[TenTec] 250Hz Roofing Filter

[JE2UFF]

Hi all. I am Toshi/JE2UFF.

My Orion which I hold narrow a roofing filter and it gose, a noise will
be stopped, 500Hz will be quaiet and it will become easy to hear it, but
if 250Hz is used, a noise level will increase conversely.

In 250Hz, it becomes difficult to hear it that it is noisy and convesely.

If Orion shall be 250Hz, is it the specification which a gain increases?

de JE2UFF/Toshi