Thursday, April 1, 2010

QSL Cards

QSL is one of the Q codes used in radiocommunication and radio broadcasting. A Q code message can stand for a statement or a question. In this case, QSL means either "do you confirm receipt of my transmission?" or "I confirm receipt of your transmission". A QSL card is a written confirmation.

QSL cards confirm either a two-way radiocommunication between two amateur radio stations or a one-way reception of a signal from an AM radio, FM radio, television or shortwave broadcasting station. They can also confirm the reception of a two-way radiocommunication by a third party listener. A typical QSL card is the same size and made from the same material as a typical postcard, and most are sent through the mail as such.

Amateur radio operators exchange QSL cards to confirm two-way radio contact between stations. Each card contains details about one or more contacts, the station and its operator. At a minimum, this includes the call sign of both stations participating in the contact, the time and date when it occurred (usually specified in UTC), the radio frequency or Band used, the mode of transmission used, and a signal report. One national association of amateur radio operators, the ARRL, recommends a size of 3½ by 5½ inches (89 mm by 140 mm).

QSL cards are a ham radio operator's calling card and are frequently an expression of individual creativity — from a photo of the operator at his station to original artwork, images of the operator's home town or surrounding countryside, etc. They are frequently created with a good dose of individual pride. Consequently, the collecting of QSL cards of especially interesting designs has become an add-on hobby to the simple gathering of printed documentation of a ham's communications over the course of his or her radio career. Normally sent using ordinary, international postal systems, QSL cards can be sent either direct to an individual’s address, or via a country's centralized amateur radio association QSL bureau, which collects and distributes cards for that country. This saves postage fees for the sender by sending several cards destined for a single country in one envelope, or large numbers of cards using parcel services. The price for lower postage, however, is a delay in reaching its destination because of the extra handling time involved. In addition to such incoming bureaus, there are also outgoing bureaus in some countries. These bureaus offer a further postage savings by accepting cards destined for many different countries and repackaging them together into bundles that are sent to specific incoming bureaus in other countries.

For rare countries, that is ones where there are very few amateur radio operators, places with no reliable (or even existing) postal systems, including expeditions to remote areas, a volunteer QSL manager may handle the mailing of cards. For expeditions this may amount to thousands of cards, and payment for at least postage is appreciated, and is required for a direct reply (as opposed to a return via a bureau).

Source : Wikipedia, the free encyclopedia

QSL Card Example for printing

200 pieces for RM100

Tuesday, March 30, 2010

Strobe lights

Strobe light or stroboscopic lamp, commonly called a strobe, is a device used to produce regular flashes of light. It is one of a number of devices that can be used as a stroboscope. Strobe lights are used in scientific and industrial applications, in clubs where they are used to give an illusion of slow motion (cf. stroboscopic effect) and for aircraft anti-collision lighting. Other applications are in alarm systems, theatrical lighting (most notably to simulate lightning), and as high-visibility running lights. They are still widely used in law enforcement and other emergency vehicles, though they are slowly being replaced by LED technology in this application, as they themselves largely replaced halogen lighting. Strobes are used by scuba divers as an emergency signaling device. Strobe lighting has also been used to see the movements of the vocal cords in slow motion during speech, a procedure known as video-stroboscopy. Special calibrated strobe lights, capable of flashing up to hundreds of times per second, are used in industry to stop the motion of rotating and other repetitively-operating machinery and to measure the rotation speeds or cycle times.

Source : Wikipedia, the free encyclopedia

Voltage selection
LED color options
LED options
0.5W - Array Mode 1/2
Amount of Control Circuits
2 - Array Mode 1/1
LED Color Combinations
Flash Patterns
LED power
Instantaneous maximum current
Lamps No.
Maximum Input Power
9.6 W
Product Feature
Up and down buttons for flashing patterns
Net Weight
Gross Weight
Gross Weight
Package size
RM 430 including posting handling for Peninsular Malaysia

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