Decades ago I used these surge protector / rfi filters, and picked a few up recently again. But noticed the front panels no longer have the specs printed on them, so this might help especially from the RF filtering standpoint.
Tripp Lite Isobar - the World's Most Trusted Surge Protector | Tripp Lite
Each outlet *pair* (one outlet on top of the other) is isolated from each other pair. And, the rf filtering is in series with each pair, so the further away you go from the first outlet pair closest to the ac plug, the more the filtering.
The first pair closest to the plug used to be listed as 50db attenuation. The second 75db. The 3rd pair 100db and so on. But what is the major LOW frequency? 1 mhz - right in the middle more or less of the AM Broadcast band. I normally plug in my radio into the last outlet for the most filtering.
They also incorporate a VHF filter as well, but I don't know what the center frequency for that is.
What I do know is that at my place, the AM BCB (and 160m amateur) is a total mess without it. All my house wiring acts like an antenna, and dutifully puts it out over my coax lines in the common-mode. The Tripp-Lite helps a great deal. Yet still I have to use ferrite chokes, but one step at a time. At least the Tripp-Lite brings back some sanity.
Of course there is surge protection all over the place too.
For some who power their radios (not just amateur / swl stuff, but general purpose radios, desk clock-radio's etc with wallwarts, in some cases yes, the wall warts may be noisy - but what is noisier still is the whole house acting like an antenna through the wall wart. The Tripp-Lite might alleviate the problem, or at least get it low enough to a point where simple ferrite choking of the lead to the radio might actually work.
Tripp Lite Isobar - the World's Most Trusted Surge Protector | Tripp Lite
Each outlet *pair* (one outlet on top of the other) is isolated from each other pair. And, the rf filtering is in series with each pair, so the further away you go from the first outlet pair closest to the ac plug, the more the filtering.
The first pair closest to the plug used to be listed as 50db attenuation. The second 75db. The 3rd pair 100db and so on. But what is the major LOW frequency? 1 mhz - right in the middle more or less of the AM Broadcast band. I normally plug in my radio into the last outlet for the most filtering.
They also incorporate a VHF filter as well, but I don't know what the center frequency for that is.
What I do know is that at my place, the AM BCB (and 160m amateur) is a total mess without it. All my house wiring acts like an antenna, and dutifully puts it out over my coax lines in the common-mode. The Tripp-Lite helps a great deal. Yet still I have to use ferrite chokes, but one step at a time. At least the Tripp-Lite brings back some sanity.
Of course there is surge protection all over the place too.
For some who power their radios (not just amateur / swl stuff, but general purpose radios, desk clock-radio's etc with wallwarts, in some cases yes, the wall warts may be noisy - but what is noisier still is the whole house acting like an antenna through the wall wart. The Tripp-Lite might alleviate the problem, or at least get it low enough to a point where simple ferrite choking of the lead to the radio might actually work.