[R-390] Filter testing

[quartz55]

I used the test schematic from the F455N data sheet someone posted here a few days ago. 

http://i251.photobucket.com/albums/gg287/DogTi/R390A/filterjigschematic_zps43bdbebb.jpg

All I did was put a .01uf and a 100K in series with a connector on a Pomona box, installed a Teflon feedthrough and made some leads to solder to the filter.  As you can see I put the 82pf caps and the vari cap on the filter and a 100K load on the output.  The input is from my Motorola R2005/HS, 4VP-P out and the test leads go to the scope on the same SM.

The 2K filter has the magnetostrictive wires intact.  It looks like the foam has just spread around in the unit to make lower resistance, I'm hoping I can just clean it up, re-install the bobbins, put some new foam and gasket material in the unit and solder it back together.  The fishpaper in the 2K filter was very brittle and came apart with removal.  There was no tape around the copper cups and the bias magnets.  The bobbins were held in the copper cups with some hard black glue which I broke loose to remove them.  The lugs on the end caps that have the hole in them seem to be welded to the caps because I used them to pull on and they never got loose.  I didn't like pulling on the terminals. The butane torch gave up, so I used the propane torch very low and it actually worked better. The foam in the 2K filter was more intact so I could see it covered the whole copper cup and went all the way up to the terminals on the inside, so the 'donut' needs to be about 3/4" long, but when I touch the stuff it turns to sticky black glue.  It cleans up nicely with alcohol.

If someone has some 3/4" or more hardline with removable dielectric in it, I'd appreciate some.  The 1/2" hardline I have gives me only tiny pieces to work with.