hummmmmmmm

peterr · 11th October 2003, 10:10 AM

Yes, I am desperate:

I am having big problems with groundloop hum through the cable antenna connection of my tuner. It is so bad that it is impossible to listen to the radio. I tried connecting the antenna ground to earth ground, this helped a little but not nearly enough.

does anybody know how to solve this?

Netlist · 11th October 2003, 10:33 AM

Did you try with a small new cable directly connected to the wall?

/Hugo

jam · 11th October 2003, 01:19 PM

Peter,

You need an isolation transformer that breaks your ground connection to your antenna. Several companies make them. (Tributaries is one)

An easy way to make one is use two 75ohm to 300ohm converters (impedence matching transformers) and hooh up the 300 ohm leads togther. There will be some insertion loss, but a quick solution none the less.

Regards,
Jam

moamps · 11th October 2003, 02:36 PM

Hi,

insert two ceramic caps 10 to 100nF between receiver connector and antenna wall connector.

regards

peterr · 12th October 2003, 07:04 AM

Thanks for the suggestions.
I will try them and see if it helps.
Thanks.

11th October 2003, 10:10 AM	#1
peterr diyAudio Member Join Date: Apr 2002 Location: Amsterdam	hummmmmmmm Yes, I am desperate: I am having big problems with groundloop hum through the cable antenna connection of my tuner. It is so bad that it is impossible to listen to the radio. I tried connecting the antenna ground to earth ground, this helped a little but not nearly enough. does anybody know how to solve this? __________________ Keep an open mind. It helps. Peter

12th October 2003, 07:04 AM	#5
peterr diyAudio Member Join Date: Apr 2002 Location: Amsterdam	Thanks for the suggestions. I will try them and see if it helps. Thanks. __________________ Keep an open mind. It helps. Peter

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11th October 2003, 10:33 AM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Did you try with a small new cable directly connected to the wall? /Hugo

11th October 2003, 01:19 PM	#3
jam diyAudio Member Join Date: May 2001 Location: Charlotte,NC,USA	Peter, You need an isolation transformer that breaks your ground connection to your antenna. Several companies make them. (Tributaries is one) An easy way to make one is use two 75ohm to 300ohm converters (impedence matching transformers) and hooh up the 300 ohm leads togther. There will be some insertion loss, but a quick solution none the less. Regards, Jam