Do you ever use standby on your transponder?

George Patterson wrote:

I used to after first startup, but it's an unpleasant feeling to be flying
around near New York and realize that the xpndr has been on standby for the last
half hour.

Rumor has it that many a NY-based CFI would do just that to avoid getting
busted when their students crossed over into the NY class B airspace.

A pilot mentor of mine used to fly corporate into Teterboro in an MU-2 and
he told me he was always nervous on approach into TEB for fear of the GA
aircraft with the transponder turned off.

--
Peter


















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I have had landing aircraft report a near miss when I left my
transponder on accidentally..
At my little Class D airport our rule is standby to warm it up - it does
take a few minutes (at least mine does) - and on upon takeoff.

Tony
C-GICE

In article ,
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 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.




--

Tony Roberts
PP-ASEL
VFR OTT
Night
Cessna 172H C-GICE

Mine is on standby during taxiing and when I'm flying below Amsterdam
TMA1.
The moment I line up I switch it to Alt.

-Kees

Orval,

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 have never heard of that and find it implausible (unless possibly
taxiing on a bowl of concave sheet metal (PSP, anyone?)). Do you have
any examples of transponders actually damager by this?

--
Thomas Borchert (EDDH)

Newps wrote in news:gKydnTb27tVqe7TeRVn-
:


The change was made eons ago. There's no reason to turn the transponder
to STBY anymore.

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.

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?

--
Bob Noel
no one likes an educated mule

Judah wrote:

Newps wrote in news:gKydnTb27tVqe7TeRVn-
:


The change was made eons ago. There's no reason to turn the transponder
to STBY anymore.


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.

You heard wrong.

My avionics guy told me that the encoder (older ones, at least) have
a heater in them to stabilize altitude readings, and that the standby
function warms up the heater and the cavity tube in the transponder
that generates the return signal. The transponder won't go to work
until it's ready.
The transponder puts out a very brief 400-watt signal, at radar
freqencies, and I could see this being reflected off pavement and
entering the receiver directly (not through the antenna) except that
the box is aluminum and should constitute good shielding. I haven't
heard of any transponders being damaged this way, but then I've had
quite a few of them fixed over the years without knowing why they
failed. Maybe that signal damages navcoms instead.

Dan

Andrew Sarangan wrote:

In fact I would recommend to turn the transponder on before even getting
on the runway.

Same here. I'll run through the "lights, camera, action" checklist as I
start the taxi roll over the hold short line. I've never had to wait more
than a minute or so between a "position and hold" and "takeoff", so it's
never been a problem. The only "non-flying" thing I do when starting the
actual t/o roll is to start the timer, and I do that before the throttle.

I don't want my hand to be near the transponder or strobe switch when I
decide to abort a t/o.

- Andrew

Jay Honeck wrote:
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.

Standby gets used only:
a) At OSH, per the NOTAM.
and
b) When flying as a flight of two.

Otherwise, it may as well be soldered "on"...

That's what I'm saying!