Investigation of Hum in Model RAB Receiver
Abstract
Inasmuch as the tests demonstrated conclusively that the magnetic coupling between the band pass filter and the A.V.C. leads on the main terminal strip in the IF - AF unit of the receiver can be greatly reduced by the physical reversal of the band pass filter, and electrical reversal of the A.V.C. circuit at the power unit with attendant great improvement in the hum level, in both the broad and sharp positions, it is recommended that the changes recommended by the RCA Victor Company be made in the RAB receiving equipment now in the field and which are unsatisfactory from the hum level standpoint. The initial suggestions advanced by the RCA Victor Company have been successfully tried on two RAB receiving equipment having different initial hum difficulties. It is understood that similar tests have also been successfully tried on RAB receiving equipment at the RCA Victor Company's factory.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 05, 1934
- Accession Number
- AD1145253
Entities
People
- A. H. Taylor
- John H. Gough
- Tamara M. Davis
Organizations
- United States Naval Research Laboratory