Interesting....but 6 months ago the SDR1000 was the best radio in the world....go figure
kw5tx Robert McGwier wrote: > > http://n4hy.org/20MeterBottom.png <http://n4hy.org/20MeterBottom.png> > http://n4hy.org/6MeterBottom.png <http://n4hy.org/6MeterBottom.png> > > shows the bottom end of 20meters and 6 meters (bottom 192 kHz). > > There is no comparison between the LO in the 5000 and the AD9851 found > in the SDR-1000. There are tiny spurs, evident in this picture. But I > am stealing, err uhh, copying, err uhh, analyzing and using the spur > elimination routines from linrad. ;-) The tiny spurs that are evident > in the 5000 are not numerous, they are more widely spaced than the > SDR-1000, primarily because of the much higher clock frequency. In > addition, the new DDS has essentially no clock leakage at subharmonics > of the main clock as compared to the AD9851 which as everyone will > remember, produced horrible spurs just above 50 MHz in the SDR-1000. I > picked these pictures not because they were the best but because they > show the bottom of the band. > > I have a beta radio, the front end and the exciter (QSE) have been > improved in the production radios, but the LO has not changed at all. > > My MDS on six meters with the preamp on is -126 dBm. This will not make > a 6 meter operator stand up and take notice. HOWEVER, the Flex 5000 > makes it utterly trivial, with no external switching required, to drop > in a preamp in the RX In / RX Out path. Its gain must be known to put > into a gain table so the radio remains calibrated. > > The Flex 5000 is a much cleaner receiver and there is simply no > comparison whatsoever in the QSE. The IMD is very good in the entire > amplification chain. However, we will be providing, after things > settle down on the release, a linearization button or check box. If > you remember the typical power curve, it is linear and then folds over > at the top as you near the max output. One can trivially invert that > curve. If in addition to this inversion, we do a little phase > correction in the TX filter, this will be a superbly clean transmitter, > with very small IMD. This will be especially important on digital modes > and for those that have power to burn in driving their amplifiers, this > will produce one of the cleanest sounding radios ever. > > WARNING: The algorithms mentioned here will not be in the 1.10 release. > They are to follow shortly after once they have been fully vetted as > functional and not harmful. I am certain they will be popular. > > Bob > N4HY > > Philip Covington wrote: > > On 8/8/07, Ken N9VV <[EMAIL PROTECTED] <mailto:n9vv%40wowway.com>> wrote: > >> I put together a few pictures of what the new packaging looks like. It > >> is solid and well thought out. There are surprises in the box. I know > >> you will be as thrilled as I was to receive your new FLEX-5000 > >> http://www.n9vv.com/FLEX-5000-arrives-N9VV.html > <http://www.n9vv.com/FLEX-5000-arrives-N9VV.html> > >> > >> First impressions: > >> ----------------- > >> o The rig is heavy and solidly built. I thought it would be about like > >> the SDR-1000. It is much more solid and has really professional > >> attention to details. > >> > >> o I never listened to WWV on 15Mhz because my Jupiter couldn't hear > >> it. I can now click through ALL the WWV stations on 2,5,10,15, and even > >> 20Mhz with the FLEX-5000. > >> > >> o The preamp comes on automatically on the higher bands and the audio > >> stays exactly where you put it for best listening. > >> > >> o Setup is so easy that you will think you missed something. Hook up > >> some powerpole connectors, your speakers, an antenna, and a Firewire > >> cable to your PC and you are all set to enjoy your new rig. There is no > >> more XG-1 signal level, image, or frequency adjustments! those > >> adjustments are all done at the factory now. > >> > >> o My new rig has been on PSK31 and CW and has not missed a beat. I > >> was always impressed with my SDR-1000. This second generation from Flex > >> easily surpasses it. > >> > >> o I believe SDR has finally turned the corner from a hardware > >> curiosity and experimental platform to a viable solid performer > that can > >> hold it's own against anything in the Ham market. > >> > >> all the best, > >> de ken n9vv > > > > I am sure there are many people as curious as I am: How does it > > perform on 10 and 6 meters? How many spurs are you seeing above 20 > > MHz? > > > > 73 Phil N8VB > > > > -- > AMSAT Director and VP Engineering. Member: ARRL, AMSAT-DL, > TAPR, Packrats, NJQRP, QRP ARCI, QCWA, FRC. ARRL SDR WG Chair > "If you're going to be crazy, you have to get paid for it or > else you're going to be locked up." Hunter S. 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