RF Multiplexer 8ch 1GHz
Project Description
This is a PCB-design + Arduino firmware for an Ethernet-controlled 1:8
RF-multiplexer. 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 and may
fit in the OHWR “rackable 19” projects” category.
Two prototypes have been produced, with the second PCB-design
provisionally meeting the design goal for bandwidth/insertion-loss.
- http://www.anderswallin.net/2018/02/rf-multiplexer-first-try/
- http://www.anderswallin.net/2018/05/mux-in-a-box/
TEMPLATE TEXT BELOW - PLEASE MODIFY*
Main Features
Frequency-Distribution-Amplifier
- latest release "FDA 2017.03", board revision 3 on 2018-02-15.
- 2-sided PCB, 170 mm x 70 mm
- Input stage LMH6702
- Output stages LMH6609
- +6V and -6V low-noise DC rails provided by LT1963A and LT3015 low-noise regulators.
- ToDo: level detector? (logic-pin or LED to indicate presence of signal)
- ToDo: LED indicator for input signal
- ToDo: monitoring interface? (arduino or similar, Ethernet?)
- ToDo: multiple inputs?
Pulse-Distribution-Amplifier
- latest release "PDA 2017.04", board revision 3 on 2018-02-15
- 2-sided PCB, 170 mm x 70 mm
- +3V3 DC-rail from LT1963A
- Input to LT1711 comparator
- 1.0V trigger level, from LT1790 voltage reference
- fan-out and outputs from IDT5PB1108
- LTC6993 timer drives 200ms "BLINK" pulse to front panel LED
Enclosure
- Two boards fit side-by-side an a 1U high 19" rack enclosure.
- 16 mm connector-to connector, either SMA or BNC
- 150 mm deep enclosure (can be reduced, depending on powersupplies)
- two front panel indicator LEDs per board
- AC connector on back panel
Project information
- Frequency-Distribution-Amplifier
- Pulse-Distribution-Amplifier
- Enclosure
- Similar-Projects
- Anders Wallin's blog on Electronics
Contacts
Design and general questions
- Anders Wallin (anders.e.e.wallin "at" gmail.com)
Commerical producers
Status
Date | Event |
01-2015 | First ideas for making the distribution amplifiers |
18-12-2015 | First tests on Pulse distribution amplifier prototypes |
27-12-2015 | Frequency Distribution Amplifier, v2 simulations made |
30-01-2017 | Frequency Distribution Amplifier measurements made |
12-08-2017 | Project started on ohwr |
18-08-2017 | 5 prototypes built. S/N 005 tested |
29-08-2017 | Metsähovi connected to the official time of Finland with the distribution amplifier |
21-10-2017 | Design files published on ohwr.org |
03-01-2018 | Enclosure Design notes and CAD files published |
07-02-2018 | Draft datasheet |
15-02-2018 | Aivon LTD announced commercial availability of 1:8 PDA/FDA |