Do you ever use standby on your transponder?

In article , Maule Driver
wrote:

I don't.

You should.

From the AIM:

4-1-19. Transponder Operation
a. General
3. Civil and military transponders should be adjusted to the "on" or
normal operating position as late as practicable prior to takeoff and
to "off" or "standby" as soon as practicable after completing landing
roll, unless the change to "standby" has been accomplished previously
at the request of ATC.

--
Garner R. Miller
ATP/CFII/MEI
Clifton Park, NY =USA=

Yes, when flying in formation with others and I'm not lead. Lead
squawks, the others use standby.

On Thu, 15 Sep 2005 23:00:10 +0000, Jay Masino wrote:

Orval Fairbairn wrote:
Most TXP antennae are belly-mounted. They send out a rather strong EM
signal that can reflect off the pavement and overwhelm the receiver
portion of the TXP, possibly damaging it.

I would be surprised if most modern transponders don't protect against
this themselves by blanking the receiver during the transmit.

--- Jay

I would be surprised if the reflected power comes close to the power
received from radar...especially when near field with radar on field. Of
course, any additional information you can provide on this, I would be
most interested in reading!

Greg

Greg Copeland wrote:
I would be surprised if the reflected power comes close to the power
received from radar...especially when near field with radar on field.

That too.


--
__!__
Jay and Teresa Masino ___(_)___
http://www2.ari.net/jmasino ! ! !
http://www.OceanCityAirport.com
http://www.oc-Adolfos.com

Orval Fairbairn wrote:
In article ,
Thomas Borchert wrote:


Orval,


I set to "Standby" on the ground, to prevent reflections that could
damage the unit.


Say again? Or rather, explain that, please.


Most TXP antennae are belly-mounted. They send out a rather strong EM
signal that can reflect off the pavement and overwhelm the receiver
portion of the TXP, possibly damaging it.


1. The signal (about 200 W) is already on the feed line
even without a reflection.

2. The vertical antenna has a radiation minimum straight down.

3. The receiver is 60 MHz off the transmit frequency
(1030 and 1090 MHz).

4. The receiver is blanked and switched off the feedline
during the transmit pulses.

5. There is often an interlock line between the DME and
transponder to protect both receivers during pulse
transmit from either unit.

--

Tauno Voipio
tauno voipio (at) iki fi

Bob Noel wrote in
:

In article ,
Judah wrote:

I had heard that while it doesn't interfere with ATC radar services,
TCAS systems don't filter it out, and you could be causing
distractions for other planes on approach if you leave your
transponder on all the time.

what TCAS II system gives RA below 1000' agl?


I don't know. It was something I heard, not something I experienced.

Besides, if there is a TCAS II, perhaps there is also a TCAS I which isn't
as well protected as a TCAS II...

Newps wrote in
:

You heard wrong.

Funny, this aviation business.

It seems that about 50% of the stuff you hear from people who are supposed
to know more than you - instructors, experienced pilots, etc., etc. - is
urban legend, stated as if it were plain fact.

Sometimes it's hard to figure out what's real and what's bulls&^*
especially when the bulls^&* sounds so real...

(eg: if there is no valid use for a SBY mode, why is it there?)

Maule Driver wrote:
I don't. It stays on 24/7 (you know what I mean). 1200 unless given a
code. It effectively prevents "Maule, check your transponder" unless
using the wrong code.

Not a terrible idea. If the tower doesn't like it they can say so.

Personally, I turn it on at engine runup -- never on the runway. If I
forgot to turn it on, I don't think reaching over and switching it
would be a distraction. But then, I fly enough that I don't have to
look or even think about the transponder switch.

Some transponders have a 'ground' mode. The Garmin G-1000 turns its
transponder on and off automatically.

On Thu, 15 Sep 2005 17:15:14 GMT, Maule Driver
wrote:

I don't. It stays on 24/7 (you know what I mean). 1200 unless given a
code. It effectively prevents "Maule, check your transponder" unless
using the wrong code.

I was taught to use standby when on the ground and it says to do so
right in the manual.

Roger Halstead (K8RI & ARRL life member)
(N833R, S# CD-2 Worlds oldest Debonair)
www.rogerhalstead.com
I make no attempt to turn it off or go to standby while taxiing or
anything else. I've never been asked to go to standby or otherwise
questioned.

This has been discussed before but I'd suggest the everyone can do this
without causing a problem for anyone.

Judah wrote:

Newps wrote in
:


You heard wrong.


Funny, this aviation business.

It seems that about 50% of the stuff you hear from people who are supposed
to know more than you - instructors, experienced pilots, etc., etc. - is
urban legend, stated as if it were plain fact.



It used to be right, but times and technology change and those reasons
are no longer valid.