R2T2 - multiuser SDR transceiver with WEB interface

The R2T2 is a complete SDR transceiver which by its construction to date
reflects the art and through his extensive peripherals and modular structure also
more likely to be in the future nothing to be desired.

The R2T2 is used inter alia as WebSDR of the German Amateur Radio Club.
Spread over 15 locations in Germany are located in the future each one R2T2
provide the per station full up to eight amateur radio receiver in the Internet.
In a later expansion, these devices can also act as transceiver for transmitting
be used as a transmission mode currently not only legal but
also operating and antenna Technical occur, need to be addressed.

Currently, the first batch of R2T2 in production.
As SDR server and SDR-GUI “QTRadio” is used.
The software version of R2T2 is also already progressed so far
that simultaneously all 8 DSP server available in real time over the network
transceiver run stable.

At a few “quirks” we still need to hone, (zt by QTRadio conditionally)
and specifically the access portal for the DARC-members has yet to be created.
This either from the operating Linux runs stable on the R2T2 and the periphery of R2T2
is fully supported, so that to selectively direct an HDMI monitor
can connect a USB keyboard and mouse.

Multiple Transceivers in action, up to 8 DSPServers in realtime

The circuit design of R2T2

Basic Considerations R2T2
block diagram of R2T2 functions
Power and Power Sequencing
HDMI video connector
audio DSP Interface
GPIO Digital and Analog InterfaceGPIO
Gigabit Ethernet and 2 x USB interface
TE0720 – the XILINX Zync module
master clock generation and synchronization
Dual RX (two receiver parts )
dual TX (two transmission parts
RF front – RF Multiplexers & Interfaces
MPPA 10W-PA Driver

Hardware & PCB of R2T2 V2.01

TOP Layer PCB
Inner Layer 1 PCB
Inner Layer 2 PCB
Inner Layer 3 PCB
Inner Layer 4 PCB
BOT Layer PCB
layout diagram PCB
PCB assembly

The firmware of R2T2

Total block picture of the firmware functions as a rough picture
unfolded overall block diagram of the firmware functions complete with function blocks
block diagram of the receiver structure
block diagram of a transmitter part (transmitter 1 of 8)
block diagram of a receiver part (receiver 1 of 8)

The software of R2T2: Linux

ArchLinux

Hurricane Watch Net Set to Activate on Saturday

August 31, 2019 in: News No comments

The Hurricane Watch Net (HWN) has been closely watching the progress of Hurricane Dorian and will activate on Saturday at 2100 UTC and remain in continuous operation on 14.325 MHz and 7.268 MHz. Over the past 24 hours, the hurricane’s fore... Read more