High Pass filter to attenuate HF radio transmit signal

[dimab]

My scanner/SDR dongles RX gets wiped out when my HF radio transmits on 28MHz.
I currently have a discone antenna going into a 30MHz high pass filter (HPN-30118 Combined Notch Filter | Scanner Master) than into a Stridsburg active multicoupler, than into a physlcal scanner, and a few SDR dongles.
The high pass filter does fine for 14Mhz and lower, but struggles a lot with 28MHz.
I know that the Stridsburg is part of the issue because of the amp in there.
Will this filter do any better than than the 30Mhz filter? I don't need anything under 154MHz Lumped LC High Pass Filter, 133 - 1000 MHz | BHP-150+ | Mini-Circuits
Is there any way to further improve the attenuation while still using the Stridsburg?
Am I doing any long term damage to the scanner/SDR dongles by hitting them with 100w of HF signal?

 

[KevinC]

Maybe, maybe not. It depends on how strong your HF rig is hitting your RX system.

But seeing how this filter provides 70+ dB of rejection under 50 mHz it would probably work.

 

[dimab]

Could I put 2 30MHz high pass filters in series?

 

[prcguy]

I think the BHP-100 filter would be a better choice with between 70 and 90dB rejection over the .3 to 31Mhz range and very low insertion loss between 90MHz and 1GHz. The BHP-150 has higher insertion loss within the VHF air band. Only one filter should be needed and two starts to get too much insertion loss.

Connectorized Band Stop Filter, 88-105 MHz | ZBSF-95-N+ | Mini-Circuits

Mini-Circuits is a global leader in the design and manufacturing of RF, IF, and microwave components from DC to 86GHz.

www.minicircuits.com

I would still consider a good FM trap and the Minicircuits ZBSF-95 is the best I've seen.

Connectorized Band Stop Filter, 88-105 MHz | ZBSF-95-N+ | Mini-Circuits

Mini-Circuits is a global leader in the design and manufacturing of RF, IF, and microwave components from DC to 86GHz.

www.minicircuits.com