A homebrew QRP low-power transmitter and receiver that fits inside an Altoids tin.
In amateur radio, QRP operation refers to transmitting at reduced power while attempting to maximize one's effective range. QRP operation is a specialized pursuit within the hobby that was first popularized in the early 1920s. QRP operators limit their transmitted RF output power to 5 W or less regardless of mode (Some call 10 W on Phone QRP) .[1]
Reliable two-way communication at such low power levels can be challenging due to changing radio propagation and the difficulty of receiving the relatively weak transmitted signals. QRP enthusiasts may employ optimized antenna systems, enhanced operating skills, and a variety of special modes, in order to maximize their ability to make and maintain radio contact. Since the late 1960s, commercial transceivers specially designed for QRP operation have evolved from vacuum tube to solid state technology.
A number of organizations dedicated to QRP operation exist, and aficionados participate in various contests designed to test their skill in making long-distance contacts at low power levels.
^
"Why QRP?". arrl.org. American Radio Relay League. Retrieved 10 December 2019.
amateur radio, QRPoperation refers to transmitting at reduced power while attempting to maximize one's effective range. QRPoperation is a specialized...
QRP may refer to: QRPoperation in amateur radio, low-power transmitting Queen retinue pheromone, a type of honey bee pheromones Queens Road Peckham railway...
2007-11-25. Maloney, Dan (8 March 2016). "How Low Can You Go? The World Of QRPOperation". hackaday.com. Hackaday. Retrieved 16 October 2019. Richard H. Arland...
refer to: Radio transmitters that send out relatively little power: QRPoperation, using "the minimum power necessary to carry out the desired communications"...
transmissions, as well as for low-power transmissions (commonly called "QRPoperation", from the Q-code for "reduce power"). There are several amateur clubs...
Considered the most popular DX band; usually most popular during daytime. QRP operators recognize 14.060 MHz as their primary calling frequency within...
may be required for these types of operation. Occasionally self-assigned operating suffixes such as /QRP for operation at low power are heard. Some repeaters...
or an answer. For example, the message "QRP?" means "Shall I decrease transmitter power?", and a reply of "QRP" means "Yes, decrease your transmitter power"...
published by AMSAT. AMSAT has not been actively involved in the launch and operation of most amateur satellites in the last two decades beyond allocating an...
at which members could congregate and learn about the technology and operation of radio equipment. One of the activities that schools and radio clubs...
CompM2 using the Wilcox Aimpoint CompM mount instead of the standard issue QRP mount Tactical Ordnance and Equipment Improved Combat Sling, which allows...
and so may vary slightly from other amateur licences. Maritime mobile operation is defined as operating a transmitter that is located on any vessel at...
music entrepreneur Chad Kassem in Salina, Kansas, United States in 2011. QRP sought to improve premier audiophile pressings, introducing innovations never...
Direction Finding, DX-peditions, hamfests, JOTA, QRPoperations, Contesting, DX communications, Light House operation, and Islands on Air. One of the most popular...
and weak/noisy signals due to marginal propagation paths, low power operation and inefficient antennas (e.g. in restricted and overcrowded urban locations)...
CS1 maint: numeric names: authors list (link) Arnold, Richard. "The First QRP* Ops". ARRL. American Radio Relay League, Inc. Archived from the original...
different languages. It is also popular with homebrewers and in particular with "QRP" or very-low-power enthusiasts, as CW-only transmitters are simpler to construct...
Global Information