[1000mp] Inrad filter questions

[Steven J Fraasch]

Ron:

That would seem to be about what I saw when I installed mine - a little
more gain after the mod - so I would roll it back a bit.  Running more
gain will probably result in worse IP3 and blocking dynamic range.

73,

Steve, K0SF

On Sat, 04 Jun 2005 01:13:23 -0400 Ron Kenwood <rakenwood at comcast.net>
writes:
> First the roofing filter. I installed it and tested with my Elecraft 
> XG1
> at 50 microvolts. Before the install, 1 red bar above S9. After, 2 
> red
> bars above S9. When I switch in 6 db of attenuation, both red bars 
> go
> out. My completely unscientific SWAG would be 3 db additional gain. 
> I
> know that the extra gain moves me further away from the  mythical 
> 50
> microvolts = S9.
> 
> The Inrad instructions say don't reduce the 9-1 gain unless you are
> removing the 70 MHz mod.
> 
> Do I benefit from the extra gain, or does potential noise reduction 
> of
> lowering 9-1 gain outweigh any benefit?
> 
> Second, I am considering ordering a 400 Hz Inrad filter for the sub 
> 
> receiver. I happened to read the sub receiver section of the manual 
> 
> (strictly an accident and not consistent with my normal behavior) 
> and it 
> says the sub receiver narrow filter is switched automatically by 
> mode, 
> as in AM, SSB & CW. Does this mean that it doesn't work when using 
> RTTY(FSK)?
> 
> 
> Ron, W3ZV
> 
> 
> 
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