Hello Cecil, We specify on our website that a preselector is REQUIRED for good operation below 160m. We do NOT provide individual filters below 160m. The SDR-1000 is designed for best performance on the HF bands. It can perform well on MW if you put preselection in front of the radio and we have customers who are very satisfied with that type of configuration.
73, Gerald Gerald Youngblood, K5SDR FlexRadio Systems Ph: 512-535-5266 Fax: 512-233-5143 Email: [EMAIL PROTECTED] Web: www.flex-radio.com > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of KD5NWA > Sent: Monday, May 29, 2006 6:37 PM > To: Willi Reppel > Cc: FlexRadio > Subject: Re: [Flexradio] SDR-1000 poor perfomance on receive. > > The main problem it's not that I'm receiving signals that > don't belong in the AM band but that it's totally deaf below 790KHz > > I have that one Mexican station way at the bottom, which it's > probably due to filtering but my main problem is lack of signals. > > > At 03:52 PM 5/29/2006, you wrote: > >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 > > > > > Cecil Bayona > KD5NWA > www.qrpradio.com > > "Windows the worlds most successful software virus" > > > _______________________________________________ > 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://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Homepage: http://www.flex-radio.com
