HFU HF Underground

General Category => General Radio Discussion => Topic started by: redhat on January 08, 2011, 0527 UTC

Title: Low pass filters for 6.900~ish MHz
Post by: redhat on January 08, 2011, 0527 UTC

I got some I think T-126-2 torroids kicking around as well as some HV mica caps of various sizes.  I'm looking more for winding directions more than anything else, as most 7 pole filters I've found on the web list cap values and core type, but nothing with regard to winding instructions.  Looking for something that can handle at least 300W PEP.

Thanks,

-+RH

Title: Re: Low pass filters for 6.900~ish MHz
Post by: lovemyradios on January 21, 2011, 1847 UTC

I have found that cutting your coax at 1/2 or full wave length, keeping your dipole up way high, using a decent balun and grounding everything super good, eliminates RFI.  Might not need filters if you take those steps, at least for 300-watts.  Unless you live in the middle of an apartment complex and then you'll probably come in on the phones and cable.  Good luck