[TenTec] Filter on the Roof

[Mike Hyder -N4NT-]

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
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> 

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