OK - you're talking about adding other factors (road noise). I was
talking about the home use or a controlled environment where the signal
strength and the user's ear were the only factors. I guess around
diesels, it would take 12 dB to notice any difference. ;->
Joe M.
Chuck Kelsey wrote:
>
> Yes, that's what the book says.
>
> However, I'm talking about someone out in a mobile environment where you
> have many other factors in play, including ambient road noise. Most people
> are hard pressed to be able to notice a 6 dB change under those conditions.
>
> Since we are talking repeaters here, most of our users are on a mobile or
> HT, outside of a quiet, stable environment. Usually moving a couple of
> inches or feet is going to make way more difference than 6 dB.
>
> That's my "real world" take anyway.
>
> Base station to base station with antennas mounted in the clear and a quiet
> shack, you'll probably be able to hear 3 dB, assuming you are not already
> full quieting.
>
> Chuck
> WB2EDV
>
> ----- Original Message -----
> From: "mch" <[EMAIL PROTECTED]>
> To: <Repeater-Builder@yahoogroups.com>
> Sent: Saturday, August 28, 2004 1:59 PM
> Subject: Re: [Repeater-Builder] db comparisons
>
> > I've always been taught and read that a 3dB increase (or decrease) is
> > the point at which the user can first notice that the signal has
> > changed. You can gain 3dB by either doubling your power (or ERP), or by
> > doubling the antenna height. Of course, this does not take hills into
> > account where your height doubling just happens to clear a hill. This
> > assumes that your antenna is in flat land or above the hills (or trees).
> >
> > Joe M.
> >
> > [EMAIL PROTECTED] wrote:
> > >
> > > In FM mobile service, a difference in 6 dB is usually just barely
> > > perceivable by most users. Now, I'm talking about out in the field
> > > and just listening to the signal -- no meters, just your ear.
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
>
>
> Yahoo! Groups Links
>
>
>
>
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