Tim, Thank you for info; i will look for the current filter gain values and adjust them if necessary.
73 QRO de Rudolf, HB9ARI Tim Heasman wrote: > Hi Rudolf, > > Just checked the gains on my 1 kHz and 400 Hz filters they are 3 and 8 > dB. I also checked the audio noise using the dBV display and the noise > reduced each time I reduced the bandwidth from 2.8 kHz down to 200 Hz > and lower. > > Use the K3 utility to check the gains. > > > 73 > > Tim > > gm4lmh > > ----- Original Message ----- From: "hb9ari" <[email protected]> > To: "elecraft" <[email protected]> > Sent: Monday, February 23, 2009 3:44 PM > Subject: [Elecraft] Noise going up with reducing XTAL filter BW > > >> Hello, >> >> Can somebody explain to me why the "audio" noise >> increase when i select a lower BW XTAL filter? >> For example going from 1k8 to 400Hz. >> >> As i use often BPSK31, the "blue" background >> of my waterfall (without signal present) go >> into the "yellow" color; (using Digipan with >> "standard" waterfall colors). >> I was expecting a "constant" level or a noise >> reduction, but not an increase. >> >> Is it a Filter gain setting to modify in my K3? >> >> Mny tnx in advance! >> >> 73 QRO de Rudolf, HB9ARI >> >> PS At 66 yo, it's not to late to learn something! >> >> >> ______________________________________________________________ >> 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 > > ______________________________________________________________ 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
