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" <[email protected]> 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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
