Components Required.

Radio Record, Volume II, Issue 26, 11 January 1929, Page 28

Components Required.

Alb. 22’s enamelled wire Crystal Knob or dial 2 terminals Wood, celluloid, brass

a be made. Soldered joints are best, using resin-cored solder. Any type of crystal can be used, but if a cat’s-whisker type is preferred it could be placed on the baseboard. Tuning is accomplished by turning the knob until full volume is obtained. The fewer'the turns of wire put on the lower the wavelength that can be receiyed,. but lowering the range in this way cuts off higher wavelengths. The construction allows of turns being easily taken off both sides of stator and rotor if found necessary. The materials required are specified on previous page, approximate cost also being given. Good Record. GET with a erystal set and twob stage amplifier six Australian and six New Zealand stations, total 12 stations to its eredit, yet since I have "pought a new B battery I have not heard an Aussie. What is the cause of this? If all the batteries are connected up to the set and left alone for a few days will the batteries run down? I use a © battery, as I find it helps a great deal. Also, I used to get 2YA on 30 on the dial and now I get it best at O, and I would be very pleased if you could help me in any way, as the set has functioned very well up till the present. It also whistles when I shift the detector, if I try to tune in Australians. — E. POWELL (Christchurch). ANSWERS: The failure to log the Australians is due in all probability to the very adverse atmospheric conditions at the present time (see notes by "Switch"). Provided the filament circuit is broken by a rheostat or switch battéries will not run down if not disconnected. You are wise in using a C battery; it adds materially to the quality of the music. It appears that your coil is too long for 2YA. Try taking off a few turns. This should bring 2YA in at a position other than O and with added strength. The alterations in dial reading may be due to a new valve, aerial or earth changes, or the dial slipping. Request for Circuits. WONDER if you could supply me. with a few good crystal circuits in the "Radio Record"? I have a crystal set, but do not think it is a good one. I wish to compliment you on the way you set about giving crystal owners information in your special "Crystal Corner" in the "Record."K. A. DIXON (Paekakariki). ANSWER: In essense there is no difference in erystal circuits. Adaptations are made merely to satisfy some particular requirement. In volume IT, No. 24, a few of these were discussed. Other adaptations will be given from time to time. Reception in Paekakariki. A FTER following your instructions "" as far as possible I still find no results. My apparatus is now as follows: Aerial, height about ‘20ft. mast end and 11ft. high lead-in end. The length is now just on a 100ft. I am using two insulators each end. The aerial runs paralle] to the beach, which is north and south. Is this right? The lead-in is ut the south end. Does this make’ .ny difference? arth. a kerosene tin filled witb water, buried just a little below the surface of the sand, with a wire con-

Se nected to the top of the tin, and straight in through window to set. I also tried varying the tapping. I wish to make the crystal and valve, but do not want to until I know that I will be able to use it. Thanking you for vour information in the last number of the "Radio Reeord" and hoping that this time I will be satisfied.-K. A. DIXON (Paekakaviki). ANSWER: The aerial could yet be raised several feet. ‘ay, until 30ft. above the ground, while the earth should be sunk well below the sand. Owing to the sandy nature of the soil there may be a difficulty in getting a good ground connection. This may possibly prevent 2YA being heard in Paekakariki. Then there is the shielding effect of the hills to con‘end with. With the crystal and valve. however. the cuse would be different. Tf this were carefully constructed — there should be no difficulty in putting 2YA on the speaker.