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Antennas : 12M
A dual band wire beam for 17 and 12 meters
- This wire beam Moxon antenna offers double duty on 17 and 12 meters with one 50 Ω feed line by Allen Baker, KG4JJH
Endfed 20/30 Mtr Antenna
- Article with detailed pictures of an endfeed antennna for 20 and 30 meter band
PY6CJ 80/40 meters dipole
- A center feed trapped dipole for 80 and 40 meter band in spanish
K7MEM Center-Fed Half-Wave Dipole ( 3-30 MHz)
- A Center-Fed Half-Wave Dipole is probably the simplest of antennas to construct and use. It is usually suspended between two supports, from it's end insulators, and has the feedline hanging from the center.
Feeding an End-Fed Antenna
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- End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.
Coaxial-feed axiam mode helical antenna
- Coaxial-feed axial mode hemispherical antenna is studied experimentally and theoretically
Helical Feed Antennas
- Helical antennas have long been popular in applications from VHF to
microwaves requiring circular polarization, since they have the unique
property of naturally providing circularly polarized radiation. Paul Wade W1GHZ
Antenna Impedance measurement
- When experimenting on an antenna it's often important to determine its feedpoint impedance at various frequencies across the operating band. It's easy enough to measure SWR, but sometimes we need to know more detail than this
Super J-Pole for 435MHz
- The Super J Pole antenna is a co-linear vertical consisting of a number of half wave length vertical elements separated with half-wave length stubs (Tuning stub) feed with a folded matching stub by vk6ysf
The DBJ-1 VHF-UHF Dual Band J-Pole
- Searching for an inexpensive, high performance dual band base antenna for VHF and UHF ? Build a simple antenna that uses a single feed line for less than $10.
Antennas and transmission lines
- A very exaustive article on antennas and transmission lines. Covers many aspects of antennas and feed lines, in spanish
Building the WiFi parabolic antenna
Priority listing
- Building a Bell ExpressVu satellite dish with a waveguide coffee can cantenna feed, and a Netgear USB Rangemax wifi card (WPN111).
Off-Center Feed - The Windom Antenna
- The Windom antenna was widely used in the 1930s and is named after the amateur that wrote a comprehensive article about it
Windom Antenna with 4:1 balun
- The Windom is an Off-center wire multiband Antenna. The old version was fed just by a single-wire connected on 1/3 of antenna's overall length or with an open-line feeder (later versions). Here is another model with coaxial feeder, which is compatible with Solid States - 50 Ohm output transceivers .
Monaro NSW / Canberra Live scanner
- VHF/UHF Scan from Monaro NSW and Canberra (ACT). Stream/Feed contains text-tags with frequency, which is displayed in your media-player as title/Meta-data. Recommended that you use Winamp.
Douglas: Live Douglas County Sheriff
- Douglas County Sheriff dispatch channel
Run your own live feed
- This tutorial will get you on the road to running your own live scanner feed on the Internet, be it railroad, fire/ems or law enforcement related.
RailroadRadio.net
- Live railroad scanner radio communications. Offer forums and links to several live railroad radio feeds
DXZone iGoogle Gadget
- Add The DXZone.com iGoogle gadget to your home page ot to the Google Desktop. You will be able to search the dxzone.com and load last new links feed in your home page.
HamInfoBar - Ham Radio & SWL Toolbar
Priority listing
- Free toolbar for radio hams & SWLs: Search QRZ.com, HamCall, FindU.com, Google, Wikipedia, eBay and other useful engines. Check the latest DX spots. Get links to QSL, satellite, forums, propagation, broadcast radio, maps etc. RSS feeds including Amsat & the latest eBay ham specials. Listen to ARRL, RSGB and WIA news & other radio stations. Plus lots of other features!
Online Calculators for Radio & Electronic Design
- Online calculators for toroid coil, air-core coil inductance, XL, XC, and more.
LA6PB's split dipole
- A new method of feeding a dipole with toroids.
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