Redesign of DB0BUL in 2019: Unterschied zwischen den Versionen

Version vom 11. Januar 2019, 16:40 Uhr

1 Scope

DB0BUL will see a major redesign this year. It will sum up several changes and innovations that have come over the past year:

• My insight that there is a big difference between SD cards with SLC, MLC and TLC technology, and that cheap SD cards will destroy many hours of work.
• Receiving Es'HailSat
• The redesign of the connection between the DB0BUL and my parents' house, away from a Mikrotik RB433 to a standard 60GHz connection

2 Node History

2.1 Intel Atom

Historically, DB0BUL was an Intel Atom computer that still consumed a lot of power.

The layout of the first stage of the project is described here: The Echolink Node DB0BUL

2.2 Redesign as a 19" rack

The wish to save power and costs resulted in the creation of a 19" rack with a Seagate DockStar based computer. It was the first kind of freely avalable embedded computer for a reasonable price that could be operated ob a Linux basis.

• Seagate Freeagent Dockstar

And also the sound card / Transceiver interface made it into a 19" rack based component:

• Upgrade to my SvxLink Node

2.3 Upgrade to a Raspberry Pi

After about 10 years of seamless operation, the node failed for an unknown reason, so there was an upgrade to a RaspberryPi based solution.

Unfortunately it didn't work for a long time, because I used standard off the shelf SD cards, probably TLC kind of devices. I promise you, I will never do that again!!!!

2.4 Upgrade to Odroid XU4Q

The Upgrade to an Odroid XU4Q was motivated because of my Es'HailSat Experiment: I wanted to provide a reception possibility for EsHailSat and make it available over our HAMNET node.

• The device itself is powered passively, so no fan: https://www.hardkernel.com/shop/odroid-xu4q-special-price/
• The device has 8 cores, so plenty of computing power. Since it is a bigLITTLE architecture, it will consume not that much power but be able to scale well if requirements rise accordingly.
• Generally it consumes quite a lot of power: 4A at 5V. This power requirement will lead to the exchange of one of the power supplies in my rack. Though, this is not a problem because the link to the main building will be powered through the RB2011.
• I am using an eMMC card with 16 GB and Ubuntu 18 preinstalled.

I am using the pre-installed image as it comes, do some upgrades to the installed OS, but not invest that much time. The device will finaly have a fixed IP address inside of HAMNET:

https://hamnetdb.net/?q=44.225.41.35

and will be reachable as

http://db0bul.ampr.org

3 Images

To come