Hum in tx

I have been told by two stations that I have a bad hum in my transmissions.Any ideas?

We're going to need a lot more details. List of equipment, etc.

I have a Radio Shack HTX-10,25 watts.It's hooked to an inverted v antenna,and hooked to a MFJ 4312 powersupply.

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Originally Posted by kk4fpx

I have a Radio Shack HTX-10,25 watts.It's hooked to an inverted v antenna,and hooked to a MFJ 4312 powersupply.

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My first suspect would be the Mighty Fine Junk power supply. Can you try powering it from a car battery or another power supply?

Yes. Test it on another power supply. If that fixes it then you'll need to change the big caps in the PS. This can be dangerous as you'll need to make sure they are completely discharged. Yep, they pack a smack that could kill you. Don't ask me how.
A band-aid that might work for a while would be to ground the PS and radio separately.
As for the antenna, some people are for grounding the shield leg, some are not.

I was just talking to a station on California.He told me to put my finger on the mike plug . He said that it worked.next?

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Originally Posted by kk4fpx

I was just talking to a station on California.He told me to put my finger on the mike plug . He said that it worked.next?

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Ground the radio and PS separately.

Not sure how to do that.

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Originally Posted by kk4fpx

Not sure how to do that.

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http://www.hamuniverse.com/grounding.html

I saved the site.I'll go over it later.Thanks