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  • loopantennas@yahoogroups.com
    Amplifiers for Antennas and Pre-Selectors http://members.cts.com/king/j/jlkolb/site/ant.htm - presented by John Kolb [KK6IL] Four(4) Schmatic Diagrams are
    Message 1 of 102 , Jun 1, 2009
      Amplifiers for Antennas and Pre-Selectors
      - presented by John Kolb [KK6IL]

      Four(4) Schmatic Diagrams are provided:

      * The KRS AA-1 Active Antenna was sold through Radio West
      in the early '70's, and was a good performer.

      * In the '70's, this Circuit was developed suitable for
      use as an Antenna Pre-Amplifier or as the Amplifier for
      a Box Loop Antenna or Ferrite Rod Antenna.

      * A fancier version, with a Dual-Gate FET, featuring an
      RF Gain Control. Dual-Gate FET's can still be found,
      but not easily. This Schematic is closely related to
      a Pre-Selector sold as the KS Pre-Selector.

      * Better Nulling is obtained with a Loop Antenna when it
      is Center Tapped and Amplified with a Balanced Amplifier.

      Justice AM Antenna With Twin Coil Ferrite
      Justice AM Antenna With Twin Coil Ferrite by C. Crane Co.

      Directional Terminated MW/LW Loop by WellBroook (UK)
      K9AY is the Remote Controlled Variable Termination; Provides a Cardioid Reception Pattern with up to 30dB Gain Front-to-Back; Uses Two Delta Loops.

      Kiwa - High Performance MW Air-Core Loop Antenna
      High Performance MW Air-Core Loop Antenna by KIWA

      Palomar Engineers Loop Antennas LW-MW-SW2
      Palomar�s Loop Antenna gives superb performance on the AM medium-wave broadcast band. The loop rotates and tilts to give deep nulls so you can eliminate local interference. It also allows you to null out a station and listen to another one on the same frequency.

      The Quantum Stick Plus+ by DX-Tools Ferrite Rod Antenna Tuner Coupler

      Quantum QX Loop and other DX-Tools Products
      The Quantum QX Loop 7.5" Ferrite Rod Antenna Plus 40 dB FET Amp

      Terk AM loop at Amazon.com
      Here is a place you can buy yourself a TERK AM loop antenna, even some other stuff that is kind of off topic to talk about. 73

      WL1030 by maartenhagg
      Wideband Magnetic Loop 10kHz - 30MHz

      C Crane Company
      They sell the Justice AM Loop Antenna, Select A Tenna, Terk AM 1000

      Kiwa Electronics
      Kwia makes the best products for you and your radio equipment, and also improves things that needed improvement a long time ago.

      Stormwise Ferrite Rods
      Get some huge ferrite rods and a converter to go along with its, heck it even comes with project book.

      Universal Radio Company
      They sell all sorts of loops big and small for LW/MW/SW and VLF also 10 kHz to 15 MHz

      Find the best UK LF/MF antenna here.

      This is the site that sells the AOR loop

      Kiwa Electronics
      The maker of the air core loop antenna and other useful items that you may want on your wish list.

      LF Engineering Company
      A group of engineers, who make products for VLF/LF listening even ELF loops!

      Select A Tenna by Intensitronics Corp
      The maker of the select A tenna, a great AM loop antenna that is a little bigger than the terk

      Terk Technolegies
      The maker of the best sold AM and I use also called the AM-1000 AM loop antenna, there is also technical information on how it works.

      Torus Tuner Loop Company
      A very specially made loop that is almost as big as a hula hoop

      GRAHN (Germany) Specialized Loop Antennas for MW and SW Reception Contributed by radiohighfreq
      Grahn offers both Ferrite Rod Antennas and Shielded Loop Antennas. Translated from the Gremany Language Webpages here is the "Grahn Specialized Loop Antennas for MW and SW Reception" ULR Address: http://www.grahn-spezialantennen.de/
      Use the Google Translate a web Page Tool http://www.google.com/language_tools to convert these webpages to English.

      When considering AM Loop Antennas . . .
      - - - It all comes down to Time? & Money?

      How much Time? Are you going to be 'using' the Loop Antenna for
      DXing or simply for "Better" AM Radio Reception (Sports/Talk Radio

      How Much Money? Are you willing to spend for a Loop Antenna to get
      the kind of better reception you want.

      TBL: Time and Money translates to the AM Loop Antenna's Value to You.

      The average radio listener (97%), who wants better AM Radio
      Reception, can spend $100 or less and get an AM Loop Antenna that
      meets their needs.

