Michael Hehn asked:


Ham radio has a long and important history. As society and technology continue to move on to new things, a small segment continues to enjoy the hobby as well as to educate and help during disasters.

WHAT IS HAM RADIO?

Ham radio is the the term coined for amateur radio enthusiasts who learn to operate radios as a hobby or for practical use. Hams – as operators are called – can use various methods for transmitting messages including Morse code via telegraph, voice transmission via radio or messages through a computer. New methods of transmitting television allow for images to be received around the world by hams. Some hams have contributed to the development of new technologies for other uses.

The term ‘ham’ has unknown origin although there are several theories.

WHO USES HAM RADIO?

Ham radio operators can be anyone – doctors, homemakers, truck drivers – who enjoys communicating with new friends. Hams can talk across town or around the world.

Ham radio was used by the military in the World Wars and by ships. The well known ‘SOS’ is just one of the codes that operators use to relay messages to one another.

In emergencies ham radio operators volunteer to assist with transmitting messages when normal communications are unavailable.

So far, we’ve uncovered some interesting facts about ham radio. You may decide that the following information is even more interesting.

Hams are all over the world – even in space! While in orbit or on the space station astronauts have spoken with other operators as well as children, teachers and parents. The program is called ARISS, Amateur Radio on the International Space Station.

Hams are young and old, men and women and of every background and occupation.

WHAT DO YOU NEED TO START?

In the United States you must obtain a license from the FCC (Federal Communications Commission).

To be licensed by the FCC you must pass an exam. The exam is administered by a volunteer ham operator and you are then mailed your license. You can often find websites or groups where you can locate a tutor who will answer questions or offer instruction before you take your exam. One such resource is the ARRL website. The ARRL is the National Association for Amateur Radio and provides training and resources for getting started as well as updates and news for the ham radio community.

HOW MANY HAMS ARE THERE?

The ARRL site claims over 170,000 members. FCC licenses have been issued to over 600,000 individuals in the United States and there are over 3,000,000 hams in Japan and many more throughout the world according to statistics found at ah0a-Site.

With so many people to talk to, there are even competitions to see how far away you can transmit and many other events within the community.

The day will come when you can use something you read about here to have a beneficial impact. Then you’ll be glad you took the time to learn more about ham radio.

himfryang asked:


I want to introduct something about Wine Thermometer (JWW). * The wine thermometer is of delicate style which can be easily inserted into a wine bottle to measure temperature * It can not only help people to find a desirable temperature to drink, but Also create some fun * Nominal range: (0-30/0-40)C * Scale division: 1C * Fillings: Organic liquid * Total length: 130mm * Material of the top decoration: Brass (chrome platin

(Redirected from 2 Meters)

The 2 meter amateur radio band is a portion of the VHF radio spectrum, comprising frequencies stretching from 144.000 MHz to 148.000 MHz in ITU Regions 2 (North & South America plus Hawaii) and 3 (Asia and Oceania) and from 144.000 to 146.000 MHz in ITU Region 1 (Europe, Africa, and Russia). The license privileges of amateur radio operators include the use of frequencies within this band for telecommunication, usually conducted locally within a range of about 100miles (160km).

Operating on 2 meters

Because it is local and reliable, and because the licensing requirements to transmit on the 2-meter band are easy to meet in many parts of the world, this band is one of the most popular non-HF ham bands. This popularity, the compact size of needed radios and antennas, and this band’s ability to provide easy reliable local communications also means that it is also the most used band for local emergency communications efforts, such as providing communications between Red Cross shelters and local authorities. In the U.S., that role in emergency communications is furthered by the fact that seemingly every amateur-radio operator has a 2 meter mobile radio or walkie-talkie.

Much of 2-meter FM operation uses a radio repeater, a radio receiver and transmitter that instantly retransmits a signal over a longer distance. However, even without repeaters available, it provides reliable crosstown communications throughout smaller towns and that makes it ideal for emergency communications. Simple radios for FM repeater operation have become plentiful and inexpensive in recent years. A fully-functional FM transceiver and antenna can be obtained for under US$200 new and far less used for a modern one.

