This chapter describes transmitting tube circuits because tubes still provide the most practical and economical means of achieving the high performance necessary for multichannel (ISB) transmission at power levels above 1 kW (at present). The opening section provides a good discussion of IMD. This chapter will then show how to choose and compute tube-operating conditions. Tank circuit and coupling network requirements will be discussed, and neutralization and stabilization circuits will be shown. Finally, RF feedback circuits will be described as an effective means of improving IMD performance.

Chapter Contents:

• 14.1 Intermodulation Distortion
• 14.2 Nature of an SSB Wave
• 14.3 Classes of Operation
• 14.4 The Ideal Tube Transfer Curve
• 14.5 RF Power Output and IMD Ratings
• 14.6 Analytical Methods of Estimating Tube Operating Conditions
• 14.7 Tank Circuits and Impedance-Matching Networks
• 14.8 Neutralization and Stabilization
• 14.9 RF Feedback
• References

Inspec keywords: power amplifiers; feedback amplifiers

Other keywords: coupling network requirements; neutralization circuits; RF feedback circuits; tube-operating conditions; tube circuits; ISB transmission; tank circuit; IMD performance improvement; stabilization circuits; multichannel transmission; high-power linear amplifiers

Subjects: Amplifiers