Experimental Methods in RF Design

A-Lin

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Experimental Methods in RF Design

1 A, M$ s$ s) x1 Y( r“Experimenting” for the radio amateur is that activity that occurs when a newidea is committed to practice. This usually includes building or“homebrewing” some circuitry, but that is only part of the process. It alsoincludes the planning, analysis, measurement, evaluation and packaging thataccompanies the building. The art of this collected activity is what we calldesign.Chapter 1, Getting Started
1.1—Experimentation, “Homebrewing,” and the Pursuit of the New: This is abrief philosophical comment regarding our views on the subject at hand.
0 @. N: ?9 v1 @" ?1.2—Getting Started—Routes for the Beginning Experimenter: We begin witha discussion of construction methods, which emphasize breadboarding, or oneof-a-kind building.
# e- S4 G9 ?! h5 F. K. L) Q1.3—Some Guidelines for the Experimenter: A collection of hints and pitfallsrelated to success in experimenting is presented, observations that we have(sometimes painfully) made.
& |8 j2 {+ M: a+ t, X8 q2 T1 m0 m/ `1.4—Block Diagrams: This section briefly describes the block diagrams usedthrough the book for the systems we build.
1.5—An IC Based Direct Conversion Receiver: This simple receiver is awonderful first project, offering good performance on any of several bands.
1.6—A Regenerative Receiver: Many readers will certainly ask “why wouldanyone ever build a “regen” receiver in this modern age. There are many answers, but the strongest is that the mere act of using such equipment is anexperimental experience. The philosophy of adapting the design to fitavailable parts is in keeping with the rest of the book.
( Y; ?, G: a8 N( `  [% Q1.7—An Audio Amplifier with Discrete Transistors: This is a simple designthat folks can build to drive a small speaker when they don’t have an audio IC available.
1.8—A Direct Conversion Receiver Using a Discrete Component Product Detector: This design shows a simple DC receiver using a differential amplifier as the detector. The local oscillator is varactor diode tuned and the model shown uses surface mount technology (SMT.)
* G9 r( g/ [7 e1 i1.9—Power Supplies: This section address the need of powering theequipment and test equipment used by the beginning experimenter. Some simple supply designs are offered that use readily available regulators.
1.10—RF Power Measurements: We will shortly be presenting a transmitter, so we need a way to measure radio frequency power. Power meters using a termination and a diode peak detector are offered. Some dual designs are suggested, allowing measurement over a wider range. An RF probe is also presented that can be used with a traditional VTVM or FET equivalent.
1.11—A First Transmitter: This section follows the design of a simple
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小金

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