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Topic: Antenna tuner

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	Encyclopedia: Antenna tuner (Site not responding. Last check: 2007-10-29)
		An antenna tuner, transmatch, antenna tuning unit, or ATU matches a transceiver with a fixed impedance (typically 50 ohms for modern transceivers) to a load (feed line and antenna) impedance which is unknown, complex or otherwise does not match.
		This mismatch is usually caused when using a non-resonant antenna, one that is not the correct electrical length as compared to the wavelength of the signal.
		A tuned antenna is never as good as a naturally resonant antenna due to additional induced losses on the feed line due to the SWR (multiple reflections), and losses in the ATU itself.
	www.nationmaster.com /encyclopedia/Antenna-tuner (2034 words)

	g5rv
		The antenna functions as two full-wave antennas fed in phase; combining the broadside gain of a two-element colinear array with somewhat lower zenith angle radiation than a half-wave dipole due to its long-wire characteristic.
		Near to each end of such an antenna, the amplitude of the current standing wave falls rapidly to zero at the outer extremities; consequently, the effective radiation from these parts of the antenna is minimal.
		The antenna may also be used in the form of an inverted-V. However, it should be borne in mind that, for such a configuration to radiate at maximum efficiency, the included angle at the apex of the V should not be less than about 120 degrees.
	www.qsl.net /aa3px/g5rv.htm (2260 words)

	ARRLWeb: Antenna Tuner Operation (Site not responding. Last check: 2007-10-29)
		In practical terms, all a tuner does is act as a kind of adjustable impedance transformer between the antenna system and the radio.
		In some antenna tuners the inductance switch is replaced with a continuously variable inductance, popularly known as a roller inductor.
		Depending on the impedance at the antenna input (and the overall design of the tuner) you may not be able to obtain a flat 1:1 SWR on all frequencies and bands.
	www.arrl.org /tis/info/Ant-tuner-op.html (690 words)

	ANTENNA TUNER - HOW TO USE AN ANTENNA TUNER
		What an antenna tuner or transmatch does do, however, is transform the impedance at the antenna feed output at the radio to a value that your transceiver can handle, (typically 50 Ohms.
		It's the SWR between the transmitter and the tuner that is changed with the tuner controls.
		In layman's terms, all a tuner does is act as a kind of adjustable impedance transformer between the radio and the antenna.
	www.hamuniverse.com /tuner.html (1264 words)

	Antenna tuner (Site not responding. Last check: 2007-10-29)
		An antenna tuner is a device which allows the adjustment of the electrical antenna length to the wavelength of carrier you want to receive.
		This allows for example the use of one standard antenna for a broad wave spectrum which is often used in scanners.
		However, an electrically elongated antenna is never as good as an antenna with the precise physical length.
	www.serebella.com /encyclopedia/article-Antenna_tuner.html (387 words)

	A balanced balanced antenna tuner
		Contemporary antenna tuner circuits claim to be able to operate into an unbalanced load or a balanced load such as ladderline.
		Some may ask: "why not use the balanced tuner design that was in vogue in the 1930s?" As many of you old-timers know, the 1930s-era balanced tuner consisted of a resonant or near-resonant, center link-coupled, tank-circuit with movable-clip taps on the secondary.
		These ancient tuners were seldom built in enclosures because near constant access to the clip taps and the inductor(s) was a necessity for changing frequency.
	www.somis.org /bbat.html (5050 words)

	REMOTE ANTENNA TUNER by SM0VPO (Site not responding. Last check: 2007-10-29)
		After doing a bit of messing around with frame and loop antennas I found that they all worked much better outside, but their very narrow bandwidth required them to be manually tuned.
		The obvious answer was some form of remote antenna tuner so that the antenna could be remotely tuned from inside my shack.
		RF was not a problem as both the frame and crate antennas worked well with up to 20 watts without arcing or 'funny happenings' to the servo.
	w1.859.telia.com /~u85920178/antennas/servo.htm (326 words)

	ALPHA DELTA DX-DD 80-40 METERS 82 FT (Site not responding. Last check: 2007-10-29)
		For some installations, it may be necessary to employ the use of an antenna tuner to overcome this detuning situation.
		A good antenna tuner for use with balanced feedline would be needed for such an optional installation and would allow low loss Multi-brand operation.
		If a tuner is to be used in a multi-band arrangement (all HF bands), a recommended alternative arrangement would be to short the shield and center conductor of the coax at the transmitter end, then connect as "long wire" to the random wire output of the antenna tuner.
	www.alphadeltacom.com /dxdd_ii.htm (1330 words)

	QRP Antenna Tuner (Site not responding. Last check: 2007-10-29)
		This is a fairly generic antenna tuner circuit.
		The purpose of a transmatch is to match the impedance of a transmitter, typically 50 ohms, to an unknown antenna impedance.
		Connect the transmitter output to the SWR meter, the SWR meter output to the input of the transmatch, and the antenna to the output of the transmatch.
	www.solorb.com /elect/hamcirc/qrptune/index.html (564 words)

