am antennas

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am antennas

507 links - and 5 categories

Antennas : 160M
  • 160M Folded Counterpoise - An FCP is not magic. It has no gain. An FCP improves an antenna system by replacing more loss with less loss. Some have been able to erect better wires in the air because the small size of the FCP allowed better placement of the antenna.
    [ Hits: 252 | Votes: 0 | Rating: 0 ]
  • 22 Antennas for the 160 Meter Band - 22 Different Wire Antennas for the 160 Meter Band, Random Length Radiator Wire, delta loop, loop antennas, off-centered antennas, sloper, dipoles, Z antenna, Zepp and Clothesline Antennas
    [ Hits: 764 | Votes: 1 | Rating: 1 ]
Antennas : Baluns
  • 50:450 Ohm (9:1) Balun for vertical antennas - A page describing how to home made a custom 9:1 balun for a common portable wire antenna. The author suggest to use 4C65 or FT140-61 toroids instead of the common Amidon T200-2
    [ Hits: 516 | Votes: 11 | Rating: 6.72 ]
Antennas : Dipole
  • Folded dipole antennas: terminated vs un-terminated - As the name suggests, it is simply a dipole with the tips folded towards each other. In this case, a full-wave dipole. The span of a standard folded dipole is aprox 0,5 lambda. In this article the author investigate on differences between un-terminated vs terminated folded dipole antennas.
    [ Hits: 493 | Votes: 9 | Rating: 6.78 ]
  • The half-wave dipole, your first antenna - Construction tips of a basic wire antenna, the half wave dipole. Inverted V dipoles and effects of inverted v on radiation pattern.
    [ Hits: 234 | Votes: 1 | Rating: 9 ]
Antennas : EH
  • DL7AHW Spraycan EH Antennas - Hairspray-can EH Antennas for shortwave and online programs. Small magnetic (H) antennas (Loops) have a good efficiency for the upper bands (20/15/10 meter band) and also in contrast to E-antenna a defined radiation direction.
    [ Hits: 310 | Votes: 2 | Rating: 8.5 ]
Antennas : End-Fed
  • Multi-band End-Fed Antenna - An excellent guide to homebrewing multi band end-fed antennas. The article, embed several drawings including diagrams and detailed pictures, illustrating the basic funcionality of end-fed antennas. The author gives some basic hints on how to build a half size antenna for 80 40 to 10 meters and a 6 meter to 40 meter configuration. It is also well described how to build the impedance transformer and the loading coils for lower bands.
    [ Hits: 1100 | Votes: 6 | Rating: 4.5 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
    [ Hits: 521 | Votes: 3 | Rating: 2 ]
  • End Fed Half-Wave Antennas - An interesting article on end fed half-wave wire antennas with a couple of original experiments. Author illustrate the role of the QRP matchbox, and a 40/20 meter antenna with a center stub making it a large bandwidth antenna for 40 and 20. Includes also an 80/40 end fed with the typical coil to make it available on 80 merts band.
    [ Hits: 287 | Votes: 2 | Rating: 10 ]
Antennas : Magnetic Loop
  • Homemade Magnetic loops antennas by F5RDS - Basic magnetic loop antenna examples and loop aerials theory explained. This article inclued some interesting tricks on building magnetic loop antennas and an usefull excell sheet to help compute magneti loop antennas calculating power efficiency from 10 to 40 meters band
    [ Hits: 256 | Votes: 0 | Rating: 0 ]
Antennas : Portable
  • 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 ]
Antennas : Towers
  • Antenna Mast Guying for Amateur Radio Antennas - Article based on ROHN engineering specification that will guide on proper guying heights and guy lengths when guying ham radio antenna masts. It will help you determine ahead of time the proper length of guy wires and the distance from the base of the mast to the anchor points
    [ Hits: 314 | Votes: 3 | Rating: 7.67 ]
Antennas : VHF UHF
  • Modifications to the Diamond V2000 and similar antennas - This kind of antenna has grown in popularity over the last years because it gives you a decent performance and triband capabilities. But its 50 MHz design is far from optimal. Here you can learn how to improve its 50 MHz performance in a very easy way.
    [ Hits: 627 | Votes: 2 | Rating: 9.5 ]
DX Resources : Shack Rental
  • DX HOLIDAY - DX-HOLIDAY is a DX holiday and DXpedition holiday-style dedicated website which provides excellent information on a range of pertinent topics such as: organize a DX-holiday in remote area, organize DXpedition holiday-style with your family, booking and negotiating with hotels, obtaining a foreign amateur radio license, rent a radio shack and antennas during your holiday, travel documentation & money matters, health, emergency, and weather issues
    [ Hits: 308 | Votes: 1 | Rating: 4 ]
Operating Aids : History
  • From Windom Antenna to Multiband OCFD - The Windom antenna, one of the oldest antennas developed for amateur use, has had a complicated history, one as interesting as the theory of the antenna itself.
    [ Hits: 305 | Votes: 2 | Rating: 5.5 ]
Shopping and Services : Regional : Europe
  • TelTad Online Shop - TelTad is a Polish amateur radio dealer with an online shop. Products offered includes all major ham radio brands, Yaesu Icom Kenwood, Alpin, OM Power, VPA systems Antennas
    [ Hits: 191 | Votes: 0 | Rating: 0 ]
Shopping and Services : Regional : Europe : Germany
  • UKW-Berichte Telecommunications - On-line shop for coax cables, RF connectors, Lightning protectors, Create antenna rotators, antenna masts and mounts, amateur antennas by FlexaYagi, Tonna F9FT, ANjo-Antennen and M2 Antennas based in Eggolsheim Germany
    [ Hits: 268 | Votes: 0 | Rating: 0 ]
  • Daki Funkversand - Daki Funkversand is a German based web shop for Amateur- & CB-Radio equipment. Our shop includes products such as radios, antennas, equipment, PMR, LPD & Freenet.
    [ Hits: 327 | Votes: 1 | Rating: 10 ]
Shopping and Services : Regional : USA
  • Signal Stuff - Amateur radio parts and accessories online shop, born to support hamstudy.org and examtools.org offer super elastic signa stic antennas, sma connectors and other small parts.
    [ Hits: 134 | Votes: 0 | Rating: 0 ]
Technical Reference : Vector Network Analyzer
  • 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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