[Elecraft] Quick sanity check on filter test

[Jim Miller]

I've long suspected the 250hz8p filter in my sub was not working correctly.

I finally took it out of the sub and placed in in the main next to another
250hz8p and set the suspect filter to kick in at 700hz and the good one to
kick in at 600hz.

I then input a test signal using a XG2 and dialed down the bandwidth from
2.8khz down through the 700 and 600 filter set points. AGC set to off.

The "good" one still requires an 8db boost to stay close to the 2.8Khz
filter in amplitude. The suspect one is *way* past that. Even if I lower
the boost on the good one to 0db boost and boost the suspect one by 8db
they still aren't close. Probably another 8-10db difference.

This is consistent with what I was seeing in the subrx vs main but by
placing the filter in a main socket I could eliminate the subrx as the
source of the problem.

Anyone else had a bad 8 pole?

I'd like some feedback on this test method to make sure I've got my ducks
in a row before getting another filter to replace this one.

Thanks

Jim ab3cv