Cart (Loading....) | Create Account
Close category search window
 

Present and Future Capabilities of Microwave Crystal 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

1 Author(s)
Mccoy, C.T. ; Philco Corp., Philadelphia, Pa.

The lower limits of receiver noise are explained in terms of the fundamental physical constants of vacuum tubes and microwave crystal rectifiers. With negative-grid vacuum tubes, the receiver noise, expressed in absolute temperature units, can be about 30°K at 10 mc but increases to about 1000°K at 1000 mc. For crystal superheterodyne at all frequencies below 10,000 mc, the receiver noise can be down to 600°K, limited only by the crystal mixer. Above 10,000 mc the crystal rectifier parasitic elements-spreading resistance and barrier capacity-cause the receiver noise to increase rapidly to values of approximately 7000°K at 70,000 mc. For the future, high mobility semiconductors and new rectifier geometry promise substantial reduction of the parasitics. Also, a cooling mechanism promises limitless reduction in noise; a receiver noise of 150°K for all frequencies below 100,000 mc seems feasible.

Published in:

Proceedings of the IRE  (Volume:46 ,  Issue: 1 )

Date of Publication:

Jan. 1958

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.