alan

alan

Pages: [prev] 1 2 3 4 5 6 7 [next]

• 40m loaded dipole - This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield.
  [ Hits: 194 | Votes: 4 | Rating: 8.75 ]

• Loaded Quarter Wave Antenna Inductance Calculator - Here is a formula and calculator for creating a loaded (shortened) quarter wave vertical or balanced dipole. The calculation refers to either a loaded 1/4 wave or a loaded dipole
  [ Hits: 163 | Votes: 0 | Rating: 0 ]

• Antenna Theory : Baluns - This article describe the principles of baluns when referred to devices used to balance unbalanced systems, like a coax cable and a dipole antenna
  [ Hits: 706 | Votes: 2 | Rating: 9 ]
• When and Where to Use Baluns - Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner.
  [ Hits: 1522 | Votes: 9 | Rating: 7 ]
• Unun vs Balun - Configurations and differences - If you ever asked if you need an Unun or a Balun this article is for you. The right question should be do I need a feed line choke or an impedance transformer whose output is configured as balanced or as unbalanced. An impedance transformer can be configured as a voltage transformer or as a current transformer.
  [ Hits: 345 | Votes: 3 | Rating: 6.67 ]
• 9:1 Unun Impedance Transformer - A 9:1 unbalanced to unbalanced (unun) impedance transformer based on a published design by Peter VK6YSF.
  [ Hits: 195 | Votes: 1 | Rating: 4 ]

• 160m Inverted Delta Loop - This 160 meter Delta Loop antenna is made of Hard drawn copper wire AWG 10, the two upper side are 148.5 foot each base wire is 240.9 foot, the feed point at 30.69 foot to one corner, feed with 450 Homs balanced line to an antenna tuner on the ground, then with 50 homs coax to the shack.
  [ Hits: 114 | Votes: 0 | Rating: 0 ]

• Chocking the End-Fed Antenna - Stop common-mode current when transmitting with an end-fed antenna. Unbalanced antennas are very prone to currents on the outside of the coax.
  [ Hits: 828 | Votes: 1 | Rating: 8 ]

• 2m Band Moxon - Moxon is a rectangle shaped directional antenna, originally designed by Les Moxon G6XN. There are couple of advantages of using this antenna. It is small in size, Easy to mast, Balanced to 50 Ohms, Near 1:1 SWR, Excellent Front to Back (F/B) ratio, Large bandwidth
  [ Hits: 583 | Votes: 1 | Rating: 6 ]

• Multi Band Slinky Doublet Antenna - An home made doblet antenna made with two Slinkys that are aproximately five meters in length connected with a twin-feed connected to a balanced ATU
  [ Hits: 463 | Votes: 1 | Rating: 10 ]

• Balanced Antenna Tuner - A Home made QRP tuner for 10-40 meters
  [ Hits: 1095 | Votes: 1 | Rating: 10 ]
• A Homebrew Z-Match Transmatch - A home made antenna tuner based on the W6JJZ basic concept that ,atches balanced loads without the use of lossy baluns, can provide band-pass filtering and harmonic attenuation.
  [ Hits: 1101 | Votes: 0 | Rating: 0 ]

• ZigZag Antenna - VHF/UHF unconventional antennas - An unconventional antenna family, the VHF/UHF Zigzag Dipole Antennas. Design, theory and practical construction, transformation and balancing with a half wave balun.
  [ Hits: 746 | Votes: 2 | Rating: 8.5 ]

• The UnTenna - Multiband random wire unun (unbalanced to unbalanced) for use with rigs with builtin autotuners.
  [ Hits: 237 | Votes: 0 | Rating: 0 ]

• VK9NT Norfolk Island 2022 - Chris VK3QB, Luke VK3HJ and Alan VK6CQ will be active from Norfolk Island - IOTA OC-005 14 April - 25 April 2022 (UTC)
  [ Hits: 66 | Votes: 1 | Rating: 10 ]

• The NZ HSMM Mesh - A web site dedicated to HamNet in New Zealand
  [ Hits: 262 | Votes: 1 | Rating: 10 ]

• Wellington Scanner Frequencies - New Zealand - Wellington Scanner Frequencies (NZ) Webpage with scanner frequencies for Wellington and the surrounding regions. Police frequencies are now digital in Wellington. Happy Scanning - WSF
  [ Hits: 264 | Votes: 1 | Rating: 1 ]

• Strictly Ham - Strictly Ham has a large retail presence in Australia and welcomes inquiries from New Zealand, the Pacific and Asia. Strictly Ham offers a comprehensive range of high quality Amateur, CB and Marine products, based in Victoria Australia
  [ Hits: 187 | Votes: 10 | Rating: 4.1 ]

• RF Solutions - RF Solutions is your authorised distributor of superior amateur radio products in Australia, New Zealand, and the Asia Pacific region
  [ Hits: 582 | Votes: 1 | Rating: 1 ]

• Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
  [ Hits: 404 | Votes: 1 | Rating: 10 ]

Pages: [prev] 1 2 3 4 5 6 7 [next]