[amsat-bb] Re: echo

[McGrane]

Hello nate- this is a perfect example of what happens when people snip
e-mails. Go back to the original: you will find that I noted that I have
the radio set in the Narrow FM mode for greater sensitivity.
pat



On Fri, 25 Aug 2006, Nate Duehr wrote:

> 
> On Aug 25, 2006, at 10:08 AM, McGrane wrote:
> 
> >
> > I should explain my setup here;
> >
> > FT8800 dual band FM rig for recieve
> > 8 element yagi with mast mounted 18 db hamtronics preamp
> > 25 feet of 9913 coax
> 
> Hasn't the FT-8800 been shown by some folks to have a "barn-door"  
> wide receiver?  I can't find the link for any real lab reports on it  
> at the moment, and all the manufacturer's put on their brochures  
> these days are the same numbers for just about every radio... .2 uV  
> for 12 dB SINAD, etc... etc... etc... no real good specifications on  
> how they perform with lots of off-frequency noise and or other crud.
> 
> Putting a high gain pre-amp in front of it without some bandpass  
> filtering is likely just crushing it.  Can you see how it performs  
> without the pre-amp and do live comparisons?  You may find the pre- 
> amp is actually making things worse.
> 
> Amplifying noise and bringing in more out of band signals sometimes  
> isn't very useful... (GRIN).
> 
> --
> Nate Duehr - WY0X
> nate@natetech.com
> 
> 
> 
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