      Here is a brief list of the more common AM Loop Antennas for $100 or

      * Justice AM Loop Antenna (Active)
      - - - http://www.ccrane.com/justice_antenna.asp

      * Torus Tuner 27" Loop Antenna (Passive)
      - - - http://www.torustuner.com/

      * Select-A-Tenna Model #541M (Passive)
      - - - http://www.selectatenna.com/

      * Terk AM Advantage Loop Antenna (Passive)
      - - - http://www.terk.com/pdfs/Advantage.pdf

      * RadioShack AM Loop Antanna # 15-1853 (Passive)
      - - - Discontinued (Find 'used' on eBay)

      * MTM Scientific AM Radio Loop Antenna (Passive)
      * http://www.mtmscientific.com/loop.html
      - - - Starter Kit, Deluxe Kit or Finished Antenna!

      * * * Home made 'Box' AM Loop Antennas
      - Usually 20" to 24" in size
      - - Generally a simple Passive antenna
      - - - Can be made Active with an add-on amplifier

      #1. * Justice AM Loop Antenna (Active)
      > - - - http://www.ccrane.com/justice_antenna.asp

      #2. * Torus Tuner 27" Loop Antenna (Passive)
      > - - - http://www.torustuner.com/

      #3. * Select-A-Tenna Model #541M (Passive)
      > - - - http://www.selectatenna.com/

      #4. * Terk AM Advantage Loop Antenna (Passive)
      > - - - http://www.terk.com/pdfs/Advantage.pdf

      #5. * RadioShack AM Loop Antanna # 15-1853 (Passive)
      > - - - Discontinued (Find 'used' on eBay)

      > * MTM Scientific AM Radio Loop Antenna (Passive)
      > * http://www.mtmscientific.com/loop.html
      > - - - Starter Kit, Deluxe Kit or Finished Antenna!
      > * * * Home made 'Box' AM Loop Antennas
      > - Usually 20" to 24" in size
      > - - Generally a simple Passive antenna
      > - - - Can be made Active with an add-on amplifier
      > NOTE: Beyond $100 in the $200 to $400 range are the

      #1.a. Kiwa MW Air Loop Antenna

      #1.b. Quantum Loop Antennas

      . . . #3. Palomar Loop Antenna

      Basic Wire Back Yard Loop Antennas
      Full-wave loops are very popular antennas. They are especially useful on 80 and 40 meters where they perform well at modest heights. These are closed loops that are one full wavelength long. Horizontal loops may be fed at any convenient spot. For best performance, make your horizontal loop into a square, especially if it is to be used on several bands.

      K9AY: How to Build the K9AY Loop Receiving Antenna
      AY Technologies Antennas by K9AY. Excellent Antenna for Medium Wave Frequency DXing.

      Plumbers's Loop Antenna {Broad-Band 'Single' Turn}
      A 'different' twist on the "Broad-Band " (4.8MHZ to 24.5MHZ) Loop Antenna using a Single Turn of Copper Tubing within a Plastic Hula Hoop and a Variable Capacitor *All-in-One-Unit* + Photos + Schematic + Loop Pre-Amplifier ~ Presented by Nicolae Santean

      Six Foot Square by Six Turn Loop Antenna
      New Mid-Size Loop Antenna by Graham Maynard with Matching Balanced Amplifier: Frequency Range 50KHz - 5000KHz.

      Ten Foot Receiveing Loop for Low-Frequency DXing
      A Page out of VE7SL's Note Book. This 10 Ft. Air-Core Receiving Loop was originally designed and constructed for NDB DXing and now is used for LOWFER DX work.

      Dave's HomeMade Loop Antennas
      This is the loop antenna my dad built in 1958. Although I was only 8 years old at the time, I knew what this was for and how it worked. WebSite/Pages produced by Dave Schmarder Page Contributed by radiohighfreq

      Kowalski AM/MW Loop Antenna
      The Kowalski Loop is similar to the Radio West Loop in that it is an amplified ferrite rod type loop. It only tunes the medium wave band. It was built and sold on a very limited basis by former National Radio Club member Paul Kowalski. Presented by Robert Kramer NV8V

      Radio West LW/MW Loop Antenna
      Radio West Loop Antenna was the commercially available Low (LW) and Medium AM/MW) Frequency Antenna available. It was a improvement over the Space Magnet Loop Antenna, which was the rage among medium wave DXers in the early-mid 70's. Presented by Robert Kramer NV8V

      VEA MW-1812 Loop Antenna Users Guide
      High Performance Tunable Loop Antenna VEA MW-1812VE

      18-inch Box Loop for MW
      Relatively easy-to-build MW loop that is small enough to fit on a desk, yet large enough to accommodate radios the size of a Sangean ATS-803A or smaller. For best nulling, place antenna/radio combination on a turntable/platter.

