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Combi dipole for 30 and 40m


After some experiments I could dip the trap around 10 MHz with a coax capacitor (17cm of RG214) of 17pF. So the coil at 10 MHz has an inductance of 14.7 µH at 10 MHz
post 23 Feb 2024
Combi dipole for 30 and 40m

Antenna Yagi Links

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Feeding and Matching
There are effectively two types of feed arrangements, balanced and unbalanced. Balanced feed line are readily available in various impedances (75/300/450 Ω), but the use of a balanced feedline presents some physical requirements that are not easy to get around

Gamma match per 21 Mhz
Come potete constatare con questo artifizio creiamo un condensatore in cui un'armatura e' rappresentata dalla superficie interna del tondino

Hairpin Match
I don't like this name, and would prefer to call it a "shunt match" because it is really just a simple coil shunted across the coax

L'antenne beam
The rotary beam is simply a yagi antenna used on decametrics. Although known from the end of the Second World War, it did not become popular in the European amateur world until the 1960

Le gain d'une antenne Yagi-Uda
The simplest yagi-uda antenna consists of two elements, a radiator and a director, a radiator and a reflector


Noise suppression with X-phase II

Noise suppression with X-phase II This device similar devices are known as QRM eliminators or noise killers, makes it possible

The K9AY loop antenna for 160 and 80m bands

The K9AY loop antenna for 160 and 80m bands You don't have the space to put up a 4 beverage antenna's, an ewe or a 4-square and want 'good ears' on 160 and 80m? no problems try a k9ay loop antenna

Microphone boom headset for the FT-897

Microphone boom headset for the FT-897 Boom length m. 5.24-fiberglass spreaders m. 2.95-loops dimensions m. 2.00 x 4.27 with 5.00 m