Hi Bob,
My area is one of the marginal locations. The
major difference I notice is using bipolar vs
GaAs ("gas-fets"). The "newer generation" of
phempt devices are very nice. Since Chip Angle
doesn't like anything but bipolar at VHF, I
use other brands or my own designs.
Anyone wanting to read a real world article
about this subject can download the Dubus Preamp
article from the www.radiowrench.com/sonic web
page.
The interesting part about the noise floor is
how much the man-made contribution varies during
certain times of the year. We also get a lot of
really wild ducting and fresnel-zone action,
especially in the summer months.
cheers,
skipp
> Bob Dengler <[EMAIL PROTECTED]> wrote:
> At 2/14/2005 01:43 PM, you wrote:
>
> Added noise will always degrade the S/N. The
> question is would it even be noticeable given
> the dominant noise floor on 2 meters. Here in
> the LA basin it can be at least 3000 K, so an
> extra 150 K of preamp noise isn't going to be
> too noticeable.
>
> If you can hear a difference between a GaAsFET
> & a JFET preamp on a real-world VHF system,
> consider yourself lucky: you live in a low-noise
> environment.
> Bob NO6B
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