Cecile, The SDR 1000 user manual says on page 8: "While the SDR1000 covers frequencies down to 11 kHz, additional filtering is required to minimize response to harmonics. The optional filter bank (on the RFE board) allows the user to customize the radio to add support for such frequencies". You need a preselector and / or antenna tuner to enjoy listening on long and medium wave. I have done very successful dx reception of non directional beacons on long wave with the SDR1000. However, I use a preselector with three parallel tuned circuits and Q-multiplier in front of the SDR1000 to minimize the reponse to harmonics. I cannot see an easy fix to get rid of spurs on these frequencies.
Best 73 Willi ----- Original Message ----- From: "KD5NWA" <[EMAIL PROTECTED]> To: "FlexRadio" <FlexRadio@flex-radio.biz> Sent: Monday, May 29, 2006 8:10 PM Subject: [Flexradio] SDR-1000 poor perfomance on receive. >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? > -- > > Cecil > KD5NWA > www.qrpradio.com > > > _______________________________________________ > 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 > _______________________________________________ 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
