9 band

9 band

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• 40-10 Delta Loop Antenna - A multi band inverted delta loop antenna project that can be used from 40 to 10 meters band with full details and analysis of antenna performances on each band, document includes EZNec reports and setup pictures
  [ Hits: 16628 | Votes: 54 | Rating: 7.29 ]

• 9:1 Voltage Unun - A 9:1 voltage unun using a T-200-2 powdered iron toroid core to feed a long wire multiband antenna.
  [ Hits: 1493 | Votes: 12 | Rating: 6.91 ]
• 1:49 Transformer - This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it's a wideband transformer and it has some advantages compared to LC matching
  [ Hits: 2474 | Votes: 25 | Rating: 5.84 ]

• High Power 4:1 Balun - High power 4:1 air core balun for multi band fan dipole antenna
  [ Hits: 1610 | Votes: 4 | Rating: 2.75 ]

• End-Fed 6-40 M Multiband Antenna - This project produces an inexpensive, multiband, end fed HF antenna matchbox, quick and easy to setup. This project creates a trifilar wound, 9:1 UNUN toroid matching transformer. Handles 100W and need an antenna tuner.
  [ Hits: 1996 | Votes: 4 | Rating: 8.25 ]

• How to make a HB9CV - The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd. This one is for two metres but it can be scaled, from the dimensions in the diagram, for other bands I have also made them for four and six metres
  [ Hits: 1476 | Votes: 9 | Rating: 4.45 ]

• Tri-Band J-Pole - This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and a quarter stubs to achieve low angle radiation pattern. Designed with 4nec2 NEC based antenna modeler and optimizer for 145/220/440MHz bands
  [ Hits: 1922 | Votes: 5 | Rating: 9 ]

• OCF Dipole - ᥿9;This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. It is a dipole fed off center with a 4:1 current balun at the offset feedpoint. The antenna shown covers 80, 40, 20 and 10 meters with 15 meters and WARC bands
  [ Hits: 2560 | Votes: 7 | Rating: 9.43 ]

• 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: 805 | Votes: 1 | Rating: 9 ]

• Electrically Small Antennas 2016 - An antenna system is electrically small if it's enclosing sphere is <λ/2π. So a 10m band antenna of under 1.6m long qualifies.
  [ Hits: 424 | Votes: 0 | Rating: 0 ]

• Hustler 6BTV mod - 6BTV (or 5BTV or 4BTV) mod for 12 and 17 meter bands, how to make a 7BTV or 8BTV or 9BTV, easy and cheap
  [ Hits: 755 | Votes: 0 | Rating: 0 ]

• ZS6BKW Multi-band Antenna - The ZS6BKW antenna is derived from the G5RV by Brian Austin G0GSF who developed computer programs that were used in conjunction with Smith charts to calculate the optimum dimensions for his variant of the antenna.
  [ Hits: 976 | Votes: 0 | Rating: 0 ]

• PY0F AA4VK Fernando de Noronha - Three of the five-members from the 1992 Navassa DXpedition Team, AA4NC, Will; AA4VK, Ron; and WA4DAN, Murray are planning a reunion DXpedition to PY0F, Fernando de Noronha from October 18-27, including operating in the CQWW Phone Contest. An all-band operation is planned on 160 – 6 meters with SSB, CW & RTTY
  [ Hits: 117 | Votes: 0 | Rating: 0 ]

• GAP Titan DX - Tuning Bands - Picture taken from official manual with notes on tuning stubs for each band
  [ Hits: 910 | Votes: 2 | Rating: 7.5 ]

• iDX for iPhone - Free ham radio DX Cluster app for iPhone and iPad based on G7VJR DXlite, allow to easily filter by band, show skimmer or cluster spots, and call-sign search.
  [ Hits: 1241 | Votes: 39 | Rating: 9.35 ]

• PL-259 vs Type N Connector on 430 MHz - A test and comparison of real attenuation of N-type connectors and PL-259 connectors on UHF bands, domonstrating that connectors are almost equivalent.
  [ Hits: 710 | Votes: 2 | Rating: 7 ]

• Use Band Pass Filters to clean up Signals - Clean Up Your Signals with Band-Pass Filters, a two-parts article published in this PDF file from a June 1998 QST article
  [ Hits: 787 | Votes: 1 | Rating: 1 ]

• About Key Clicks - The Necessary Bandwidth for CW Signals By George Grammer W1DF
  [ Hits: 193 | Votes: 0 | Rating: 0 ]

• The VK3YE Micro 40 DSB Transceiver - A hombrew QRP transceiver for 40 meter band with many pictures, circuit and sound recording of some QSOs made with this Rig consisting of 5 transistor and one chip.
  [ Hits: 978 | Votes: 1 | Rating: 10 ]

• RF Sweep Generator - Hand made RF sweeper made to adjust the pass band of crystal filter
  [ Hits: 538 | Votes: 0 | Rating: 0 ]

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