Gateway Contributions

Submissions for publication in Gateway are welcome. You may submit material via the US mail or electronically, via CompuServe to user ID 70645,247 or via Internet to rtoAzepa gdc.portal.com. Via telephone, your editor can be reached on evenings and weekends at 203-879-1348 and he can switch a modem on line to receive text at 300, 1200 or 2400 bit s. (Personal messages may be sent to your Gateway editor via packet radio to WA1 LOU N1 DCS or IP address 44.88.0.14.) The deadline for each...

Coming Attractions

(Remember, software upgrades are free ) Commercial inquiries are welcomed. We offer rapid prototyping of custom commercial, civil, and government applications. DSP-12 Multi-mode Communications Controller 595.00 One Megabyte RAM Expansion Option 149.00 Date Time Clock Backup Option 29.00 8-Channel A-To-D Telemetry Experimentation Option 49.00 Wall-Mount Power Supply for DSP-12 (110 19.00 We accept MasterCard & VISA and can ship COD. within the USA. All orders must be paid in US Dollars....

January Qex Advertising Index

L. Grace Cov II Down East Microwave 17 P. C. Electronics 8 Henry Radio Stores 24 Rai Enterprises 17 Jacob Handworker, W1FM 8 Sinclabs Inc 23 Kantronics Cov III Yaesu USA Inc Cov IV THE AMERICAN RADIO RELAY LEAGUE, INC The American Radio Relay Lsagu , Inc, is a noncommercial association of radio amateurs, organized for the promotion ol interest in Amateur Radio communication and experimentation, for the establishmsnt of networks to provide communications in...

Hern

2050 S BUNDYDR LOS ANGELES, CA 90025 (21 3) 820-1 234 Toll free Order number (800) 877-7979 TELEX 67-3625(Henradio) FAX (21 3) 826-7790 If you'd like to run fast packet today, perhaps experiment with faster modes too, yet be compatible with today's 1200 baud system, then install a DataEngine at your station or node. The Kantronic's DataEngine runs 1200, 2400, and 9600 baud packet with matched plug-in modems and appropriate transceivers now. For example, you can install a DE9600 modem in the...

New Software Available

The following new packet radio software has become available recently. Most of the following information comes from CompuServe's HamNet. Additional information is provided, if known. Although, all of the delineated software may be downloaded from HamNet, some of the software may be downloaded from other sources such as other online services, landline and packet radio BBSs. Other software sources are provided, if known. Version 1.3 of G1 YYH's port of KA9Q's TCP IP NOS software for the Amiga...

Wwww

Where the frequency shifts when there is a zero bit in the bit stream. 0 Phase-detector output Operating the phase-locked loop PLL IC in a closed loop configuration, the internal VCO will lock on and follow both the 1200- and 2200-Hz inputs. The phase-detector output is linearly proportional to the difference between the input-signal frequency and the free-running VCO frequency. It is adjusted to make the 1200- and 2200-Hz inputs produce equal outputs of opposite polarity. The output is a...

P C Electronics Visa Mc Ups

2522-Q PAXSON LN, ARCADIA CA 91007 818-4474565 HAMS SHOULD BE SEEN AS WELL AS HEARD for the TVC-4G 70 CM ATV Downconverter to get you started Value plus quality from over 25 years in ATV The sensitive TVC-4G GaAsfet downconverter varicap tunes the whole 420-450 MHz band down to your TV set to channel 2, 3 or 4. Just add a good 70 CM antenna and you are ready to watch the live action. TVC-2G board only is avail, for 49.

Help Wanted Building Backbone

The South Florida DX Association is planning to install a 440-MHz packet radio backbone to accommodate the projected burden that the DX spotting system will create. The Association is seeking advice from those who have already built such a backbone so that they do not have to reinvent the wheel. If you can provide any assistance, please contact Tom Mannix, WA4YLD, at PO Box 6296, Hollywood, FL 33081. What can you do with TCP IP The standard answer says you can do electronic mail with SMTP, file...

Lowpower Portable Packet Terminal

A portable terminal you can build with a handful of components. THE AMTOR MAILBOX STANDARD A PROGRESS-9 This report describes the progress and future expansion of the author's AMTOR Mailbox Standard project which first appeared in the February 1990 issue of QEX. MICROSAT BI MODULATOR INTERFACES WITH ANY VHF TNC------10 Transform normal VHF AFSK output from any unmodified TNC into the Bi format. The assembly is relatively simple, and all parts can be purchased from a...

HF Frequency Synthesizer Easier Than Ever

Digital Frequency Synthesizers Schematic

By Pierre Boillat, HB9AIS 20 Fin de Meyriez CH-3280 Meyriez, Switzerland Translated from the January 1990 issue of old man The first generation of HF equipment featuring digital frequency readout dedicated to Amateur Radio appeared on the market about 25 years ago. This technological development was much appreciated. Try to imagine, or remember, all the care that was needed when only analog displays were used, and when you wanted to make a sked on a specific frequency. It was certainly...

Quick Yagi

2 to 12 elements from 1.5 to 500 MHZ Calculates forward gain, f b ratio, real amp imaginary impedances amp beam width Elevation amp azimuth polar plots in a log or linear scale. CGA amp EGA Metric foot-inch conversions, tapered element compensations amp auto design functions Saves amp retrieves antenna files iequint IBM PC Xf AT or compatible with CGA, EGA or VGA. Available on 5 1 4or3 1 2 dsieliei' Only 30.00 post paid in U.S. amp Canada. Others add 2.00 for postage. Arizona residents add 5...