could fall under strict German laws about interlectual property rights and reverse engineering ... I need to let that check by lawyers, before I could use it somehow in teaching @University or even for ham radio purposes ...
Ohh.. I am from Russia.. But I hope Silabs not sue us
Well, depends on Russian laws about intellectual property and if they are forced by your courts ... if SiLabs would be able to track somebody ...
OK, will see
hello SiLabs, I am wondering, that no answer on that topic has been given, yet.
As my question is both aimed at academic and non-academic education to improve knowledge on general electronics and communication systems, I am indeed a little disappointed about the silence.