National Radio Day

20th August – National Radio Day

Individuals/communities can take National Radio Day as an opportunity to appreciate/celebrate what radio means to the world today. Some people might think radio has passed its prime.  Although it still acts as a strong force, especially for local communities.

The first person to identify radio waves was a German physicist Heinrich Hertz in 1886. But it took about three decades for a practical receiver to be invented, which was due to the work of Italian inventor, Guglielmo Marconi. Though it started with a Morse code message from just a kilometre away, Marconi paved the way for the future of the types of messages that radio waves could carry.

Radio waves
Types of messages that radio waves can carry

Cradle can be used to model radio systems, see the Cradle Physical Architecture Diagram (PAD) below which depicts an External Communications Sub-System:

Physical Architecture Diagram (PAD)
Physical Architecture Diagram (PAD)

If you are interested in Cradle’s modelling capabilities please send an email to

Move from ‘bdd’ to ‘ibd’

It is easy to traverse a SysML bdd (block definition diagram) to an ibd (internal block diagram). This is achieved via the cross references between the specification, holding the details, and its use on each diagram. A common piece of data represented in different ways on different diagrams. A case of record once, use many.

How to move from 'bdd' to 'ibd'
Follow cross reference from ‘bdd’ to ‘ibd’
Article updated 22/10/2018 – Added links to Cradle online help

Cradle-7.1 – SysML Videos

Our 3SL colleagues in the US have posted a series of videos demonstrating the SysML support in Cradle-7.1. This is a single demonstration, split into a series of parts:

You can access these demonstration videos here:

Please look at these videos and see how SysML models can be built in Cradle and how these models can be integrated into other information, including requirements, tests, test cases, defects, issues and risks.

At 3SL we believe that MBSE is the ideal approach (whichever notations you choose to use) but only if it is integrated into all of the other information in your project.

MBSE in isolation is just a bunch of pretty pictures!