[Elecraft] Quick sanity check on filter test

[Jim Miller]

Just a quick follow up. Spoke to Howard at Elecraft support and a
replacement is in the mail!

Outstanding products backed by outstanding service!

73

jim ab3cv (happy clam!)


On Thu, May 30, 2013 at 9:24 PM, Jim Miller <jim at jtmiller.com> wrote:

> 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
>