Communication Modes

What are the communication modes they use

CW – (Continues Wave) also known as Morse Code
CW is a primitive but perhaps the most reliable and effective way of Communication. Here the messages are sent and received by way of sound tones in combination of Dah and Dit such as dah-dah-dah dah-dit-dah means ‘OK’ initially it may sound like noise to you but later is music to your ears.

HF Communication (High Frequency – Voice)
In this mode of communication, one can communicate with any ham around the world by using their HF Sets. You can talk to a station in U.S.A or a station in Alaska or a station in Japan, anywhere in the world without any problem without any Cost (No Airtime expect for the initial cost of the equipment).You may talk for hours make new friends exchange information etc.. This mode of communication is by far the most popular and most wide used.

VHF Mobile Communication (Very High Frequency)
This mode of communication is very similar to the Mobile Telephones but with a difference, here there is no air time, you can carry your VHF Handy (Mobile Set) with you and can communicate with any ham in a radius of about 50 Kilo Meters. You can also communicate with far of stations with your handy with the help of the Ham Repeaters. You may be driving down to a nearby hill station and still keep in touch with other hams from your vehicle.

Satellite Communication
Ham Radio around the world is so popular that Hams have their own satellite network, they are known as ‘OSCAR’ (Orbiting Satellite Carrying Amateur Radio) Hams have as many as 44 Oscars at their disposal. Hams communicate globally with the help of this satellite, for example you can communicate with a station in Japan with your hand Set even if you are Mobile in your Vehicle. Hams have also been communicating with the MIR Space Station on regular basis. The International Space Station (ISS) is having an Amateur Radio and it is already functional. Hams around the world are known for experimenting with their radio Set. A step up on the evolutionary ladder of Hamming is the Moon Bounce, or Earth Moon Earth (EME)

Digital Communication
In this mode of communication, Hams interface their computer with their radio by using Radio Modems(Hardware or Software Modems) Once you are set you can do almost anything which you may do on the Internet, Such as Send Mails, Pictures, Data files, you can also have a video conferences. The application can be endless because tons of software is available (Mostly developed by Hams) for Digital Communication using Ham radio. Incidentally Linux has a complete module for Ham radio.

Internet & Intranet
Some people believe that ham radio is dying because of the arrival of the Internet. Actually it is quite the opposite, Ham radio and Internet compliment each other very well, When one merges both the worlds, the out come is beyond imagination. Just try to visualize if you were to replace your telephone lines with Ham Radio by using radio Modems. Incidentally the TCP/IP software was developed by a ham. Using Ham Radio you can connect to Internet and surf using any browsers like IE, Netscape etc.. You may be in a remote location like Saint Martin Island or Chittagong Hill Tracks, but if you have your laptop & a VHF set, you remain connected with Internet. Hams also have there own Intranet for local Digital communications.

Ham Radio is one of the few hobbies in the world which requires a government license. To obtain the license one has to go through a course as per the syllabus devised by the communication authorities, which help in acquiring the knowledge and proficiency necessary to communicate using a wireless transceiver without causing interference to the other radio communication services.

The course covers basic electronic radio theories as well as existing National and International rules related to amateur radio communication. The Amateur Radio Operator’s certificate (License) is awarded by the Bangladesh Telecommunication Regulatory Commission (BTRC). The examination is conducted at the BTRC premises.

There are nearly 3 million ham radio operators around the world.
Japan            13,50,127
U.S.A              6,74,652
Germany         78,581
England           62,093
Spain                59,352
Canada            45,000
Russia              38,000
Brazil               32,053
Italy                 28,833
France              23,693
Australia          22,965
India                15,000

What is Call Sign

Call signs are the shorter forms of unique names to use in corresponding among the radio operators. Many years ago, through an international agreement, the nations of the world decided to allocate certain Call Sign prefixes to each country. International Telecommunication Union (ITU) radio regulations outlined the basic principles used in forming Amateur Call Signs. According to their regulations, an Amateur call sign must consists of more than one characters and at first there can be a numeric character as a prefix and then there be a letter and again there can be a numeric one. The call sing must not be more than three characters long. The range S2A-S3Z has been allocated for BANGLADESH. After passing the exam you can get a Call Sign from this range.

