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80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savings THE KJ5VW 20 METER MINI YAGI The KJ5VW 20 Meter Mini Yagi The KJ5VW 20 Meter Mini Yagi Gary R. Hanson, KJ5VW Austin, Texas Imitation, it is said, is the sincerest form of flattery so let me begin by pointing to the direct source of my inspiration for building this antenna. ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manuals NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savings THE KJ5VW 20 METER MINI YAGI The KJ5VW 20 Meter Mini Yagi The KJ5VW 20 Meter Mini Yagi Gary R. Hanson, KJ5VW Austin, Texas Imitation, it is said, is the sincerest form of flattery so let me begin by pointing to the direct source of my inspiration for building this antenna. ALAN KEY) REPRINTED PERMISSION TAMING THE END-FED ANTENNA Alan Chester, GSCCB (Silent Key) Reprinted with permission from Radio Communication September 1994 TAMING THE END-FED ANTENNA T he single wire antenna directly connect- ed to the transmitter is often discour- aged in the amateur radio manualsMULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.SSTV CAM OF N4SPP
ABOUT THIS SSTV CAM. Created mid-2008. Standard frequency: 14230 kHz. Date + time (UTC) of reception is indicated in the lower left-hand corner of each image. Station locator: JN03qo. SSTV software: good old MMSSTV. Auto-slant is typically OFF. In other words: WYSIWYG ("whatyou send is
SPIRAL LOOP
This antenna is very compact: ≈ 120x120 cm (4x4 ft). It is basically a transformer loop antenna: it consists of a multi-turn tuned loop and a small feed loop. The tuned loop is spiral-wound and square, has about ¼ λ total wire length. It is terminated with a 25 pF variable capacitor. The small coupling-loop (feed loop) is triangular, with aFOLDED DIPOLES
As the name suggests, it is simply a dipole with the tips folded towards each other. In this case, a full-wave (1 λ) dipole. The span of a standard folded dipole is ≈ 0.5 λ.There are three basic variations, based on whether the tips of the folded dipole legs are interconnected, bridged with a terminating resistor, or leftunconnected:
ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savings20M MINI YAGI BEAM
In its simplest form, the Uda "beam" antenna is a 2-element antenna. It has a single radiating element that is "driven", i.e., is connected to a transmitter (or receiver, or transceiver), and a single passive element. The latter is not driven. Typically, the driven element isSLINKY-COIL DIPOLE
INTRODUCTION. A standard Slinky® is a toy made of a flexible 90-turn metal spring. It has diameter of 2¾ inch (≈7 cm). Slinkies have been popular since the 1940s and can still be bought today. Each Slinky contains about 67 feet (≈20.4 m) of flat steel wire (1/10 inch wide), and weighs approximately ½ 80M MID-LOADED DIPOLE 4. My 80 m short (vertical) dipole with center -loading is described on this page . IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). The minimum installation height of a horizontal dipole is often stated as about 0.05 λ. For the 80 mtr band, that is 4-5 m (13-16 ft).KGD MINI DIPOLES
Remove the enamel of the last 1 cm of these wire ends. This is easiest done with a heavy-duty soldering iron (not a soldering gun!). Once the soldering iron is hot, apply enough solder tin to the tip of the iron to obtain a large drop of molten solder. Hold THE KJ5VW 20 METER MINI YAGI The KJ5VW 20 Meter Mini Yagi The KJ5VW 20 Meter Mini Yagi Gary R. Hanson, KJ5VW Austin, Texas Imitation, it is said, is the sincerest form of flattery so let me begin by pointing to the direct source of my inspiration for building this antenna. NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8. 80M MID-LOADED DIPOLE 4. My 80 m short (vertical) dipole with center -loading is described on this page . IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). The minimum installation height of a horizontal dipole is often stated as about 0.05 λ. For the 80 mtr band, that is 4-5 m (13-16 ft).THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savings THE KJ5VW 20 METER MINI YAGI The KJ5VW 20 Meter Mini Yagi The KJ5VW 20 Meter Mini Yagi Gary R. Hanson, KJ5VW Austin, Texas Imitation, it is said, is the sincerest form of flattery so let me begin by pointing to the direct source of my inspiration for building this antenna. NONSTOP SYSTEMS: CONSULTING SERVICES FOR THE DEVELOPMENT CONSULTING SERVICES FOR THE DEVELOPMENT OF FAULT-TOLERANT SYSTEMS. System dependability modeling and analysis. System architecture evaluation and trade studies. Textbooks on reliable and dependable computing systems [old sample80-20M MAG LOOP
80-20m Mag Loop. This page provides a top-level description of Small Transmitting Loop (STL) antennas (a.k.a. "Magnetic Loop Antenna", MLA), and my two versions of such an antenna for 80 mtrs and up. My smaller 40-20 loop is described here. My helically wound "Slinky" loopis described here.
