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8x2 Element Array Antenna For 144 MHz
Front/back ratio was measured with a Drake R4c receiver with VHF converter listening to some strong and weak signals. I found substantially more than 25 dB
post 12 Sep 2024
Antenna for UHF VHF Links →
Stacking with Coax Cables as Transformation Lines
The stacking cables are made of odd multiples of 1/4-coax-cables 3/4-, 5/4- or 7/4
The HB9CV 144 Antennas
The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd
The normal-mode helix antenna
A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda When working in this mode the radiation is from the side of the helix, and when the diameter is considerably less than 0.1? the resultant 'spring' has a radiation pattern similar to a short vertical monopole or whip
Three Element Collinear J Pole
Working from the short end of the 5 sections of the J and looping counter clockwise through the top PVC Section, here are the measurements I used
149
The stacking cables are made of odd multiples of 1/4-coax-cables 3/4-, 5/4- or 7/4
The HB9CV is a well known two element antenna of a directional beam type with a forward gain of 4 to 5 dBd
A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda When working in this mode the radiation is from the side of the helix, and when the diameter is considerably less than 0.1? the resultant 'spring' has a radiation pattern similar to a short vertical monopole or whip
Working from the short end of the 5 sections of the J and looping counter clockwise through the top PVC Section, here are the measurements I used
Antenna splitter per VHF-UHF per quattro ricevitori Chi dispone di una sola antenna e vuole collegarvi più di un ricevitore necessità di uno splitter
Amateur radio kits by Kanga US
50MHz to 28MHz RX Converter The concept of the rx converter is quite simple and nothing really new. the local oscillator is a standard colpitts crystal oscillator producing the 22mhz lo signal