[600MRG] Noise issues.

[Brian, WA1ZMS]

My 2cents is to build one of the 'ZMS amps for the 600m loop. You can adjust the gain by changing the feedback cap. But the best point is that it will give you a nice "active balun" that should do a great job for a ballanced loop to a single- ended input in coax.


-Brian, WA1ZMS/4 & XSH/31 & WG2 XFQ in Va.


On Mar 11, 2014, at 6:50 PM, "Kenneth G. Gordon" <kgordon2006 at frontier.com> wrote:

> Gents:
> 
> I am being plagued by a 20db over S-9 noise level on 80 meters, worse as 
> one goes lower, somewhat better as one goes higher, but still a steady S-
> 9 on 20 meters.
> 
> I propose to begin the search for the source, or sources, by integrating 
> one of my excellent Stoddart loops (3 feet diameter and 6 inches 
> diameter) into the borrowed FT-890 I presently am using.
> 
> The Stoddart loops are fed with twin-ax, but the FT-890, of course, 
> connects via an SO-239.
> 
> What do you suggest I use to connect the two? A balun? Or can one simply 
> short the two "hots" in the twinax together and connect the shield and 
> that connection to a PL-259?
> 
> Ken W7EKB
> 
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