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nuckolls.bob(at)aeroelect
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 Posted: Wed Dec 20, 2023 4:48 am Post subject: Dummy loads (fyi) |
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| Quote: |
The PEAK power from a transponder is indeed
'high' . . . on the order of 150 to 200 watts.
But this is pulsed power lasting mere microseconds
per reply. |
Dummy loads are available for a huge
range of power. Some are fitted with
power meters. Here's one example.
http://tinyurl.com/253rwzaf
These devices will indicate power output
for the system under test. They're
rated for up to 40 watts full scale.
Attached to your VHF Comm transmitter,
they would read something on the order
of 5 to 10 watts AVERAGE POWER while
transmitting.
Attached to a REALLY excited transponder,
you would barely see the needle wiggle.
Another data point for testing a powered
up transponder. It doesn't put out any
signal until interrogated by a surveilling
ground station . . . this is what triggers
the 'reply' annunciator. So unless your
reply light is active, the dummy load has
nothing to do. The dummy load also prevents
the transponder from SEEING a ground
station. So even when testing in
vicinity of such facilities, the dummy
load prevents the transponder
from reacting to radar interrogation
pulses.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
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rv8iator
Joined: 11 Apr 2006
Posts: 144
Location: Newberg, OR
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| Posted: Wed Dec 20, 2023 6:39 am Post subject: Dummy loads (fyi) |
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Bob,Excellent info. I'm a bit smarter now, a good thing! As are others reading this!
.chris
On Wed, Dec 20, 2023 at 4:50 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | | Quote: |
The PEAK power from a transponder is indeed
'high' . . . on the order of 150 to 200 watts.
But this is pulsed power lasting mere microseconds
per reply. |
Dummy loads are available for a huge
range of power. Some are fitted with
power meters. Here's one example.
http://tinyurl.com/253rwzaf
These devices will indicate power output
for the system under test. They're
rated for up to 40 watts full scale.
Attached to your VHF Comm transmitter,
they would read something on the order
of 5 to 10 watts AVERAGE POWER while
transmitting.
Attached to a REALLY excited transponder,
you would barely see the needle wiggle.
Another data point for testing a powered
up transponder. It doesn't put out any
signal until interrogated by a surveilling
ground station . . . this is what triggers
the 'reply' annunciator. So unless your
reply light is active, the dummy load has
nothing to do. The dummy load also prevents
the transponder from SEEING a ground
station. So even when testing in
vicinity of such facilities, the dummy
load prevents the transponder
from reacting to radar interrogation
pulses.
Bob . . .
////
(o o)
===========o00o=(_)=o00o=========
< Go ahead, make my day . . . >
< show me where I'm wrong. >
=================================
In the interest of creative evolution
of the-best-we-know-how-to-do based
on physics and good practice.
|
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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_________________
C. Stone (RV8iator) |
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