System Maintenance:
There may be intermittent impact on performance while updates are in progress. We apologize for the inconvenience.
By Topic

A Constant Input-Impedance RF Amplifier for VHF Television Receivers

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Yin, H.B. ; RCA TV Div., Camden, N. J. ; Wasson, H.M.

Most conventional television tuners exhibit undesirable variations of input impedance at different frequencies within the pass bands and with varying bias voltages applied to the rf amplifier tube. An analysis of the input characteristics of such tuners and commercial television antenna systems, including transmission lines, shows the formation of selective mismatch under certain conditions which may form ``holes'' within the pass band of any television channel. Such holes degrade the picture quality, particularly for color reception when a deep hole falls upon the color subcarrier. One solution to this problem is presented in this paper, using a constant input-impedance rf amplifier which consists of two stages of grounded-grid triodes in cascade with agc voltage being applied to the grid of the second stage. Other performance characteristics of this amplifier, such as noise factor, gain, overloading capability, cross modulation, etc., as compared to those of a conventional cascode rf amplifier, also are described.

Published in:

Broadcast and Television Receivers, IRE Transactions on  (Volume:BTR-3 ,  Issue: 2 )