Re: [IRCA] [NRC-AM] Building a "state of the art" MW DX station

[Barry McLarnon <bdm@xxxxxxxxxx>]

On Monday 02 January 2012 20:24:49 Russ Edmunds wrote:
> I'm just not sold on a vertical in a high noise location. Most man-made
>  electrical noise is vertically polarized, and the use of a vertical
>  frequently increases the signal/noise ratio.

I think Russ meant to say "decreases" here.

As Mark Durenberger says, noise that is propagated over some distance by 
groundwave will be likely be predominantly vertically polarized, but local 
noise sources tend to be randomly polarized.  The main trouble with vertical 
antennas is that they have no nulling capability, so if you use one, you 
should also have a second antenna (preferably a different type) and a phasing 
box.  That way, you have some chance of nulling unwanted signals, and, if 
you're lucky, some local noise sources as well.

Barry

-- 
Barry McLarnon VE3JF  Ottawa, ON
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