Down loads
Astronomy
Astronomy-PDF file Astronomy book written by me. Very helpful for learn Astronomy.Starting from elementry basics. (still not compleated)
Sidereal Time (36kb) :-If you have an interest in Astronomy or Astrology, this program is very useful. You have to input the Longitude of the location (degrees, minutes and seconds) and select East or West. Then input the date and time in UTC (GMT). Then you can get the Local Sidereal Time for that location in hour, minute and second with 24 hour basis.
Planet Nibiru-PDF file Around 1983 Nasa discovered a planet about 50 billion miles away from the Earth, and it is named as NIBIRU. You can read the details about it.
Budu Dahama
550 Jathakaya-contents, Alphabatical order (218 kb Acrobat file)
550 Jathakaya-contents (232 kb Acrobat file)
550 Jathakaya (23.7 Mb Acrobat file):- Very popular ancient Sinhalese Buddhist book.(998 pages) This is very helpful for every human.
Ancient Modulation System-PDF file Load Buddha communicated with humen in other worlds in the Universe.
Astronaut-PDF file First Astronaut recorded in the history in the Universe.
Dambadiva-PDF file I went to India for Dambadiva pilgrimage trip in March 2017. I wrote this article about this trip.
Lowada-Sangarawa (554kb Acrobat file):- Very popular ancient Sinhalese poem book written by Venerable Vidagama Maithree Nayakathera in 15th century. Including all 140 poems in Sinhalese language and their meanings in English. This is very helpful for every human.
Lowada-Sangarawa ( 55 kb - Acrobat file) All 140 poems in Sinhalese (without meanings)
Specific Gravity-PDF file First incidence recorded about Specific Gravity.
Electronics
Circuits-pdf file (1 Mb):- I collected electronics circuits as a hobby since 1957, when I was 8th year in the school. Later I started to copy in a book in 1968 and started to write in the computer around 2011Inductance (32kb) :- If you want to calculate the inductance of a single layer coil, use the upper half of the window. Enter the diameter and the length in millimeters and the number of turns. Then press "Inductance" button. With using the lower half of the window, you can calculate the number of turns. Input the inductance in micro Henrys and, diameter and length of the coil in millimeters. Then press "Number of turns" button
General
My Book - Vidu Nenin Lowa Dakinna (1.8 Mb - Acrobat file) This is a book written by me in Sinhala language and published in 2012.
The IDC Engineer's Pocket Guide - pdf file This is very useful book having lot of useful information.
Penicillin-PDF file First incidence recorded about Penicillin.
Ham Radio
HF/4S7VJ Log Book - XL file
This is my Amateur Radio log book started on the 21st March 1979. All my log books converted to XL file during 2021.
Antenna Heading - exe file
(48kb) :- This program calculates the best heading to turn your antenna for establish a
good contact on HF or VHF. Run the program and enter your Latitude and
Longitude. Then enter the Latitude and Longitude for the other station. When you run
the program in the next time, no needs to enter your coordinates again
because it is already saved in the Registry of your computer. You can get the
heading for your antenna (My Antenna Heading) and the antenna heading for the
other station also. Dipole - FPS (116kb)
Dipole-Metric (116kb):- If you have a restricted space
you can design a loaded dipole (HF) antenna for any shorter length for any frequency in the HF band
with the help of this program. This is a high-Q and
narrow band antenna because it's length is shorter than the normal dipole.
HF-Antenna installation by 4S7VJ - ppt file
I installed the 3 element 3 band HF yagi antenna (Cushcraft A3S)on the roof top of the RSSL shack with the help of
4S7KG, 4S7JL, 4S7BU, around 2005. This is a power point presentation for that installation.
HF/VHF-Antenna Book by 4S7VJ - pdf file
I constructed varies types of HF and VHF antennas since 1978. All practical data achieved with my
experence and some more practical antenna designs included in this article.
VHF-2m Yagi Antenna constructed by 4S7JL - pdf file
Loop Antenna - exe file
(44kb) :- This is high-Q, Narrow-band, Wide frequency range, directional
but low efficiency antenna. Suitable for restricted space.
It is possible for indoor use also but don't
do it. You must remember that nobody stay within few feet away from
the antenna, while transmit because RF radiation is harmful for human.
