I'm curious, how well these filters would work in lieu of the Collins filters? I have a 75A3 with just the 3.2 Kcs mechanical filter and it just plain sucks. Maybe if it had something along the lines of a 5.5~6.0 Kcs might make it a little more tolerable. Mod-U-Lator, Mike(y) W3SLK ----- Original Message ----- From: "Brett gazdzinski" <[EMAIL PROTECTED]> To: "'Jim Candela'" <[EMAIL PROTECTED]>; "'Discussion of AM Radio in the Amateur Service'" <[email protected]> Sent: Sunday, October 01, 2006 8:25 PM Subject: RE: [AMRadio] SP-600 IF Bandwith Specification
Yes, the Kiwa filters are something like 5.5Kc at -6db, and 6 Kc at -60 db! Brett N2DTS > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jim Candela > Sent: Sunday, October 01, 2006 7:34 PM > To: Discussion of AM Radio in the Amateur Service > Subject: [AMRadio] SP-600 IF Bandwith Specification > > > > I stumbled on a good mechanical filter article that goes into > upgrading the SX-42 and SP-600. I found this pretty interesting. > > This is how it starts: > > A complaint many shortwave receiver owners have is the > inadequate skirt selectivity in their equipment. This is not > just a problem in old or inexpensive units. The skirt > selectivity of even some modem, top-priced receivers is less > than what it could be for dealing with current crowded band > conditions. Mechanical filters are often expensive, and they > may need accompanying resonating capacitors. Sometimes a good > drop-in substitute filter can be found; otherwise > installation may be difficult. Even with a new filter > successfully in place, an insertion loss can result because > of impedance mismatch. Such a loss, averaging 6 dB, is not > important for strong signals, but for weak ones it makes all > the difference in readability. > > > > http://www.kiwa.com/goodwin.htm > > The -6/-6OdB band widths for the SX-42 are about 4/21 kHz and > for the SP-600J about 3/18 kHz - good in their respective > times, but most inadequate for today's conditions. > > SP-600: > > '3' means 3.0 Khz at -6db, and 18 Khz at -60db > '8' means 8.0 Khz at -6 db, and 26 Khz at -60db > '13' means 13.0 Khz at -6db, and 35 Khz at -60db > > Jim > JKO > > > > > ______________________________________________________________ > AMRadio mailing list > List Home: http://mailman.qth.net/mailman/listinfo/amradio > Partner Website: http://www.amfone.net > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:[email protected] > ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] ______________________________________________________________ AMRadio mailing list List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected]