DX

While 2 meters is best known as a local band, there are many opportunities for long distance (DX) communications. Occasionally, bending in the atmosphere’s troposphere (ducting) can allow 2-meter signals to carry hundreds of miles. This is called a lift.

In rare cases, Sporadic E propagation can bring contacts well over a 1,000miles (1,600km). 2 meters is also utilized in conjunction with 70cm (Mode B or V/U) on some amateur radio satellites, giving distances of up to around 3,000miles (4,800km) with a Low Earth Orbit satellite.

A set of 2 long Yagi antennas for the 2 meter band fed in phase to obtain more gain and narrow main lobe of radiation (WA6PY)

By speeding up Morse code using an audio tape recorder, or using a computer, very short bursts of signal can be bounced off the ionized gas trail of meteor showers allowing DX. This is often called Burst transmission.

Another phenomenon that produces upper atmosphere ionization suitable for 2M DXing are the auroras. Since the ionization persists much longer than meteor trails, regular audio signals can be used, but the constant movement of the ionized gas leads to heavy distortion of the signals causing the audio to sound ‘ghostly’ and whispered.

To communicate over the longest distances hams use moonbounce. This involves high power and good antennas to reflect the VHF signals off the moon. VHF signals normally escape the earth’s atmosphere, so using the moon as a target is quite practical. Due to the delay of the signal traveling to the moon and back, a person transmitting may hear the end of his own transmission returning.

Links to 2m propagation sites

DX-Sherlock’s real-time 2m propagation maps

DX-Sherlock’s real-time VHF&up propagation ticker

References

^ US Amateur Radio Frequency Allocations. http://www.arrl.org/FandES/field/regulations/allocate.html accessed 12 May 2008.

^ RSGB UK band plan. http://www.rsgb.org/spectrumforum/bandplans/RSGB Band Plan master.pdf or http://www.rsgb-spectrumforum.org.uk/Papers/RSGB Band Plan master.htm Accessed 14 May 2008.

^ Sharing spectrum with other services a ham radio reality. The ARRL Letter, Vol. 20, No. 2. http://www.arrl.org/arrlletter/01/1102/ Accessed 14 May 2008.

^ http://www.rsgb.org/getlicence/#foundation RSGB licensing guide

^ http://www.rsgb.org/emergency/ RSGB Radio Emergency & Public Service Communications website

Very high frequency (VHF) and ultra high frequency (UHF) amateur radio bands

VHF

UHF

6 m

4 m

2 m

1.25 m

70 cm

33 cm

23 cm

13 cm

50 MHz

70 MHz

144 MHz

219220 MHz

420 MHz

902 MHz

1.24 GHz

2.32.31 GHz

54 MHz

70.5 MHz

148 MHz

222225 MHz

450 MHz

928 MHz

1.3 GHz

2.392.45 GHz

Categories: Amateur radio bands(and so on) To get More information , you can visit some products about health protecction instrument, virtual digital multimeter, . The Wine Thermometer (JWW) products should be show more here!

mpvids asked:

. Since I had my cell phone with me, I decided to make a video of my setup. This video was not planned, so please excuse the cell phone video quality. HF is still somewhat new to me because I upgraded to General in 2007. The hobby is just something I play around with on occasion. I’m not very active. I got involved with Ham Radio for a last resort means of communication in the mountains. I have a 2 meter handheld that I carry while camping and hiking. … yaesu 857 ft-857 amateur ham radio …

mrantisocialguy asked:

enables the listener/viewer to learn Morse code – yes all the letters and numbers are in there! The video lasts about 20 minutes and there are 19 musicians playing in three different musical styles (French Musette, Viennese Waltz and German Oompah). The music changes key 24 times which means that this musical work may get into the Guinness Book of World Records! You can view the first quarter (about 5 minutes) of the video for free at www.hamband.com … Ham Radio Amateur Country Music …

hamguy17 asked:

www.hamradiofinds.com This was the scene recently at Dave’s place W5SV, just north of Austin, Tx., where a Hy-Gain LP-1010 14 Element Log Periodic ham radio antenna was repaired while on top of a 70ft free standing tower, with the help of a crane..When the antenna was raised onto the tower,l one of the forward elements got tied up with the boom of the crane..No damage was done to the LP, though it caused the element to be out of alignment with the rest of the elements..We sent Tim KE5CFZ …

radiovoice37 asked:

