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Kollam Antenna Workshop 2010
Simplex VHF Communication Test - New Delhi
The HAM Slang
How to survive an Earthquake?
The "description" of TIME
Genesis Radio G-40 SDR
SET Exercise Kerala

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on 10 October 2010
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What is Software Defined Radio?

A Software Defined Radio (SDR) system is a radio communication system where components that have typically been implemented in hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors. etc.) are instead implemented using software on a personal computer or other embedded computing devices. While the concept of SDR is not new, the rapidly evolving capabilities of digital electronics are making practical many processes that were once only theoretically possible. The term "Software Defined Radio" was coined in 1991 by Joseph Mitola, who published the first paper on the topic in 1992. However software-defined radios have their origins in the defense sector since the late 1970s in both the U.S. and Europe.

A basic SDR may consist of a computer (PC) equipped with a sound card, or other analog-to-digital converter, preceded by some form of RF front end. Significant amounts of signal processing are handed over to the general purpose processor, rather than done using special-purpose hardware. Such a design produces a radio that can receive and transmit a different form of radio protocol (sometimes referred to as a waveform) just by running different software. Software radios have significant utility for the military and cell phone services, both of which must serve a wide variety of changing radio protocols in real time.

In the long term, software-defined radio is expected by its proponents to become the dominant technology in radio communications.

Software Defined Radio and Amateur (Ham) Radio

A typical amateur software-defined radio of home made design uses a direct conversion receiver and low power transmitter. Unlike direct conversion receivers of the more distant past, the mixer technology are now based on the quadrature sampling detector and the quadrature sampling exciter. The receiver performance is directly related to the dynamic range of the analog to digital converters (ADCs).
First generation SDRs used a standard PC sound card to provide ADC functionality. The newer software defined radios use embedded ultra-high performance ADCs that provide higher dynamic range and are more immune to noise and RF interference.

A fast PC performs the digital signal processing (DSP) operations using software which is usually amateur-written, specific for the radio hardware. The SDR software performs all of the demodulation, filtering - both radio frequency and audio frequency- signal enhancement. Uses include every common amateur modulation: Morse code, single sideband modulation, and a variety of digital modes.

Introducing GENESIS G40 : Amateur Radio SDR Transceiver Kit

GENESIS G40: 40m All-mode 5W SDR Radio Transceiver KIT
SDR G-40 G40 is a monoband 40m all-mode 5W SDR transceiver designed by YU1LM and produced and distributed as a kit by VK1AA of GenesisRadio.

Read More at:  

Genesis Radio SDR KIT G-40

Last Updated (Tuesday, 07 April 2009 01:43)

 
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Informal HAM Eyeball at Chennai on 12th April 2009

Informal HAM Eyeball at Chennai on 12th April 2009 As a precursor to the world amateur radio day coming up in April month (18th April) the Chennaihamsblogspot invites all the Chennai HAM's and SWL's to come together for the passion of this wonderful hobby under one roof in chennai for an informal eyeball on April 12th 2009 at 4:30PM onwards .


Its long time since Chennai has an interaction like this. The Address is as follows: Maharastra Education Fund Hall No.290, TTK road , Alwarpet , Chennai Opp to Ethiraj Kalyanamandapam.


The eyeball meeting is a casual interaction meet for all SWL's/budding HAMS to meet around with buddies to discuss on preparation plans to take up ASOL exams and also for all OM's to catch up old friends , have a chat etc.Its also an opportunity to share suggestions/ideas for the improvement of the blog site as well overall HAM activities in Chennai or any other subject related to ham radio.


Your presence for this get together will be the key to success of the event and a stepping stone for organising further HAM activities during 2009 in Chennai. For any further info/suggestions please call anyone below. Deepan /VU2DPN/9840790506 Vipin /SWL/9840873578 Devdas /VU2DH/9841015516 Sathyan /VU3MES/9840988517 Hope we all have a wonderful interactive session during the eyeball.



More Info on Chennaihamsblogspot

Last Updated (Tuesday, 07 April 2009 01:42)

 
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SET(Simulated Emergency Traffic) Exercise Conducted
in Kerala on 26.04.2009 - A report

The SET(Simulated Emergency Traffic ) went well. I feel we could have done better with better preparation.

We decided only non the type of emergency (Earthquake) and left the rest to VU3ULL OM Shaji and VU2OJ OM Abraham to be at their creative best and they seem to have done well. It would have been nice if we had officials along as that could have assured of real time official communications as in a real case.

