RF Multiplexer 8ch 1GHz
Project Description
This is a PCB-design + Arduino firmware for an Ethernet-controlled 1:8
RF-multiplexer (SP8T). It allows selecting as output one of eight
input-channels, as commonly used e.g. in timing-laboratories when one
wants to measure many RF-sources (clock outputs like 1PPS or 10MHz) with
a single instrument (frequency or time-interval counter). The design is
for two independent MUX-boards to fit in a 1U 19” rack enclosure
together with a microcontroller.
Two prototypes have been produced, with the second PCB-design
provisionally meeting the design goal for bandwidth/insertion-loss.
Main Features
- PDF design files 2018.02: Schematic and PCB
- SP8T: 8 inputs, 1 output. Nominally 50 Ohm characteristic impedance. BNC connectors.
- Bandwidth >1 GHz
- TE HF3 signal realy with lifetime of 1e7 operations (19 years at a rate of one operation per minute)
- older design: Arduino Duo + Ethernet Shield controller
- current design: Arduino MKR Zero + Ethernet Shield controller
- 10/100 Mbit/s Ethernet, simple control over HTTP
Components and datasheets
- TE HF3 Relay
- MCP23S17 16-Bit SPI I/O Expander with Serial Interface
- ULN2803A Darlington Transistor Array
Similar projects
- Open:
- TAPR TASS DC-150 MHz
- k5lxp 6x2 Coaxial Remote Antenna Switch
- Closed/Commercial:
- Pulse Research Labs PRL-8108 DC to 1.5 GHz SP8T multiplexer with 3-bit control.
- Mini-Circuits RC-2SP6T-A12 DC to 12 GHz 2SP6T multiplexer with USB and Ethernet control. SMA connectors.
Contacts
Design and general questions
- Anders Wallin (anders.e.e.wallin "at" gmail.com)
Commerical producers
Status
Date | Event |
---|---|
2018-02-15 | First PCB revision http://www.anderswallin.net/2018/02/rf-multiplexer-first-try/ |
2018-04-25 | Second PCB revision http://www.anderswallin.net/2018/04/rf-multiplexer-version-2/ |
2018-06-12 | OHWR-page rf-mux-8ch created |
2018-06-17 | initial commit of design to repository: mux-board, due2sata board, enclosure, mux-sw |
2018-08 | simplified design with no on-board voltage regulators and 10-pin IDC-cable for control. |
2018-11-24 | design update for kicad5 symbols and footprints |
2019-09-07 | Arduino MKR Zero carrier board files on wiki |