|Name of Station|| Call|
|Name of Station|
|NAB||Portland, Me.||NAQ||Jupiter, Fla.|
|NAC||Portsmouth, N. H.||NAR||Key West, Fla.|
|NAD||Boston, Mass.||NAS||Pensacola, Fla.|
|NAE||Cape Cod, Mass.||NAT||New Orleans, La.|
|NLA||Nantucket Shoals Light Ship.||NAU||San Juan, P. R.|
|NAF||Newport, R. I.||NAW||Guantanamo, Cuba.|
|NAG||Fire Island, N. Y.||NAX||Colon. Isthmian Canal Zone.|
|NAH||New York, N. Y.||NAY||Porto Bello, Panama.|
TYPE RS-100 JEWELERS TIME RECEIVER
The set consists of a bakelite panel on which is mounted one of our type R-100 tube receptacles, type CV-500 variable 90° air condenser, one F-200 filament rheostat, G-100 grid leak, ULC-200 single cell mounting, a Honeycomb Coil of the proper size and binding posts for connection to the aerial and ground, storage battery for lighting the filament, telephone receivers, or a type P-200 two-step Amplifier and loud speaking horn. A 40 volt "B" battery consisting of two of our standard 20 volt units with their remarkably long life is included, so that when once set up, the receiver should require no attention for at least six months.
The whole outfit is enclosed in an oak cabinet with our handsome "Early English finish." Its small size of 9" X 91/8" X 73/4" takes up a minimum of counter space.
As the set is equipped with the audion type of detector, it is of the utmost sensitiveness and no difficulty should be experienced in receiving time signals from Arlington on a fair sized aerial when 1,000 miles away. An aerial consisting of a single wire 40 to 60 feet high and 150 to 200 feet in length depending upon the location of the set should be sufficient for such reception.
We believe the jeweler should welcome this set warmly, due principally to its simplicity which assures him of constant reception of the time signals after he has given up the expensive time service lease, upon which he is at present dependent for the setting of his clocks. The de Forest Jeweler's Receiving Set has the added advantage over the old style time leases, that absolutely the actual time may be obtained with it, whereas telegraph time signals are apt to be inaccurate, owing to mechanical lag in the apparatus, and personal errors in the setting of the master clocks.
The metal parts of the type RS-100 Receiver are of brass with a nickel polish. Against the black bakelite background, a decidedly pleasing appearance is provided which is worthy of a place on the counter of the most up-to-date and enterprising jewelry store. When the set is used in this way, from an advertising point of view, it is decidedly worth while. A greater and far better advertisement is obtained, however when our type P-200 two-step amplifier and loud speaking horn receiver is added to the set, so that time signals as well as signals from radio telegraph and telephone stations may be heard all over the store. An object of such general interest, it has been found, causes much favorable comment on the part of the public with the result that sales are increased and the store gains a reputation of being the most enterprising and up-to-date.
No. RS-100 Jewelers' Time Receiver Without Tube and "A" Battery, but With "B" Battery and Coil . . . . $30.00
TYPE P-200 TWO-STEP AMPLIFIER
This is the very latest in amplifier design and will be found to be very different and so much more efficient than our older types of amplifiers that there is no comparison. The most notable feature of the new design is its compactness. The small case contains not only the amplifying coils, telephone jacks, amplifier tube receptacles, and filament resistances, but also a "B" battery of 40 volts which is sufficient to give amplifications up to 10,000 times. All these pieces of apparatus are mounted on the panel and come out with it. The panel is easily removable making all parts most accessible and the replacing of the "B" batteries but a moment's work.
Unit batteries of 20 volts each, cast in one block, are used. Those come provided with two leads which are connected to the circuit by means of two connecting clips. It is therefore unnecessary to use a soldering iron to connect together a number of cells. Moreover, the new type of battery is the most efficient and practical battery made. It has a remarkable shelf life and operating life of approximately 2000 hours when used with our type VT 21 tubes in this type of amplifier. Users of amplifiers in the past will appreciate this new development in "B" batteries which has taken place during the war.
The panel is of 3/8" bakelite beautifully engraved. The tube receptacles are nickel plated with a high polish and the knobs and binding posts are of bakelite. These are large in size and are of an expensive and artistic type. The binding posts are provided with slots to hold the wire in place while the head is being screwed down.
The cabinet is of oak with "Early English" Finish. It is strongly built and beautifully polished.
In order to operate the instrument it is only necessary to connect a six volt storage battery to the two binding posts marked "A BATTERY". The source of audio frequency should be connected to the two posts marked "INPUT." If the plug on the telephone cord is then inserted in the jack marked "I TEL", the audio frequency to which the device is connected will be received unamplified. If then the plug is inserted in the jack "II TEL" and the filament rheostat marked "FILAMENT  TUBE I" is adjusted, the audio frequency will be amplified by means of the first step. If a similar operation performed with the rheostat for the second tube after the telephone plug is inserted in the jack marked "III TEL", the full amplifying power of the instrument will be obtained.
Amplifying Tube, with four prong standardized Bayonet Base, each . . . . 7.00
In the up-to-date radio station where amplifiers are employed, the Loud Speaker is fast becoming a necessity, and the use of head receivers is rapidly going out of style, except for the very weakest signals.
We present a loud speaker which, when used in connection with a two-step amplifier, will cause the signals to be heard all over the operating room. Experiments have shown that a loud signal on these receivers can be amplified to such an extent as to be unbearable to the ears when the head is placed within two or three feet of the horn.
For the reception of time signals from Arlington, a loud speaking receiver and two-step amplifier is an addition to the receiving set which is especially more than worth while to those who wish to allow several people to set their watches at the same time. Such an equipment has an exceptional commercial value to the jeweler since the time signals may be heard all over his store, and should produce an excellent advertisement for his business.
The Loud Speaker consists of a special telephone receiver capable of handling fairly large amounts of received current and of an impedance high enough to be inserted directly in the plate circuit of the amplifier or detector. The receiver is equipped with a special shell bearing a threaded portion to which the horn in attached.
No. LS-100 Loud Speaking Receiver, with 20" or 24" bell or cone-shaped horn, as illustrated, six feet cord and plug ceiling or wall type.