Arrl Antenna
Found 10 free book(s)
Build a Homebrew Radio Telescope - ARRL
www.arrl.organtenna response. Figure 7 — RT Interface circuit diagram. Detect the Earth’s rotation around the Sun and the Earth’s spin on its axis by compar-ing daily drift scans of the horizon. Antenna Subsystem The basic RT system is based on the “Itty-Bitty” design that is …
Antenna Here is a Dipole - ARRL
www.arrl.orgAntenna Here is a Dipole You've probably heard this phrase in many QSOs. Just what is a dipole antenna, and why are they so popular? By James W. ("Bus") Healy, NJ2L Assistant Technical Editor ipole antennas have been widely used since the early days of radio. Simplicity and effectiveness for a wide range of communications needs are
The G5RV Antenna System -- An Analysis
www.bvarc.orgARRL Wire Antenna Classics . G5RV (SK) June 2000 When the legend becomes fact, print the legend. Collins Multi-band Antenna •1935 Collins Radio had a “very” similar antenna
An Improved Multiband Trap Dipole Antenna - IW5EDI
www.iw5edi.comJuly QST: An Improved Multiband Trap Dipole Antenna - Page 1 ARRL 1996 QST/QEX/NCJ CD C i ht (C) 1997 b Th A i R di R l L I. Figure 2—Close-up of a completed trap. Figure 3—Double-coax trap schematic. The SWR performance of the antenna at my location, using a 50 to 75-Ω transformer and a 75-Ω feed line, is shown in Figure 4.
A Ten Meter Vertical Antenna for All License Classes
www.qsl.netwave or 5/8 wave two meter mobile antenna? It’s a cylinder about 2 to 3 inches tall and about an inch round. Within that gizmo is the 50 ohm to Hi Z matching device. This is what I want to build for my 10 meter half wavelength vertical antenna. I read about RF tuned circuits in the ARRL radio handbook. I found that parallel tuned
January, June, and September VHF Contest Rules
contests.arrl.orgreceiver and antenna) must exist for each QSO made under these conditions. 6.3 Non-rover (fixed) stations may not change locations. 7. Awards 7.1. Online certificates. will be available to all eligible participants. This includes: 7.1.1 Top Single Operator entrant in each ARRL/RAC Section for High and Low Power.
CW Abbreviations - CWops
cwops.orgARRL American Radio Relay League ABT About ADR Address AGN Again ANR Another ANT Antenna ARND Around AS Wait BCI Broadcast interference BCNU Be seeing you BK Break (to pause transmission of a message, say) BN All between BTR Better BTU Back to you BUG Semiautomatic mechanical key BURO Bureau ( "Please send QSL card via my local/national …
Antenna Height and Communications Effectiveness - ARRL
www.arrl.organgle, meaning that an antenna must be placed high above the ground in terms of the wavelength of the radio wave being transmitted. A beam type of antenna at a height of 70 feet or more will provide greatly superior performance over the same antenna at 35 feet, all other factors being equal. A height of 120 feet
ARRL Handbook - QSL.net
www.qsl.netANTENNA BASICS very ham needs at least one antenna, and most hams have built one. This chapter, by Chuck Hutchinson, K8CH, covers theory and construction of antennas for most radio amateurs. Here you’ll find simple verticals and dipoles, as well as quad and Yagi projects and other antennas that you can build and use.
80-10 end-fed half-wave antenna with 49:1 unun - Noji
noji.comAn 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground.