Attenuators - Revision history

TimVK4YEH at 04:39, 28 July 2009

2009-07-28T04:39:07Z

← Older revision		Revision as of 21:39, 27 July 2009
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	=== The O circuit===		=== The O circuit===

			Also known as the O pad.

	==Online attenuator calculators==		==Online attenuator calculators==
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	* [http://www.daycounter.com/Calculators/PI-T-Pad-Attenuator-Calculator.phtml Pi and T pad calculator]		* [http://www.daycounter.com/Calculators/PI-T-Pad-Attenuator-Calculator.phtml Pi and T pad calculator]


	~~Also known as the O pad.~~

	== How is attenuation measured?==		== How is attenuation measured?==

TimVK4YEH: attenuator calculators

2009-07-28T04:36:24Z

attenuator calculators

← Older revision		Revision as of 21:36, 27 July 2009
Line 47:		Line 47:

	=== The O circuit===		=== The O circuit===

			==Online attenuator calculators==

			* [http://www.nu9n.com/tpad-calculator.html T and H pad calculators]from NU9N

			* [http://www.softpedia.com/progClean/Attenuator-Calculator-Clean-119756.html Attenuator calculator 1.2] Attenuator calculator software.

			* [http://chemandy.com/calculators/pi_attenuator_calculator.htm Pi calculator]

			* [http://www.daycounter.com/Calculators/PI-T-Pad-Attenuator-Calculator.phtml Pi and T pad calculator]


	Also known as the O pad.		Also known as the O pad.

TimVK4YEH: h, i o

2009-07-28T04:26:55Z

h, i o

← Older revision		Revision as of 21:26, 27 July 2009
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	[[Image:t_pad.jpg \| 300px]]		[[Image:t_pad.jpg \| 300px]]

			=== The H circuit ===

			Also known as the H pad or I circuit(I pad)

			=== The O circuit===

			Also known as the O pad.

	== How is attenuation measured?==		== How is attenuation measured?==

Carlb: /* How is attenuation measured? */

2009-04-09T01:23:26Z

How is attenuation measured?

← Older revision		Revision as of 18:23, 8 April 2009
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	\|----		\|----
	\|----\|}		\|----\|}


			{{electronics}}

TimVK4YEH: removed table code - added resistor tables as jpg's

2008-12-26T04:49:06Z

removed table code - added resistor tables as jpg's

← Older revision		Revision as of 21:49, 25 December 2008
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	* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.		* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.

	=Attenuator Circuits =		==Attenuator Circuits ==

	==The pi circuit==		===The pi circuit===

	In the circuit below, known as a pi pad;		In the circuit below, known as a pi pad;
Line 25:		Line 25:
	Approximate resistor values for a single pi pad are as follows		Approximate resistor values for a single pi pad are as follows

	~~{\| style = width~~:~~55 border ="1"~~		[[Image:Pi_pad.jpg \| 300px]]
	~~\|Attenuation dB \|\| Arm resistor \|\| Leg resistors~~
	~~\|----~~
	~~\|3dB \|\|17.6 \|\| 292.4~~
	~~\|----~~
	~~\|6dB \|\| 37~~.~~4 \|\| 150.5~~
	~~\|----~~
	~~\|10dB \|\| 71.2 \|\| 96.2~~
	~~\|----~~
	~~\|20dB \|\| 247.5 \|\| 61.1~~
	~~\|----~~
	~~\|----~~\|}

	== The T circuit ==
			=== The T circuit ===

	In the circuit below, known as a T pad;		In the circuit below, known as a T pad;
Line 50:		Line 40:
	Approximate resistor values for a single T pad are as follows		Approximate resistor values for a single T pad are as follows

	~~{\| style = width~~:~~55 border ="1"~~		[[Image:t_pad.jpg \| 300px]]
	~~\|Attenuation dB \|\| Arm resistors \|\| Leg resistor~~
	~~\|----~~
	~~\|3dB \|\| 8.5 \|\| 141.9~~
	~~\|----~~
	~~\|6dB \|\| 16.6 \|\| 66.9~~
	~~\|----~~
	~~\|10dB \|\| 26 \|\| 35~~.1
	~~\|----~~
	~~\|20dB \|\| 40.9 \|\| 10.1~~
	~~\|----~~
	~~\|----~~\|}

