Bits

A Comprehensive Guide to Artificial Intelligence And Expert Systems, written by R. Levine, D. Drang and B. Edelson, provides a solid grasp of Al terminology, clear diagrams and hands-on programming examples. Each program is written in BASIC and can be implemented on a personal computer. Primary techniques used to create Al programs, types of expert systems that can be designed and implemented by the computer user and sophisticated programming applications are examined. An extensive section of...

Error Detection and Correction Codes

1296 Mhz Transmitter Circuit Diagrams

By Sam Cowan, W0OAJ RR 1, Box 145 Eimwood, NE 68349 Errors Computers are not supposed to make errors, but they happen anyway. Any ham who has worked with 64 kbytes of dynamic RAM or another large data storage device knows that error detection and correction are a fact of life. If the error is not detected, the false data can result in serious consequences. Several methods to detect and correct errors have been devised. One of the first methods used was to transmit the data twice. After...

YIG Filters and Oscillators

By William Richardson, W3IMG 3333 Harness Creek Rd Annapolis, MD 21403 The YIG device is commonly used as a filter or oscillator in electronic equipment that operates in a frequency range from 0.5 to 40 GHz. The device possesses remarkable characteristics It has a wide frequency coverage from 2 1 to 18 1, offers electronic tuning with linearity of 0.2 or better, has a Q of 1000 or more and its size is typically 2x2x2 inches. One drawback of the YIG device is its high cost in the 500 to 2000...

WATT with elhg WATT with dnatv

All prices Include UPS surface shipping In cont. USA Sensitive UHF GaAsfet tuneable downconverter for receiving Two frequency 1 watt p.e.p. transmitter. 1 crystal included Crystal locked 4.5 mHz broadcast standard sound subcarrier 10 pin VHS color camera and RCA phono jack video inputs PTL push to look T R switching Transmit video monitor outputs to camera and phono jack ' Small attractive shielded cabinet - 7 x 7 x 2.5 Requires 13.8vdc 500 ma. color camera current Just plug in your camera or...

VHF Technology

By Geoff Krauss, WA2GFP 16 Riviera Drive Latham, NY 12110 New transistors with appealing performance characteristics continue to come to my attention. Some of the components remain in a high price range, but it is beneficial to consider what contributions they can add to a VHF project. M A-COM PHI, Inc 1742 Crenshaw Blvd, Torrance, CA 90501 manufactures a line of 1200-1400 MHz devices the PH1214-XX series. XX is 8, 30 or 60 W of power output with 9, 8 or 7 dB of gain, respectively. These...