Topband: Need help in winning a Preamp Wager

[Tim Duffy K3LR]

Jim,

You are correct. The 10 to 11 dB loss I have is measured on 80 meters. It
is half of that on 160. I stand corrected.

73,
Tim K3LR




Jim Brown wrote:

> On Fri, 25 Feb 2005 18:18:49 -0600, Tim Duffy K3LR wrote:
>
> >I have a 1200 foot European beverage that takes 1400 feet
> >of RG8x to get to it. The feedline loss to the receiver
> >is about 11 dB.
>
> Gee, I hadn't thought of a feedline that long! With that much loss, I
> would certainly agree -- IF I was in a relatively quiet RF
> environment. :)
>
> On the other hand, 11 dB seems high for that length of that cable at
> 1.8 MHz. Have you measured that much loss?  If so, I would be
> replacing it. Belden's data for 9258 ("sort of" equivalent to RG8X)
> is 0.37 dB/100 ft at 2 MHz. That works out to just over 5 dB for 1400
> ft. At 80 meters, it's more like 0.55 dB/100 ft.
>
> Have you found receive antennas on 160 to be circuit noise limited
> with the preamp in the shack?
>
> Jim K9YC
>
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