What's a BDR?
----- Original Message -----
From: "n4lq" <n4lq@iglou.com>
To: <tentec@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@aol.com
To: tentec@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
> _______________________________________________
> TenTec mailing list
> TenTec@contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>
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