If there is more than one reflective surface in the antenna, as in a corner reflector antenna, each surface forms its own image of the antenna elements.

If only a certain portion of the electrical power received from the transmitter is actually radiated by the antenna ( its efficiency ) the directive gain compares the power radiated in a given direction to that reduced power, ignoring the inefficiency.

If these impedances are not equal, it causes a condition called standing waves, in which the power is reflected back from the antenna toward the transmitter, wasting power and sometimes overheating the transmitter.

If coming directly from the radio studio at a single station or television station, it is simply sent through the studio / transmitter link to the transmitter and hence from the television antenna located on the radio masts and towers out to the world.

If they were on the left side of the centreline they would hear a series of short tones followed by longer pauses-the pauses being the time the signal was being sent out the other side of the antenna.

If they started on the right side, they would instead hear a series of longer tones followed by short pauses, while the signal was on the " dot " side of the antenna.

If the signal from antenna A is taken as the reference, inaccuracies in the delay will lead to errors and in the phases of the signals from tapes B and C respectively ( see drawing on right ).

If those fields extend some distance into space the structure is often termed an antenna.

If full-wavelength spacing is used between antenna elements in an array, the ERP is increased approximately in proportion to the number of elements.

If a coil is made using coaxial cable near to the feed point of a balanced antenna, then the RF current that flows on the outer surface of the coaxial cable can be attenuated.

If cut off, an antenna will grow back after several months.

If the required distance is greater than the range of the wireless call box, an external antenna can extend the range.

If a transmitter is tested without a load, such as an antenna or a dummy load, the transmitter could be damaged.

If an application requires working mostly outdoors, a VHF radio is probably the best choice, especially if a base station radio indoors is used and an external antenna is added.

If it is not possible to build a second antenna for the second transmitter due to space constraints, then the diplexer is used permanently.

If two-way communication is needed, the boat must ascend to periscope depth ( just below the surface ) and raise a telescopic mast antenna to communicate on higher frequencies ( such as HF, UHF or VHF ).

If all the elements are in a plane, usually only one reflector is used, because additional ones give little improvement in gain, but sometimes additional reflectors are mounted above and below the plane of the antenna on a vertical bracket at the end.

If a simple open-ended waveguide is used as an antenna, without the horn, the sudden end of the conductive walls causes an abrupt impedance change at the aperture, from the wave impedance in the waveguide to the impedance of free space, ( about 377 ohms ).

If an antenna delivers an output power of P < sub > o </ sub > watts to the load connected to its output terminals when irradiated by a uniform field of power density PFD watts per square metre, the antenna's aperture A < sub > eff </ sub > in square metres is given by:

If the antenna were perfectly efficient, all the radio power falling within its physical aperture would be converted to electrical power delivered to the load attached to its output terminals, so these two areas would be equal A < sub > eff </ sub > = A < sub > phys </ sub > and the aperture efficiency would be 1. 0.

If this does not succeed after several attempts, the antenna may be damaged and the transmitter should remain switched off.

If a small loop antenna's loss is 50 dB ( in effect, the attenna includes a 50 dB attenuator ), the electrical inefficiency of that antenna will have little impact on the receiving system's signal-to-noise ratio.

If the circumstances are faced frankly it is not reasonable to expect this to be true.

If his dancers are sometimes made to look as if they might be creatures from Mars, this is consistent with his intention of placing them in the orbit of another world, a world in which they are freed of their pedestrian identities.

If a work is divided into several large segments, a last-minute drawing of random numbers may determine the order of the segments for any particular performance.

If they avoid the use of the pungent, outlawed four-letter word it is because it is taboo ; ;

If Wilhelm Reich is the Moses who has led them out of the Egypt of sexual slavery, Dylan Thomas is the poet who offers them the Dionysian dialectic of justification for their indulgence in liquor, marijuana, sex, and jazz.

If he is the child of nothingness, if he is the predestined victim of an age of atomic wars, then he will consult only his own organic needs and go beyond good and evil.

If it is an honest feeling, then why should she not yield to it??

If he thus achieves a lyrical, dreamlike, drugged intensity, he pays the price for his indulgence by producing work -- Allen Ginsberg's `` Howl '' is a striking example of this tendency -- that is disoriented, Dionysian but without depth and without Apollonian control.

