# ADU-11e

*about to be finalized May 2025*


The ADU-11e (Analog Digital Unit) is a HF logger with 8 channels and 131 kHz max. continuous sample rate on 6 channels, 64 kHz on 8 channels and with 1024 Hz lowest native sample rate. Online filtering with 8x, 32x. <br>
The system has a single mainboard with all channels integrated and soldered GPS (GPS, Galileo, Glonass, BeiDou).
The CPU is an ARM quad core 64bit.


```{figure} ../../media/adu-11e/ADU-11e.jpg
:width: 80%
:align: center
:alt: ADU-11e

ADU-11e
```

One of the design aims is to keep the system small and light weight for [airborne](#airborne) applications (250 g board and 250 g connectors). <br>
The channel configuration is 2xE and 6xH. <br>
3 H channels can be connected to a [SHFT-02e](#shft-02e) 
or [SHFT-03e](../shft-03e/shft-03e.md) and the other 3 H channels to a [FGS-04e](../fgs-04e/fgs-04e.md) type fluxgate (airborne) <br> 
GPS data will be written @0.1Hz for control. <br>
For *ground based recordings* you connect coils like [MFS-06e](#mfs-06e), [MFS-07e](#mfs-07e) or [MFS-12e](../mfs-12e/mfs-12e.md)  and an electric field. <br>
You can also connect a [SHFT-03e](../shft-03e/shft-03e.md) while recording with the default coils; for example acquiring dedicated AMT data with this specialized sensor <br>
For extended LF recordings with 6 magnetic fields, use the [ADU-12e](../adu-12e/adu-12e.md). *However* the combination of ADU-10e and ADU-11e is **more flexible** and has the same price. <br>
While doing LF measurement with the ADU-10e and using the 10e as remote reference station, you can use the ADU-11e for the HF/LF data. <br>

### Technical Data

| Tech. Data      | Specs. |
| ----------- | ----------- |
| Frequency range | 4096s  to 64 kHz |
| Number of channels | 8 |
| Native sample rates of A/D converter |131, 64 ... 1 kHz <br> 512 ... 32 Hz with integrated filter <br> (lower sampling rates by off-line digital filtering)  |
| A/D conversion | HF/LF: 24 Bit (data rate max. 131 ksamples/sec) |
| Input resistance | >10 MΩ E, >22 kΩ H |
| Nominal input voltage range  (@ gain 1) | E: +/- 2.5 V and H: +/-10 V |
| System computer | 24 bit low-power embedded controller with Linux operating system |
| Storage media | 64 GByte SD card[^storage11e] (4 TB on external USB disk with ext4), USB-pen-drive or other external USB mass storage device |
| Test facilities | Automatic on power up self-test of all important system functions including sensors and display of result on the instrument. Automatic creation of log-file |
| Input noise | E @gain1: 70 nV/√Hz; H @gain1: 300 nV/√Hz <br> E @gain64: 7 nV/√Hz; H @gain64: 30 nV/√Hz|
| Calibration | automatic calibration |
| Network connection | 100 MBit Ethernet with RJ45 connector, WiFi module |
| Synchronization | 72 channels GNSS synchronized clock, accuracy +/-30ns rms accuracy of 1pps signal, station position is also determined and stored (GPS, Galileo, Glonass, BeiDou ) |
| Standard connectors for 8 channel system | 1 x Network RJ45 100 MBit ruggedized socket(s) |
| | 3 x Magnetometer 10-pole <br> Socket ODU G32K0C-P10QJ00-0000 |
| | 4 x E-field input terminal 6-pole <br> Soket ODU G32K0C-P06QP00-0000 |
| | 1 x Multi-Purpose for fluxgate 12 pole <br> Socket ODU G32K0C-P12QF00-0000 |
| | 1 x GND terminal |
| | 2 x input 12 V battery, protected against reverse polarity <br> Socket ODU G32K0C-P02LTS0-0000 |
| | 1 x ext. satellite antenna SMA-Type socket |
| | 1 x ext. WiFi antenna SMA-Type socket |
| | 1 x USB2.0 Type A |
| Case | ruggedized, water-resistant  case |
| Weight | appr. 4.8 kg |
| External dimensions | WxHxD 33 cm x 12cm x 25 cm |
| Power Input | 9V … 15V DC |
| Power consumption | 4 W[^pwcns11e] |
| Operating temperature range | -30°C to + 60°C |

<br>

| Cable Plug      | Connector (plug) |
| ----------- | ----------- |
| E-field | S22K0C-P06MPH0-400S ODU MiniSnap Series K |
| H-field | S22K0C-P10MJG0-700S ODU MiniSnap Series K |
| Multi-Purpose | S12K0C-P12MFG0-7000  ODU MiniSnap Series K |
| Battery | S22K0C-P02MTS0-650S ODU MiniSnap Series K |

<br>

| ADU Socket      | Connector (socket)|
| ----------- | ----------- |
| E-field | G32K0C-P06QP00-0000 |
| H-field | G32K0C-P10QJ00-0000 |
| Multi-Purpose | G32K0C-P12QF00-0000|
| Battery | G32K0C-P02LTS0-0000 |

<br>

[^pwcns11e]: Power consumption may vary depending on the operation mode. With Ethernet and WiFi enabled, the power consumption is higher.

[^storage11e]: one month storage: @512 Hz 24.8 GB


* ~ 64 Hz yaw, pitch, roll sampling for [SHFT-02e](#shft-02e), [SHFT-03e](../shft-03e/shft-03e.md) and [FGS-04e](../fgs-04e/fgs-04e.md) in preparation for airborne applications
* simultaneous recording of AMT & MT with dedicated sensors
* continuous streaming of [atss](https://github.com/bfrmtx/MTHotel) data for remote logging

The systems writes standard *ats* files as well as streamed double data [atss](https://github.com/bfrmtx/MTHotel) 
(Matlab, Python/Julia NumPy array compatible with JSON data header)

You can use [syncthing](https://syncthing.net/), rsync and WebDAV to transfer data to your office.