Do you ever use standby on your transponder?

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.


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

I also set "Standby" if I am a wingman in a formation (Only Lead
squawks).

Orval Fairbairn wrote:
[snip]
I set to "Standby" on the ground, to prevent reflections that could
damage the unit.

A perhaps ignorant question: What reflects that could damage the unit
and how could it damage the unit?

John
Solo Student

Orval,

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


Say again? Or rather, explain that, please.

--
Thomas Borchert (EDDH)

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.

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


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

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

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)

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

"Orval Fairbairn" wrote in message
news

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


What reflections would do that and how?

Orval Fairbairn wrote:




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


??? Now there's a new one.