[Elecraft] KBPF3 usefulness or effectiveness?

[Stephen Prior]

James

I suspect that 7.5MHz is far too close to the existing 40m bandpass
filtering for you to notice any difference between it and the KBPF3. I can't
try it here as I only have the single receiver, but if you to look around
12MHz for example I expect you would detect a significant difference.

73 Stephen G4SJP
K3 #980


On 28/12/2009 02:19, "James Sarte" <k2qi.nyc at gmail.com> wrote:

> 
> Hello Elecrafters,
> 
> When I assembled my K3 I installed the KBPF3 module in the sub receiver
> figuring that I'd use the sub for SWL.  However, I was thinking about moving
> it back to the main receiver in order to take full advantage of the
> synchronous AM detection feature.  What I noticed though was that I can't
> really seem to tell if the KBPF3 makes a difference when listening to
> out-of-band stations.
> 
> For example, tuning around tonight I came across a strong SW station on 7505
> KHz.  Logic tells me that the sub receiver's AF output should be
> significantly clearer, perhaps louder, than that of the main receiver.
> Going back and forth between them doesn't seem to show any differences in
> perceived audio quality though.
> 
> So, I'm curious now if there are any tests I can perform that would
> demonstrate the effectiveness of the KBPF3 module.
> 
> Thank you for your valued input.
> 
> Vy 73 de James K2QI