1923-10-31 — Page 5

Okeh Records

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8 Des Vœux Road, Central,

(Corner of Ice House Street.)

Tel. No. C.4453.

Tel. No. C.4453

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AN

THE HONGKONG TELEGRAPH,

RADIO NOTES AND NEWS. The Question of Earth Connections.

dition known

as

WEDNESDAY, OCTOBER 31, 1923,

Kinks O'

The Links

An earth connection of low and It may be explained here for constant high frequency resist the benefit of those who do not

Question: Is there any case ance is of great value in wireless already know, that the effect reception, and essential for trans- of reaction on a circuit is to in which it is possible to re-tee a mission, says Popular Wireless tend to neutralise resistance of ball after a stroke has been

played! kly. Not only will it tend that circuit to high frequency

Answer After stroke has towards strongersignals, but what currents. If reaction is used to is probably more important, selec- its utmost, the effect is to not been played, even though the tivity will be greatly improved. only neutralise this resistance, club did not come into contact The latter is not often realised, but to actually produce a con- with the ball, which rulls from a and now that reaction on the

"negative"lee, it is not possible to re-tee the aerial circuit is prohibited during resistance. When in this con-ball because it is in play and broadcasting hours, it is more dition the slightest impulse given must be played from its lie. than ever necessary that there to the circuit will set it oscillat- Only when a ball falls or is shall be as little damping as pos- at the frequency to which it is knocked from the tee while a sible in the aerial to earth circuit. tuned, and these oscillations will player is in the act of addressing Resistance in the atrial-earth build up to certain value it has the player the right to circuit, whether it be at the point and continue theoretically in-re-ter same. of earthing, in the earth lead, or indefinitely, after. it should be

Question: Is it permissible furi the windings of the inductance it be noted, the impulse has died

player to

remove a loose self.causes damping of the oscilla-out.

impediment that is lying in front. tion in the cirenit and this wil We may now proceed to test of his ball, regardless of the course means that the tuning is our variety of earth connections distance that it may be from broadened. It is surprising how tand combinations of same) by same? Does it make a difference sharply L. O can be tuned in simply connecting them up in whether the ball is through the the London area, using a simple turn, and noting the degree! green or on the green as to the

reaction necessary in removal of a loose impediment? circuit crystal receiver, provided | of that the high frequency resistance of the aerial circuit is kept low by winding the turner with thick wire and using an efficient earth

connection.

3

៨.

each case to cause uscillation. Answer Through the green a Of course those which require player has a right to remove loose large degree of reaction have high resistance, and should be impediments that do not lie far- rejected. The conscientions ex-ther than a club length from the ball. If it is a greater distance perimenter need have no qualms than a club length he cannot re- ahout causing the set to oscillate, move same, unless it is on the as in this case it is quite un putting groen. A player is always necessary to

within his rights in removing any length where any transmission isse impediment from the put- taking place.

As would be expected, the line sreen that he feels will inter- fere with his next shit, whether paralleling of two or more earth his hall is on the green or not. connections often results in one

Question:-Du styníes apply in of lower resistance than either!

t

to 2 Wie

It is apparent therefore that it will be met useful to have sure method whereby we can compare the high frequeary resistater of different cartis" uch as water main. gas main, eistern, or buried Iplate It right he thought that the best method to do this would 1be to ture in a station on the receiver, and then serve the length each of the different | individually, but it is interesting four-ball matches?

mean is to note that this is by no

Answer: Stymies do not apply connections. Thi- earth unsatisfactory however, from always the case, notably where in four-ball matches. In a four- F in the leads are of widely differing ball match when on the putting many points of view. Stance, my light en inge in wavelengths, thus, can-ing paths of green any player can have any length produced 1s à different different wave-length, a similar other hali lifted or player at the "earth would necessitateretuning effect in that which occurs when option of its owner. when the value the te-t would the lead-in wire of a "T" Spe (question When a ball is lifted he nii. Al it is very difficult serial is not taken from the centre from "ground under repair" to arrurately note changes in

what is the proper proceedure? In conclusion it may be stated the intensity of sounds which are

Answer: The ball must be separated by an interval of that the subject of earth resi-:-

possible tu several seconds, representing the ances will be found most interest-dropped as near time during which the wires are ing and instructive and will amply where it lay, but not beater the heing changed.

repay any trouble taken in ex- periment especially as emphasised before. now that direct reaction on to the aerial circuit is forbid. den during broadcasting hours.

FRENCH AMATEURS ANNOYED.

The method employet relies on the fact thar different values of reaction are required to cause a simple antedyne circuit

seilture, depending on the damp- ing of high frequency resistance of the aerial to earth circuit. A simple single valve direct coupled reacting receiver should there- fure be

uner up The -hould preferably have a rutary reacting coil. which should be provided with a pointer and scale. The filament and high tension voltage should be set to a fixed value for 1 four Volt Blament battery without rheostat may be user), and the grid leak should be of such a value that there is no apparént "overlap” present.

If everything is working pru perly it will be found that when the reaction elupling is in creased, at a certain point ou the scale the set will commence to scillate."and when the coupling

is loosened again the set rease to Coscillate at -xartig the same

spot.

of the horizontal enmponent.

hode.

sounds the death-knet of the amateur experimenter. It fixes The chief topic of conversation the

on private sending in French radio circles recently-stations at 100 francs a year per all talk between kilowatt and a further tax of 20 silencing amateurs of neurodyne, super to 40 francs per year per unte heartedne, super amplification, measured at the source of supply, and all the other supers, has been

the new Wireless Decree drawn. This means, for example, that up by the Postal and Telegraphic Radiola may have to pay between Department.

When the terms 40 and 500,000 francs per annum. and that the amateur with a of the decree became known howl of protest was immediately home-made set of considerable max find raised, and the editor of that experimental value popular little paper L'Antenue himself faced with a tax-paper went far as to send a dissent-amounting to half as much as ing letter to the President of the his set cost to erget. Unless the Republic urging him not to sign decree is modified the enthusiastic the decree. But the decree was amateurs will have to close down!

their little stations and this wili. signed all the same.

Most of the clauses in it are re- without a doubt, be a great pity. asonable enough, as precise re-for the French amaten: has done! for T.S.F." than his gulations concerning the erection more

of receiving set bave long been (iovernment and

|

that

2

wanted in France. One clause. fraction of the millions which however, is objected to, as it the latter has spent.

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