- Email: [email protected]
Gold coated alumina or beryllia
160
CURRENT TOPICS
cessfully used as a timer-programmer in all of the TIROS Weather Satellites. There is no special setup required for the Photo-Incremag since it has its own optical system, lamps and power Offering a high degree of supply. flexibility, it comes with plug-in cables for photo transistor input and lamp power, and with an auxiliary output from the counter for control purposes. The Photo-Incremag can be furnished for panel mounting or as a portable unit which measures only 7 in. wide, 31 in. high and 7 in. deep. It weighs 4 lb. including optical accessories and operates on 110 volts a.c., 60-cycle current. Maximum input frequency is 50,000 pps. and the standard model has a temperature range of 0” C. to +50” C. A focusing lens and light source are used for the standard optical system and other arrangements can be incorporated to meet special requirements. Normally open or normally closed switching arrangements can be furnished.
AutomaticRadio-Telephone Terminal.-A new automatic radic-tele-
phone terminal for interconnection of a radio communications station to a two-wire telephone line has been introduced by the Communications and Weapons Division of Philco Corporation. The Philco Model RTT-1000 Radio Telephone Terminal provides termination of a four-wire radio circuit into a two-wire telephone line or carrier channel. It automatically controls the transmitter-receiver without requiring d.c. control circuits or transmission of signaling tones enabling “hands-free” remote control of,a radio station from a Both input conventional telephone. and output audio levels are automatically regulated.
[J.F.I.
The all solid state RTT-1000 terminal occupies only 7 in. of rack space and is operable from a 48-volt battery or may be used with an external power supply. Principal applications are in land, marine and air mobile and fixed communications systems. Vibration
Exciter
Systems.-A
new series of vibration exciter systems that offers complete facilities for sinusoidal, discrete-frequency or randomfrequency testing of components, modules, and subassemblies has been introduced by the Industrial Products Division of International Telephone and Telegraph Cprporation. The new equipment, designated as the 3200-Series Vibration Exciter Systems, features a 250-force-pound vibration exciter, model ST-310, that utilizes air bearings to eliminate the conventional flexures and their disadvantages. Thus distortion and crosstalk are almost completely eliminated throughout the normal operating frequency Because the first major axial range. resonance occurs at well over 6 kilocycles, random-frequency testing can be accomplished to 3 kilocycles without complex and expensive equalization networks and filters. The 3200 Series has a flexible driving-system package available in models to two-, three-, and four-bay allow inclusion of such accessory instrumentation as the user may require. The simplest 3200-Series system includes a 2-kilovolt amplifier, an aircontrol system, a driving sinusoidal oscillator, and a readout device. Other accessories are automatic sweep oscillators with servocontrol of table motion, random-noise sources, oscilloscopes, tape decks, and recorders. Gold lia.-Gold
Coated Alumina or Berylcoated high alumina or
CURRENT TOPICS beryllia parts for use in devices requiring a ceramic bond are now being offered by Alloys Unlimited, Inc., of Long Island City, N. Y. Made possible by a new technique called the “Gold Kote” process, the new parts can be supplied as flat squares as large as 2 x 6 in. or as disks in diameters as small as 0.050 in. Special shapes such as tubes, notched parts and recessed parts can also be supplied. All parts can be coated with gold on one or both sides in thicknesses ranging from ?/i to 2 mils according to specifications. The “Gold Kote” can be supplied with a number of different alloy compositions to specific temperature requirements. Using a similar technique, other alloys can also be applied to these ceramic parts with geometric configurations that are favorable. All of these alloys can be appropriately doped p or n type when necessary. Alloys Unlimited’s “Gold Kote” parts have been successfully used in TO-18 and TO-5 headers, ceramic modules, and other specialized applications for experimental devices. Sample quantities can be produced for evaluation
Tantalum-Nitride Technique Improves Resistors.-By sputtering tantalum films in a partial nitrogen atmosphere, Bell Telephone Laboratories has obtained improved thin-film resistors. The tantalum-nitride technique provides resistors with a stability and reliability formerly available only in the larger and more expensive hermetically-sealed devices. In “sputtering, ” ionized gas molecules bombard a cathode of a refractory metal such as tantalum, dislodging its atoms which then redeposit on nearby surfaces. Very precise miniature resistors can be produced on glass or ce-
ramic bases by this technique when used in conjunction with a photolitho graphic etching process. This process leads to resistors as narrow as 2 mil, as close as 2 mil apart, producing high resistance in a small area. Heretofore, tantalum devices have been sputtered in an atmosphere of inert gas such as argon. Traces of certain impurities, like oxygen and water vapor, usually appear in these tantalum films, resulting in resistors with relatively wide variances in resistivity and temperature coefficient. Small amounts of nitrogen (1 to 10 per cent by pressure) added to the argon tend to override the accidental impurities, resulting in resistors with much narrower spreads in resistivity andtemperature coefficient. In addition to being more stable over wide temperature ranges than their predecessors, tantalum-nitride resistors are more stable over a long period of time. Ordinary sputtered-tantalum resistors, when subjected to a load test for a thousand hours, show changes in resistance of one per cent or more. Tantalum-nitride resistors of the same design, tested under similar conditions. vary less than one-tenth of one per cent. Like ordinary -sputtered-tantalum resistors, the tantalum-nitride devices can be protected with an oxide film, and indeed, it is the “anodizing” of a layer of tantalum-oxide that permits the close tolerances to which sputtered devices can be “trimmed.” The anodizing technique produces resistors within one-tenth of one per cent of their nominal resistance. Because of their minuteness, the way they are constructed, and their reliability, tantalum-nitride resistors will be particularly suitable for use in integrated circuits. Typical applications would be in logic modules in certain types of switching systems, or in certain types of transmission networks.
