A PHASE-AND-GAIN-MATCHED GAIN CONTROL FOR MULTI-CHANNEL DIRECTION FINDING RECEIVERS
Abstract
A method is discussed for linear operations of pentagrid frequency converter tubes. The theoretical treatment indicates that this type of converter operation can be incorporated in an matched gain-control system for a phase-and- gain-matched multichannel receiver, and that linear operation of the converter tube will reduce the problem of spurious responses in single and double super- heterodyne radio receivers. Reducing the harmonic output of the oscillator or reducing the level of the oscillator signal applied to the oscillator grid accomplishes little towards reducing harmonic responses with conventional class C converter operation whereas it may accomplish a large reduction for linear operation. Linear or near linear operation of frequency converter stages can be used with variations in local oscillator amplitude to produce a satisfactory matched-gain control for a phase-and gain-matched DF receiver. This gain control can be made to operate over a 60-db dynamic range fro a single converter tube, with lesss than 1 deg bearing error, and requires no matching of components other than a noncritical selection of tubes for optimum results. It is suitable for utilization with an AGC system.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1953
- Accession Number
- AD0011624
Entities
People
- T. R. O'meara
Organizations
- University of Illinois Urbana–Champaign