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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...

Conversion tables

For people who are not used to work in dB. Loss compared to input signal. VSWR compared to Return Loss (dB

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,...

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...

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...

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...

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...