	Automatic Antenna Tuner Circuit Diagram (Site not responding. Last check: 2007-10-29)
		antenna switch circuit of the television tuner of the invention.
		circuit and tuner may be provided doubly to prevent the affection of switching noise.
		The EZ-Tuner is a wide range automatic "memory" antenna tuner based on the versatile...
	www.musical-instruments-guide.com /OPG/automatic-antenna-tuner-circuit-diagram.html (395 words)

	WINDOM ANTENNA
		I use an antenna tuner with the balun coin connected to the antenna tuner.
		The article itself was about history of the bobtail curtain antenna, but there was an interesting note: Loren Windom first described this antenna, but he himself said that it was invented by someone else as a modification of Hertz antenna.
		The reason is very simple; the Windom antenna was referenced to ground as the feed point was between an off-center side point and ground.
	www.zcr.jp /~tada/JA7KPI/windom.html (761 words)

	Broomstick Special, easy-to-build shortwave antenna -- on hard-core-dx.com
		This wire that goes to the tuner can be from 1 meter to 3 meters long (from 3 to 10 feet) but do keep it as short as possible.
		After the antenna is built, you may want to protect it with tightly wound PVC plastic tape over the wire.
		you may use it without a tuner, but results are not going to be as good as when the antenna is connected to the receiver via a well-designed antenna tuner
	www.hard-core-dx.com /nordicdx/antenna/special/bromstik.html (616 words)

	antenna-tuner2 (Site not responding. Last check: 2007-10-29)
		Connect the stator plates of the variable capacitors -- those are the fixed ones -- to each end of the wire, and connect the two capacitors' rotor plates -- the movables ones -- to each other and to your radio's ground connection.
		Now connect the antenna to one side of the ferrite rod coil where it is joins one of the capacitors' fixed plates.
		This simple tuner helps reduce image frequencies that are a problem with less expensive radios, and it also stops some intermodulation problems that make reception difficult in those receivers, too...
	www.radiohc.org /Distributions/Dxers/antenna-tuner2.html (485 words)

	Ham Radio Forum :: View topic - Antenna Tuner (Site not responding. Last check: 2007-10-29)
		When you make a 1/2 wave dipole (what frequency?) you will get a certain amount of bandwidth (whatever frequency your antenna is cut for) and as you tune up or down the band, the SWR will change because the antenna is not resonant.
		The amount of loss in a run of coax to a resonant antenna is pretty low, but if there's a significant SWR on the line, the losses will skyrocket.
		Using an antenna with a tuner on a lower frequency than it is cut for isn't the greatest thing to do as the others have pointed out.
	www.hamforum.com /viewtopic.php?t=1807&view=next (628 words)

	No Tuner Antenna
		At a portable location of mobile operation an antenna tuner could be very helpful, but for the ultimate day to day operation, a resonant antenna performs simpler and better.
		But by calculating for one frequency in the center of your phone band and another in the CW band, then cutting one half of the antenna for the phone frequency and the other for the CW frequency, the SWR is acceptable throughout the end of the entire band.
		If the SWR is not correct, lower the antenna and either shorten the antenna by pulling more wire through the insulator and rewrapping it onto itself or letting out more wire.
	www.antennex.com /preview/notuner.htm (1027 words)

	KK4TR Antenna Mfg And Sales
		The Second Requirement is an External Antenna Tuner to match The SWR to The 50 ohm Output Of the Modern Transceivers.
		The short technical description of the antenna is that antenna functions as a vertically polarized top loaded "T" when the shack activated relay is engaged and loaded up against a modest radial field (I use 36 1/8 wave radials).
		In order to have this antenna work to it's maximum an antenna tuner is a must at the feed point of the center vertical element.
	kk4tr.tripod.com /index-10.html (3727 words)

	xtal set with antenna tuner
		These coils are uncomlicated to assemble (especially for beginners), but the performance is somewhat lower as of spiderweb-coils or ferrite-pot-core-coils or large-diameter cylinder coils.
		Antenna connections: Sockets 1-6 are used to find the best connection for the antenna.
		May be that you must connect the antenna plug to another socket when tuning towards to band ends.
	www.oldradioworld.de /gollum/tuner.htm (704 words)

	Untitled (Site not responding. Last check: 2007-10-29)
		Many FT-817 owners have a keen interest in having a compact antenna that can be mounted proximate to the rig, produce reasonable performance, and not be excessively costly.
		To make the antenna, simply drill out the hole at the base of the whip adequate to clear the small screw that goes into the banana plug.
		If you already have the AGU and the antenna tuner, the your cost is almost nothing.
	www.w4rt.com /faq/antenna-how-to-build.htm (640 words)

