This is one of my current projects still under construction.
I started building it couple of months ago and is still under progress due to limited time availability.
mcHF is a standalone Software Defined Radio designed by a ham from UK, M0NKA (Chris) which is getting popular at an unimaginable pace. Unlike SDRs which requires a computer to operate, mcHF being a standalone SDR doesn't require a computer to operate with. It has its own processor, ADC, DAC etc. It has got a wide coverage all along from 3.5 MHz to 30 MHz and is capable of delivering 10 Watts of output power.
Coming back to the basics of Software Defined Radio, I have seen many getting confused between a Software defined radio and a Software controlled radio.Software controlled radios are nothing but the same analogue radios that we have been used to, but with a digital interface. Software is just used for controlling various functions of the radio. The functions like digital control of VFO, AGC, RF gain, AF gain, LCD display to show the frequency, SWR, power etc are some examples.
But on the other side, the working principle of a Software Defined Radio(SDR) is completely different.Here the software itself has been used to model the radio. In layman's terms, you could say that the building blocks that make a radio are implemented by Software program. Changing this software program can change the working of the radio completely. Say you have a software defined radio built to receive FM signals. You could just change the software inside to make it a AM, SSB or a CW radio without any changes in the hardware.
Most of the SDRs after down converting(some high end SDRs are exception) the receive frequency, they sample the signals i.e. they convert it to digital format consisting of just numbers. Digital wave forms which are nothing but a series of numbers can easily be processed by the processor. After this point, it is pure mathematics which does our job with the help of DSP. All the basic processes inside a normal radio like Mixing, Filtering, Noise reduction etc can be achieved in digital world with out much effort.
back to mcHF :)
mcHF consists of 2 boards, UI Board and RF board.
The UI board mainly consists of the processor (STM32F04), the codec(WM8731), the TFT LCD (HY28B) and other UI related components. The project is not available as a KIT. As of now, the boards along with the LCD can be bought from Chris(M0NKA), the designer of this radio. Below is the website of M0NKA where the order can be placed.
http://www.m0nka.co.uk/
And the components, in India can be sourced from
http://in.element14.com/
or
http://kitsnspares.com/
Few parts like the RF Power mosfets, torroids etc will have to be sourced from abroad. Both the boards are SMD double sided boards. Do not fear away from this project all because it is SMD. Both the boards can be assembled using a normal soldering iron following any of the many SMD soldering styles or may be by using a Hot Air soldering iron as I did. There are lots of videos available in Youtube showing different soldering techniques.
I would suggest not to take this project as your first Homebrew Transceiver Project since it is not a plug and play kind of kit. But if you have built any analog radios before, mcHF build will amaze you for sure :).
Below is the YouTube video of my mcHF UI board coming to life few months ago.
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