New Products (Dec, 1962)

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New Products

FILAMENT CHECKER.

Speedy testing of filaments and heaters in all types of tubes is the function of the Sencore FC123. Nuvistors, novars, compactrons, and 10-pin tubes, as well as all of the more familiar types, can be quickly and easily checked with this device. A pair of test leads is supplied for checking CRT’s, making other continuity tests, and testing neon indicator lamps. The FC123 sells for $3.95. (Sencore, Inc., 426 S. Westgate Dr., Addison, Ill.)

UHF CONVERTER.

Said to offer 50% more picture power than other single-tube UHF converters, the Gavin Model G-2 features a long-life, low-noise Nuvistor circuit. A built-in UHF-VHF coupler allows the use of existing VHF antennas and transmission line. Measuring 8-1/2″ X 3″ x 4″ and weighing 2-3/4 lb., the converter incorporates an isolation transformer for “cold” chassis operation. All UHF channels from 14 to 83 can be tuned with the Model G-2. Price, $24.95. (Gavin Instruments, Inc., Depot Square, Somerville, N. J.)

AUTOMATIC PHONE PATCH.

Any mobile unit in a two-way radio system can now be automatically patched into a telephone with the Model 301 “Patch-a-Call.”

The 301 is a transistorized, voice-operated device, which is physically connected only to the transmitter or transceiver at the base station. The telephone handset is placed in a receptacle on the 301, automatically turning it on; and when the party on the land line speaks, the transmitter is actuated. When no speech is present, the receiver is switched into the circuit. The base station operator can monitor the conversation over an auxiliary speaker. The “Patch-a-Call” is priced at $64.95. (Business Radio, Inc., P.O. Box 5652, Minneapolis, Minn.)

COMPACT WORKBENCH.

Occupying just eight square feet of floor space, the Hirsh all-steel “Work and Hobby Bench” has a 24″ x 48″ high-impact fiber-board work area. A perforated back panel with double-tier tool rack provides storage space for dozens of small hand tools, and there is a 12″ x 20″ storage drawer and a storage shelf as well. The bench is finished in gray enamel. Suggested retail price, $25.00. (S. A. Hirsh Mfg. Co., Skokie, Ill.)

DIGITAL COMPUTER KIT.

Using transistorized “NOR” circuitry, the “NORDAC” is said to be the first fully transistorized digital computer kit. It is the newest addition to the “MINIVAC” line of computer teaching devices. No special electronics skill is needed to assemble the kit, which demonstrates all basic computer operations. An accompanying manual contains over 100 experiments and programs covering the fundamentals of computer technology. Information is fed to the computer through five input switches and results read out by five indicator lamps. Colored patch cords are used for programming the device. Price, $64.95. (Scientific Development Corp., 372 Main St., Water-town, Mass.)

SHORT-WAVE RECEIVER KIT.

The Heathkit HR-20 eight-tube superhet tunes AM and CW as well as SSB signals on any ham band from 80 through 10 meters. A crystal bandpass filter provides sharp selectivity, and a tuned r.f. stage insures better than 1-uv. sensitivity on all bands. Tuning is simplified by a 5-1/2″ slide-rule dial with a 30-to-1 gear ratio, and an easy-to-read S-meter indicates relative signal strength. The 17-lb. receiver operates from a 12-volt car battery using the Heath-kit HP-10 mobile power supply, or from 117 volts using the Heathkit HP-20 a.c. power supply. The HR-20 (without power supply) is priced at $134.50. (Heath Co., Benton Harbor, Mich.)

“EDUCATIONAL” HEADSET.

The Clevite Model ED-300 “educational” headset is designed specifically for language labs and other teaching applications. It can be worn comfortably over glasses and, having only a single cord, is easy to put on and take off. Two types of ear cushions are available: a “do-nut” type (recommended for long listening periods and for maximum elimination of external noise), and a “blanket” type (which prevents direct contact between ear and phone). The cushions are attached by means of a special nylon zipper and can be removed easily. Frequency response of the headset is 50-10,000 cycles; impedance is 50,000 ohms at 1000 cycles. Price, $28.00. (Clevite Electronic Components, 232 Forbes Rd., Bedford, Ohio)

FOUR-BAND RECEIVER.

An amateur communications receiver, the HE-60 features a sensitive superhet circuit and tunes all frequencies from 550 kc. to 30 mc. in four bands. The 4″ speaker is automatically disconnected when a low impedance headset is plugged into the front panel jack. Housed in a 10-11/16″ x 5-5/8″ x 8-1/2″ cabinet and weighing 9 lb., the receiver operates from 105-125 volts, 50/60 cycles. The HE-60 is priced at $39.95 and the headset (ME-42) is $2.35. (Lafayette Radio Electronics Corp., Ill Jericho Turnpike, Syosset, L. I., N. Y.)

6 comments
  1. Hirudinea says: November 21, 20113:10 pm

    Digital Computer Kit for only $65? Neat, but what kind of apps can I get for it?

  2. DrewE says: November 21, 20113:43 pm

    @Hirudinea — Perhaps the most impressive app available is one called “one-bit full adder” which can actually perform mathematical operations. Another impressive one is “five bit flip-flop memory”, which can store and display FIVE different things at once. Finally, “Ring Oscillator” can generate signals that change continually, quite possibly generating an audio-frequency or radio-frequency output signal.

  3. Stephen Edwards says: November 21, 20117:09 pm

    I’m impressed that the phrase “land line” has been around since 1962.

  4. Toronto says: November 21, 20118:02 pm

    Drew/Hiru: Technically, you can do anything with just NOR gates (or just NANDS.) If I recall, the Apollo spacecraft’s computers were single-gate-type, because it was easier to rad-harden them that way.

  5. Charlene says: November 21, 201111:51 pm

    @Stephen Edwards: It dates back to at least 1865, or approximately one hundred years earlier than this. The original meaning was an overland telephone cable, as opposed to an undersea cable.

  6. DrewE says: November 22, 201111:21 am

    Toronto — You’re entirely correct about digital logic and NAND or NOR gates (which are, of course, equivalent to each other if you swap the logical sense of the signals). That said, there are distinct limits on what is possible with ten NOR gates; you’d have to get quite a large number of NORDACs to start to reconstruct the Apollo computer!

    It seems there was a NORDAC II that came later and featured individual circuit modules that could be swapped around. Some of these were apparently more complex than a single gate–possibly containing a flip-flop? http://www.computerhist…

    I wonder what sort of logic family these systems used; my guess would be basic RTL with (discrete) germanium transistors.

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