      4 Foot Box loop antenna
      Heres a 4 foot loop project by Bruce

      ATL-3 Loop Antenna by Graham Maynard (UK)
      Loop & Amp Project: ATL-3 Loop Windings are in the Shape of a Five 26" Sided Spiral

      Alt-Azimuth Wooden "HOOP LOOP" Antenna by Linus
      The Great Pumpkin" Speaks on "How To Make" a Loop Antenna from a Wooden Embroidery Hoop. Read the Exciting Saga of his journey in to the Kingdom of Hooppy-Looppy-Dom presented by RadioIntel.Com.

      DX zones results on loop antennas and projects
      Reference links on some loop antenna projects for you to build

      DXers Tool Box - DIY - Tuned Loop Antenna
      The DXers Tool Box "How To Build" a Tuned Loop Antenna = How can you vastly improve your Medium Wave reception? The antenna consists of an LC (tuning) circuit formed by the air-core loop and a tuning capacitor.

      Embrodary Loops
      While these loop are for crafts, they can be a craft of art for improved AM radio reception!

      Hard Core DXing
      Here's what nordic dx has to offer in their discription of loops in this website

      K5DKZ - Three Foot Box Loop Antenna Kit
      Complete Parts and Plans for a 3 Ft Box Loop Antenna "Kit" ~$85+SH

      KIT -by- MTM Scientific, Inc. -for- AM Radio DX Loop Antenna
      KIT =//= Designed to Build an AM/MW Radio DX Loop Antenna =//= Offered by MTM Scientific =//= Deluxe Loop Antenna Kit: Includes ALL the Hardware for Building this AM/MW Radio DX Loop Antenna.

      Long LoopStick Antenna for MW DXing
      Wound on a Three (3) Foot Length of PVC pipe, the "Long LoopStick Antenna" was an experiment to try to improve AM radio reception without using a long wire or ground.

      TL Loop Receiving Antenna 10 KHz - 30 MHz
      The principle of operation is that an rf voltage appears across the terminals of a loop when it is placed in an electromagnetic field. The voltage is proportional to frequency for a given field strength and so at Very Low Frequencies the voltage is very small and requires greater amplification but it is not quite as simple as that. The new TL Loop uses a unique feedback system to optimise the amplification/noise factor over a much wider range than has been possible hitherto.

      Very Low Frequency (VLF) Up-Converter
      STORMWISE: Palomar VLF Converter allows you to use your ordinary ShortWave Radio to listen below the AM Broadcast Band. Directly Tune VLF Stations of 10 KHz to 500 KHz using your existing ShortWave Radio. The VLF Converter easily connects between the Antenna and the Radio.

      W2BRI Xmit Loops Contributed by n3hkn
      Ham Radio xmitting loops. Detailed plans and reports from Hams experiences. Typical cost is $50 for pipe, capacitor, motor.

      WHY? Use a Shielded Loop Antenna?
      Read Message #384 and learn about the Shielded Loop Antenna's - Gain - Directivity - Apparent Gain due to Directivity - Noise - Noise Reduction - written by Brian Greer aka "progman22000" ~ (GreerTech.Com)

      "AM Loop Antenna Calculator" - by Bruce Carter
      Here is a Great Tool for those Loop Antenna => "What Ifs...."

      "Loop Antennas 101" Read This First
      Minnesota DX Club's Loop Antenna's web page that is a 'Must Read' =Says It All= A Starting Point Class 101- - - TOPICS: Principles of the Loop Antenna - What is a Loop and Why Use It - Construction Principles - What Can I Use a Loop For - Loops Another Look - Pictures of Home Built PVC loops - Loop Links

      * NEW => 2002 AM Loop Antenna Construction "Tips" by Bruce Carter
      Introduction / Why Another Loop Antenna Page? / Mathematics of Rectangular Loop Antennas / Construction Articles / Loop Antenna (and Related) Links

      Loop Antenna Modeling Software and more...
      Original, high-quality, radio engineering/modelling programs. Not freeware -- just free gifts -- please help yourself -- no catch. Download in a few seconds -- not zipped-up -- run immediately -- user friendly. Presented by R.J.Edwards (G4FGQ) Software

      Loop Antennas at Hard Core DX
      TABLE: Number of Turns -v- Size of Loop in the Middle of this webpage.