	= How is attenuation measured?=		== How is attenuation measured?==

	Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:		Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:

TimVK4YEH: /* The T circuit */

2008-12-22T06:15:01Z

The T circuit

← Older revision		Revision as of 23:15, 21 December 2008
Line 48:		Line 48:
	[[Image:T-pad.jpg \|250px]]		[[Image:T-pad.jpg \|250px]]

			Approximate resistor values for a single T pad are as follows

			{\| style = width:55 border ="1"
			\|Attenuation dB \|\| Arm resistors \|\| Leg resistor
			\|----
			\|3dB \|\| 8.5 \|\| 141.9
			\|----
			\|6dB \|\| 16.6 \|\| 66.9
			\|----
			\|10dB \|\| 26 \|\| 35.1
			\|----
			\|20dB \|\| 40.9 \|\| 10.1
			\|----
			\|----\|}

	= How is attenuation measured?=		= How is attenuation measured?=

TimVK4YEH at 06:14, 22 December 2008

2008-12-22T06:14:07Z

← Older revision		Revision as of 23:14, 21 December 2008
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	Related wiki pages; [[Apparatus]], [[Dummy Load]]		Related wiki pages; [[Apparatus]], [[Dummy Load]]

	== What is an attenuator?==		= What is an attenuator?=

	An attenuator is a resistive device that reduces the amplitude of a signal without adding distortion to it. The amplitude of a radio signal is the power, so an attenuator is used to reduce the power of a transmission.		An attenuator is a resistive device that reduces the amplitude of a signal without adding distortion to it. The amplitude of a radio signal is the power, so an attenuator is used to reduce the power of a transmission.

	==When would we use one?==		=When would we use one?=

	* When making transmission measurements using highly sensitive equipment. The attenuator reduces power to protect the measuring equipment.		* When making transmission measurements using highly sensitive equipment. The attenuator reduces power to protect the measuring equipment.
Line 11:		Line 11:
	* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.		* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.

	==Attenuator Circuits ==		=Attenuator Circuits =

	===The pi circuit===		==The pi circuit==

	In the circuit below, known as a pi pad;		In the circuit below, known as a pi pad;
Line 38:		Line 38:
	\|----\|}		\|----\|}

	=== The T circuit ===		== The T circuit ==

	In the circuit below, known as a T pad;		In the circuit below, known as a T pad;
Line 48:		Line 48:
	[[Image:T-pad.jpg \|250px]]		[[Image:T-pad.jpg \|250px]]

	~~Approximate resistor values for a single T pad are as follows~~

	~~{\| style = width:55 border ="1"~~
	~~\|Attenuation dB \|\| Arm resistors \|\| Leg resistor~~
	~~\|----~~
	~~\|3dB \|\| 8.5 \|\| 141.9~~
	~~\|----~~
	~~\|6dB \|\| 16.6 \|\| 66.9~~
	~~\|----~~
	~~\|10dB \|\| 26 \|\| 35.1~~
	~~\|----~~
	~~\|20dB \|\| 40.9 \|\| 10.1~~
	~~\|----~~
	~~\|----\|}~~


	== How is attenuation measured?==		= How is attenuation measured?=

	Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:		Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:

TimVK4YEH: page need repair, I can work out how to fix the positions of the tables :(

2008-12-22T05:18:22Z

page need repair, I can work out how to fix the positions of the tables :(

← Older revision		Revision as of 22:18, 21 December 2008
Line 4:		Line 4:

	An attenuator is a resistive device that reduces the amplitude of a signal without adding distortion to it. The amplitude of a radio signal is the power, so an attenuator is used to reduce the power of a transmission.		An attenuator is a resistive device that reduces the amplitude of a signal without adding distortion to it. The amplitude of a radio signal is the power, so an attenuator is used to reduce the power of a transmission.

