xtgaby
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, 2020
- 1 min
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, 2020
- 1 min
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, 2020
- 1 min
Building and measuring baluns (Part II). Another approach 1 core instead of 2.
Return loss measurement: Left: FT 240-43 Right: FT140-43 Insertion loss measurement: The...
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xtgaby
- Mar 15, 2020
- 1 min
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, 2020
- 1 min
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, 2020
- 2 min
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
- Oct 27, 2019
- 2 min
Engine rebuild Yamaha SR500
Empty left part of the engine. Start in a clean environment and be sure that all rests of old gaskets are removed. Place the bearings,...
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xtgaby
- Sep 9, 2019
- 1 min
How to spoke a wheel?
Step 1: Use te 9 spokes needed for the inner side. Step 2: Inner side ==> spokes inserted from above. Step 3: Place the inner spokes into...
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xtgaby
- Jan 11, 2019
- 1 min
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, 2019
- 1 min
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, 2019
- 1 min
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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