[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [IRCA] [NRC-AM] Building a "state of the art" MW DX station
- Subject: Re: [IRCA] [NRC-AM] Building a "state of the art" MW DX station
- From: Barry McLarnon <bdm@xxxxxxxxxx>
- Date: Mon, 2 Jan 2012 22:42:27 -0500
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
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx