4-way PTT combiner manual

4-way PTT combiner is a device for combining several (up to 4) inputs into one output. It is controlled by H/L logic, where inputs are activated by connecting to ground. Thus the output is also connected to ground. Otherwise the output has a high impedance.

This combiner can be used to combine PTTs from multiple TRXs into one output, for example for PA or some kind of blocking.

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4-way ptt sequencer by qro.cz hamparts.shop


4-way ptt combiner in box assembled qro.cz hamparts.shop

4-way ptt combiner assembled qro.cz hamparts.shop


- Optocoupler isolator protecting all ports
- Input PTT logic compatible with 5 V and more
- Input PTT logic active when grounded
- Input PTT logic current typ. 20 mA
- Output FET switch 50 V 500 mA
- DC power supply 9 V to 15 V typ. 65 mA
- PCB size 50x50.4 mm

Product details

Included in package

Combiner assembled and tested
DC plug (box version) - image
4pcs self adhesive feet pads (box version) - image

Box dimensions (mm) 58x50x24 mm - al box
PCB dimensions (mm) 50x50.4 mm
Weight brutto (kg) 0.12 kg


Ing. Jan Šustr
ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe

General instructions:

Please also read general instructions before handling the product.

European Union Declaration of Conformity

Manufacturer Ing. Jan Šustr (QRO.cz):

ID 05476356, VAT CZ8407024780
Palachova 1777/7, 591 01 Žďár nad Sázavou, Czech republic, Europe

declares that the assembled product:


is compatible with the relevant Union harmonisation legislation directives:
EMC Directive 2014/30/EU
ČSN EN 61000-6-3 ed. 2
ČSN EN 61000-6-1 ed. 2 (333432)

On behalf of Ing. Jan Šustr (QRO.cz)
Ing. Jan Šustr, CEO
5th October 2023

It's working like a charm!
Many thanks again for the quick development of the new product. It's working like a charm and I'm very happy with it. I tested it with 3 Transceiver: IC-705 / FT-DX10 and TS-890 simultaneously. Worked all flawless and without a issue like I expected it.
- Tamer, OE9TAV -
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65.34 € (tax incl.)
This is simply 4-way analog splitter. Designed for no-delay PTT switching. From one input to four outputs. You can split PTT signal to four independent devices.
65.34 € (tax incl.)
This is simply 4-way PTT sequencer, designed for PTT switching from one input to 4 outputs with different (fixed) delay.
65.34 € (tax incl.)
This is simple analog 4-way combiner. There is no delay between inputs and output. Each input has its own LED indication and so does the output.
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