The Table top (Sitting in shack and simulating)SET was planned for 11.05 Hrs and started on schedule by ULL sounding the alarm. The resource net was handled by VU2KGB OM Girish efficiently and supported by VU2RDN OM Ravi and VU2ADV OM Jacob.

Nobody was let into the secret on what emergency would arise and how stations should respond. All that was left to the stations to decide. They were assigned tactical callsigns based on their proximity to critical locations.

We had stations from all across kerala most of them on RF link to VU2BCM repeater and some on echo link. We had three stations from Delhi,VU3FUN OM Rajesh, VU2XLZ OM Frank and VU3GTF OM Karan, standing in for the National Disaster Management Authority.

We had a station at Trivandrum VU2JQX OM Anil for the state Disaster Management Authority. We had stations operating from all District Head quarters designated as the collectorate, Hospital and Police control Rooms. We had a station exclusively standing by for co ordination with railways at the DRM office at Palakad VU2 PJP OM Peter.

There was parallel operations in all districts on local repeaters and simplex frequencies. The traffic was sorted out locally and passed on to the SET net on 145.650 VU2BCM repeater.

There were stations standing by in tamil nadu to handle any possible welfare traffic. Even though the traffic handled was not the kind that we will have to handle in an emergency, large volume of traffic was handled. We could not generate large text messages for transmission which would have tested our effectiveness.

The SET was wound up after 1.5 Hrs as there was a possibility of panic amongst public. We had stations from bangalore calling up on phone regarding any calamity and thought it right time before any unfortunate development.

Wish to thank all stations for the Co operation.

73's

VU2ADV Jacob Elias

Please Note: That the following recordings are representation of a imaginary simulation of a disaster scenario.The objective of this mock simulation is for making awareness among HAM community on emergency traffic handling and do not serve the purpose of education or training on emergency traffic handling, therefore these recording should not be used as representation of actual emergency traffic handling by HAMS.

Listen to the Live Recordings for the SET exercise on 26.04.2009 : By IndiaHamS.com

Click on the Green Color Play Button below to listen to the files (In mp3 format)


File-1

File-2

File-3

File-4

File-5

File-6

Last Updated (Friday, 01 January 2010 20:35)

 
IndiaHamS.com - Ham Radio Lives ! | Ham Radio India | Indian Amateur Radio Website Home

The HAMFEST is over .... some of the pictures of the HAMFEST Bangalore 2009 are published on picasa, links given below:

The HamfestIndai 2009 in Bangalore went very well almost 700 delegates attended in it.All enjoyed the eyeball.It was represented by many states of india.Congratulations to the Hamfestindia 2009 committee members and Bangalore Hams for making the hamfestindia 2009 a remember one to all Delegates.

Next Hamfest2010 will be in Pollachi IN Tamilnadu. Vu2WDP om Vijayan and his Team of Pollachi are the Main persons who Takes the Next hamfest to Pollachi in 2010.

As per :  vu3iti - varadan

The 18th Hamfest India event is being conducted in Bengaluru city, Karnataka, on 7 & 8 November 2009. The venue for this gala event is none other than the same place where the biggest Hamfest event in India happened in the year 1998 bringing more than 800 delegates from all over the country.

The venue is Sri Nijagunara Kshetra, opposite to Bull Temple, Basavanagudi, Bengaluru.

Delegate Registration Details:

You may register as a deligate individually or jointly with your spouse and / or children. The delegate fee details are as below:

Invidual Ham / SWL: INR.450/- (USD 10 for foreign delegates) Accompanying Spouse: INR.350/- (USD 8 for foreign delegates) Accompanying Children above 10 years of age: INR.350/- (USD 8 for foreign delegates) No delegate fee for children below 10 years of age The delegate fee may be paid by Demand Draft / Banker's Cheque / Cheque, in favour of HAMFEST INDIA 2009, payable in Bangalore City.

The delegate fee along with the completed Delegate Registration Form should be sent to:

Hamfest India 2009 C/o Linux Learning Centre No.635, 6th Main Road, Adjacent to Bank of India, Hanumanthnagar, Bangalore - 560019, India.

Accomodation Booking Amount: If you require accomodation booking, the booking amount as indicated in the Delegate Registration Form, should be added along with the delegate fee amount. One single Cheque / Demand Draft may be sent for the combined amount.

