M/M combine

The Open M/M combine by RemoteQTH.com is the black box designed for IG9Y contest group. This box allows you to share the MAIN antenna systems (MAIN OUT connector) for RX and TX to MAIN and SUB TRX. There is also PTT interlock build in. It could be use for both SO2R or MO2R operations.

manual

Main features

RF RX:

RF TX:

PTT:

Technical parameters:

Isolation Main-Sub (RX):		typ. 40dB (160m) / typ. 22dB (10m)
Isolation Main-main, Sub-FA:		typ. 90dB (160m) / typ. 60dB (10m)
Isolation Main TX, SubRX FA:		typ. 100dB (160m) / typ. 85dB (10m)
Isolation Main ANT4, SubTX:		typ. 85dB (160m) / typ. 62dB (10m)
Insert loss TX:				max. 0.08dB
Insert loss RX:				max. 3.4dB resp. 7dB (Main TRX , ANT4 enabled)
DC power consumption:		        +12 - 14 V DC, 1A + stack match consumption

Stack match configuratin examples:

Please follow pictures at One to Three stack match for some typical situations.


Isolation between RX ports Main-Sub

Main RX ATT for Main out (ANT4 enable)

Isolation tu Sub RX, Main is TXing

Main TXing, Sub RX from FA input

ATT for Sub RX, sharing MAIN out

Download

PCB
Main board sch1 brd1 eagle725
sch2 brd2
Control box sch kicad665 Arduino code1029
Manual
.PDF1783
Open-Hardware
We believe open source is a better way of doing things.
View and download the Shield Schematic and PCB Kicad/Eagle CAD files,
LibreCAD .DXF, or Inkscape .SVG files.
The hardware designs are released under the
Creative Commons Attribution-ShareAlike 4.0 International License

Users implementation


IT9YVO

IT9YVO

Design & code ok1hra | Copyleft 2013-2017 | License