Re: [IRCA] Perseus Vs. RF Space SDR-IQ

["Guy Atkins" <dx@xxxxxxxxxxxxx>]

Hi Les,

Walt Salmaniw can tell you about the SDR-IQ vs. Perseus, as he owns both
receivers. I'll mention that the RFSpace receivers are more like laboratory
test equipment in their operation, and in some ways not useful for quick and
easy DXing as Perseus. However, Perseus definitely has its quirks and issues
too! These advanced receivers are in their infancy, and it will be exciting
to see what the next few years will bring as SDRs mature and become more
polished.

MW Splatter Rejection is a new feature introduced in Perseus (beta version)
that helps reduce splatter from an adjacent channel signal that is
overlapping your desired station. Using the number-crunching power of the
computer, this feature takes the opposite "clean" sideband of the QRMing
station and uses it in a phase-inversion fashion to subtract the splatter
from the DX signal. A description of how it works is found here:
http://microtelecom.it/perseus/amrej.html  After becoming familiar with the
steps, it takes just a few seconds to activate the feature on a signal. The
limiting factor to success, I believe, is multipath distortion that may be
present on the QRM signal. The times I've been successful with this new
feature, it has worked very well. Other times...nada.

There is a WAV file of an early version (experiment) of MW *co-channel*
interference supression available to listen to. It is found on the Perseus
SDR Yahoogroup in the files section. This recording was made by the designer
of Perseus, Nico Palermo, while he experimenting with co-channel supression
techniques, all in software. The new tool in Perseus is for *adjacent*
channel splatter interference. It's not known yet if we will see the
co-channel supression feature in a future version of the receiver software.

73,

Guy Atkins
Puyallup, WA USA
www.perseus-sdr.blogspot.com


-----Original Message-----
From: Les Rayburn [mailto:les@xxxxxxxxxxxxxxxx]
Sent: Wednesday, July 02, 2008 1:09 PM
To: dx@xxxxxxxxxxxxx; irca@xxxxxxxxxxxxxxxx
Subject: Re: [IRCA] Perseus Vs. RF Space SDR-IQ


I'm an owner of the RF Space SDR-IQ, and have been very impressed with it's
capabilities. It easily compares to any high end MW receiver that I've ever
owned including the Drake R8B and AOR 7030.

Been following the news of the Perseus, and would love to hear more about
the "MW Splatter Rejection" feature. What is it? How well does it work?

Also, I'd love to hear someone compare the SDR-IQ with the Perseus in
regards to MW DXing...

73,


Les Rayburn, director
High Noon Film
100 Centerview Drive Suite 111
Birmingham, AL 35216-3748
205.824.8930
205.824.8960 fax
205.253.4867 cell


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