	WiMo: Various antenna tuners
		The CG-2000 is a very affordable automatic tuner for shortwave 1.6 to 30MHz, for feeding verticals, longwires, dipoles etc. Like the well known SG-230 this tuner is primarily intended to feed wireantennas or monopoles, the antenna connector is simply a high voltage connector.
		The tuner uses a Pi network design which has the advantage (compared to L networks) that is acts as an additional low-pass filter, reducing spurious emissions.
		Now if you want to tune a manual tuner or antenna you have to switch to CW or FM, reduce power, push PTT, tune, then revert back to the mode and power level where you came from.
	www.wimo.com /tundiv_e.htm (893 words)

	LDG Electronics Inc.
		Once the tuner has initially matched the frequency with the antenna you are using, it retunes almost instantly, even with SSB.
		So when we say that our tuners are thoroughly tested, we have high levels of quality control, and we over-engineer our products to make them last longer-you know that we mean it.
		If you have to make adjustments to your manual tuner 5 times per day (just think about it for a minute-that's most of us) and it takes you 30 seconds to retune, you're spending more than 900 minutes a year tuning.
	www.ldgelectronics.com (354 words)

	How to Build a Dipole Antenna - eHow.com
		A dipole antenna offers a new ham operator or shortwave listener a simple, economical means of getting on the air quickly.
		Plan on using an antenna tuner so there will be no need to shorten or lengthen antenna legs.
		Make sure the antenna mast is mounted directly to the ground; if it isn't, place the ground rod as close to the mast as possible and run a grounding strap to the mast.
	www.ehow.com /how_4530_build-dipole-antenna.html (681 words)

	[No title] (Site not responding. Last check: 2007-10-29)
		Remove the input coax attached to antenna tuner from FO connector on filter unit (X51-340-00).
		Cut coax on the input connector of antenna tuner in half and connect cut the end to switch unit PC BOARD where short antenna wire was removed and shield to ground.
		Solder other half of coax to antenna connector and shield to ground, and plug other end into output connector of antenna tuner.
	www.phreak.org /radio/mods/ts440_at.txt (149 words)

	The Pirate Radio Survival Guide - SWR
		This means that all RF power is being radiated by the load or antenna and none of it is being reflected back.
		Now, in the chapter on antennas we discussed how to "cut" a dipole for the 40 meter pirate band, However, depending on the antennas proximity to other structures and height from ground, the math used to determine the length of the antenna is only a close approximation.
		The only advantage to using an antenna tuner is in the rare case you cannot erect a resonant antenna, a antenna tuner will let your transmitter load up into just about anything, but it is NOT and should NOT be used as a substitute for a RESONANT antenna!
	www.frn.net /special/prsg/swr.html (843 words)

	T-Network Tuner Simulation (Site not responding. Last check: 2007-10-29)
		The SWR is shown both digitally in the upper left and on the SWR meter.
		The loss in the tuner is shown as a percentage of input power and the equivalent loss in decibels.
		Clicking the autotune button will attempt to have your computer calculate values of the components that should perfectly match the load and give low loss in the network assuming that the capacitors have much higher Q than the coil.
	fermi.la.asu.edu /w9cf/tuner/tuner.html (492 words)

	Emtech ZM-2 Antenna Tuner Kit (N5ESE Version)
		The Emtech ZM-2 Antenna Tuner is a nifty little portable transmatch for QRP (low power).
		It utilizes the well-known Z-match circuit, which is especially useful for balanced antennas (like dipoles and loops).
		I find myself reaching for this tuner anytime I have a notion to experiment with antennas (which is often).
	www.io.com /%7En5fc/zm2.htm (1130 words)

	WiMo: Various antenna tuners
		The tuner has a tuning range of 12 to 1000 Ω Der CG-2000 ist ein sehr preisgünstiger Automatiktuner für 1.6-30 MHz zur Speisung von Vertikals, Langdrähten, Dipolen etc. Wie der bekannte SG-230 ist der Tuner in erster Linie zur Speisung von Drahtantennen oder Monopolen ausgelegt: Ausgang ist eine Hochspannungsdurchführung.
		The minimal required antenna length is 2.5m for frequencies of 6MHz and up, or at least 8m for 1.8MHz and up.
		Matches antennas with coax- parallel wire feed, short verticals or long wires, SWR range from 15:1 or higher.
	www.wimo.de /tundiv_e.htm (893 words)

	Outback Marine HF Radio Tuner Products
		The versatile AT-130 can be used with a variety of vessels, even smaller boats that cannot use a long antenna element.
		Just push the [TUNE] switch on an Icom HF marine transceiver; the AT-130 adjusts the antenna and the transceiver to the minimum SWR in any frequency on an HF marine band.
		This allows it to be conveniently installed near the antenna element base.
	www.outbackmarine.com.au /MasterPages/TypeDetail/TypeDetail.asp?TypeID=101 (351 words)

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