Two Antenna Stack Match
Solves antenna matching problem with two phased antennas Provides convenient and flexible antenna switchingVacuum relays provide reliable high power operation
post 21 Dec 2021
Antenna Duplex duplexer Links →
Coupleurs Antennas for 2,4,6
The 1/4 wave of adaptation is calculated = Zo = root of Z1 x Z2 i.e. Zo = root of 50 x 100 = 70.7 ohm , D / d = 3.1 on the abacus formula corrected for the square section example: D = 20 mm and d = 6.5 mm
Coupleurs Antennas
The active part of the coupler is simply a small single-sided printed circuit fr4 1.5 mm thick, covered with a second copper-free 1.5 mm fr4 plate, so as to take the 50 ohm sandwich line
Cosa c'e' in un duplexer
Duplexer HF-VHF 1,6-150 MHz-UHF 410-480 MHz
Constructing a Six Meter Heliax Notch Filter
All of this started a couple of years ago when an unused Telewave 45 MHz duplexer was discovered at a repeater site. Maybe we could get it to work on six meters
Build a 2-Meter Duplexer
Who has already put a repeater on the air and ask him, What's the toughest technical problem you had with it? He will probably say that obtaining sufficient signal isolation
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The 1/4 wave of adaptation is calculated = Zo = root of Z1 x Z2 i.e. Zo = root of 50 x 100 = 70.7 ohm , D / d = 3.1 on the abacus formula corrected for the square section example: D = 20 mm and d = 6.5 mm
The active part of the coupler is simply a small single-sided printed circuit fr4 1.5 mm thick, covered with a second copper-free 1.5 mm fr4 plate, so as to take the 50 ohm sandwich line
Duplexer HF-VHF 1,6-150 MHz-UHF 410-480 MHz
All of this started a couple of years ago when an unused Telewave 45 MHz duplexer was discovered at a repeater site. Maybe we could get it to work on six meters
Who has already put a repeater on the air and ask him, What's the toughest technical problem you had with it? He will probably say that obtaining sufficient signal isolation