      Loops and Rods =&= The Ferrite Rod Antenna
      Theory / Formulas / Drawings = The use of a small Magnetic Loop as an antenna. The ferrite has the effect of intensifying the magnetic field inside the loop.

      Modify the common AM Radio Loop Antenna
      Hard-Core DX & Nordic DX = Topics: Install Larger Ferrite Rod - Fix External Antenna -Add a Long Wire - Or a Loop - Construct it - Connect it - Add an Amplifier. Presented by Bruce Carter

      Sensitivity of Multi Turn Receiving Loops
      LWCA - Multi turn wire loops are often used as low frequency receiving antennas. Basic electromagnetic theory is developed here as it relates to electrically small multi-turn loops at low frequencies. - Presented by William E. Payne, N4YWK

      Using the Small Loop Antenna by Joe Carr
      DXing.Com presents Joe Carr's Radio Tech Notes: Eight Page PDF Document provided by Universal-Radio.Com

      How to Get Better AM Radio Reception
      Features Loop Antennas and much more. The Antenna is 90% of Your Radio. Still Need More Signal? Try a Better Antenna.

      Introduction to Broadcast Band AM/BCB/MW DXing
      The International Radio Club of America (IRCA) WebPages

      ** Radio-Antenna-PRO ** H.Hertz-Forum
      Remember you may need some Russian Text software for this groupThe international forum for radioengineers, scientists and hams. All about radioelectronics, radiocommunications, radiophysics, electrodynamics. About 250 members from 20 countries. In Russian language. Very active. Lot of interesting researches and discussions.

      AM Radio Listening
      This is the group for the AM radio DXer, who wants to post logs and talk about loop antennas for AM only

      Longwave Radio Listening
      This group is dedicated to members that are into longwave radio listening and transmitting

      Magnetic Loop - German web site focuses on SW Loop Antennas. Contributed by radiohighfreq
      Posting are in German and English. Claims to be Non-Commercial and Pop-Up Add Free.

      Radio DX World
      This groups cares about you and your DXing, and also can help you with many resources of DX. Its by a radio group called the Global Communications Commission that devotes the hobby of radio DXing

      Radio DXing with The Interference Problem
      This is great for that annoying problem you have with your loop antenna, and you may think its the loop, think again it could be that messed up street light, next doors dimmer switch, and other something else you can't probably solve with just a loop antenna.

      Radio Science Observing
      Are you curious like Art Bell,and into radio phenomica, and propagation heres the place to come and join.

      "3805er" 80-Meter balanced coax loop
      Small shielded rx only loop for 80 meters

      Low Noise Coax-Shielded Faraday Loop Antennas for 80 - 40 Meters
      Four interesting and nice looking Shielded SW Loop Antenna webpages: * Low Noise Coax-Shielded Faraday Loop Antennas for 80 - 40 Meters * Coax-Shielded Faraday Loop Antennas Research Notes * Schematic of Coax-Shielded Faraday Loop Antennas - Website presented by "ProgMan22000" (GreerTech.Com)

      Magnetic Loop Antennas Receiving - by W8JI
      This WebPage's Topic Are: - Small Receiving Loops - Loop Antenna Fields - Dipole Antenna Fields - Radiation - Loop Shielding and Balance - by W8JI

      OctoLoop Antenna (Shielded)
      LWCA - The "OctoLoop" stands out in performance and ease of construction. Description and Drawing of the OctoLoop Antenna - Presented by William E. Payne, N4YWK

      Radiation and Fields (Magnetic Loop Antennas) - by W8JI
      This WebPage's Topic Are: - Electric Field - Magnetic Field - ElectroMagnetic Field - Near the Antenna - Losses - Near Field - Fresnel Zone - Farfield - Summary - by W8JI

      Shielded Loop Antenna WebPage presented by Doug "K8RFT"
      This personal webpage describes How To Make a Loop Antenna with Seven Feet of Six-Conductor Shielded Cable formed into a Circle and with the conductors connected in series to form a Six-Turn Loop Antenna. Original "Plans" from BeRadio.Com

      Shielded-Loop AM Antenna
      BeRadio.Com presents the "AM Loop Shielded Antenna for AM Reception:The loop self resonates approximately in the middle of the AM band, and by adding or subtracting turns it can be optimized higher or lower in the band.

