Antenna one to two STACK MATCH with BiP/BoP function by OK2ZAW

Stack Match is designed for the stack of antennas - do matching and power splitting to
two antennas. This Stack Match allows any of the four combinations for: upper - lower - Both In Phase(BIP) or Both Out Phase(BOP) antennas, vertically shaping the radiation lobes and changing the radiation take-off angle to optimize the signals depending on the varying ionospheric propagation angles.
Could be controlled independently for RX and TX - depends on controller.
Works with Mono-band antennas as well as Tri-band and Multi-band antennas! ( if wide band phase transformer is used )

Main functions:

• Two outputs to one input.
• Internal Wide Band or external Phase Shifter.
• Own (QRO.cz) ferrite cores for high power with great HF parameters.
• Two relays in series 2x16A in RF lines
• High quality 2mm PCB
• PTFE connectors PL-259 , UHF N or 7/16 DIN female with gold plated.
• High quality ATC RF capacitors
• Relay voltage 12V. Different on request.
• Power consumption < 6W.
• Aluminium shield enclosure.
• Aluminium mounting holder with bracket.
• Size 190 x 120 x 150 mm
• Weight 1.4 kg

Compare antennas:

There is comparison of the four combinations of a stack of two five element Yagi antennas. The possible combinations are as follows:

TOP antenna in 30m / 99ft - BLACK color.

BOTTOM antenna in 15m / 50ft - RED color.

BIP - Both IN Phase antennas in 15/30m - 50/90ft - BLUE color. Second picture: BLACK color.

BOP - Both OUT Phase antennas in 15/30m - 50/90ft - GREEN color. Second picture: RED color.

Top - Bottom - Both In Phase and Both Out of Phase

Both In Phase and Both Out of Phase

Parameters:

Four versions: ( MP / HP and internal / external PH shifter )
Power handling *	< 3,5 kW	< 6 kW
Frequency range **	1,8-30 MHz	1,8-30 MHz
Characteristic impedance	50 ohm	50 ohm
Relay version	5 , 12 or 24 V	5 , 12 or 24 V
PCB thickness	2 mm	2 mm
The measured values: ( stack match optimized for 10-20m bands )
VSWR IN to ANT1
VSWR IN to ANT2
VSWR IN to ANT1 + ANT2 BIP
VSWR IN to ANT1 + ANT2 BOP (internal WB PH shifter)

*) Normal CW, SSB, RTTY DX operation. In contest mode: CW, SSB 75% and RTTY 50% of HF power.

**) Usually optimized for some bands. For example for 10-15-20m or 160-80-40, but it could be designed for all bands with some compromis.

Matrix table

	Stack match Inputs
Selected	A1	A2	Bal	PH
A1	+	-	-	-
A2	-	+	-	-
BIP	+	+	+	-
BOP	+	+	+	+
+ 12 or 5V / - NC

Download

Stack match
Version 7	pcb	sch	eagle279
Open-Hardware
We believe open source is a better way of doing things. View and download the Shield Schematic and PCB Eagle CAD files. The hardware designs are released under the Creative Commons Attribution-ShareAlike 4.0 International License

Users implementation photos

Imre HA9AX

Imre HA9AX