operation of antenna
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Antennas : 2M- Rectangular Loop antenna for 2 meter band
- An interesting and easy to build loop antenna for VHF bands, that present a feedpoint impedance of 50 ohms thus avoiding the need for a 1/4 wave impedance transformer. This antenna is ideal for sota and other portable operations
[ Hits: 275 | Votes: 1 | Rating: 1 ]
- Portable 70cm Quadruple Quad Beam
- A suitable high gain 70cms antenna for SOTA operation was sought that did not have the drawbacks of a long Yagi antenna, principally a narrow beamwidth and bandwidth.
[ Hits: 3545 | Votes: 3 | Rating: 8 ]
- End-Fed HalfWave Matching Unit for SOTA operations
- An end-fed half wave antenna matching unit made of 3:24 turns ratio on a FT140-43 toroid with a 150pF capacitor across the input.
[ Hits: 259 | Votes: 0 | Rating: 0 ]
- A loop antenna for 7 MHz to 30 MHz
- This note describes a relatively small, but efficient, loop antenna initially created for portable operation. With suitable modifications, it can be adapted for fixed station use. In this age of CC&Rs, an antenna similar to this may very well be the answer to your problems. Have a look, be inspired, get out the torch / soldering iron and create your own version!
[ Hits: 2447 | Votes: 8 | Rating: 7.25 ]
- Poles for portable operations
- Reviews of two types of poles used on portable operation to support wire antenna and accessories to plant poles in the ground by N4KGL
[ Hits: 619 | Votes: 0 | Rating: 0 ]
- Backyard Multi-Band Wire HF Antennas
- My Top Five Backyard Multi-Band Wire HF Antennas. A selection of the top 5 HF wire antennas for the backyard and for multi-band operation
[ Hits: 786 | Votes: 3 | Rating: 8 ]
- The Basics of Patch Antennas
- This article explores the basic concepts of patch antennas. Topics include principles of operation, impedance matching, radiation pattern, circular polarization, bandwidth, efficiency, alternative feed types, stacked patches and higher mode behavior.
[ Hits: 803 | Votes: 1 | Rating: 9 ]
- Asymmetrical Hatted Vertical Dipole
- Theory and origins of W4RNL Asymmetrical Hatted Vertical Dipole AHVD for portable operations.
[ Hits: 745 | Votes: 0 | Rating: 0 ]
- Overview on some SOTA portable antennas
- A review of some portable antennas for SOTA operations, including linked dipoles, end-fed, verticals
[ Hits: 684 | Votes: 1 | Rating: 4 ]
- Antennas for portable operations
- Article describing various type of portable antennas, from verticals, to dipoles, vertical dipoles, random wire with tuners, and end-fed antennas
[ Hits: 500 | Votes: 0 | Rating: 0 ]
- QRP Link Dipole Antenna
- Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. I wanted to make a simple dipole antenna for QRP portable operation that could be used on multiple bands.
[ Hits: 282 | Votes: 2 | Rating: 7.5 ]
- Half Sloper Multiband Antenna
- A presentation of a HF multi-band sloper antenna. This antenna project is for low band operations, and antenna presented in this article works on 40 80 and 160 meters band. Article is in Polish.
[ Hits: 786 | Votes: 5 | Rating: 7 ]
- Compact and effective 2m 70cm antenna
- Antenna was designed for SO-50 satellite operation but can be used for any VHF/UHF activity.
It's a mix of a Moxon Antenna and a Yagi antenna.
It has gains 4 dBd on 2m and 6.5 dBd on 70cm bands and it is fed via single 50 Ohm cable.
[ Hits: 2575 | Votes: 1 | Rating: 10 ]
- Long Wire Antenna for portable operations
- With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
[ Hits: 796 | Votes: 13 | Rating: 8.69 ]
- STAR-H Corporation
- STAR-H Corporation specializes in extremely wideband dipoles and compact low-profile antenna systems for military, emergency management, commercial operations and consumer wireless applications.
[ Hits: 397 | Votes: 2 | Rating: 10 ]
- Portable Amateur Radio Operations
- The main issues with portable HF operations have become not issues of the transmitting and receiving equipment itself but of providing power and antennas
[ Hits: 496 | Votes: 2 | Rating: 5.5 ]
- Radio N9SKN /P QRP Field Operations
- Personal web site by N9SKN about portable QRP operations with pictures of several portable setups and antenna solutions.
[ Hits: 145 | Votes: 0 | Rating: 0 ]
- Five Antennas Switch Box
- A project of a 5 Antennas Relay Switch Box, all Switches & Relays have both contacts wired in parallel to improve reliability of operation, to prevent static build up, when an antenna is not in use the feeder coax is grounded.
[ Hits: 1244 | Votes: 1 | Rating: 10 ]
- Portable RF Sniffer and Power Meter
- Whether we are tuning up homebrew equipment, checking antenna VSWR, adjusting a linear amplifier, or just monitoring output power during a contest, almost all aspects of ham operation can use a power meter. Paul Wade W1GHZ
[ Hits: 1784 | Votes: 1 | Rating: 10 ]
- miniVNA PRO Modifications
- The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation.
This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes.
However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
[ Hits: 136 | Votes: 5 | Rating: 7.8 ]
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