      Shielded-Loop Receiving Antenna by N5FC
      Shielded-Loop antennas have some nice properties that make them desirable as portable receiving antennas.

      Justice AM Antenna a Review by RadioCorner.Com
      Developed by Chris Justice from the C. Crane Company, the Justice AM antenna is the best solution for pulling in a weak or, in some cases a station you never thought existed. The antenna uses a new patented technology called "Twin Coil Ferrite" that uses a regular ferrite rod antenna in a very unusual fashion.

      Antique Electronic Supply
      A sorts of older variable tuning capacitors for your loop antenna that needs one bad.

      Fair Radio Sales
      A wide variety of electronic components, radios, and variable capacitors for your loop antenna

      Ocean State Electronics
      Rhode Island's best selection for a wide variety of the best tuning capacitors for reasonable price, tell them that electronicdx (Adam Ebel) sent you.

      The Crystal Set Society
      Here are some capacitor available from a club that devotes to Crystal Set Radio

      The Surplus Sales of Nebraska
      This surplus store based in the state of Nebraska, has the one you might need, but they have minumim order policy

      Dan Small Parts and Kits
      Dan's wide selection from Canada.

      American Science and Surplus
      A big spool of wire here just about for AM

      For ribbon cable and other sorts of wire.

      Femco Magnet Wire
      Femco Magnet Wire is a joint venture company that has been supplying round insulated copper magnet (winding) wire to the transplant market since 1988.

      Welcome to Litz-Wire.com!

      MCM electronics
      They do sell wire and magnet wire here

      MWS Industries
      A place for all sorts of wire for business and industry

      Magnet Wire from Radio Shack
      This is what I use often

      Mouser Electronics
      Mouser has the biggest spools here for a great price, that makes sense

      Ocean State Electronics
      magnet wire at a good price

      WIRE "Flex-Weave" Antenna Wire
      "Flex-Weave" is a hybrid aerial wire that consists of 168 strands of woven #36 solid copper wires that provide high strength and extreme flexibility. The most popular version of "Flex-Weave" is the 'equivalent' of #14 AWG wire size. It can be 'used' for unsupported spans up to 200 ft (100-150 ft in areas with high ice and wind loading).

      WIRE "QuietFlex" Antenna Wire by Antennas & More: Insulated, Strong, Flexible and Durable
      "QuietFlex" Antenna Wire by Antennas & More: "QuietFlex" #14 AWG Wire has more than 41 Strands tightly twisted together under its Flexible Insulation making it both Strong, Flexible and Durable.

      Scanning, Ham Radio and Public Safety Resources
      - Links to the various webpages with resources for the Ham Radio Operator and Scanning Enthusiast. Resources such as; Monitoring Police and Fire Communications, What Antennas to use, Secret Scanner Frequencies, Radio Programming Software, Radio Mods and Operating Tips, Professional resources for Public Safety Management, Guidance and Self-Help.

      "SW-Radio Galaxy International"
      Free Radio From The Netherlands

      11 meter band
      rsn is a radio group on 11 meter for rad-oper world wide rsn truckers

      Stormwise - Supplier of large VLF ferrite rods.
      Amidon Ferrite rods, bars, plates, and tubes.

      Bytemark Ferrite rods, bars, plates, and tubes.
    • Steve Ratzlaff
      Interesting that MTM appears to have discontinued the MW loop that Paul mentions, though links to old ads for it are still at the bottom of the page, though
      Message 102 of 102 , Apr 1 8:27 PM

        Interesting that MTM appears to have discontinued the MW loop that Paul mentions, though links to old ads for it are still at the bottom of the page, though with "sorry, not available" all through the ads. Since it was an approx. 17 inch square loop, it certainly had a lot more capture area than the other commercial small tuned loops. And the review by radiojayallen is always worth reading.



        On 4/1/2017 7:05 PM, tenorman1952@... [loopantennas] wrote:

        I have a MTM Scientific kit built AM Loop, and there is a picture of my Loop on the
        customer's page at the MTM site.

        Recently I bought an older Grundig AN-200 AM loop.  This same antenna is sold
        as the Eton-Grundig AN-200, Kaito AN-200, and Tecsun AN-200.

        I also have one with the Tecsun label.

        (There is a similar look sold as the AN-100 by a number of companies, same loop,
        different base.)

        The AN-200, under whatever label, performs well.  Not quite as good as the much
        larger MTM Scientific, but very close.  With the price and no construction, it is a
        good buy.  And the black plastic base looks good stacked on top of black stereo

        And the price is certainly right... under $30 USD.

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