Ham Radio – The Advantage of DStar and DMR Modes

Ham Radio is a fascinating hobby, but what is the advantage of D-star and DMR modes.

There are many different interests within the umbrella name of Ham Radio. People communicate with other like-minded people around the World using the Internal Short Wave bands. Ham Radio Operators equipment include H.F., (High Frequency), transceivers covering several of the Ham Band allocations, and many use Yagi aerials with three, four and sometimes six elements, to not only transmit their power out to the receiving station, but also to receive weak signals form lesser equipped ham radio Operators using simple aerial systems such as dipoles or vertical radiators. These aerial elements can be thirty three feet long when covering the twenty metre Ham Band, if the elements are widely spaced between each other at say point two of a wavelength, the distance between the elements is four point two metres, a very large aerial indeed.

Many Radio Hams who I have spoken to around the World have sixty feet high towers with multi element aerial as described above. You need a lot of space for such an aerial, and planning permission to go along with it.

D-Star and DMR are Ham Radio modes which are gaining in popularity, because the problems associated with having a large aerial do not exist, signals on D-star and DMR do not rely of the ionosphere to propagate signal around the World, they use laser light and data packets used to facilitate the International World wide web.

Many elderly radio Hams who have moved from their long term family homes, into small apartments, where outside aerials are not allowed, are finding that their interest in communication can still continue, using D-star or DMR modes of communication. The digital mode also has a great advantage over traditional propagation. You need propagation to be working in your favour when using High Frequency bands. If there is no propagation on a particular Ham Band, you simply do not hear any signals. D-star and DMR modes rely on the efficiency of the Internet, offering Radio Hams Worldwide communication without the need for natural reflection and refraction of the transmitted signal via the Earth’s Ionosphere.

Handheld transceivers capable of Digital transmission are now freely available from many of the Ham Radio retailers. Their transmissions are converted from standard analogue voice signals via voice encoders built into the hand set, these transmissions are picked up via local repeaters that are connected with each other to form a Worldwide network, if you do not live beside a D-star or DMR repeater you easily can turn your home based computer into a repeater with inexpensive add-on technology, they do the same job as a nearby repeater does.

Why School Identification Cards Are Important

Most schools around the nation have started using school identification cards. This is for schools all the way from elementary schools to Universities. There are several reasons why they started using these identification cards. In this article we will tell you why school identifications cards are so important.

The main reason is for safety reasons. We have heard many stories how someone has went into a school and started shooting. We have heard stories of how children were kidnapped from schools. They had to come up with a system that would work to keep people out of the schools that did not belong there. This is where school identification cards came in. This has helped in a couple ways. One, if each student has an identification card then they can prove right away that they belong in that school. A lot of schools have even incorporated someone at the doors to check ID’s as they enter.

Also if someone visits a school they have to check in at the desk and receive a temporary identification card. A lot of times they will even take a person’s picture. This allows the school to know who is in the school and make sure they are there for a legitimate reason.

School identification cards for students are also useful to them because if provides them with options. They can use the cards to check out library books. They can use the cards for the lunch room. When a student pays for their lunch for the week or for the month it will be added to their card and they just slide their card each day to eat. It saves from a student having to carry money on them each day or a lunch worker having to keep track of who they have money for and who they do not.

The school id cards also can be used for the reward or the revoking of privileges. All of this can be kept on the card. Back to the library, a lot of schools give rewards to children for having read so many books. This information can be kept on the ID cards. They can scan the library card and know exactly how many books and what kind a child checked out.

These identification cards differ from school to school. Some just use a single edge card. Some are double edge and have an encoder incorporated in them. These are becoming more and more popular because they can be used for a lot more reasons.

As you can see the school IDs are very important to our schools today. They not only go a long way in keeping our children safe they also make it a more efficient way to run the schools. These school identification cards have been around for a while. They have just become more sophisticated with the advent of technology. They have come up with more and more ways that identification cards can be used to the school and the student’s advantage.