Graybeard
Consult your local FAA office to determine ELT installation
applicability for your aircraft.
As for Portable ELT equipment, I can thouroughly recommend the 503
series as superior. My current employer has had no reliability problems
with them and they have a useful internal test function that won't
trigger a full rescue...
Here's a link to their website.
http://www.hr-smith.com/data/disptyp...andrescue.html
Regards
BAe146???