			==When would we use one?==

			* When making transmission measurements using highly sensitive equipment. The attenuator reduces power to protect the measuring equipment.

			* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.

	==Attenuator Circuits ==		==Attenuator Circuits ==
Line 56:		Line 62:
	\|----		\|----
	\|----\|}		\|----\|}
	~~==When would we use one?==~~

	* When making transmission measurements using highly sensitive equipment. The attenuator reduces power to protect the measuring equipment.

	* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.

	== How is attenuation measured?==		== How is attenuation measured?==

TimVK4YEH: /* How is attenuation measured? */

2008-12-22T05:15:17Z

How is attenuation measured?

← Older revision		Revision as of 22:15, 21 December 2008
Line 64:		Line 64:
	== How is attenuation measured?==		== How is attenuation measured?==

	Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation/dB relationship is:		Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:

	{\| style = width:55 border ="1"		{\| style = width:55 border ="1"

TimVK4YEH: small changes - T-pad diagram need revising

2008-12-21T22:20:03Z

small changes - T-pad diagram need revising

← Older revision		Revision as of 15:20, 21 December 2008
Line 34:		Line 34:
	=== The T circuit ===		=== The T circuit ===

	[[Image:T-~~attenuator~~.~~png~~ \|250px]]		In the circuit below, known as a T pad;

			* RL = Leg resistor
			* <math>RA_1</math> = Arm resistor 1
			* <math>RA_2</math> = Arm resistor 2

			[[Image:T-pad.jpg \|250px]]

	Approximate resistor values for a single T pad are as follows		Approximate resistor values for a single T pad are as follows

← Older revision		Revision as of 21:49, 25 December 2008
Line 11:		Line 11:
	* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.		* To produce low power for [[QRP \| QRP]] transmissions. many modern HF rigs have a minimum power out of around 5 Watts. QRP operators usually use powers well below this.

	=Attenuator Circuits =		==Attenuator Circuits ==

	==The pi circuit==		===The pi circuit===

	In the circuit below, known as a pi pad;		In the circuit below, known as a pi pad;
Line 25:		Line 25:
	Approximate resistor values for a single pi pad are as follows		Approximate resistor values for a single pi pad are as follows

	~~{\| style = width~~:~~55 border ="1"~~		[[Image:Pi_pad.jpg \| 300px]]
	~~\|Attenuation dB \|\| Arm resistor \|\| Leg resistors~~
	~~\|----~~
	~~\|3dB \|\|17.6 \|\| 292.4~~
	~~\|----~~
	~~\|6dB \|\| 37~~.~~4 \|\| 150.5~~
	~~\|----~~
	~~\|10dB \|\| 71.2 \|\| 96.2~~
	~~\|----~~
	~~\|20dB \|\| 247.5 \|\| 61.1~~
	~~\|----~~
	~~\|----~~\|}

	== The T circuit ==
			=== The T circuit ===

	In the circuit below, known as a T pad;		In the circuit below, known as a T pad;
Line 50:		Line 40:
	Approximate resistor values for a single T pad are as follows		Approximate resistor values for a single T pad are as follows

	~~{\| style = width~~:~~55 border ="1"~~		[[Image:t_pad.jpg \| 300px]]
	~~\|Attenuation dB \|\| Arm resistors \|\| Leg resistor~~
	~~\|----~~
	~~\|3dB \|\| 8.5 \|\| 141.9~~
	~~\|----~~
	~~\|6dB \|\| 16.6 \|\| 66.9~~
	~~\|----~~
	~~\|10dB \|\| 26 \|\| 35~~.1
	~~\|----~~
	~~\|20dB \|\| 40.9 \|\| 10.1~~
	~~\|----~~
	~~\|----~~\|}

	= How is attenuation measured?=		== How is attenuation measured?==

	Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is:		Attenuation is measured in decibels (dB) of relative power. A guide to the attenuation-dB relationship is: