[1000mp] MP Roofing Filter from INRAD

[Harry Yingst]

Turn off the DSP and you will hear it


--- Pete Smith <n4zr at contesting.com> wrote:
> At 09:02 AM 5/18/2004, you wrote:
> >suspect, but did not have time to question George on the
> >matter, that the 2 dB gain figure was a compromise between a
> >little noise reduction and IMD.  I figure that one can use
> >the radio's DSP or an external filter (even a relatively
> >simple passive analog filter) to remove the hiss if it is
> >too objectionable.  There is no way to remove the IMD once
> >the second mixer gets crunched.
> 
> 
> I've got to say that even on 10 meters, I have never noticed the
> difference 
> in background hiss on my Mark V since installing the mod (once I
> adjusted 
> the IF gain per recommendation).  With my antennas, there is a
> noticeable 
> drop in noise when I disconnect the antenna input, so I can't see
> where the 
> hiss reduction is an issue here.  I can reliably hear people who are
> far 
> too weak even to make the S-meter start to indicate.  I suspect this
> hiss 
> is more an issue for people using MPs with transverters or people in 
> super-quiet locations.
> 
> 
> 73, Pete N4ZR
> The World HF Contest Station Database
> was updated on April 26, 2004
> 2706 contest stations at
> www.pvrc.org/WCSD/WCSDsearch.htm  
> 
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=====
Harry - AB2PN

-


	
		
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