New Britain herald., 1922-12-26
IMPORTANT DEVELOPMENT MADE IN
 RADIO DESIGNS AND MAKES IN 1922
rupted continuous wave.
 Continuous Waves,

rupted continuous wave.
 Continuous Waves.
 new tube attachment for eon-
 verting spark trahsmitters into
 vacuum tube continuous wave trans
 mitters, makes It possible for own
 CTS of spark sets to realize the ad-
 Vantages Of continuous wave trans-
 mission at a minimum cost. It has
 an output in the antenna of approxi-
 nately # XIV continuous wave and
 waye-length range Of from 2,O00 to 2'4oo meters. It utilizes the pow CT equipment and high potential transformer of the spark transmitter and includes necessary switching ap- paratus SO that communication can be transferred from the spark set to the tube attachment
 This equipment makes 1t possible not only to carry on communication with stations now listening-in on 2'2oo meters but to carry on com munication over much greater ranges With q XIV spark transmitter. During antual service tests conducted with one of these thansmittcrs. range of l,500 miles daylight. over water, was realized
 An aircraft transmitfer was con- atructed for telegraph communication only with | continuous wave output Tn the antenna of 300 watts. Provi- sion was also made for interrupted continuous wave telegraphy. The transmitter was designed to operate rom a double current stream line generator driven by an automatic speed regulating propeller.
 TWO telegraph transmitters having | outputs of ? and XIV respectively | nto the antenna, were produced for installation in Mexico. They are the lrst sets to include the method of construction which has now been ldopted as standard for medium DOW 1T tube transmitters, and are radi- 'ai departure from vacuum tube ransmtters previously built.
 Each equipment includes keno- ron rectifier which supplies the neces- ary high voltage direct current for he plate supply of the oscillator unit nd so-called l''tank circuit" by means of which the transmitted wave ength is kept particularly constant ma free from undesirable harmonics.
 Parts for Navy.
 A number of telephone and tele- !, raph transmitters were built for i'm tailation on submarines of the U. S. avy, which include many novel fea- E tres of construction and operation. z hey are designed for transmitting f lther on the fiat top antenna or f 'op and include a break-in system T hereby the operator can listen-in be- Veen dots and dashes of the trans fitted message; they are available for lree methods of communications and a ave an output of 600 meters con- ', nuous wave in the antenna. The c 'mplete equipment was extremely re- f ricted in dimensions on account of le service for which it was built. n New apparatus designed and manu- i'm ctured for use with 200KW Alexan- N erson alternator equipments consist it, of antenna turning inductances, re- a otely controlled antenna wave fl lange switches and remotely con- oiled antenna variometers. f, ollc OI the dnt6nnd tuning 1n- d lctances designed for outdoor serv- It, e installed at Radio Central station, f, IS coil composed of ten vertical pports on S2 inch diameter centers se lese supports are of porcelain tubing te
 3h inch outside diameter and are f, i'd semi-rigidly by copper rings on m e inside of the vertical tubes. tr Attached to each of the ten vertical n; pports are IA spacing blocks which e so designed as to provide a maxi fl lm surface-creeping-d distance be- ci cen turns. n The conductor which is wound in p ooves of the spacing blocks is of e, 6 strands of ten mil diameter cop fir r wires, each strand insulated with la amel. Vanished cambric and 'ated braid on the outside provide fir 'ulation and protect the conductor d, 'm the weather The total induc- a, ice is 19 millihenries. in Ten of these coils were furnished W th two 200 XIV alternator equip ta nts for the new radio station near ti,