Pune Hams along with IEI PLC, IETE & Tech Forum celebrated the 164th birth anniversary of Sir JC Bose, Father of Radio, on Wednesday 30th November 2022 in Firodia Auditorium of Institution of Engineers (I) Pune Local Center Shivaji Nagar Pune
The theme selected this year by Pune Hams was Be curious, experiment, learn and succeed
Based on above theme, the project selected this year was uSDX SDR QRP Transceiver
Chief Guest speaker Mr Vishwas Kale, MD, Vijayesh Instruments Pune will gave 39th Tech Talk about Sir JC Bose’s life sketch & explained in detail How he invented various things with limited resources.
Sir JC Bose Microwave experiment
So far the world was under the impression Marconi is the Inventor of Radio. Now it is proved, Sir JC Bose is the father of Radio please watch following Video created by Vigyan Prasar on *Sir JC Bose*
Mr Vishwas Kale launched Pune Hams VU2RCP Website www.vu2rcp.in
Thanks to OM Kunal Gautam VU3YEJ for creative website
The live demo with construction details were shared by OM Sooraj Shenoy VU3ZAG about uSDX SDR transceiver, a simple and experimental (Class-E driven) SSB and CW SDR transceiver . It can be used to make QRP SSB contacts, or (in combination with a PC) used for the digital modes such as FT8,
An introduction on Software Defined Radio (SDR) technology was presented. Discussion was carried out regarding driving factors of SDR it’s basic blocks, IQ signal theory generation and digital signal processing. A demonstration was given on uSDX radio transceiver with explanation of its working principle and features. uSDX is a new open source, home brew multi band, multi mode QRP transceiver that grew out from parent QCX transceiver. Through some complex engineering it retains an efficient class E RF amplifier for SSB and digital modes. It crams impressive SDR capabilities into an Arduino.
This has an international development process conducted on https://groups.io/g/ucx/topics with contributions by many global Hams, including Guido Ten Dolle PE1NN, Barbaros Asuroglu WB2CBA and Manuel Klaerig DL2MAN.
The QCX was the base for the QCX-SSB which started with a QCX and modified the circuit and software to add SSB capabilities. The idea that Guido accomplished uses pulse width modulation of the PA supply voltage to control the amplifier in an Envelope Elimination and Restoration (EER) technique. To generate SSB, a DSP algorithm samples the audio input and performs a Hilbert transformation to determine the phase and amplitude of the complex signal. The phase changes are transformed into temporary frequency changes which are sent to the clock generator. This results in phase changes on the SSB carrier signal and delivers a SSB-signal with the opposite side-band components attenuated.
On the receive side a direct conversion SDR receiver is used with the I and Q signal digitized and all further processing carried out digitally. Attenuators are included to help not overload the ADC range. The support and source page of the project is
https://github.com/threeme3/QCX-SSB
The Home brewing of such a project is the real tribute to Sir JC Bose.
Pune Hams VU2RCP always support Made in India
.73’s
Vilas Rabde VU2VPR
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