Ham radio operators N2JMH Jim and N2WVK Todd constructed this amateur radio contest ROVER. Roving and hilltoping during contests won the rover many awards. the rover was equiped to cover all bands from 50mhz to 10 ghz and lazer light contacts. We operated modes didital,cw,fm and ssb phone. There is 2 full stations to accomidate 2 operators all bands. 3 rotating masts allowed for multiple contacts fast while grid hopping. One stack was fully rotatable while on the fly and multiple vertical …

Abhishek Agarwal asked:


Radiosport is a term that can be used as only a single word or two different words. It is used to refer to the “ham” or the radio equipment used by amateurs for playing radio controlled games. These games could be group or single person events. It can also involve external competitors in a real time race or a performance of some sort over a period of time.

These contest, usually sponsored events, last from as less as a few hours to a few days. World wide being two days long. It can be local or it may even involve traveling some distances. It can range from contests that last only for a few hours to contests held cumulatively for many weekends. Each event has its own set of rules including which regions or stations can participate and more.

This is popularly known as radiosports. A few contests are listed.

Dx-Contest:

This involves stations making contact in a two manner with as many other stations as possible covering the longest distance they can. Today, this is popularly known as the International DX contest. People are given awards for the following. The ‘Worked All States Award’- given if the entrants contact at least one person from every state present in the USA. Similarly the “Worked All Continents Award’ is given away if someone from all the continents are contacted. The “Worked All Zones Award” follows the same logic for different time zones. The other awards are DX Century Club award, and VHF/UHF century club award.

One other event is Amateur Radio Direction Finding with the help of radios. It involves finding a definite number of transmitters from a definite location in a map, all before arriving at the finish line. This requires good athletic ability as well as direction finding skills with radios.

Bunny hunting or Fox Oaring: This, though similar to the aforementioned contest, involves ham’s short range equipment and hence more direction finding skill of the contestant as compared to athletic ability. There is larger technicality in this contest. As the radio can only detect signals within a 100 m radius, the contestant must identify the hidden transmitter in an area or radius 200 meters.

Radio Orienting contest: this is a severely restricted game played in compact areas. Very large technical skill is required to play this game.

Another form of bunny hunting utilizes vehicular transportation over long distances. The hams travel in the vehicles to the required region and locate the transmitter. Whoever can find the transmitter and reach the end line first is the winner. In another, the person who finds a specific number of hidden transmitters from different places first, wins. For this, traveling skill, equipment efficiency and orientation skill should be good.

These events are referred to as ARDF contest, abbrevatiation for Amateur Radio Direction Finding Contests. Radio sports and contests are only one side of the hobby. It is not necessary to enter contests. However many people get obsessed with this and start collecting dozens of winning certificates. At the other end of the curve are people who use the ham for their own communication and satisfaction.

One significant thing that can’t go without mention is that hams often contact space stations. There are many astronauts who become licensed radio operators and utilize the radio for educational and emergency purposes.

Once spanning just a small region within a given radius, the ham has now penetrated even space. Initially only based on Morse code, this has evolved into variations including digital transmission, voice etc. Radio transmission has indeed changed a lot in the recent years.

hamguy17 asked:

www.hamradiofinds.com Hello..This is Mel WA5UTK..Here is a short video showing the Elecraft K-3 being demostrated on 10 meters..The operator was John W5JLR who just recently completed his kit & wanted to show the radio in operation..He was in QSO with Ed N4KNO..I don’t know all the ins & outs of this radio, but it sure looked impressive..

30AT252 asked:

TV12 inside the HAM radio activity By www.dxman.tk

f1lby asked:

Here’s the official trailer for the movie ‘Making Waves’ by the late Nicolas Van Pallandt. Reviewed in Radcom Dec 07, this movie is not so bad (at least it’s based on Ham Radio!). If you can deal with the colourful language and bad operating practices then this film is well worth watching!