Re: Topband: Beverage construction

[Arthur Delibert]

Carol – Regarding the use of ferrite chokes to kill common-mode noise coming in 
on the transmission line, look  on the internet for “A Ham's Guide to RFI, 
Ferrites, Baluns, and Audio Interfacing,” by Jim Brown, K9YC.  It’s a very good 
tutorial on how to construct and use chokes for common-mode noise.

--Art Delibert, KB3FJO

Sent from Mail for Windows 10

From: JC
Sent: Thursday, November 23, 2017 2:58 PM
To: 'Carol Richards'; 
Topband@contesting.com
Subject: Re: Topband: Beverage construction

Hi Carol

The big issue with any RX antenna is common mode noise, the feed line can
interact with all other wires in your station, including AC wires 115Vac,
rotor cables etc.

Try this, on 9:1 transformer, remove  the beverage wire and connect a 450
resistor. Removing the wire for the resistor de signal coming from the RX
antenna should be zero. Turn the preamplifier on, any noise you hear is not
coming from the antenna and it is common mode noise that you need to clean.

Choke can help a lot if you have a good ground connection.

73's
JC
N4IS

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carol
Richards
Sent: Thursday, November 23, 2017 12:36 PM
To: Topband@contesting.com
Subject: Topband: Beverage construction

Hello all,


I finally put up a beverage antenna...about 400 feet long. I am feeding
it through a 9:1 transformer with some 50 ohm cable ( RG 59). I am
finding that it is noisier than my transmit antenna, contrary to what it
should be. The wire stays about 6-8feet above ground. ground rods at
each end, etc.

Any thoughts on the problem and a cure?


Thanks,


Carol

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Re: Topband: Beverage construction

[JC]

Hi Carol

The big issue with any RX antenna is common mode noise, the feed line can
interact with all other wires in your station, including AC wires 115Vac,
rotor cables etc. 

Try this, on 9:1 transformer, remove  the beverage wire and connect a 450
resistor. Removing the wire for the resistor de signal coming from the RX
antenna should be zero. Turn the preamplifier on, any noise you hear is not
coming from the antenna and it is common mode noise that you need to clean.

Choke can help a lot if you have a good ground connection.

73's
JC
N4IS

-Original Message-
From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Carol
Richards
Sent: Thursday, November 23, 2017 12:36 PM
To: Topband@contesting.com
Subject: Topband: Beverage construction

Hello all,


I finally put up a beverage antenna...about 400 feet long. I am feeding 
it through a 9:1 transformer with some 50 ohm cable ( RG 59). I am 
finding that it is noisier than my transmit antenna, contrary to what it 
should be. The wire stays about 6-8feet above ground. ground rods at 
each end, etc.

Any thoughts on the problem and a cure?


Thanks,


Carol

_
Topband Reflector Archives - http://www.contesting.com/_topband

_
Topband Reflector Archives - http://www.contesting.com/_topband

Re: Topband: Beverage construction

[Dave]

What value termination resistor, how far did you drive the ground rods, did you 
slope the last 50' on each end?


Sent from my Verizon 4G LTE Droid
On Nov 23, 2017 12:36 PM, Carol Richards  wrote:
>
> Hello all, 
>
>
> I finally put up a beverage antenna...about 400 feet long. I am feeding 
> it through a 9:1 transformer with some 50 ohm cable ( RG 59). I am 
> finding that it is noisier than my transmit antenna, contrary to what it 
> should be. The wire stays about 6-8feet above ground. ground rods at 
> each end, etc. 
>
> Any thoughts on the problem and a cure? 
>
>
> Thanks, 
>
>
> Carol 
>
> _ 
> Topband Reflector Archives - http://www.contesting.com/_topband 
_
Topband Reflector Archives - http://www.contesting.com/_topband

Topband: Beverage construction

[Carol Richards]

Hello all,


I finally put up a beverage antenna...about 400 feet long. I am feeding 
it through a 9:1 transformer with some 50 ohm cable ( RG 59). I am 
finding that it is noisier than my transmit antenna, contrary to what it 
should be. The wire stays about 6-8feet above ground. ground rods at 
each end, etc.


Any thoughts on the problem and a cure?


Thanks,


Carol

_
Topband Reflector Archives - http://www.contesting.com/_topband