----- Original Message ----- Toby Deinhardt wrote: > > I hope you don't mind my being at slightly sceptical that a low pass > filter is enough for serious LW/MW work. If one has a medium wave or long > wave broadcast stations in the vicinity, then additional filtering will > almost surely be needed.
Hi Toby, My statement was meant as a general reply regarding the filtering on the front end of the Perseus in view of the fact that the original post was referring to erroneous Blocking Dynamic Range numbers and stating that additional filtering would be required. Since I knew for weeks that the figures that were published were not correct, I was merely pointing out that the Perseus does contain excellent preselector filters. I have been monitoring the Perseus reflector for approximately 8 months and the Perseus has become the receiver of choice for serious LW/MW listeners. I have not seen one comment regarding additional filtering being required in any situation. Believe me, the LW/MW DX'ers are just as passionate about their hobby as we are about Ham Radio. With the Perseus's ability to display in real time and record 1600 kHz at one time and then play it back and tune through the recorded B/W as if it was happening in real time, I'm sure these guys have gained many hours of needed sleep. You may want to check out the Perseus reflector on Yahoo to get a feel for what is happening in the Perseus world. http://groups.yahoo.com/group/perseus_SDR/ as well as Guy Atkins site Five Below MW and Tropical band DXing with the Perseus http://perseus-sdr.blogspot.com/. > Also it will be interesting to read how well the IMD behavior of the SW > front end filters themselves in such a small enclosure is. Small sized > toroids can, from what I know, be a weak point in a receiver with high > dynamic range. I will let the above comment for the experts since I surely am not one of them. > > From what I've heard radios such as the Perseus appear indeed to be very > interesting but as always, a new technology, like good wine, needs time to > mature. With over 1,000+ Perseus's now in use world wide, I think it has come along quite nicely. Like the K3, the Perseus is an ever evolving work of art. BTW since this originally started out as using a Perseus as a 2nd receiver. I have used the Perseus as a 2nd receiver and also as an IF band scope with the K3. For me, it's a good combination. As I said previously, I own both a Perseus and a K3 and respect the great accomplishments that have been made by Elecraft, Nico at Microtelecom, Flex Radio, Phil Covington, Ten-Tec and the guys who started us over 11 years ago down a new path ......Kachina. If I missed anyone, please accept my apologies. 73 Gerry K3MKZ
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