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Antenna switch 4-to-1 manual

This 4-to-1 antenna switch is ultimate QRO antenna switch for 4 antennas. Unused ports are connected to the ground. There are 4x 8A relay contacts for each port. Switch can handle more than 5kW for good SWR.



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Applications
Parameters
Schematic
PCB
KIT Assembling
Part list


Applications

- 4 antennas switch
- QRO PWR > 4 kW

- BPF switch

version with PL SO-239 connectors

4to1 switch pl so-239 connector qro.cz hamparts.shop



version with 7/16 connectors

4to1 switch 7/16 connector qro.cz hamparts.shop



classic version with N connectors

4to1 switch n connector qro.cz hamparts.shop



Example with BCD to DEC

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

BCD to DEC TTL version converter with 6 to 1 antenna switch by qro.cz hamparts.shop

Example with BCD to DEC TTL

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

BCD to DEC TTL version converter with 6 to 1 antenna switch by qro.cz hamparts.shop

Example with BCD to DEC TTL & microHAM devices

- need four (three) wires between controller and BCD to DEC converter
- GND, (+12V) and three control wires
- output must be with TBD driver (+ out)

BCD to DEC TTL version converter with 4 to 1 antenna switch by qro.cz hamparts.shop


Parameters

VSWR

measure 4-1 switch qro.cz hamparts.shop

Insert loss

measure 4-1 switch qro.cz hamparts.shop

Isolation 1to4

measure 4-1 switch qro.cz hamparts.shop

Isolation 1toOUT

measure 4-1 switch qro.cz hamparts.shop


Schematic

schematic 4-1 switch qro.cz hamparts.shop


PCB

pcb 4-1 switch qro.cz hamparts.shop



KIT Assembling

4-1 switch kit qro.cz hamparts.shop


pcb after assembling all the parts

4-1 switch assembled kit qro.cz hamparts.shop


Part list

NAMEPARTVALUE
RE3 - RE14 relay RT424012
C9 - C12 capacitor THT 10nF to 100nF 200V+
D7 - D10 diode THT 1N4007
VR1 - VR4 varistor 14V THT 10mm
R1 - R4 resistor 0.25W THT 1kOhm
LED1 - LED4 LED diode THT 3mm
X1 - X3 wago 3-pole wago



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