For more details visit the official Hamfest India website   http://hamfestindia.com/

Last Updated (Saturday, 14 November 2009 11:59)

 
IndiaHamS.com - Ham Radio Lives ! | Ham Radio India | Indian Amateur Radio Website Home

The Puranas

The length and breadth of India is strewn with temples that have a startling commonality of themes. Increasingly, I do not believe the Puranas, the books that describe these themes, are merely fictions of men of old. Rather, they seem to describe a human history more primal than the one of a few thousand years to which we habitually think of ourselves as belonging. In the Puranas, we see reflections of a cosmic history, when this earth was open to the universe. The beings we meet in the Puranas are godlike, grandly demonical and incomprehensible when we compare them to our-selves. They live for thousands of years, fly in sky chariots and com¬mand great astras:

In the Puranas, we find this description of time...: The basic unit of life is the nime-sha, the instant. Fifteen nimeshas make one kastha, thirty kasthas one kaala, thirty kaalas one muhurta and thirty muhurtas one day. Thirty days is a maasa, a month, which is one day of the gods and ancestors; six maasas make an ayana, two ayanas a year. One human year is a day and a night for the celestials, uttarayana being the day and dakshinayana the night Three hundred and sixty-five human years make a divine one.

Four are the yugas in the land of Bharata: the krita, treta, dwapara and kali. The pristine krita lasts 4,800 divine years, the less perfect treta 3,600 years, the half-cor¬rupt dwapara 2,400 and the almost entirely evil kali 1,200. A chaturyuga, one cycle of four ages, is 12,000 godly years long, 12,000 x 365 human years. 71 chaturyugas make a manvantara, 14 manvantaras a kalpa. A kalpa, of 1,000 chaturyugas, 12 million divine years, is one day of Brahma, the Creator. 8,000 years of Brahma make one Brahma yuga; 1,000 Brahma yugas make a savana. Each Brahma lives for 3,003 savanas. A day of Brahma's has 14 lndras, his life 54,000 Indras. One day of Vishnu is the lifetime of Brahma. One day of Siva is the lifetime of Vishnu...

Can it be that our past was more than what we think? Was it, in its way, inconceivably superior to the present? By the Puranic calendar, we live today at the outset of a kali yuga. Thus, Rama lived in the world more than 800,000 years ago and Krishna 5,000, at least: the first in the treta yuga and the sec¬ond at the end of the last dwapara yuga. According to the Puranas, it is natural for men of the kali yuga to be puny and short-lived and for them to forget the Sanatana Dharma and the eternal Gods. For this is the very nature of the evil age. It is the time when our darkling planet is sealed from the rest of the universe. The sacred Puranas have come down to us in the great oral tradition of the rishis, the sages of Bharata¬varsha. Once, the peerless Vyasa composed them from 'ancient mate¬rial': ancient for him. Traditionally, a Purana deals with five subjects, called panchalakshana: the primary creation of the universe; secondary creation after periodic destruction; the genesis of the devas and rishis; great epochs of time, the kalpas, manvantaras, yugas; and the history of some royal dynasties of the earth.

More recently, after 4000 BCE,until 1000 CE, roughly, a lot of other material has grown around the central Purana. These concern rituals for sacrifices, other customs, festivals, caste customs, specifications for temple construction, etcetera. There are 18 principal surviving Mahapuranas. The Siva Purana is one of these. They are collections of revelations, in the form of stories, or otherwise, usually narrated to some rishis by a suta, who heard them from Vyasa, who heard them from Narada, Brahma or another fabulous raconteur, in time out of mind. They have come down, invariably, in Sanskrit couplets. The Puranic tradition is mainly lost to those of us that do not know Sanskrit... The days when we would hear them at our grand¬mothers' knees are over. We know less of them than our parents did and our children shall know even less than we do. These luminous stories are our race's very soul.

Excerpted from the Introduction to Ramesh Menon's book, The Siva Purana: a modern rendering

Last Updated (Tuesday, 03 November 2009 21:26)

 
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Kollam Antenna Workshop 2010
19-Jan-2010
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13-Jan-2010
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Misc. Videos
20-Apr-2010
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Delhi Hams Picnic 2010
13-Jan-2010
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Delhi Hams Picnic 2010
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Delhi Hams Field Day 2009
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Kollam Antenna Workshop 2010
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Delhi Hams Field Day 2009
29-Mar-2009
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Kollam Antenna Workshop 2010
19-Jan-2010
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Kollam Antenna Workshop 2010
19-Jan-2010
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