[BC] The first 3 dB...

[DANA PUOPOLO]

The 3 db would come from improving the noise level of the tuner. 
A GOOD UHF tuner might have a noise figure of 9-12 db. With a cheap GasFet,
this could easily be improved to below 2 db. Remember, we're only talking 700
mHz here.

-D


------ Original Message ------
Received: Sat, 18 Feb 2006 01:12:57 PM PST
From: "Burt I. Weiner" <biwa at earthlink.net>
To: broadcast at radiolists.net
Subject: [BC] The first 3 dB...

The noise figures of most UHF TV receivers is (worse) well above the 
background noise level of most of the UHF spectrum.  We were talking 
about UHF television spectrum, weren't we?

Burt

At 10:31 AM 2/18/2006, you wrote:
>From: Robert Meuser <Robertm at broadcast.net>
>Subject: Re: [BC] 3 dB improvement...
>To: "Broadcasters' Mailing List" <broadcast at radiolists.net>
>Message-ID: <43F74230.6050107 at broadcast.net>
>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
>That's not the point.  That first 3 db needs to come from the noise floor.
>Eliminate electricity???
>
>
>R
>
>Burt I. Weiner wrote:
> > Most UHF TV receiver front ends are pretty basic.  Some currently
> > manufactured set still go directly into a mixer without a RF stage ahead
> > of the mixer.  Low noise, wide dynamic range devices for the UHF
> > frequencies are pretty inexpensive.  Consider the front end of cell
> > phones at 900+ MHz.  Throw away stuffs.  I would never suggest a decent
> > antenna as most consumers just want to plug it in, twiddle the loop
> > antenna and watch - a fact of life.  A 3 dB front end improvement would
> > actually be pretty simple since this would be the first 3 dB and not the
> > last 3 dB.
> >
> > Burt

Burt I. Weiner Associates
Broadcast Technical Services
Glendale, California  U.S.A.
biwa at earthlink.net
K6OQK 



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