[TenTec] Filter on the Roof

[Toby Pennington]

Blocking Dynamic Range ?  Toby
----- Original Message ----- 
From: "Mike Hyder -N4NT-" <mike_n4nt at charter.net>
To: <tentec at contesting.com>
Sent: Thursday, August 05, 2004 10:45 AM
Subject: Re: [TenTec] Filter on the Roof


> What's a BDR?
>
> ----- Original Message ----- 
> From: "n4lq" <n4lq at iglou.com>
> To: <tentec at contesting.com>
> Sent: Thursday, August 05, 2004 10:21 AM
> Subject: Re: [TenTec] Filter on the Roof
>
>
> Well Buck, I guess you could just fiddle around with it until the BDR
> degrades then you'll know you have the filter in-line. Isn't it amazing
> what we've come too? Rigs are now so complex that we can't even tell when
> a filter is engaged and when it is, reception is degraded? No wonder you
> are confused!
>
> -----Original Message-----
> From: K4IA at aol.com
> To: tentec at contesting.com
> Date: Thu, 5 Aug 2004 09:42:10 EDT
> Subject: [TenTec] Orion Roofing Filter Cut In
>
> > I am confused by the scheme used to automatically cut in the Orion
> > roofing
> > filters.
> >
> > Why does the filter not cut in until the DSP bandwidth is substantially
> > less
> > than the filter?
> >
> > For example, the 2.4 filter doesn't switch in until the DSP is at
> > 1.990.
> >
> > The 1.8 doesn't engage until the DSP is at 1.400  This is way too
> > narrow for
> > SSB - thus there is no effective roofing filter for narrow SSB and one
> > could
> > argue this roofing filter is useless for SSB.  Yes, I know you can set
> > the
> > passband for +150 and still be able to decipher SSB at that narrow a
> > DSP setting,
> > but speech is very difficult to understand.
> >
> > The 1.0 comes in at .740  Is this one of the reasons some have switched
> > out
> > the 1.0 in favor of the INRAD 600 in this position?
> >
> > The 500 is at 350.  I don't have the 250 so I can't comment on that
> > one.
> >
> > Wouldn't it make more sense to have the roofing filter match the DSP?
> >
> > Would it make sense to have the roofing filter kick in "early" as the
> > INRAD
> > 600 does when placed in the 1.0 position?
> >
> > Radio k4ia
> > "Buck"
> > Fredericksburg, Virginia USA
> > _______________________________________________
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> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
>
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