Hi Richard
The pitfalls depend on the existing configuration and your intentions. As
you know the Trig has a good built in intercom so no need to worry about
getting connection to an existing Intercom right. The biggest complication
I came across with an existing installation without an intercom is that many
PTT switches are simply wired in parallel. The TY91 has a priority circuit
so that if both crew try to transmit at the same time it gives P1 override
powers. This means the PTT switches have to be separately wired. Not a
problem electrically but often a pain because of the access to the stick
wiring. If you intend to keep your existing intercom the Trig wiring
diagrams helpfully explain the connection requirements for a small range of
intercoms. If yours is not on the list you are on your own but gives you
the general idea. Trig themselves are very helpful if you hit any
installation snags.
The TY91 has a separate control head so that you can mount the main unit in
a supplied tray anywhere that is convenient. This is OK with a new
installation but finding somewhere to mount it on a Europa is a bit of a
puzzle and can involve lots of wiring changes because of the physical
location of the main unit being very different to the standard fit on the
panel.
Mendelsons normally offer to make a loom for you but current demand
precludes that unless you are prepared to wait a long time. They will,
however, supply the wiring in lengths you want FOC.
Good luck!
Brian G-DDBD
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Richard Iddon
Sent: 10 April 2017 11:01
Subject: Europa-List: Trig TY91
I am just about to finally bite the bullet and order an 8.33 mhz radio. I
currently have a Microair 760 and favour the Trig TY91 as a direct
replacement. Has anyone made the transition from Microair to Trig TY91? If
so what are the pitfalls to beware of. From trawling the web I see that
Bournemouth Avionics seem to be offering the Trig at a good price. Anyone
used this company?
Richard Iddon.
G-RIXS
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