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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

55



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

10 m| 12 m| 15 m|
17 m 20 m| 2 m|
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6 m| 70 cm| 80 m| 160 m| 136 khz
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