[Fwd: Re: Topband: Two Wire Beverage Query...]

[Herb Schoenbohm]

-------- Original Message --------
Subject: 	Re: Topband: Two Wire Beverage Query...
Date: 	Fri, 20 Aug 2004 06:57:01 -0400
From: 	Herb Schoenbohm <herbs at vitelcom.net>
To: 	Ford Peterson <ford at cmgate.com>
References: 	<000b01c48672$52e3efc0$6800a8c0 at Office2>



Ford,

I just recall from the original Beverage 1922 paper that the true 
characteristic and performance of a classic Beverage are enhanced by 
relatively poor soil under the length of the wire creating the wave tilt 
required.  In other words a good ground at each end is the key, I would 
imagine.  Also a Beverage over a salt marsh or salt water is not 
supposed to be all that hot.  My advise, don't run a ground wire under 
any Beverage, although with a multiwire one all bets may be off, but I 
am not sure. But I understand a ground return underneath may not be the 
way to go.  I think it would be preferable to terminate with the correct 
impedance, transformer or no transformer.  Using a Vactrol or a 2K non 
inductive pot may be the easier way to make it work.  Send the RX audio 
out on a 2 meter simplex frequency while listening to a Ground wave AM 
station in the undesired direction with the BFO on.(Try the expanded 
band from 1700 on done till you get the station you need.  The FCC 
online Media Bureau data base will give you power and location)  Adjust 
the pot for the greatest rejection in the undesired direction.   That is 
the way I have done it for years and I still think it is the easiest way 
to get something to happen for you.  You can always replace the pot if 
you wish with the correct fixed value.  However, sometimes with seasonal 
changes the soil resistance, especially in cold climates, or during 
rainy seasons, will change and thus you might want to check the best 
null at different times of the year.

Herb Schoenbohm, KV4FZ

Ford Peterson wrote:

>It seems to me that I've seen some discussion about running a wire on the ground along the length of a beverage to connect the grounds between the feed point and the termination.  Is this true?  This 1 wavelength beverage is 9' off what appears to be very high conductivity soil.  I'm using a transformer instead of resistors to terminate the end, which means I need a pretty good ground return to make it work correctly.  Would another run of wire help?
>
>Ford-N0FP
>ford at cmgate.com
>
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