Mobile antenna - Revision history

TimVK4YEH: added internal links

2010-11-05T09:29:49Z

added internal links

← Older revision		Revision as of 02:29, 5 November 2010
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			Related wiki pages : [[Antennas]], [[Propagation]], [[Bands]], [[Apparatus]]

	Mobile antennas are designed to be used for operation while in motion. Their uses include pedestrian mobile operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use while driving.		Mobile antennas are designed to be used for operation while in motion. Their uses include pedestrian mobile operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use while driving.

Carlb: /* Pedestrian Mobile */

2009-06-05T23:03:34Z

Pedestrian Mobile

← Older revision		Revision as of 16:03, 5 June 2009
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	Antennas for handheld transceivers tend to be limited due to space constraints, with vertical antennas of 1/4 wavelength (at VHF) or smaller commonly used.		Antennas for handheld transceivers tend to be limited due to space constraints, with vertical antennas of 1/4 wavelength (at VHF) or smaller commonly used.

	Antennas for handheld transceivers typically do not provide a proper ground plane; the unit itself and any attached cables (such as external speaker/microphone or power) serve as a rudimentary ground plane for a vertical antenna.		Antennas for handheld transceivers typically do not provide a proper ground plane; the unit itself and any attached cables (such as external speaker/microphone or power) serve as a rudimentary ground plane for a vertical antenna. The smallest handheld antennas will require built-in [[antenna loading]] coils to obtain resonance even at VHF wavelength, with a corresponding loss in efficiency. The lower power and smaller antenna will provide greatly reduced coverage for handheld units, compared to almost all other classes of mobile or fixed station.

	== Mobile Antenna Design ==		== Mobile Antenna Design ==

Carlb: /* Mobile Antenna Design */

2009-06-05T23:00:21Z

Mobile Antenna Design

← Older revision		Revision as of 16:00, 5 June 2009
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	== Pedestrian Mobile ==		== Pedestrian Mobile ==
	Antennas for handheld transceivers tend to be limited due to space constraints, with vertical antennas of 1/4 wavelength (at VHF) or smaller commonly used.		Antennas for handheld transceivers tend to be limited due to space constraints, with vertical antennas of 1/4 wavelength (at VHF) or smaller commonly used.

			Antennas for handheld transceivers typically do not provide a proper ground plane; the unit itself and any attached cables (such as external speaker/microphone or power) serve as a rudimentary ground plane for a vertical antenna.

	== Mobile Antenna Design ==		== Mobile Antenna Design ==
			Most antennas in land-mobile operation are verticals, both due to their smaller size (as compared to [[dipole]]s and their derivatives) and their omnidirectional characteristics. As a vertical antenna is effectively one-half of a dipole, it may be as small as one-quarter wavelength but normally must be operated against a ground plane. For antennas mounted on vehicles and small watercraft, the metal body of the vehicle itself is most often connected to the station ground and used as a groundplane.

			Where insufficient space exists to accommodate a quarter-wavelength or larger antenna (typically an issue for HF or mediumwave antennas in mobile operation), [[antenna loading]] coils are used to lower the resonant frequency of the antenna. Selection of suitable loading coils for each individual HF band is typically done manually, using either a single variable inductor (as in the [[screwdriver antenna]]), a single inductor with multiple manually-selectable taps to allow part of the coil to be bypassed at higher frequencies, or by using a series of interchangeable elements with different loading coils for each band.

	== Capacity Hats ==		== Capacity Hats ==

Carlb: /* Pedestrian Mobile */

2009-06-04T15:40:27Z

Pedestrian Mobile

← Older revision		Revision as of 08:40, 4 June 2009
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	== Pedestrian Mobile ==		== Pedestrian Mobile ==
			Antennas for handheld transceivers tend to be limited due to space constraints, with vertical antennas of 1/4 wavelength (at VHF) or smaller commonly used.

	== Mobile Antenna Design ==		== Mobile Antenna Design ==

Carlb: /* Capacity Hats */

2009-04-09T00:55:25Z

Capacity Hats

← Older revision		Revision as of 17:55, 8 April 2009
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	Refer to KE4UYP's article on [[Capacity Hats]].		Refer to KE4UYP's article on [[Capacity Hats]].


			{{antennas}}

YL: Needed to fix internal link to pedestrian mobile.

2008-04-10T01:18:21Z

Needed to fix internal link to pedestrian mobile.

← Older revision		Revision as of 18:18, 9 April 2008
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	Mobile antennas are designed to be used for operation while in motion. Their uses include ~~[[Mobile antenna#Pedestrian Mobile]]~~ operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use while driving.		Mobile antennas are designed to be used for operation while in motion. Their uses include pedestrian mobile operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use while driving.

	Mobile antennas should not be confused with [[portable antenna\|portable antennas]], which are designed to be easy to transport and set up, but are not used while in motion.		Mobile antennas should not be confused with [[portable antenna\|portable antennas]], which are designed to be easy to transport and set up, but are not used while in motion.

YL: Mobile moved to Mobile antenna: "Mobile" is too vague. Anything can be mobile. Mobile antenna, mobile operation, mobile wiring issues...

2008-04-10T01:16:51Z

Mobile moved to Mobile antenna: "Mobile" is too vague. Anything can be mobile. Mobile antenna, mobile operation, mobile wiring issues...

← Older revision	Revision as of 18:16, 9 April 2008
(No difference)

YL: Beginning of article explaining mobile antenna usage, types, and design techniques.

2008-04-10T01:16:03Z

Beginning of article explaining mobile antenna usage, types, and design techniques.

← Older revision		Revision as of 18:16, 9 April 2008
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	#~~REDIRECT~~ [[Capacity Hats]]		Mobile antennas are designed to be used for operation while in motion. Their uses include [[Mobile antenna#Pedestrian Mobile]] operation while walking, bicycle-mounted antennas for use while riding, and the most common form, automobile-mounted antennas for use while driving.

			Mobile antennas should not be confused with [[portable antenna\|portable antennas]], which are designed to be easy to transport and set up, but are not used while in motion.

			== Automobile Mobile ==

			Mobile antennas for automobiles are usually [[vertical\|verticals]] of limited height. They must allow the vehicle to be driven under an overpass or tree branch without damaging the antenna or vehicle. A common maximum height for this type of antenna is 13 feet 6 inches (410 cm). On [[VHF]] and higher frequencies this is not difficult, but [[HF]] requires that mobile antennas be [[antenna loading\|loaded]].

			== Pedestrian Mobile ==

			== Mobile Antenna Design ==

			== Capacity Hats ==

			Refer to KE4UYP's article on [[Capacity Hats]].

Ke4uyp: Mobile moved to Capacity Hats

2008-02-08T12:18:35Z

Mobile moved to Capacity Hats

New page

#REDIRECT [[Capacity Hats]]