Antenna tuner - Revision history

TimVK4YEH: /* The Tuner Fallacy */

2010-11-04T00:09:02Z

The Tuner Fallacy

← Older revision		Revision as of 17:09, 3 November 2010
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	Suppose that we set up a transceiver system like the one below.		Suppose that we set up a transceiver system like the one below.

	[[Image:Tuner_diagram.~~png~~]]		[[Image:Tuner_diagram.jpg]]

	Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.		Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.

	Now if the tuner is taken out of bypass mode and its [[inductors]] and [[capacitors]] adjusted until it produces a perfect match between transceiver and antenna, the SWR meter at left will be indicating 1:1, but the SWR meter at right will ''still be indicating 10:1''. In other words, our "antenna" tuner is actually tuning the transmitter to the antenna, not the antenna to the transmitter. We might better call it a transmitter tuner or transceiver tuner! There will always be feedline losses on the line between the tuner and the antenna. To minimise these keep this connection as short as possible and use the best cable you can afford!		Now if the tuner is taken out of bypass mode and its [[inductors]] and [[capacitors]] adjusted until it produces a perfect match between transceiver and antenna, the SWR meter at left will be indicating 1:1, but the SWR meter at right will ''still be indicating 10:1''. In other words, our "antenna" tuner is actually tuning the transmitter to the antenna, not the antenna to the transmitter. We might better call it a transmitter tuner or transceiver tuner! There will always be feedline losses on the line between the tuner and the antenna. To minimise these keep this connection as short as possible and use the best cable you can afford!

	== Tuner Models ==		== Tuner Models ==

TimVK4YEH: /* Tuner Models */

2010-11-03T23:46:15Z

Tuner Models

← Older revision		Revision as of 16:46, 3 November 2010
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	The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques. Simple schematic:		The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques. Simple schematic:

	[[Image:ATU.~~png~~]]		[[Image:ATU.jpg]]

	{{stub}}		{{stub}}

Carlb: Antenna Tuners moved to Antenna tuner

2009-06-05T23:06:50Z

Antenna Tuners moved to Antenna tuner

← Older revision	Revision as of 16:06, 5 June 2009
(No difference)

Carlb: /* Tuner Models */

2009-04-09T00:56:47Z

Tuner Models

← Older revision		Revision as of 17:56, 8 April 2009
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	{{stub}}		{{stub}}


			{{antennas}}

VK1WJ at 11:46, 8 April 2009

2009-04-08T11:46:47Z

← Older revision		Revision as of 04:46, 8 April 2009
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	Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.		Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.

	Now if the tuner is taken out of bypass mode and its [[inductors]] and [[capacitors]] adjusted until it produces a perfect match between transceiver and antenna, the SWR meter at left will be indicating 1:1, but the SWR meter at right will ''still be indicating 10:1''. In other words, our "antenna" tuner is actually tuning the transmitter to the antenna, not the antenna to the transmitter. We might better call it a transmitter tuner or transceiver tuner!		Now if the tuner is taken out of bypass mode and its [[inductors]] and [[capacitors]] adjusted until it produces a perfect match between transceiver and antenna, the SWR meter at left will be indicating 1:1, but the SWR meter at right will ''still be indicating 10:1''. In other words, our "antenna" tuner is actually tuning the transmitter to the antenna, not the antenna to the transmitter. We might better call it a transmitter tuner or transceiver tuner! There will always be feedline losses on the line between the tuner and the antenna. To minimise these keep this connection as short as possible and use the best cable you can afford!

	== Tuner Models ==		== Tuner Models ==

	The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques.		The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques. Simple schematic:

			[[Image:ATU.png]]

	{{stub}}		{{stub}}

G7VRD: Antenna -> Antennas

2008-07-12T16:24:31Z

Antenna -> Antennas

← Older revision		Revision as of 09:24, 12 July 2008
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	Related wiki pages: [[Apparatus]], [[Antennas]], [[Feedlines]]		Related wiki pages: [[Apparatus]], [[Antennas]], [[Feedlines]]

	An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[antenna]].		An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[Antennas\|antenna]].

	== The Tuner Fallacy ==		== The Tuner Fallacy ==

G7VRD: Antenna -> Antennas

2008-07-12T16:21:20Z

Antenna -> Antennas

← Older revision		Revision as of 09:21, 12 July 2008
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	Related wiki pages: [[Apparatus]], [[~~Antenna~~]], [[Feedlines]]		Related wiki pages: [[Apparatus]], [[Antennas]], [[Feedlines]]

	An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[~~antennae\|~~antenna]].		An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[antenna]].

	== The Tuner Fallacy ==		== The Tuner Fallacy ==

TimVK4YEH: intrnal links

2008-07-02T22:44:24Z

intrnal links

← Older revision		Revision as of 15:44, 2 July 2008
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			Related wiki pages: [[Apparatus]], [[Antenna]], [[Feedlines]]

	An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[antennae\|antenna]].		An antenna tuner, also known as a transmatch, is a device for correcting an [[impedance]] mismatch between a transmitter or receiver and an [[antennae\|antenna]].

Hardaker: /* Tuner Models */ Assuming the link to the stub template was supposed to be an inclusion, added an extra {}

2008-04-10T13:05:10Z

Tuner Models: Assuming the link to the stub template was supposed to be an inclusion, added an extra {}

← Older revision		Revision as of 06:05, 10 April 2008
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	The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques.		The most common amateur antenna tuners are the many models made by [[MFJ]]. Other manufacturers also produce tuners. The assembly of a tuner is so simple that many hams build their own from scratch using [[homebrew]] techniques.

	{stub}		{{stub}}

YL: Added a better diagram as an image. (I was the author of the first version of this page; the system thought I wasn't logged in.)

2008-04-10T00:21:22Z

Added a better diagram as an image. (I was the author of the first version of this page; the system thought I wasn't logged in.)

← Older revision		Revision as of 17:21, 9 April 2008
Line 7:		Line 7:
	Suppose that we set up a transceiver system like the one below.		Suppose that we set up a transceiver system like the one below.

	[~~'''Need better diagram drawn as real image'''~~]		[[Image:Tuner_diagram.png]]
	~~\| Transceiver \| ---- \| SWR Meter \| --- \| Tuner \| --- \| SWR Meter \| --- \| Antenna \|~~

	Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.		Suppose that the tuner is set to ''direct'' or ''bypass'' operation, connecting the two SWR meters directly together. If the transmitter is keyed, both SWR meters will indicate the same level of SWR. Assume that the non-resonant antenna has SWR at both meters of 10:1.