CURRENT TOPICS
cessfully used as a timer-programmer in all of the TIROS Weather Satellites. There is no special setup required for the Photo-Incremag since it has its own optical system, lamps and power Offering a high degree of supply. flexibility, it comes with plug-in cables for photo transistor input and lamp power, and with an auxiliary output from the counter for control purposes. The Photo-Incremag can be furnished for panel mounting or as a portable unit which measures only 7 in. wide, 31 in. high and 7 in. deep. It weighs 4 lb. including optical accessories and operates on 110 volts a.c., 60-cycle current. Maximum input frequency is 50,000 pps. and the standard model has a temperature range of 0” C. to +50” C. A focusing lens and light source are used for the standard optical system and other arrangements can be incorporated to meet special requirements. Normally open or normally closed switching arrangements can be furnished.
AutomaticRadio-Telephone Terminal.-A new automatic radic-tele-
phone terminal for interconnection of a radio communications station to a two-wire telephone line has been introduced by the Communications and Weapons Division of Philco Corporation. The Philco Model RTT-1000 Radio Telephone Terminal provides termination of a four-wire radio circuit into a two-wire telephone line or carrier channel. It automatically controls the transmitter-receiver without requiring d.c. control circuits or transmission of signaling tones enabling “hands-free” remote control of,a radio station from a Both input conventional telephone. and output audio levels are automatically regulated.
[J.F.I.
The all solid state RTT-1000 terminal occupies only 7 in. of rack space and is operable from a 48-volt battery or may be used with an external power supply. Principal applications are in land, marine and air mobile and fixed communications systems. Vibration
Exciter
Systems.-A
new series of vibration exciter systems that offers complete facilities for sinusoidal, discrete-frequency or randomfrequency testing of components, modules, and subassemblies has been introduced by the Industrial Products Division of International Telephone and Telegraph Cprporation. The new equipment, designated as the 3200-Series Vibration Exciter Systems, features a 250-force-pound vibration exciter, model ST-310, that utilizes air bearings to eliminate the conventional flexures and their disadvantages. Thus distortion and crosstalk are almost completely eliminated throughout the normal operating frequency Because the first major axial range. resonance occurs at well over 6 kilocycles, random-frequency testing can be accomplished to 3 kilocycles without complex and expensive equalization networks and filters. The 3200 Series has a flexible driving-system package available in models to two-, three-, and four-bay allow inclusion of such accessory instrumentation as the user may require. The simplest 3200-Series system includes a 2-kilovolt amplifier, an aircontrol system, a driving sinusoidal oscillator, and a readout device. Other accessories are automatic sweep oscillators with servocontrol of table motion, random-noise sources, oscilloscopes, tape decks, and recorders. Gold lia.-Gold
Coated Alumina or Berylcoated high alumina or
CURRENT TOPICS beryllia parts for use in devices requiring a ceramic bond are now being offered by Alloys Unlimited, Inc., of Long Island City, N. Y. Made possible by a new technique called the “Gold Kote” process, the new parts can be supplied as flat squares as large as 2 x 6 in. or as disks in diameters as small as 0.050 in. Special shapes such as tubes, notched parts and recessed parts can also be supplied. All parts can be coated with gold on one or both sides in thicknesses ranging from ?/i to 2 mils according to specifications. The “Gold Kote” can be supplied with a number of different alloy compositions to specific temperature requirements. Using a similar technique, other alloys can also be applied to these ceramic parts with geometric configurations that are favorable. All of these alloys can be appropriately doped p or n type when necessary. Alloys Unlimited’s “Gold Kote” parts have been successfully used in TO-18 and TO-5 headers, ceramic modules, and other specialized applications for experimental devices. Sample quantities can be produced for evaluation
Tantalum-Nitride Technique Improves Resistors.-By sputtering tantalum films in a partial nitrogen atmosphere, Bell Telephone Laboratories has obtained improved thin-film resistors. The tantalum-nitride technique provides resistors with a stability and reliability formerly available only in the larger and more expensive hermetically-sealed devices. In “sputtering, ” ionized gas molecules bombard a cathode of a refractory metal such as tantalum, dislodging its atoms which then redeposit on nearby surfaces. Very precise miniature resistors can be produced on glass or ce-
ramic bases by this technique when used in conjunction with a photolitho graphic etching process. This process leads to resistors as narrow as 2 mil, as close as 2 mil apart, producing high resistance in a small area. Heretofore, tantalum devices have been sputtered in an atmosphere of inert gas such as argon. Traces of certain impurities, like oxygen and water vapor, usually appear in these tantalum films, resulting in resistors with relatively wide variances in resistivity and temperature coefficient. Small amounts of nitrogen (1 to 10 per cent by pressure) added to the argon tend to override the accidental impurities, resulting in resistors with much narrower spreads in resistivity andtemperature coefficient. In addition to being more stable over wide temperature ranges than their predecessors, tantalum-nitride resistors are more stable over a long period of time. Ordinary sputtered-tantalum resistors, when subjected to a load test for a thousand hours, show changes in resistance of one per cent or more. Tantalum-nitride resistors of the same design, tested under similar conditions. vary less than one-tenth of one per cent. Like ordinary -sputtered-tantalum resistors, the tantalum-nitride devices can be protected with an oxide film, and indeed, it is the “anodizing” of a layer of tantalum-oxide that permits the close tolerances to which sputtered devices can be “trimmed.” The anodizing technique produces resistors within one-tenth of one per cent of their nominal resistance. Because of their minuteness, the way they are constructed, and their reliability, tantalum-nitride resistors will be particularly suitable for use in integrated circuits. Typical applications would be in logic modules in certain types of switching systems, or in certain types of transmission networks.