New Transponder Comparison Table

Hi,

That is an interesting point. I wonder if Trig will update the manual with
changes to the maximum altitude when the first batch of units destined for
the US (after receiving US approvals) ships.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.

"jcarlyle" wrote in message
...
Don't know European rules, but the Trig TT21 installation manual says
in Table 3.1 that the altitude is 35,000 feet.

-John

On Sep 12, 8:08 am, cernauta wrote:
The factory brochurehttp://www.trig-avionics.com/library/tt21brochure.pdf
indicates that this Class 2 Transponder complies with the European
rules for "flying below 15.000 ft". Was it certified for flying up to
35.000 ft in the US? Lucky guys...

On Sep 12, 6:49*am, "Paul Remde" wrote:
Hi,

That is an interesting point. *I wonder if Trig will update the manual with
changes to the maximum altitude when the first batch of units destined for
the US (after receiving US approvals) ships.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.

"jcarlyle" wrote in message

...

Don't know European rules, but the Trig TT21 installation manual says
in Table 3.1 that the altitude is 35,000 feet.

-John

On Sep 12, 8:08 am, cernauta wrote:
The factory brochurehttp://www.trig-avionics.com/library/tt21brochure.pdf
indicates that this Class 2 Transponder complies with the European
rules for "flying below 15.000 ft". Was it certified for flying up to
35.000 ft in the US? Lucky guys...

Unless I am missing something the TT21 is a "Class 2 Level 2"
transponder. The Class 2 part that means it is technically limited to
15,000' and VFR. With 130W nominal (**at the connector**) these
transponders are clearly not intended to meet the 125W ERP (Effective
Radiated Power) requirement requirement for Class 1 (above 15,000'
use).

It is anybody's guess what the "Altitude 35,000'" in the spec tables
in the documentation is supposed to mean. It is an sloppily written
spec, either way is it "Maximum Altitude?" Maximum for what? It could
be the maximum operating altitude of the electronics, ignoring the
transponder is technically not certified for use above 15,000'. It
could be the maximum range of the altitude encoder. It is anybody's
guess what it means.

This certified altitude Class 1 vs. Class 2 issue has been discussed
here before, it is something that should not be driving decisions
IMNSHO. The important thing is to install and use a transponder in
areas of high traffic/mixed jet traffic (like around Reno) and the
Trigg TT21 looks an excellent choice.

Darryl

On Sep 12, 9:12*am, Darryl Ramm wrote:
On Sep 12, 6:49*am, "Paul Remde" wrote:



Hi,

That is an interesting point. *I wonder if Trig will update the manual with
changes to the maximum altitude when the first batch of units destined for
the US (after receiving US approvals) ships.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.

"jcarlyle" wrote in message

....

Don't know European rules, but the Trig TT21 installation manual says
in Table 3.1 that the altitude is 35,000 feet.

-John

On Sep 12, 8:08 am, cernauta wrote:
The factory brochurehttp://www.trig-avionics.com/library/tt21brochure.pdf
indicates that this Class 2 Transponder complies with the European
rules for "flying below 15.000 ft". Was it certified for flying up to
35.000 ft in the US? Lucky guys...

Unless I am missing something the TT21 is a "Class 2 Level 2"
transponder. The Class 2 part that means it is technically limited to
15,000' and VFR. With 130W nominal (**at the connector**) these
transponders are clearly not intended to meet the 125W ERP (Effective
Radiated Power) requirement requirement for Class 1 (above 15,000'
use).

It is anybody's guess what the "Altitude 35,000'" in the spec tables
in the documentation is supposed to mean. It is an sloppily written
spec, either way is it "Maximum Altitude?" Maximum for what? It could
be the maximum operating altitude of the electronics, ignoring the
transponder is technically not certified for use above 15,000'. It
could be the maximum range of the altitude encoder. It is anybody's
guess what it means.

This certified altitude Class 1 vs. Class 2 issue has been discussed
here before, it is *something that should not be driving decisions
IMNSHO. The important thing is to install and use a transponder in
areas of high traffic/mixed jet traffic (like around Reno) and the
Trigg TT21 looks an excellent choice.

Darryl

Oops I should have said 125 W peak power not ERP.

