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300 ohm vs 75 ohm [message #25562]

Thu, 12 August 2004 11:47

Man From Uncle
Messages: 4
Registered: May 2009

Esquire

Greetings all,
My tuner has hookups for 75 and 300 ohm antennas. What are the pros and cons of each?
MfU

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Re: 300 ohm vs 75 ohm [message #25563 is a reply to message #25562]

Fri, 13 August 2004 14:02

Wayne Parham
Messages: 18675
Registered: January 2001

Illuminati (33rd Degree)

One thing to consider is the possibility of a ground loop when a television connected to cable TV is connected to your sound system. This can also happen if you connect cable into your Hi-Fi tuner. Using a 300 ohm transformer will isolate cable ground from your sound system's ground. Many times earth ground on the house current circuit is nowhere near cable ground so if they aren't isolated, a ground loop exists. You can reduce hum considerably by isolating these.

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