Trig Avionics ▪ TT21 Light Aircraft Transponder
Requirement
Trig Avionics, specialists in aircraft avionics, had a new opportunity to create the world’s smallest, lightest aircraft Mode S Transponder. Their innovative concept was to develop a split strategy for mounting in tight spaces in the form of a low profile user interface and a separate main transponder unit housing the key sensitive electronics. To help design & develop the rear transponder Trig Avionics turned to Shore Design.
Development
This split strategy sounded like it had solved all the issues; not so, it had to be as compact as possible and aggressive size and weight targets were set. The enclosure’s electromagnetic compatibility had to protect the sensitive core electronics from all other devices; typically the powerful communication signals inherent at all modern airfields. Additionally it had to be quick to install and remove.
Having taken on the full mechanical development, Shore’s solution centered on a magnesium alloy casting, supporting and shielding the internal components. An innovative “one click” mounting system capable of withstanding a heavy 20G crash was developed whilst taking into account the restrictive target weight.
Result
At only 62 x 45 x 141mm with a total system weight of only 450grams, the TT21 was launched into an eager market and sales have already exceeded Trig’s targets. By achieving the compact targets without compromise the TT21 offers gliders, antique aircraft and microlight’s an effective, compliant and above all safe transponder unit.
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