That must be Inrad's new invisible metal enclosure:
http://www.inrad.net/product.php?productid=190&cat=94&page=1
On Thu, Aug 25, 2016 at 10:35 AM, Jeff (W4DD) <w4dd09@gmail.com> wrote:
> As I recall, the initial 4 pole filters from ten tec were not in a metal
> enclosure but the Inrad filters are.
>
> On Aug 25, 2016 8:41 AM, "Gary J FollettDukes HiFi" <dukeshifi@comcast.net
> >
> wrote:
>
> I did not realize that the Inrad filters were not shielded. Thanks for the
> info. Also, not being 8 pole, I also wonder why one would pay extra for
> one.
>
> Gary
>
>
> > On Aug 25, 2016, at 4:29 AM, Barry N1EU <barry.n1eu@gmail.com> wrote:
> >
> > If anything, I actually prefer the original Ten-Tec filters in this case
> > because they were totally sealed/enclosed and thus may prefer superior
> > crosstalk etc isolation to the unsealed Inrad filters. This is totally
> > opposite to the case for Omni 5/6 filters where Ten-Tec made unsealed
> > filters (which also tended to lose spec over the years) and the IR
> filters
> > were sealed.
> >
> > Barry N1EU
> >
> > On Thu, Aug 25, 2016 at 9:11 AM, Barry N1EU <barry.n1eu@gmail.com>
> wrote:
> >
> >>
> >>
> >> On Thu, Aug 25, 2016 at 2:05 AM, Gary J FollettDukes HiFi <
> >> dukeshifi@comcast.net> wrote:
> >>
> >>>
> >>> The only possible gain one might realize from the Inroad filter is to
> put
> >>> it where it belongs, in the 2.4 KHz slot in place of the 4 pole factory
> >>> filter as I believe the Inroad is an 8 pole filter. This would sharpen
> the
> >>> skirts of the roofing filter, offering somewhat better selectivity
> while
> >>> still offering reasonable SSB bandwidth.The roofing filter is not even
> used
> >>> in transmit so that change would not affect transmitter radio one iota.
> >>>
> >>>
> >> Negative, the Inrad filter is a 4-pole filter. Sorry, this effort is a
> >> total waste of money and time.
> >>
> >> 73, Barry N1EU
> >>
> > _______________________________________________
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> > TenTec@contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
>
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