Development of Electronic Receiving Switches for the 225 to 390 Megacycle Frequency Range
Abstract
On board Navy ships many antennas must be located in places where the resulting field intensity patterns do not give adequate coverage in all directions. A system has been devised using two antennas in parallel and switching the receiver alternately from one antenna to the other at a super-audible rate; this giving an averaging effect of the patterns from the two antennas. This report describes the development of and results obtained from electronic switches for a receiving system, and it gives a discussion of the interfering harmonics produced. The frequency range covered was 225 to 390 megacycles and a switching rate of 20 kilocycles was used. The results obtained from the receiving switches were moderately good, switching of the order of 18 decibels being obtained with a maximum insertion loss of approximately 11/2 decibels. The switching action was accomplished through the use of a vacuum tube across a resonant tank. The plate resistance of the tube, varying with the dc current through the tube, was used to control the r-f transmission through this tank.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 02, 1946
- Accession Number
- AD1195373
Entities
People
- M. Heusinkveld
Organizations
- United States Naval Research Laboratory