QEX

RFC Is 5 turns, no. 24 wire, 0.125 Inch ID spaced 1 wire diameter. Vcc should be adjusted for the desired performance, then the bias resister can be optimized for a particular power supply voltage. external filters must be used to establish isolation between the LO, RF and IF ports. Typically a low-pass filter is used on the IF port to keep the RF and LO levels below some acceptable level. Remember that the mixer also acts as an amplifier and can amplify the LO drive...

Reader Survey

I have received several more letters, and they continue to say the same thing most of you build a variety of projects, or, like me, you go through phases. Several more requests were made for microwave components, so I'll begin to dig a bit deeper in that area. This month begins again with a description of a small-quantity hardware vendor. Jameco, like Digi-Key described in April, has been serving the electronic hobbyist for many years and has built a solid reputation for quality parts, shipped...

J

This book can be used alone or to complement The ARRL Handbook and belongs in every technical library. Here's a brief summary and chapter lineup Symbols, Conversion Factors and Tables Components and Materials includes color codes, standard values, toroid selection charts Inductors and Transformers Time and Frequency Measurement Networks and Filters covers attenuators and matching network design information Digital Basics is 88 pages of logic, TTL Circuits, specific device...

Impedance Bridge

Hanning, KD4FY Bridge the gap between traditional mechanical RF impedance bridge circuits and varactor tuning diodes, in a new easy-to-build direct-reading RF. PRACTICAL SPREAD-SPECTRUM CLOCK RECOVERY WITH THE SYNCHRONOUS - 7 The Synchronous Oscillator SO , an interesting, simple circuit which can be used for clock recovery. This article describes its principle, practicality, ease of use and performance. NONLINEAR APPLICATIONS USING THE AVANTEK MMICs- 10 By Al Ward, WBLUA and Marcus...

About The Cover

Drawing of what you would see on an oscilloscope when looking at N4ICK's clock-recovery scheme. Synchronous oscillator output is top trace, sync input pulses with 6 missing are at the bottom. E liv jm k bwEjnUA. Mjl- k___J 3-nfc THE AMERICAN RADIO J RELAY LEAGUE, INC W The American Radio Relay League, Inc, is a v noncommercial association of radio amateurs, argariznd for the promotion of interest in Amateur Rtdio communication and experimentation, for the establishment of networks to provide...

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Synchronous Oscillator Schematic

Fig 4 Schematic of the equipment used for test purposes. adjustable RF coil catalog no. 9055, 60-120 fjH C1 5-50 pF adjustable Rl 100 0 adj potentiometer All capacitors are mica unless otherwise noted. Fig 4 Schematic of the equipment used for test purposes. typical synchronization curves have been published in reference 3. It should be kept in mind that the tracking range depends on the level of the synchronization signal at the input, and on the Q of the collector tank circuit. Incidentally,...