Anyone tried these 27.5m bpf filters on ebay?

[nfsus]

1PC Shortwave 27.5MHz High Isolation Band Pass Filter Narrow Band BPF 10m Band | eBay

High isolation short-wave bandpass filter (BPF): BPF-27.5-200w. Interface: SL16-F (M seat). 4 Power: 200w (SSB CW AM FM FSK FT8) higher power can be customized. Input impedance: 50 ohms; output impedance: 50 ohms.

www.ebay.com

 

[nfsus]

Well anyway I ordered one off of aliexpress for less. It should be here this week. My first order from that site as a test. Hopefully this week's it comes in as it's supposed to and also work like it's supposed to as well.

 

[sp5it]

Why do you need that kind of filter anyway?

 

[nfsus]

Honestly trying to knock out some mobile noise. Seems like a game.

 

[nfsus]

Now that's a filter

 

[BC Coyote]

No amount of fiddling with bandpass filters will knock out noise. That's not what they are for !! It's not what they do !! They have no noise-filtering circuit elements.

You are essentially attempting to fit a round peg into a square hole.

 

[nfsus]

I'm not trying to use it as a noise filter circuit. I'm trying to block out radiated rf interference coming in from the antenna path before it gets to the transceiver.

 

[sp5it]

I wonder, what is insertion loss of that filter.
Do you have any equipment to measure that?
Mike

 

[nfsus]

I wonder, what is insertion loss of that filter.
Do you have any equipment to measure that?
Mike

Only test equipment I have anymore are an swr meter and a nanovna. Claims a .5db loss

 

[sp5it]

Nanovna, nice. You can measure it with that device.
I love to see its measurements. Loss, bandwidth.
Mike

 

[nfsus]

Nanovna, nice. You can measure it with that device.
I love to see its measurements. Loss, bandwidth.
Mike

I'll set it up and see.

 

[nfsus]

Here's what they claim