What Are the Amateur Radio Bands and Frequency

Look at the dial of an old AM radio and you’ll see frequencies marked from 540 KHz to 1600 KHz. Imagine that band extended out many thousand kilohertz, and you’ll have some idea of how huge additional radio spectrum is available for the Amateurs, Government and Commercial radio bands. Here you’ll find all the aircrafts, shipping lines, fire service and police communications, you will also find the so-called “shortwave” stations, which are worldwide commercial and Government broadcast stations. Amateurs are allocated nine basic “bands” (i.e. groups of frequencies) in the High Frequency (HF) range between 1800Hz to 29700 KHz, and other seven bands in the Very High Frequency (VHF) bands and Ultra High Frequency (UHF) ranges, Super High Frequency (SHF) or microwave bands. Even though many Amateur Radio conversations may be heard around the world by anyone with a suitable radio receiver, given the right frequency and propagation conditions, Amateur Radio is basically a two-way communication system among radio amateurs.

Frequency Allocation from ITU (International Telecommunication Union) for Amateur Radio

HF    VHF / UHF    SHF / EHF
1800-2000 KHz
3500-4000 KHz
7000-7300 KHz
10100-10150 KHz
14000-14350 KHz
18068-18168 KHz
21000-21450 KHz
24890-24990 KHz
28000-29700 KHz
50 – 54 MHz
144 – 148 MHz
220 – 225 MHz
420 – 450 MHz
902 – 928 MHz
1240 – 1300 MHz
2300 – 2450 MHz 
3.300-3.500 GHz
5.650-5.925 GHz
10.00-10.50 GHz
24.00-24.25 GHz
47.00-47.20 GHz
75.50-76.00 GHz
76.00-81.00 GHz
119.98-120.02 GHz
142.00-144.00 GHz

What are the Radio Equipment

Around the world there are millions of HAMs using different types of radio. They always use the frequencies allocated by the International Telecommunication Union (ITU). Generally to communicate in short distance say within 10 to 50 kilometer you need to use VHF frequency. For that you need a VHF Walkie-Talkie. You can easily take it in your hand. You can get a VHF Walkie-Talkie for around 7,000 to 10,000 Taka. To communicate around the world you need to use HF band, for this you need a HF Radio. HF Radios are quite expensive starting from 25,000 to 80,000 Taka. There are several companies make these radios, like ALINCO, YAESU, KENWOOD, MOTOROLLA, and ICOM etc.

Around the world there are millions of HAMs using different types of radio. They always use the frequencies allocated by the International Telecommunication Union (ITU). Generally to communicate in short distance say within 10 to 50 kilometer you need to use VHF frequency. For that you need a VHF Walkie-Talkie. You can easily take it in your hand. You can get a VHF Walkie-Talkie for around 7,000 to 10,000 Taka. To communicate around the world you need to use HF band, for this you need a HF Radio. HF Radios are quite expensive starting from 25,000 to 80,000 Taka. There are several companies make these radios, like ALINCO, YAESU, KENWOOD, MOTOROLLA, and ICOM etc.

An Amateur Radio Station Setup

To setup a basing Amateur Radio Station, all you need an Amateur band Transceiver (transmitter & receiver), a power supply unit, an antenna system and a Logbook. Optional stations accessories e.g. SWR meter, Antenna tuner, Rotator, Clocks, Temperature monitors etc. can be used to enhance your operational environment. The simplest type of antenna used is a wire dipole antenna. One can use Beam antenna (Yagi & Log periodic arrays), Quad antenna, Loop antenna, and Vertical antenna to boost up the signal quality.

image_pdfimage_print

Related Posts

No related posts found...

Updated: July 12, 2017 — 7:22 PM
Bangladesh Amateur Radio League © 2016 Contact : RANGS Nilu Square (5th floor), Satmosjid Road, House # 75, Road # 5/A, Dhanmondi R/A, Dhaka-1209. Bangladesh Email : s21hq@barl.org