80M SHORT VERTICALS
Latest page update: 7 August 2019. INTRODUCTION. This page is a collection of short vertical antennas that I built over the years, for the 80 mtr band. With "short" I mean between 3 and 10% of λ. That is a lot shorter than a standard 1/4 λ vertical. Anything less than 75% of full-size is actually a real compromise.MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8. 80M MID-LOADED DIPOLE 4. My 80 m short (vertical) dipole with center -loading is described on this page . IMPORTANT Note that at my QTH, the installation height of dipoles is basically limited to 2 m (6 ft). The minimum installation height of a horizontal dipole is often stated as about 0.05 λ. For the 80 mtr band, that is 4-5 m (13-16 ft).THE FABULOUS DIPOLE
Steve Finch, AIØW June 2006 34 Two Band, Single Feed Dipole • Make a 40 meter dipole and feed with twin lead or balun and coax • Make a 20 meter dipole and attach at OPTIMIZING THE W3EDP ANTENNA Optimizing the W3EDP Antenna Published on September 29, 2013 in Amateur Radio and Radio Antennas. 2 Comments The W3EDP multi-band HFwire antenna is
W3EDP MULTI-BAND ANTENNA W3EDP Multi-band Antenna Published on September 22, 2013 in Amateur Radio and Radio Antennas. 4 Comments A description of the W3EDP antenna entitled An Unorthodox Antenna was published in the March ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savings THE KJ5VW 20 METER MINI YAGI The KJ5VW 20 Meter Mini Yagi The KJ5VW 20 Meter Mini Yagi Gary R. Hanson, KJ5VW Austin, Texas Imitation, it is said, is the sincerest form of flattery so let me begin by pointing to the direct source of my inspiration for building this antenna.MULTI-BAND END-FED
Figure 20: Nominal dimensions of the multi-band end-fed antenna. The antenna generally has a high impedance (several thousand ohm) on most bands. So an impedance transformation ratio of about 1:50 to 1:60 is needed to get down to 50 Ω. I.e., a turns ratio of about 1:7 to 1:8.SSTV CAM OF N4SPP
ABOUT THIS SSTV CAM. Created mid-2008. Standard frequency: 14230 kHz. Date + time (UTC) of reception is indicated in the lower left-hand corner of each image. Station locator: JN03qo. SSTV software: good old MMSSTV. Auto-slant is typically OFF. In other words: WYSIWYG ("whatyou send is
SPIRAL LOOP
This antenna is very compact: ≈ 120x120 cm (4x4 ft). It is basically a transformer loop antenna: it consists of a multi-turn tuned loop and a small feed loop. The tuned loop is spiral-wound and square, has about ¼ λ total wire length. It is terminated with a 25 pF variable capacitor. The small coupling-loop (feed loop) is triangular, with a ISOFLEX LDS 18 SPECIAL A Product information ISOFLEX® LDS 18 SPECIAL A Dynamically light, long-term lubricating grease ISOFLEX® LDS 18 SPECIAL A, Art.-No.: 004013, en Edition 02.08, replaces edition 07.00 MA-MP/SP Benefits for your application - Long service life due to good corrosion protection as well as ageing and oxidation stability, hence cost savingsSLINKY-COIL DIPOLE
INTRODUCTION. A standard Slinky® is a toy made of a flexible 90-turn metal spring. It has diameter of 2¾ inch (≈7 cm). Slinkies have been popular since the 1940s and can still be bought today. Each Slinky contains about 67 feet (≈20.4 m) of flat steel wire (1/10 inch wide), and weighs approximately ½ SLINKY-COIL HELICAL MAGNETIC LOOP ANTENNA A standard Slinky® is a toy made from a flexible 90-turn metal spring. It has diameter of 2¾ inch (≈7 cm). Slinkies have been popular since the 1940s and can still be bought today. Each Slinky contains about 67 feet (20 m) of flat steel wire (1/10 inch wide), and weighs approximately ½ pound (225 gram). Compressed, a Slinky coil isonly
20M MINI YAGI BEAM
In its simplest form, the Uda "beam" antenna is a 2-element antenna. It has a single radiating element that is "driven", i.e., is connected to a transmitter (or receiver, or transceiver), and a single passive element. The latter is not driven. Typically, the driven element isKGD MINI DIPOLES
Remove the enamel of the last 1 cm of these wire ends. This is easiest done with a heavy-duty soldering iron (not a soldering gun!). Once the soldering iron is hot, apply enough solder tin to the tip of the iron to obtain a large drop of molten solder. Hold HOW DESIGN GAMMA-MATCHING NETWORKS where XS HZ d Ra2 xaZ M= . ohms HZ (R,' + xa2) X il, = tan-' [ 'sRa + 2 degrees Ra I To match a lossless high-frequency trans- mission-line characteristic resistance, Ro, M cos $ = Ro ohms The lumped reactance, XI., added in series with Zi to tune out or cancel the reactive component of Zi can be determined from eliminates a separatecalculation for Zo.
THE UNDERESTIMATED MAGNETIC LOOP HF ANTENNA 1 An Overview of the Underestimated Magnetic Loop HF Antenna . It seems one of the best kept secrets in the amateur radio community ishow well a small
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