[JRC] NRD-545 Filter Characteristics

[Chris Smolinski]

I've owned my 545 for about a year now, and have been very pleased 
with it. I find the audio acceptable, although my previous receiver 
was an Icom R71A, so perhaps I am just used to poor audio ;-)

I primarily use it for utility monitoring, also some pirate listening 
on the side, almost never for SWBC listening. I find the filtering to 
be excellent (and I have the Collins Mechanical filters in my R71A).

I have started to run some tests on the 545 to see what it is 
actually doing, documenting my results on the web. It's a work in 
progress, and only just started, but I have some results of filtering 
tests available here: http://www.blackcatsystems.com/NRD545/

I'd appreciate any comments, including whether my technique of just 
looking at noise (no signal present) is even acceptable for looking 
at the audio/filtering characteristics.

Next I want to look into the whole issue of whether or not the 3rd IF 
filtering is sufficient or not.

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Chris Smolinski
Black Cat Systems
http://www.blackcatsystems.com