Darryl

As a very uneducated pilot,following Paul Remdes suggestions, I was
considering buying a Transponder mode S but then various people said local
airports didnt have mode S yet so it woulld be a waste of time for some
time to come..is this true?
If I buy mode S can it be accessed/ used by the current systems?
Some easy to understand stuff would be most welcome!
Regards from UK


At 16:36 12 September 2009, Darryl Ramm wrote:
On Sep 12, 9:12=A0am, Darryl Ramm wrote:
On Sep 12, 6:49=A0am, "Paul Remde" wrote:



Hi,

That is an interesting point. =A0I wonder if Trig will update the
manua=
l with
changes to the maximum altitude when the first batch of units
destined
=
for
the US (after receiving US approvals) ships.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.

"jcarlyle" wrote in message


..=
..

Don't know European rules, but the Trig TT21 installation manual
says
in Table 3.1 that the altitude is 35,000 feet.

-John

On Sep 12, 8:08 am, cernauta wrote:
The factory
brochurehttp://www.trig-avionics.com/library/tt21brochur=
e.pdf
indicates that this Class 2 Transponder complies with the
European
rules for "flying below 15.000 ft". Was it certified for flying
up
t=
o
35.000 ft in the US? Lucky guys...

Unless I am missing something the TT21 is a "Class 2 Level 2"
transponder. The Class 2 part that means it is technically limited to
15,000' and VFR. With 130W nominal (**at the connector**) these
transponders are clearly not intended to meet the 125W ERP (Effective
Radiated Power) requirement requirement for Class 1 (above 15,000'
use).

It is anybody's guess what the "Altitude 35,000'" in the spec
tables
in the documentation is supposed to mean. It is an sloppily written
spec, either way is it "Maximum Altitude?" Maximum for what? It
could
be the maximum operating altitude of the electronics, ignoring the
transponder is technically not certified for use above 15,000'. It
could be the maximum range of the altitude encoder. It is anybody's
guess what it means.

This certified altitude Class 1 vs. Class 2 issue has been discussed
here before, it is =A0something that should not be driving decisions
IMNSHO. The important thing is to install and use a transponder in
areas of high traffic/mixed jet traffic (like around Reno) and the
Trigg TT21 looks an excellent choice.

Darryl

Oops I should have said 125 W peak power not ERP.

Darryl

If you are thinking of buying a transponder, Paul, you should buy a mode S
transponder. You are correct that a lot of the ATC units you may contact
will not be Mode S equipped, but they will still recieve the mode A and
mode C (4 digit assigned code and altitude). Buying a non-mode S
transponder would be a waste of money, as you will need it to enter
certain areas and types of airspace in the UK. A transponder mandatory
zone means a mode S transponder mandatory zone.

At 19:15 12 September 2009, Andy Melville wrote:
As a very uneducated pilot,following Paul Remdes suggestions, I was
considering buying a Transponder mode S but then various people said
local
airports didnt have mode S yet so it woulld be a waste of time for some
time to come..is this true?
If I buy mode S can it be accessed/ used by the current systems?
Some easy to understand stuff would be most welcome!
Regards from UK

In message , Mark Dickson
writes
If you are thinking of buying a transponder, Paul, you should buy a mode S
transponder. You are correct that a lot of the ATC units you may contact
will not be Mode S equipped, but they will still recieve the mode A and
mode C (4 digit assigned code and altitude). Buying a non-mode S
transponder would be a waste of money, as you will need it to enter
certain areas and types of airspace in the UK. A transponder mandatory
zone means a mode S transponder mandatory zone.

Suspect (but am not sure) that all new transponder installations in the
UK must be mode S.



At 19:15 12 September 2009, Andy Melville wrote:
As a very uneducated pilot,following Paul Remdes suggestions, I was
considering buying a Transponder mode S but then various people said
local
airports didnt have mode S yet so it woulld be a waste of time for some
time to come..is this true?
If I buy mode S can it be accessed/ used by the current systems?
Some easy to understand stuff would be most welcome!
Regards from UK


--
Surfer!
Email to: ramwater at uk2 dot net

“ . . . in the UK. A transponder mandatory zone means a mode S
transponder mandatory zone. “

Wrong, at least for the new Stansted TMZ’s:

“ . . . access is permitted to any aircraft which is operating a fully
functioning pressure altitude reporting transponder in accordance with
the CAA’s TMZ Policy Statement or to those aircraft which the aircraft
commander has obtained permission from the air traffic control unit at
Stansted Airport, Farnborough Radar, or Essex Radar, as may be
appropriate, to enter the restricted airspace.”

So it needs Mode C, not necessarily Mode S, thought the latter also
incorporates mode C.

However, for new installations, I believe that Surfer is right – new
installations have to mode S.

If not so, no doubt somebody else will be along soon, To clarify.

Chris N.