BIFILAR WIRE SOFTWARE
BIFILAR WIRE CODE
BIFILAR WIRE PASSWORD

BIFILAR WIRE SOFTWARE

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BIFILAR WIRE PASSWORD

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BIFILAR WIRE CODE

IT System Engineer, recently started having fun with morse code and Raspberry Pi Licensed Amateur Radio operator in 1996 as IW5EDI, active member of ARI Firenze and ARRLД¬lass 1970, married with two childrens, love experimenting and antenna home-brewing. Step-By-Step Construction of a 4:1 Current-Type Balun.Originally available at /~rjandusimports/index.html Related Posts via Taxonomies Windings for 75:300 ohm: 12 turns 1.25mm winding wire bifilar wound with twine between bifilar pair. Windings for 50:200 ohm: 12 turns 1.25mm winding wire bifilar wound, all close spaced turns. Test Results for 50:200 and 75:300 ohm 4:1 Toroid Balun Using FT-140-61 Windings for 75 ohm: 12 turns 1.25mm winding wire bifilar wound with twine between bifilar pair.ДЇor the 50:200 ohm balun the bifilar pairs are close spaced (winding method a).ДЇor the 75:300 ohm balun put spacing twine between the bifilar pair (winding method b). Windings for 50 ohm: 12 turns 1.25mm winding wire bifilar wound, all close spaced. Test Results for 50 and 75 ohm 1:1 Toroid Balun Using FT-140-61 If the lowest operating frequency is 3.5MHz then 10 turns is sufficient.ДЇor a 50 ohm balun the bifilar pairs are close spaced (winding method a).ДЇor a 75 ohm balun put spacing twine between the bifilar pair(winding method b). Spread the 12 bifilar turns of 1.25mm ecw evenly around the core. Windings for 50:200 and 75:300 ohm: 15 turns 1.0mm winding wire bifilar wound, with twine between all turns. Test Results for 50 and 75 ohm 4:1 Rod Balun Using R-61-037-300

Wind spacing twine between all turns as described above (winding method d). Wind 15 bifilar turns centred and close spaced on the rod. Use the same winding method and materials as in the rod balun above.Д¬ut two 750mm lengths of 1.0mm ecw for a bifilar winding. Spacing material: Kinnears 540 TEX colourfil twine product code K 069048 newsagents, craft suppliers. Windings for 75:75 ohm: 15 turns 1.25mm winding wire bifilar wound with twine between all turns. Windings for 50:50 ohm: 15 turns 1.25mm winding wire bifilar wound, with twine between bifilar turns. Measurements taken on Autek VA-1 analyzer вЂ“ with normal inaccuracies вЂ“ showing swr. Test Results for 50 and 75 ohm 1:1 Rod Balun Using R-61-037-300 Waterproof, terminate and house the finished balun as required. Start at the centre of the winding and work towards each end.ДЇor a 50 ohm balun put spacing twine between the bifilar turns (winding method c).ДЇor a 75 ohm balun put spacing twine between all wires (winding method d). 15 bifilar turns (2 wires) should now be centred on the rod, with sufficient end lengths for terminations.Д¬ut the spacing twine into 750mm lengths and insert between the wires as required by tightly pulling the cord between the turns. Starting at the centre of the rod, close wind half the length of the wires towards one end. Start by winding a layer of ptfe tape on the rodД¬ut two 750mm lengths of 1.25mm ecw for a bifilar winding. Toroid core with 10 close spaced bifilar turns

Note: This spacing material is polypropylene other material is probably suitable, but ensure it will not absorb moisture.Д®xamples of winding methods a, b, c, d on a rod.

Spacing material: Kinnears 540 TEX colourfil twine product code K 069048 newsagents, craft suppliers.

Wire: 1.0 or 1.25mm enamelled copper wire (ecw) as specified electronics shops.

Core insulation: 1 layer of ptfe tape (plumbers thread sealing tape) plumbing and hardware suppliers.

Ferrite Core: Select either rod or toroid core as detailed below.

The following designs which use toroid cores can be checked for safe operating conditions with the programs included in Programs. RF transformers should always operate within safe limits of temperature and linearity. These designs should be suitable for 100-200 Watt operation. The bifilar windings have been adjusted (spacing) to produce transmission lines with Zo of 50 or 75 ohms as required for best matching. The following diagrams and tables show some simple 1:1 and 4:1 baluns for use between 1.8 and 30 MHz using twin transmission lines made from enamelled copper wire (ecw).

Bifilar wire