1925-04-15 — Page 9

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THE HONGKONG TELEGRAPH,

WEDNESDAY, APRIL 15, 1925,

Radio Notes & News.

The Use of Short Waves: Conclusion of

Saturday's Article,

this life. As a premium to my perseveranco, my log registers 69. American, 16 Australian and 6 Now Zealand amatours..

My hoartiost thanks to you, Mr. Editor, for tho publication of my articles, to Messrs. Almsida and Ribeiro, for their kindness in preparing aamo, and to all those radio fans, who have 80 The colls should have a clear incoming signals from stations space completely around them thousands of miles away kindly written to mo. I regrat I could not answer each of them of about two inches, and not. loss. Transformer-The higher the individually, for want of time. than one. Also, no coils that are ratio, the botter but it should not If any one of them after making not in use should be placed in be used for telephony, as the "Wesgant "...” finds any close proximity to the coils of distortion will be foarful with difficulty, I will again the roogiver, because Morecraft such high ratio. If, le Hongkong, through the medium of your valu- discovered that the presence a transformer of 10 to 1 ratio, arable paper give a final articlo of an unused ocii foar o 7 to 1 ratio is unprocurable, one clearing up all doubis. It is bot- receiver increased the resist of 5 to 1 ratio, can also be a ter for them to make a trip over anco of the secondary coll of the used. The balance to be said to Macao, where they will find ceceiver, to about 90 ohms. about this amplifier in just the an ugly receivor, which, in the Readers will bo surprised, no sanie as that for a broadcasting opinion of a well-known Hong- doubt, with the many remarks on receiver (see first article), ex kong amateur, is not worth this short wave receiver; but as cepting that the fixed condenser two dollars. In my next article, its technicalities differ immersoly of 001 mfd. shunting the primary, I will give full information on from those of telephony. It is in of the transformer and the "O" what sizes of coils are to be used portant that they should grasp battery are not necessary.

for various wave-longths, and all the advice and details as There is not much lofe to say the easy manner of building aa givon, because they are from now, except as regards the efficient wayometer for calibrat those who have experimented, tuning, whic! may seem a little ing. receivers sto...," etc.—J/"DA and found it to be correct.

TICKLER CONDENSERS, One of 00025, mfd, is necessary (Maximum). The body effect is less pronounced on this.

FIXED CONDENSER...

The two large fixed condensers

difficult atst, as there" are three controls, and only two hands to operate them...

TUNING.

After lighting the filaments of

ROOHA SARAIVA

KISSING BURGLAR.

the valvos, the receiver will start A"kissing burglar" has been to oscillate, when the dial of the busy in ono section of London the of 1 or 2 mids. shunting the tickler condenser is on or about recently. After robbing "A" and "B" batteries (as stated 60 degrees, and the serial con-house, he kisses any girls he finds no in my first article, denser near zoro, loava tho in bed and makes his escape. by

makes that can be dispensed with, un-ticklor condensor in this position, less the batteries are far away and with the secondary conden- CRISIS OVER RENT RESTRICTION, The Manx House of Kaye re- from the receiver) are absolutely ser, search for signals. necessary on waves shorler than Important: The regeneration contly by 20 votes to 2. asked the 100 metres, whether the batteries must always bo kopt to a Governor to dissolve the House minimum, which can be easily on the question of the Roat Re- are far away or near.

done with the aerial condenser,servation Act..

GRID CONDENSER:-

if the polarity of the coil is

The House was only elected

It should be a good one of mica (or better, of air dielectric) of correct. All the coils should be four months ago and has twico

PRIMARY

TICKLER

AKCENDANS

"A"

-30 DND

.0001 to 0003 mfd, according to wound in the the same direction,

the make of the valve.

GRID LEAK:—

and their connections made as in the figure below.

passed a rent restriction bill which was thrown out by the Legislative Council

The Council suggests legisla- tion to enable tenants of small. houses to buy the dwellings.

In the event of an election the members of the present House will fight as one party with a few exceptions. The question as to dissolution is being considered by the Governor and the Council, and a decision is soon expected.

ARE YOU BLONDE OR BRUNETTE ?

It is good to try several values As the tickler coil is "placed between 1 to 5 megohms. I use, within the secondary coil, it with a Dutch valve. type R a must therefore be fixed on the condenser of .0003 mfd, and a grid side of the lead that goes to the leak of 2 megohms. For English | Glament, valves type "R", the same values. WHEN TO LISTEN-IN..

It is a physiological fact that RHEOSTATS:--

It seems now that I have said They are placed on the nega- all I can about my "Weagant dark persons are more subject to constipation than those who are tive load of the "A" battery on short waves, and I will add a

Choke Coil-50 turns No. 24 word to readers, in order that fair. Still, everybody needs lax- DCC wire wound in jumble they may be successful, for to ative assistance sometimes, and fashion. This was fully described obtain auccess a great deal of Pinkettes suit both sexes, all in my first article.

patience is necessary!~~~

They correct constipation, "B" Battery: Voltage, batween

To pick up messages from the

Blok 70 to 100 volts, for Dutch valves, American amateurs, lister-in dispel bilious attacks,

headaches, liverishness, clear the between 5 to 11

p.m., the The connection, from

the European amateurs at 2 a.m., and complexion, purify the breath. secondary to the ground, as shown the Australian and New Zealand For Piles they give speedy relief. in the drawing, is optional. With amateurs about 6 pm., and G Your chemist sell Pinkettes, or this connection, the receiver will am, that is the whole night. In post free, 60 cents the vial, from be, noted to oscillato more this cold weather, I have pick-Dr. Williams' Medicine Ca., 60 promptly, but the inductions will ed pp messages from Ivan Kiangse Road, Shanghai,

type "R"

be stronger. Therefore it is pre ferable not to use it.

AMPLIFIER.

It is important to note that not mora than one stage of audio frequency. amplification should

of.

Mears, a New Zealand amateur, and many other amateurs Australasia, when it is 4 a.m.) there and I am, here, they sticking to their keys, whilst most of you, readers, are fast

be used. Two stages will give asleep. Perseverance is necess greater volume to local induct ary for everything: without it, ions and interferences than to the nothing can be accomplished in

rapes and every age.

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