[R-390] Filters

[quartz55]

Thanks for the ideas, yes, I've got the filter innards set in a trough, and the wire I've put into a 'sled' composed of a Teflon center with rolled up tape as the outer cover, I've thought about hemostats, but they crinkle the wire and are too large, I have a small spring clip that has flat 'teeth' so it doesn't crinkle the wire, but it's so small it's hard to deal with, it's too small to keep my fingers on it reliably, alligator clips are just too clumsy and the teeth don't meet that good, the tweezers are also clumsy and too hard to hold together.  I'm trying to come up with some sort of clamp/clip that I can slide in the trough while holding the wire on the end of the 'sled'.  I thought I could use the end handle of a voltmeter lead, but that has the pointed end and nothing good to attach the wire with, plus it's not exactly centered either.

The other problem is that all this has to go into the copper cup about 1/8" which doesn't seem like much, but we're dealing with 1/10ths of inches here.

Here's the end of the flat clip, the voltmeter probe and the 'sled' with a test wire in it.  I've found my close up lens for the camera.  That sled is about 1/4" dia.
http://i251.photobucket.com/albums/gg287/DogTi/R390A/filterwiresled_zpsb2481c56.jpg

That clip with the flat ends seems to be the thing, but it's unmanageable it's so small, maybe I can solder some handles on it and make it so it slides in the trough along with the sled.

In the meantime, I may test the 2K filter, 20logV1/V2=-25(db)  That's 17.7(or .0564) for V1/V2 if I calculate right.  Now I need to know roughly what voltage is going into the filter.  It's probably in the order of 100-200uV.  My old Motorola RF milivoltmeter will read down there.  Hmmm, maybe not smallest scale is 1mV.  That means if I put 200uV in I should be getting 11uV out.  Hmmm.  Where's that 20db gain amp.