|[AMRadio] SP-600 IF Bandwith Specification|
brett.gazdzinski at verizonbusiness.com
Sun Oct 1 20:25:50 EDT 2006
Yes, the Kiwa filters are something like
5.5Kc at -6db, and 6 Kc at -60 db!
> -----Original Message-----
> From: amradio-bounces at mailman.qth.net
> [mailto:amradio-bounces at mailman.qth.net] 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.
> 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.
> '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
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