Netvouz / dc422 / folder / antennas

H5ANX Mk4 Delta Loop Design

dc422 — Wed, 18 Jul 2007 17:46:12 GMT

Hex Array -- telescoping vertical

dc422 — Thu, 13 Dec 2007 11:57:30 GMT

80/40 Meter Vertical

HF balun transformers

dc422 — Sun, 16 Dec 2007 13:33:30 GMT

HF_Balun Transformers_620.pdf (application/pdf Object)

High Power UNUNs ( Unbalanced to Unbalanced Transformers ) byCWS bytemark

dc422 — Sun, 16 Dec 2007 13:31:18 GMT

Unbalanced Transformers

Home-Built Antenna Hardware

dc422 — Mon, 31 Dec 2007 04:54:12 GMT

Horizontal Half-Wave Dipole Above a Counterpoise

dc422 — Wed, 15 Aug 2007 03:56:21 GMT

Horizontally polarized vertical antenna

dc422 — Tue, 07 Aug 2007 19:27:01 GMT

How to Bend Aluminum Tubes [Archive]

dc422 — Tue, 01 Jan 2008 17:03:13 GMT

Sculpture Community - Sculpture.net

How to Bend Tubing and Pipe by Hand

dc422 — Mon, 31 Dec 2007 04:43:55 GMT

Code, Metal and Cleverness: How to Bend Tubing and Pipe by Hand

How to Build an UNUN

dc422 — Sun, 16 Dec 2007 13:34:51 GMT

Monoband, and shortened antennas (less than 9 feet in length) can be difficult to match using just an LC circuit as described above. A switched UNUN (unbalanced to unbalanced transmission-line transformer) with multiple impedance taps may be the answer. Like the LC, they provide a DC ground, and the requisite impedance match albeit over a much greater range. The overall system losses are low (<3%), so the UNUN may be mounted near the radio rather than at the antenna. This can be an added benefit for users of remotely tuned antennas. Click to enlarge the schematic.