Jean-marc BORD wrote: > Hi Tim, > > Thank you for your feedback, I love your marketing and your sales > addiction. > As least when you say No, one would love to have a minimum explanation > rather than just 'No'. > > I can cope with answer 37 as it is pure hardware design, but 38 is just > not a fair answer, as long as you have spare parts for SDR1K . I'm > pretty sure you can sell them, especially aiming to improve your > customer's equipments and satisfaction. > > 73's > Jean-marc F1HDI >
Jean-marc: There is no separate BPF board in the Flex 5000 systems. The filter board is integral to the transmitter or receiver. Part of the reason for this is that the entire base system board has one RX and one TX on it, is almost all surface mount, extremely low profile, and fully balanced everywhere. This makes it especially quiet and easier to manufacture than the SDR-1000 (by a lot). Frankly, it is a testimonial to software radio that the same software is going to run on both systems except for those capabilities added to the new radio that are unavailable on the SDR-1000. Bob N4HY > > Tim Ellison a écrit : > >> >> Jean-marc, >> >> The answers to your question can be found in the Knowledge Base >> FLEX-5000 FAQ article listed as questions Q37, Q38, Q39. >> http://kb.flex-radio.com/article.aspx?id=10374 >> >> -Tim >> ----- >> FRS KB Administrator >> >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Jean-marc BORD >> Sent: Wednesday, April 11, 2007 2:39 AM >> To: [EMAIL PROTECTED] >> Subject: [Flexradio] Two silly questions >> >> Hi, >> >> I have two areas of interests , which I don't see covered in either the >> Flex5000 Faq nor in the SDR1000 kdb >> >> a) The SDR1K main weaknesses are coming from the DDS/mixer board, and at >> a lower level by the non-narrowband BPF. >> On the first issue of concern, is the SDR5k design permitting an >> DDS/mixer upgrade as a kit for the SDR1K ?. >> On the second one, is it possible to get bandpass filter PCBs (I would >> need two) without the BPF components or without any components at an >> affordable price as the 3 pole chebischev can be reworked for 6 narrower >> HamBand BPF >> >> b) When designing a 'fixed 11,025kHz' narrowband receiver, the I/Q >> rejection is done within this narrowband (up 9,9kHz wide) and is pretty >> constant . As soon as you introduce dual watch, the I/Q calibration done >> at only 11,025 is not consistent within the full 80kHz audio band coming >> from the sound card (FA66 96k here). This is why m0kgk has a full I/Q >> cal within the the full AF range. Do you intend to expand the I/Q cal to >> the full AF spectrum in the future ?, if yes, either it would need the >> user to feed the receiver with multiple carriers or ask for one external >> carrier and move the LO accordingly (the strong assumption here would be >> that the I/Q drifts are mainly coming from the soundcard). >> >> Kind regards >> Jean-marc F1HDI >> >> >>> >>> >>> >> _______________________________________________ >> FlexRadio mailing list >> [EMAIL PROTECTED] >> http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz >> Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ >> FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: >> http://www.flex-radio.com/ >> >> >> >> > > > _______________________________________________ > FlexRadio mailing list > [EMAIL PROTECTED] > http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz > Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ > FlexRadio Knowledge Base: http://kb.flex-radio.com/ > FlexRadio Homepage: http://www.flex-radio.com/ > > -- Robert W. McGwier, Ph.D. Center for Communications Research 805 Bunn Drive Princeton, NJ 08540 (609)-924-4600 (sig required by employer) _______________________________________________ FlexRadio mailing list [EMAIL PROTECTED] http://mail.flex-radio.biz/mailman/listinfo/flexradio_flex-radio.biz Archive Link: http://www.mail-archive.com/flexradio%40flex-radio.biz/ FlexRadio Knowledge Base: http://kb.flex-radio.com/ FlexRadio Homepage: http://www.flex-radio.com/
