WTF??

In article , B wrote:

I thought you were referring to DME navaids. Now I understand. I
presume DME navaids must have a limiting number of units they can
respond to too? Stan

I believe he was commenting about DME. I believe the high volumne
facilities can handle 200 aircraft at a time.

The usual means for DME transponders to limit the maximum number of replies
sent out is by reducing the receiver sensitivity so that weaker interrogations
are rejected. This does not necessarily mean that the more distant aircraft
are dropped since airborne interrogaters have different power levels. For
example, my KN-64 is 100 watts (iirc) while the TSO'd KN-62 is 200 watts.

Specifications for DME ground stations are usually expressed in terms of
maximum number of interrogations and replies.

--
Bob Noel
(goodness, please trim replies!!!)

"Paul Tomblin" wrote in message ...
In a previous article, said:
How does the system know which are the outer dme "targets"? Is it
just the weaker dme transmissions that are received by the ground
station that are dropped? Stan

By response time. It sends out a signal, and the first N to respond are
tracked.

--
No, Paul, the DME ground station does not initiate the exchange.
The ground stations only reply to interrogations from aircraft.
See Bob Noel's correct explanation elsewhere in this thread.
When the ground station is not being interrogated, it increases
its receiver sensitivity until it "replies" occasionally to random noise.
As more actual interrogations are received, the ground receiver
reduces its sensitivity to limit the rate of replies transmitted.

On Aug 19, 10:55 am, "John R. Copeland"
wrote:
"Paul Tomblin" wrote in ...
In a previous article, said:
How does the system know which are the outer dme "targets"? Is it
just the weaker dme transmissions that are received by the ground
station that are dropped? Stan

By response time. It sends out a signal, and the first N to respond are
tracked.

--

No, Paul, the DME ground station does not initiate the exchange.
The ground stations only reply to interrogations from aircraft.
See Bob Noel's correct explanation elsewhere in this thread.
When the ground station is not being interrogated, it increases
its receiver sensitivity until it "replies" occasionally to random noise.
As more actual interrogations are received, the ground receiver
reduces its sensitivity to limit the rate of replies transmitted.

Back when I was about 18 years old I had a guy on a construction crew
tell me that his radar detector worked by sending out a beam which
intercepted the beam of the cops radar and that is how it detected
it. When I tried to explain that it didn't work like that, but simply
received reflected signals which is why it could detect a cop over a
hill, he dismissed my explanation and stubbornly stuck to his
idea... :-)

wrote:
On Aug 19, 10:55 am, "John R. Copeland"
wrote:
"Paul Tomblin" wrote in ...
In a previous article, said:
How does the system know which are the outer dme "targets"? Is it
just the weaker dme transmissions that are received by the ground
station that are dropped? Stan
By response time. It sends out a signal, and the first N to respond are
tracked.
--
No, Paul, the DME ground station does not initiate the exchange.
The ground stations only reply to interrogations from aircraft.
See Bob Noel's correct explanation elsewhere in this thread.
When the ground station is not being interrogated, it increases
its receiver sensitivity until it "replies" occasionally to random noise.
As more actual interrogations are received, the ground receiver
reduces its sensitivity to limit the rate of replies transmitted.

Back when I was about 18 years old I had a guy on a construction crew
tell me that his radar detector worked by sending out a beam which
intercepted the beam of the cops radar and that is how it detected
it. When I tried to explain that it didn't work like that, but simply
received reflected signals which is why it could detect a cop over a
hill, he dismissed my explanation and stubbornly stuck to his
idea... :-)


Sigh...Some people are just stupid. You can't fix stupid!

-----Original Message-----
From: NoneYa ]
Posted At: Monday, August 20, 2007 10:06 AM
Posted To: rec.aviation.ifr
Conversation: WTF??
Subject: WTF??

....

Sigh...Some people are just stupid. You can't fix stupid!

I very much like my wall sign that reads "It's too bad stupid isn't
painful!" I had to bring it home - they wouldn't let me leave it
displayed at the office. I figure it was too much of a threat to middle
management.