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Query: DARC
Links: 75 | Categories: 1
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The Deutscher Amateur Radio Club (DARC) invites radio amateurs world wide to participate in the annual WAE-DX-Contest. CW SSB and RTTY Contests -
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SSTV Fundamentals, frequencies in use for SSTV and many SSTV related infos, includes Fax basics -
Home page of the Dallas Amateur Radio Club, located in Dallas, Texas. The DARC is one of the oldest clubs in the country, founded in 1914. -
MDARC has a membership of over 300 dedicated hams and is one of the largest amateur radio clubs in California. -
Power supply from 3 to 30 V with an L200 IC by dl5dbm -
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Operating a ZS6BKW antenna often involves understanding its lineage from the _G5RV_ design, with specific modifications by ZS6BKW to optimize performance on several bands. Through computational analysis and field measurements, the antenna's dimensions were refined to allow operation on 10, 12, 17, 20, and 40 meters without an antenna tuner. For 80, 30, and 15 meters, a tuner is necessary, though efficiency on 30 and 15 meters is noted as not particularly high. The physical configuration consists of two 13.755-meter radiating elements fed by a 12.20-meter section of 450-ohm ladder line. Tuning the antenna on the 20-meter band is critical, and any deviation in the ladder line's characteristic impedance necessitates recalculating the element lengths. The design is also referenced in the 12th edition of _Rothammel's Antennenbuch_, page 219. Proper common mode current suppression is crucial at the transition from ladder line to coaxial cable. This can be achieved with a common mode choke, such as several turns of coax wound into a coil or over a ferrite toroid like an Amidon T130. While a 1:1 balun is an option, it may introduce issues. -
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Converting a ZETAGI B303 power amplifier for 50 MHz usage -
Article using a full wave delta loop antenna at low height, feeding methods, performance reports on 1984 QST article by W1FB and W1SE -
Building a high voltage (5KV), variable plate capacitor (17 to 220pF) -
A bazooka antenna design in German with dimensions for 20m and 40m band with RG174 coax cable stronger than the common RG58 -
6-Meter Solid-State 100W Linear Amplifier complete documentation German and English -
Kurzwellenbandplane der IARU Region 1 available in german and in english -
The Broward Amateur Radio Club was founded in 1946 and received their ARRL Charter of Affiliation March 2, 1949 and is now one of the largest clubs in the South Florida area today. -
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Construction of attenuator, suitable for fox hunts at 144mhz -
CAT5 T-568B Colour Code for RJ-45 Plug -
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A portable swiss quad antenna project made with components and parts that can be dismounted, in German -
Basic guide on soldering techniques, tips and tricks -
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Accessing this interface provides entry to one of the largest databases for amateur radio voice repeaters, encompassing over 8000 entries from more than 60 countries. The resource supports both desktop and mobile access, with a default display based on browser type, or forced via a "force" parameter (e.g., relais.dl3el.de?force=mobile). Users input a QTH-locator to find local repeater information. The database integrates FM-Funknetz servers and hotspots, potentially creating duplicate entries but ensuring new FM-Funknetz repeaters are immediately displayed. DMR repeater information, including status and talkgroup configurations, is sourced directly from DMR+ / ircDDB and Brandmeister systems, with real-time updates for active and default talkgroups. C4FM/Wires-X installations, particularly MMDVM-based gateways not listed in Yaesu's database, are identified through Brandmeister dashboard descriptions, marked with "W-x" or "W-x#MMDVM" for manual entries. D-Star repeater data from ircddb or QuadNet2 is also incorporated, with entries marked (i), (o), or (d) for manual additions. An APRS interface allows searching by callsign, using Sassan, DL3NCK's database, and offers a mobile-friendly, auto-refreshing display that follows an APRS station. Output data can be generated in GPX format for offline smartphone maps or CSV for spreadsheet applications. The database also attempts to determine valid repeater offsets based on IARU region and frequency, indicated by a "." after the frequency. -
The DARC DX Newsletter (aka DX-Mitteilungsblatt) is an important source of information for the active DXer. It is published on a weekly basis in German and English and keeps the readers up to date about current and planned DX activities. -
How to understand resistor colour codes -
San diego county amateur radio council, sandarc. serving the san diego amateur radio community. -
28.2575 MHz Beacon from Lake Constance water works Germany -
Serving the Big Bend area of west Texas -
The Delmarva Amateur Radio Club is located in Salisbury, Maryland -
There are a number of important technical issues relating to the matching of speakers to amplifiers, and to the wiring of multiple speaker systems -
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About capacitors, a complete guide to capacitors types and various characteristics -
Basic electronic circuit laws, capacitors, resistors, power circuits examples -
A basic article on audio cables, electrical wiring, cable lenght, data cables. -
German Amateur Radio Station DO8ER / DN7ML - DOK H05 Celle DARC / Wettersonden Hankensbüttel Germany (JO52HR) -
Crystal radio home made projects by DL2XM -
Employees and retirees of General Motors Corporation -
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Sound clips and notes on sporadic E on four meter band -
Deutscher Amateur Radio Club - Ortsverband Dusseldorf, R01 -
The branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared, or ultraviolet radiation -
Worked All Europe DX Contest Rules of the popular contest promoted by DARC -
One common semiconductor material, silicon, is far more widely used in electronics than germanium, partly because it can operate at much higher temperatures. Semiconductors are crystalline materials with electrical resistivity values between conductors and insulators, whose conductivity can be altered through _doping_ with impurities like arsenic or phosphorous to create N-type (excess electrons) or P-type (electron vacancies) materials. Semiconductor devices, such as diodes, transistors, and integrated circuits, leverage these properties to control electron flow in circuits. A diode, a two-terminal device with an anode and cathode, primarily permits current flow in one direction, making it useful as a rectifier to convert AC to DC. Specialized diodes include Zener diodes for voltage regulation and Light-Emitting Diodes (LEDs) that produce light when current passes through them. Logic circuits, fundamental to digital electronics, have binary inputs and outputs, performing functions like AND, OR, and NOT gates, and can be constructed from various binary devices including solid-state diodes and transistors. A transistor is an active semiconductor device with at least three terminals (base, emitter, collector), capable of amplifying current. Integrated circuits (ICs), often called chips, are electronic circuits built on a semiconductor substrate, typically silicon. ICs are classified by transistor type (bipolar or MOS) and integration scale: Small-Scale Integration (SSI) with fewer than 10 transistors, Medium-Scale Integration (10-100), Large-Scale Integration (LSI) with 100-1,000, and Very-Large-Scale Integration (VLSI) with more than **1,000** transistors. ICs can be analog, digital, or hybrid, offering virtually limitless functions.
