## The use of a line output transformer core to make a balun.

Be careful when removing the core as it is very fragile! 10 windings were made both top and bottom. They behave like 100 ohm transmission...

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xtgaby

- Apr 21
- 1 min

Be careful when removing the core as it is very fragile! 10 windings were made both top and bottom. They behave like 100 ohm transmission...

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xtgaby

- Jan 13
- 1 min

Height and width of the loop are 1 meter. This means that one turn = 2.80 meters. In this case i have used tree turns = 8.40 meters. New...

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xtgaby

- Jan 10
- 1 min

Height and width of the loop are 1 meter. This means that one turn = 2.80 meters. In this case i have used two turns = 5.60 meters. I...

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xtgaby

- Aug 17, 2021
- 1 min

The feedpoint Square with a side = 5 meters Hard to see on the picture. top left is the feedpoint Used material: 1 core of 73 material...

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xtgaby

- May 2, 2021
- 1 min

Pictures: Schematic: U out = 2.5 x U in ==> Impedance Out = 2.5 x 2.5 = 6.25 x impedance In @ 50 Ohms in, Out = 312 Ohms. Measuring...

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xtgaby

- Apr 24, 2021
- 1 min

Picture: Schematic: Input: 3 transmission lines with an impedance of 150 ohms in parallel = 50 Ohms, Output: 3 transmission lines with an...

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xtgaby

- Mar 28, 2021
- 1 min

Used material: - 3 cores Amidon 240-43 - copper wire 1.8 mm diameter - PTFE tube with 2 mm internal diameter and 3 mm outside diameter -...

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xtgaby

- Mar 13, 2021
- 1 min

Used material: FT240-43 Schematic: Insertion loss: Return loss: Common mode rejection:

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xtgaby

- Mar 7, 2021
- 1 min

Guanella 2 wire Ruthroff 3 wire Schematic: Guanella 2 wire Ruthroff 3 wire Return loss: Guanella 2 wire Ruthroff 3 wire...

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xtgaby

- Mar 7, 2021
- 1 min

Used material: AmidonFT240-43 core. Top view Bottom view This is the way I think it should be made. Schematic: Insertion...

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xtgaby

- Mar 1, 2021
- 1 min

Used material: Amidon FT240-43 cores. LEFT = 2 conductors RIGHT = 4 conductors Left: transmission line with an impedance of 100 ohms....

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xtgaby

- Feb 6, 2021
- 1 min

For building descriptions, see my previous blogs. Return loss measurements: Insertion loss measurements: Insetion loss @ 14 MHz = 0.2 dB...

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xtgaby

- Jan 31, 2021
- 1 min

Insertion loss: Return loss: Common mode rejection:

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xtgaby

- Jan 30, 2021
- 1 min

On both sides, i placed 10 turns teflon wire. Insertion loss: Worst case = 0.09 dB @ 30 MHz. This means a power loss of 2 %. Return loss:...

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xtgaby

- Jan 16, 2021
- 1 min

The TS440 power amplifier is a push-pull amplifier with a very low output impedance. To make a conversion to 50 ohms, a 1/16 impedance...

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xtgaby

- Dec 30, 2020
- 1 min

Input / output impedance = 600 Ohms Measuring setup: Transformer impedance ratio = 600 / 50 = 12 I have ended with 3 turns / 10 turns....

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xtgaby

- Dec 26, 2020
- 1 min

Input / Output impedance = 2.000 Ohms Measuring setup: Transformer impedance ratio = 2.000 / 50 Ohms = 40 I started with 2 turns / 13...

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xtgaby

- Dec 1, 2020
- 2 min

How does it work? Depending on the selected frequency, one of the six available filters is activated. This is done by controlling a relay...

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xtgaby

- Nov 29, 2020
- 1 min

5,5 µH coil versus 55 µH coil. Picture: Schematic: 34 turns = 5.5 µH capacitor is approx. 320 pF. 104 turns = 55 µH capacitor is approx....

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xtgaby

- Nov 22, 2020
- 1 min

Important: only for receivers. This filter can not handle transmitted power. Picture: The Kank 3334 transformer from Toko has on one...

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