Enter the diameter of the loop, conductor diameter, operating
frequency and transmitting power output and press the button. Then you can get
the capacitance and the voltage rating of the tuning capacitor. You can get the
following information also :- Loop length, Q-factor, Efficiency, Band width,
Radiation resistance, Conductor loss, Loop inductance, Inductive reactance Locator-Sinhala (306kb):-
Open this pdf file and read the text.(This is written in Sinhala) Then you can understand
what is the Grid Locator or Location indicator or the world wide QTH-Locator. Locator (156kb):-
Open this pdf file and read the text. Then you can understand what is the Grid Locator or Location
indicator or the world wide QTH-Locator. My Locator (36kb):-
Run this program and enter your Latitude and Longitude with degrees minutes and
seconds and select N/S, E/W also and press "LOCATOR" button. Then you can get
the world wide QTH-Locator relevant to your location. Morse Lessons for RAE
:- Morse lessons available
here for three stages. First stage is the "Morse Code for Beginners" prepared by
4S7KG - Kule. This is having 27 lessons
starting from 5 wpm and speedup to 12 wpm including whole alphabet and all
figers. It is originally recorded in 5cassett tapes. It is available in
ten mp3 files. For download click
Tape-1A (1,858 kb) ,
Tape-1B (1,796 kb),
Tape-2A (1,847kb) and
Tape-2B (1,809kb),
Tape-3A (1,782kb),
Tape-3B (1,452 kb),
Tape-4A ( 2,066kb),
Tape-4B (1,864kb),
Tape-5A(1,806kb),
Tape-5B (1,858kb),
and the contents of those files available in a WORD file -
Tape-1 ,
Tape-2
Tape-3
Tape-4
and Tape-5 The second stage of Morse Lessons available as an
example of a CQ-call. It is also a mp3-file, for download click here
CQ-QSO (size:- 548 kb)
and click here for the
LIST (20kb) The third stage of Morse Lessons also an example QSO for a
directional call (576 kb) and click the link for download and click here for the
LIST (21 kb) Range (44kb):- With
using this program you can find out the shortest distance between two locations
on the Earth. Enter latitudes and longitudes for two locations and press "Range"
button.
Personal
Hiyare-PDF file I went to Hiyare, Galle around 2016. I wrote this article about new experience for me about Hiyare forest.
My Childhood (1321kb - Acrobat file) This is written in Sinhala language with using "Sinhala unicode (iskolapotha)" font, You can read the pdf file without that font. I wrote a small booklet in 1964 about my childhood. I included all important topics in this page.
My love story (1Mb - Acrobat file) This is written in Sinhala language with using "Sinhala unicode (iskolapotha)" font, You can read the pdf file without that font. This is my love story (worlds end trip)
Experience of My life (1Mb - Acrobat file) This is written in Sinhala language with using "Sinhala unicode (iskolapotha)" font, You can read the pdf file without that font. This is the experience of my life. I included all important topics in this page.
Karma vipaka of My life (1Mb - Acrobat file) This is written in Sinhala language with using "Sinhala unicode (iskolapotha)" font, You can read the pdf file without that font. This is the Karma vipaka of my life. I included all important topics copied from my childhood and Expirienc of life in this page.
Our Pets (2Mb - Acrobat file) This is written in Sinhala language with using "Sinhala unicode (iskolapotha)" font, You can read the pdf file without that font. This is regarding our pets in my life. I included details about all pets lived with us in my life time.
Ward-42 (267kb - Acrobat file) This is written in Sinhala language. This is one of my experience in the General Hospital Colombo in 2010. My son was admitted to the hospital for treatment and I was with him about six days and nights.
Poor man (24kb - Acrobat file)
Lokanthayen pasu (380kb - Acrobat file) This is written in Sinhala language by me about the problem in my marrage life and solved after 47 years. This is password protected
Fiction
Siril (141kb - Acrobat file) This is written in Sinhala language by me and it is is a true story about a friend of mine.
Lokavinasaya This is written in Sinhala language by me and it is is not a true story. It is a short story.
Gravity This is written in Sinhala language by me and it is not a true story.It is a short story.
Edited: 29th May Monday 2023