The Bridgeport times and evening farmer., 1922-05-04
Radio Nipples
 Edited by Leslie A. Gould
Be.vare of Rootleg Vacuum Tubes.

Beware of Bootleg Vacuum Tubes.
 Amateurs are being warned against the purchase of ''bootleg'' vacuum tubes which are illegally Inanufac- tured in violation Of the patent rights held by the inventors. The boot 1egger' has no name stamped on it 50 Ga2y have a forged name and does not cofr-i~ ta a, box stating that it is Scensed and hy whom iS is made. Some of the s'ooGtleggers'' will work and others won't. Five Of the Illicit tubes purchased in Brooklyn were tested and out of the total only one worked.
 <1n Radio Sour This Cows Milk?
 4ae old dinner beM on the farm may be scrapped now, according to the TaIbots. a family of Florida farm CTS. When Daniel goes out to blow and puts the receiver to his ear. And now and then the broadcastfng sta tions are interrupted by Mrs. Talbot who has a sending outfit at the house. She calls Hubby Talbot when it is time for dinner.
 Questions and Answers.
 Radio Editor-Question: Which is the best, two steps of application and a MagnavoX or three steps and an Amplitron? What voltage should be used in the third step?
 Answ0r: The Magnavox will give the best results. but all these metal horns are more or less ''tinny." For real results a wooden horn should be used. This lesson was learned good many years aago by the phono- graph industry, but the manutactur- CTS of radio loud speakers have to learn it all over again. This depart ment does not recommend the use of the third step or amplifcation as it usually is very noisy unless made exactly right
 Question: Where can I purchase drawings for making a receiving set? T want one that will receive at least 400 miles.
 Answer: Most of the publishers of he showing how to make sets Several good sets have also appeared on these pages. More will tUflow No one can give you a drawing of 8 set with guarantee that the set will work 400 miles. Such factors as the skill of the builder and the operator as well as local conditions under which the -+ati0n must work have too much to with the matter.
 John Owen-Question: What shape counterpoise shall I use in conjunc- tion with a, cage aerial 100 feet long and 50 feet high?
 Answer: Construct 6 fan-shaped counterpoise.
 George Wood encloses a standard the secondary of an audion receiver and asks:
 l. The size of each coil Give al- together) to receive P. O. z.
 ?. Is there any advantage In using 11O volts on the oscillator through filter?
 3 Is an A P. amplifier suitable for the oscilIator and a w. E. T. 1 as the detector?
 Answer: 1. Use two 1.ooo-turn coils for primary and secondary, with some small coil of such as 26 turns to couple the hetrodyne. The coils. You probably would get bet ter results using an Armstrong hook up with the other bulb as a step of amplificaJion.
 ?. There is no advantage. It might work however. The Navy tried this stunt some time ago, but has dis cart7 ed it.
 8 The tubes you mention are ex- ceIlent for the purpose. Use 45 volts or more for the plate.
 Question: Our house Is over 30 feet high If I stretch the Antenna from the house to a tree will have the de sired length, but the wire will be only one foot above the roof. Will this affect the instruments?
 Answer: If it is a. tin roof 1t will seriously affect your instruments. But in any event you are counting trouble by such an arrangement. Better try to arrange your Antenna so 1t will not traverse the entire roof
 Question: Would like to know if the antenna wire has to be bare or can be insulated? Can it be less than 75 feet long? Aand can the
 Answer: Antenna can either be bare or insulated, but it is not advis- able to have 1t any less than 100 feet. Ordinary electric light wire can be used. Recommend 7-22 copper wire.
 Question: My house is 20 feet high. A tree GO feet distant is 40 feet high. Will an antenna stretched from the top of the tree to the top of the house be satisfactory?
 L. A G.
 Answer: Such an antenna would work. but 1t would be better If you could arrange to make it 100 feet long.
 I. J. asks, which is the best for am- p1iffcatfon radio or audio frequency? Answer: Audto frequency with two or more steps of anplification will howl With the radio frequency there is no bowling and any number of steps my be used