## Membership

ments for several versions of the Motorola 68040 processor. Other tables include those with connector information for PC edge cards, the SCSI bus interface, the IEEE 488 bus interface and the RS-232 interface.

I found the Electronics Mathematics chapter to be particularly useful. There are reminders of many basic algebra rules, plane and solid geometry formulas and an extensive section on trigonometry. Mathematical Tables and Formulas is another handy chapter. It includes a table of mathematical constants that are sometimes required for calculations, but are difficult to remember, such as the value for e (2.7182818285). The section about decibels gives the important equations along with a useful table of decibel values and power, voltage and current ratios. I'm not sure when I would ever need a table of 2500 five-digit random numbers, but if I ever do, I can find it in the Electronics Pocket Reference!

The Symbols chapter includes a listing of the upper and lower-case characters of the Greek alphabet. There is also an extensive table of electronics schematic-diagram symbols. It is hard to imagine that I will ever need to perform a unit conversion that isn't covered somewhere in the 25 pages of conversion factors. There is a two-page temperature conversion table that I found especially interesting. Read a known value in bold type on this chart. The value to the left is the Celsius equivalent of a Fahrenheit value or the one to the right is the Fahrenheit equivalent of a Celsius temperature. It is a very easy to use chart, with values given for every degree from 0 to 100, and every ten degrees down to -100 and up to 500. (This means the table covers a range between -148° and 932°F or -73.3° to 260°C.)

I believe many amateurs would find the Electronics Pocket Reference to be a valuable addition to their technical library. Although the nearly \$25 price tag may seem high for such a small book, I am sure it will be referenced often. The binding seems to be of good quality, and the paper cover has a plastic lamination to increase its durability. I would have preferred a binding method that would allow the book to lay open on my desk, but that is one of the few complaints I might make about this book. □□

TAPR • 8987-309 E. Tonque Verde Rd #337 Tucson, Az • 85749-9399 • (817) 382-2825 TAPR Is a Non-Proflt Resecrch and Development Corporation

If you've ever used packet radio, then you've already connected to TAPR. Join and become part of the largest packet radio group in the world. TAPR is a non-profit amateur radio organization that develops new communications technology, provides useful/ affordable kits, and promotes the advancement of the amateur art through publications, meetings, and standards. Membership includes asubscriptiontotheT^/^Pac^iSit^/i^wierquarterlynewsletter, which provides up-to-date news and user/technical information. Annual membership US \$15, Canada/Mexico \$18, and outside North America \$25. Contact TAPR for details/brochure on all kits and services. Members receive 10% off kits and publications.

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