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WB6FRZ

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

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Band Segment Filters for Transceivers on Same Band, Different Modes Feb 6th 2013, 05:38 6 788 on 27/2/13

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Band Segment Filters for Transceivers on Same Band, Different Modes WB6FRZ on 27/2/13
K8GU, thanks much for your thoughts.
Our radio club has experienced in-band cross-mode interference for years and for some reason I suddenly have a desire to eliminate the problem. It has plagued us during Field Day operations for as long as I can remember. So the answer to your question is yes, and yes.

Thanks for the note about broadband hash; I didn't realize many radios are that poor. It may be that what I'm trying to accomplish is not possible due to the broadband noise of many of our transmitters.

Very 73,


John
WB6FRZ
Band Segment Filters for Transceivers on Same Band, Different Modes WB6FRZ on 27/2/13
Zack, thanks for your thoughts.
In which issue of QEX is your filter design published?
I suspected that this project might be quite large, so size doesn't scare me; bring it on.

I am working with our club "antenna guy," Brian, N6IIY to maximize the benefits of cross-phased antennas spaced apart as well as filtering concepts.

Thanks for the help.

John, WB6FRZ
Band Segment Filters for Transceivers on Same Band, Different Modes WB6FRZ on 6/2/13
I'm looking for a low to medium cost solution for an age-old problem. Two stations operating the same HF band (call it 20m) with 100W each at opposite ends of the band: one on CW, the other on SSB. Without spending $5,000+ per radio for super-selective rigs how does one avoid or seriously attenuate interference? Yes, cross-polarized antennas help but I want a solution that can be built by any amateur radio individual/group for, say, Field Day, or any multi-operator event.

Notch Filters- maybe. But how to design one with a 3dB notch bandwidth of 100 kHz or so and 90 dB of attenuation? I know if it was easy it would have been done by now. There are lots of sharp minds out there - any thoughts?

Thanks.

73 de John, WB6FRZ

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