Something isn't right. I listen to 660 AM and 1010 AM and other NYC stations a lot and I never have a problem. Now the filters in front of the QSD are <not> optimized for these LF and MF frequencies. If you intend on using this regularly as an AM broadcast radio, I would suggest you design a LPF that cuts off as low as you can stand to design (or buy). Strong signals on (say) 4.5 MHz will mix down into the passband at 1500 kHz. A strong broadcast station at 1600 kHz will be audible at 533 kHz, etc.
Bob KD5NWA wrote: > I recently bought a SDR-1000 at Dayton and have been playing with it. > I'm using a Delta-44 card with my 2.4 GHz Pentium 4 PC, parallel port > connect, and V16.1 software. > I have no reception of AM broadcast stations from 520KHz to 780KHz, my > alarm clock picks up several stations, the SDR-1000 nothing, not even a > trace that there are stations there. > > I keep picking up a Mexican station on 40KHz and every 20KHz or so > thereafter up to around 300KHz even with the pre-amp off. > > On several of the bands below the AM band I have massive spurs -40dB to > -55dB, as you tune near them they disappear and new ones show up a few > KHz away. > > General lack of signals on the band, when I hook the same antenna to a > TS-930, I see lots of signals and AM stations below 790KHz. > > I have tried adding delays to the printer port to no avail. The radio's > power supply is a 12A Astron linear power supply, and computer are > plugged on the same outlet. > > Any clues? > -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats, NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman Laziness is the number one inspiration for ingenuity. Guilty as charged! _______________________________________________ FlexRadio mailing list FlexRadio@flex-radio.biz http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://mail.flex-radio.biz/pipermail/flexradio_flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
