xtgaby
9:1 transformer for K9AY antenna.
Picture Schematics primary 2 turns secondary 6 turns Used material: 3 cores of 73 material Fair-Rite 2873000202 Input = 2 turns ...
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xtgaby
Sep 3, 20201 min read
Case study, how many turns are needed?
Picture Schematics Number of turns left = number of turns right. L value: XL value @ 1 MHz 1 turn: 0,02 mH 125 Ohms...
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xtgaby
Jul 29, 20201 min read
Transformers for receiving antennas.
Used material: 73 material Fair-Rite 2873000202 How to build and measure. 1) One core 2 turns left and 3 turns right. Input = 2 turns / ...
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xtgaby
Jun 1, 20202 min read
Building and measuring ununs
Remark: all return loss measurements (SWR) are with a light inductive load (adjustable resistor). Real results are always better then...
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xtgaby
May 31, 20201 min read
Magnetic loop 160 meter.
Calculated coil value of the loop is 6.4 uH as explained in de 40 meter band loop. Target frequency = 1.858 KHz Calculated capacity...
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xtgaby
May 30, 20201 min read
Magnetic loop 80 meter band.
Calculated coil value of the loop is 6.4 uH as explained in de 40 meter band loop. Target frequency = 3.700 KHz Calculated value for the...
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xtgaby
May 27, 20201 min read
Magnetic loop 40 meter band.
Alu tube 22 mm diameter lengt = 6 meter ==> diameter loop = 2 meter. Small loop to insert the signal =1.30 meter for best SWR figures. At...
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xtgaby
Mar 28, 20201 min read
Building and measuring baluns (Part II). Another approach 1 core instead of 2.
See remarks on post "Guanella balun 1 core versus 2 separated cores". Return loss measurement: Left: FT 240-43 ...
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xtgaby
Mar 15, 20201 min read
Conversion tables
For people who are not used to work in dB. Loss compared to input signal. VSWR compared to Return Loss (dB
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xtgaby
Feb 23, 20201 min read
How to measure the impedance of a transmission line?
If you have a transmission line (coax or open line) with an unknown impedance, I will explain here how to measure this. Above: far end of...
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xtgaby
Feb 9, 20202 min read
Building and measuring baluns (Part I).
The 1: 4 Guanella current Balun with FT240 - 31 core. Material used: FT240-31 (outer diameter is 2.4 inch material = 31) Just Google...
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xtgaby
Jan 11, 20191 min read
The use of stubs.
Every impedance can be matched with the use of two components. Capacitor or inductor. Dependent of the place you are on the smith...
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xtgaby
Jan 11, 20191 min read
A practical example.
I have made a vertical antenna with a lengt of 10 meters and two radials of 10 meters also connected to the ground. This antenna...
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xtgaby
Jan 9, 20191 min read
Antenne analysis and matching.
How to measure antenna impedance? Different types of VNA can be used. When using a professional VNA (Agilent, R/S,…) the measuring cable...
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