If love reflects the nature of man, as Ortega Y Gasset believes, if the person in love betrays decisively what he is by his behavior in love, then the writers of the beat generation are creating a new literary genre.

If he is good, he may not be legal ; ;

If the man on the sidewalk is surprised at this question, it has served as an exclamation.

If the existent form is to be retained new factors that reinforce it must be introduced into the situation.

If we remove ourselves for a moment from our time and our infatuation with mental disease, isn't there something absurd about a hero in a novel who is defeated by his infantile neurosis??

If many of the characters in contemporary novels appear to be the bloodless relations of characters in a case history it is because the novelist is often forgetful today that those things that we call character manifest themselves in surface behavior, that the ego is still the executive agency of personality, and that all we know of personality must be discerned through the ego.

If he is a traditionalist, he is an eclectic traditionalist.

If our sincerity is granted, and it is granted, the discrepancy can only be explained by the fact that we have come to believe hearsay and legend about ourselves in preference to an understanding gained by earnest self-examination.

If to be innocent is to be helpless, then I had been -- as are we all -- helpless at the start.

If the Bastarnae remained an identifiable group, it is highly likely that they participated in the vast Gothic-led migration, driven by Hunnic pressure, that was admitted into Moesia by emperor Valens in 376 and eventually defeated and killed Valens at Adrianople in 378.

If mineral acid is added to the acetic acid mixture, increasing the concentration of hydronium ion, the amount of dissociation must decrease as the reaction is driven to the left in accordance with this principle.

If sugars are heated so that all water of crystallisation is driven off, then caramelization starts, with the sugar undergoing thermal decomposition with the formation of carbon, and other breakdown products producing caramel.

* Overrunning clutch or freewheel: If some external force makes the driven member rotate faster than the driver, the clutch effectively disengages.

If a chemical reaction is driven by an external applied voltage, as in electrolysis, or if a voltage is created by a chemical reaction as in a battery, it is an electrochemical reaction.

If the current is driven in the opposite direction by imposing an external potential, then work is done on the cell to drive electrolysis.

If an external time dependent force is present, the harmonic oscillator is described as a driven oscillator.

If the graphics is driven by an application program, plot commands can be fed to gnuplot via a pipe.

If ATO fails but TBTC is still operational, the trains can still be manually driven at line speed.

If a capacitor is driven with a time-varying voltage that changes rapidly enough, then the polarization of the dielectric cannot follow the signal.

If the diode is driven strongly enough, additional side modes may also lase.

If the PSAP receives calls from the telephone company on older analog trunks, they are usually Pulse driven circuits.

If not otherwise specified, " right " and " left " can be reversed to reflect jurisdictions where vehicles are driven on the left.

If instead we assume that the volatility has a randomness of its own — often described by a different equation driven by a different Brownian Motion — the model is called a stochastic volatility model.

If the torque applied to one of the drive wheels exceeds the threshold of traction, then that wheel will spin, and thus only provide torque at each other driven wheel limited by the sliding friction at the slipping wheel.

If one belt broke, the vehicle could still be driven.

If the reporter gene integrates near an enhancer, its expression will reflect the expression pattern driven by that enhancer.

If the modulator is driven at the same frequency as the cavity-mode spacing Δν, then these sidebands correspond to the two cavity modes adjacent to the original mode.

If the development is technology driven then R & D is directed toward developing that market research indicates will meet an unmet need.

If the Serbs had broken through the Bulgarian defences, they might have doomed the 2nd Bulgarian Army and driven out the Bulgarians entirely out of Macedonia.

If the chairlift stops suddenly ( as from use of the system emergency brake ), the carrier's arm connecting to the grip pivots smoothly forward — driven by the chair's inertia — and maintains friction ( and seating angle ) between the seat and passenger.

If cattle are driven into, or of their own accord enter, the water, they are commonly not molested ; but if by chance some unusually big or ferocious specimen of these fearsome fishes does bite an animal — taking off part of an ear, or perhaps of a teat from the udder of a cow — the blood brings up every member of the ravenous throng which is anywhere near, and unless the attacked animal can immediately make its escape from the water it is devoured alive.

If he finds that his deeds were driven by ulterior motives or improper thoughts, let him search for the positive aspects within them.

If the input differential voltage changes significantly ( more than about a hundred millivolts ), the base-emitter junction of the transistor driven by the lower input voltage becomes backward biased and its collector voltage reaches the positive supply rail.