QEX

Parts for the "SSB Exciter" (Anderson): 12, Dec 91 Pervasive Technology (Leggett): 13, Jan 92 PK-232 Telemetry Reception Modification (Moroni): 3, Sep 91

QEX— still an experimenters' exchange? (Lau): 16, May 91

Signetics NE602 as a Test Instrument (Bowman):

11, Aug 91 Some Feedback (Duff): 15, May 91 Some Interesting Power Supply Chips (Hornbostel): 3, Sep 91

Switching Power Supplies (Anderson): 9, Jul 91 "Switching Power Supplies" Addition (Smith): 12, Dec 91 A VHF Crystal-Controlled Oscillator with Negative Ground

(Bowman): 10, Aug 91 A VHF Crystal-Controlled Oscillator with Positive Ground

(Bowman):10, Aug 91 Whither Experimentation? (Isard): 14, Jan 92 900/901 Series (Wolos): 8, Jul 91 38,400 bit/s Packet Radio Comments (Papson): 3, Sep 91

Corrigendum

HF Frequency Synthesizer...Easier Than Ever (Boiliot,

Jan 91): 22, Jun 91 Low-Power Portable Packet Terminal (Avritch, Jan 91): 22,Jun 91

Measuring the Mass of the Earth—The Ultimate Moonbounce Experiment (Shuch Sep 91): 14, Jan 92 Switching Power Supplies for High Voltage (Hulick, Feb 91): 21, Aug 91; 15 Nov 91

Editorials (Rinaldo)

AMSAT-UK Colloquium—The Sixth: Sep 91 Countdown to WARC-92: 2, Apr 91 Digital Communications and Future Systems Committees: 2, Feb 92

HF Packet Radio R&D Project Update: 2, Mar 91 I Know You're Out There—I Can Hear You ACKing

(KE3Z): 2, Dec 91 Pervasive Technology: 2, Jun 91 Power Control in System Design: 2, Oct 91 Public Service (KE3Z): 2, Jan 92 Request for Comments: 2, May 91 Spotlight on the 13-cm Band: 2, Jul 91 You Can't Win if You Don't Play: 2, Aug 91 10th CNC Notables: 2, Nov 91

Educational

ARRL 10th Computer Networking Conference: 17, Jul 91

Call for Papers for AMSAT-NA Technical Symposium and

Educational Workshop: 7, Sep 91 Call for Papers—25th Central States VHF Society

Conference: 17, May 91 Conference Proceedings—AMSAT/NA Ninth Space Symposium and AMSAT/ARRL Educational Workshop 17, Nov 91 High Schools and Amateur Radio Team Up to Support

VLF Shuttle Research: 21, Dec 91 International Phase HID Satellite Program: 21, Aug 91 Microwave Update 1991: 17, May 91; 17, Jul 91; 21,

Aug 91; 17, Oct 91 SAREX Update:6, Apr 91 Software Service: 21, Apr 91

6th Annual Satellite Colloquium: 6, Mar 91; 16, Jun 91 7th Annual Eastern VHF/UHF/SHF Conference: 21, Apr 91

25th Central States VHF Society Conference: 17, Jul 91 Miscellaneous

An Audio CW Notch Filter for Home Brewing (Mita): 4, Sep 91

Automated SAREX Communication (Smitt): 3, Apr 91 A Different Weave of SSB Exciter (Anderson): 3, Aug 91 EA-88 IBM PC Radio Interface (Miletic): 13, Jun 91 Index to QEX March 1991 to February 1992 (Volumes

109-120): 18, Feb 92 Maxwell Without Tears—A Fresh Look at His Infamous

Equations (Shuch): 6, Jan 92 Measuring the Mass of the Earth—The Ultimate Moonbounce Experiment (Shuch): 8, Sep 91; Corrigendum: 14, Jan 92 Microwave Update '91: 11, Jan 92 The OZ1HWO 144-148 MHz Pocket FM Receiver

(Tolstrup): 7, Apr 91 Power Supply for GaAs FET Amplifier (Lau): 10, Mar 91 The Series Regulator Power Supply—A Closer Look

(Sabin): 3, May 91 Simple Crystal Filters (Parrot): 10, May 91

New Products

Computer Program Designs, Simulates, and Optimizes High-Efficiency (Class E) RF Power Amplifiers (HEP-APLUS): 21, Apr 91 Logic Tutor: 21, Apr 91

Specialized Communications Techniques

AMC—The AMTOR Controller (Bingemer): 3, Feb 92 Direct Digital Synthesis—What Is It and How Can I Use

It? (Saul): 7, Mar 91 A Microcontroller Based Multimode Reader (Haynal): 3,Jun 91

An Optical, Through-the-Air, Digital Communication

Modem Part 1 of2(Foltzer): 3, Nov 91 An Optical, Through-the-Air, Digital Communication

Modem Part 2 of 2 (Foltzer): 3, Dec 91 A New DSP for Packet (Albert): 3, Jan 92

PACTOR—Radioteletype with Memory ARQ and Data

Compression (Helfert/Strate): 3, Oct 91 PSK Anyone? (Reed): 3, Jul 91 PTC—The PACTOR Controller (Clas/Mack): 7, Oct 91 TCP/IP Command Set Reference (Wade): 3, Mar 91 Voice Mailbox at the UHF/VHF Conference in Weinheim (cq-DL): 8, Dec 91

VHF+ Technology (Krauss)

Changing the Contest Rules, Revisited: 13, Apr 91 High-Temperature Superconductors (HTS): 14, Apr 91 Mid-Year Notes: 11, Jul 91 Miscellanous thoughts: 13, Aug 91 More Thoughts on 135 cm: 12, Oct 91 Remember—No use of 220-222 MHz: 13, Aug 91 Rotating Towers for VHF+ Antennas: 12, Oct 91 Year-End Housecleaning: 16, Jan 92

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