« Coil Shielding Choices - John Dunn, Consultant, Ambertec, P.E., P.C. | Main | Death Sentence - John Dunn, Consultant, Ambertec, P.E., P.C. »

April 24, 2012

Comments

Feed You can follow this conversation by subscribing to the comment feed for this post.

George Storm

In order to be meaningful, I would have thought that the term "Zero IF" would need to refer to performing the demodulation itself at baseband. Such demodulation requires that two mixed signals are available at baseband - the so-called InPhase and Quadrature components.
This system of course carries out the demodulation at the 10.7-MHz IF.
This is of course no criticism of the technique itself - merely that the definition used here for "Zero IF" would cause nearly every FM demodulation system I have either designed or tinkered to be redefined as being a hybrid ZIF (or DZIF).

Victor Koren

The '614 with '612 is a single conversion receiver. The '615 with '612 is a double conversion receiver. Many years ago I was given a NE604 (forerunner of the '614) pre-production sample for evaluation.

Carl Schwab

DZIF response----The oscillator of the ILOD IS the second oscillator. Recall the rational of the dual conversion receiver what the FIRST IF (10.7 MHz) solved the image problem while the SECOND IF @ 455 KHz solved the adjacent channel selectivity problem. In DZIF the second oscillator is at 10.7 MHz so that adjacent channel interference, either above or below can be handled by a LPF, Low Pass Filter. So in DZIF the 455 KHz function is now handled at baseband. The mixer for the second conversion is the phase detector part of ILOD. IT WORKS.

BTW Victor you are correct about the '614 vs '615. That is why I used the '614.

Verify your Comment

Previewing your Comment

This is only a preview. Your comment has not yet been posted.

Working...
Your comment could not be posted. Error type:
Your comment has been saved. Comments are moderated and will not appear until approved by the author. Post another comment

The letters and numbers you entered did not match the image. Please try again.

As a final step before posting your comment, enter the letters and numbers you see in the image below. This prevents automated programs from posting comments.

Having trouble reading this image? View an alternate.

Working...

Post a comment

Comments are moderated, and will not appear until the author has approved them.

Your Information

(Name and email address are required. Email address will not be displayed with the comment.)

Editor

  Learn about our  

 free engineering 

consulting referral 

      service at:

 

  IEEE Consultant's 

      Network of 

     Long Island

 

We have over forty 

electrical, electronic, 

mechanical and 

software engineers 

with expertise in more 

than sixty-five categories 

of technology and business. 

All are members of the 

IEEE and adhere to the 

IEEE professional codes 

of ethics. 

No fee is charged for the

referral service. 

Each member is an 

independent consultant 

and negotiates his/her 

own consulting agreement.

 

Editor: Jerry Brown

Contributors:

John Dunn

Marty Kanner

Murray Kleiner

Dick LaRosa

David Pinkowitz

Carl Schwab

Gerry Bodner

Larry Rachman

 

Unless otherwise noted, 

reprinting or republication 

of anarticle on this blog is 

authorized by crediting the 

author and prominently 

displaying the following 

sentence at the beginning 

or end of the article,

including the hyperlink to

IEEE Consultant's Network 

of Long Island


"This report is republished 

with permission of IEEE 

Consultant's Network of 

Long Island"

 

Pages

Blog powered by Typepad

Enter your email address:

Delivered by FeedBurner