[R-390] Filters

[John Kolb]

On Fri, 13 Feb 2004, James Smith wrote:

>     I am looking for collins mechanical filters 6KHz and 12KHz to use in a
> EAC  R 390A receiver.  Are they available? Who might have them?
>
> Thanks in advance
>
> Jim Smith N1XAS

Collins didn't make any 6 or 12 kHz filters that would fit
the R-390A directly - what they call the "K (special)" case
in their catalogs. They made the F455K-60 and F455K-120
with the standard "K" case, which has the mounting flange
in the center of the filter rather than towards one end.
Those or the smaller Y case filters, F455Y060 and F455Y-120
could be used with some work to fabricate a mounting flange.
Dallas Lankford had an article recently on such a filter and
has posted it to the files section of this group.

As mentioned in another reply Dave Curry makes some modern
filters in 390A style cases.

The modern filters available directly from Collins generally
have a 2 Kohm in and out impedance so would require some
matching to replace the 100 Kohm 390A filters.

John
<http://members.cts.com/king/j/jlkolb>  - filters