Vacuum tube equipment

A. Joseph Ross
Thu Sep 1 23:07:51 EDT 2005

On 1 Sep 2005 at 12:54, Garrett Wollman wrote:

> For FM reception, sensitivity is rarely a problem any more.  Even the
> fifteen-cent tuner-on-a-chip variety are sensitive enough to pull out
> signals a few dB above the thermal noise floor.  The problem is
> invariably one of selectivity: if your front end is too broadband, the
> AGC circuit will be overloaded by strong nearby (in frequency and
> location) signals and thus "miss" the weak signal you're trying to
> tune.  

This, of course, is because FM stations have higher power than they once had.  Which just 
exacerbates the problem of poorer selectivity.

I remember in the late 50s or early 60s, living in Bedford, I could pick up WOTW-FM from 
Nashua, and in their sign-off, to my surprise, they said their power output was 1000 watts, 
just like the AM.

A. Joseph Ross, J.D.                           617.367.0468
 15 Court Square, Suite 210                 Fax 617.742.7581
Boston, MA 02108-2503           

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