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Cool It

I have owned an AT-AUTO since they were first released and its given good service. One area that it let me down was 10M
post 22 Sep 2020

Coils Traps Antennas Links


Low Cost Antenna Traps
Let's work through the design of a simple-to-construct low-cost antenna trap

La Trampa Balun
The choke balun has represented a more effective solution, from the electrical point of view, for monoband antennas

Multiband trap antenna
The design of the multi-band trap antenna in this article, that should cover the as many as possible of the classical HF radio-amateur bands

RF Inductance Calculator
Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any

Repairing Unadilla W2VS 40m Antenna Traps
The Unadilla trap is constructed with two concentric lengths of aluminum tubing separated by an insulating layer, thereby forming the parallel capacitor