Hi Patrick, I don't know if I mentioned it during my and John Bryant's SDR radio talk at the Seaside convention last year, but the software-based radios can have highly impressive noise blanker operation.
I rarely have repetitive impulse noise here, but the SDR-1000's "intelligent" approach to handling noise pulses results in the best noise blanking I have ever heard in receivers...on the few occasions when this type of QRM has appeared. The radio puts the computer's CPU power to excellent use by identifying a noise pulse, sampling the "good" audio before and after the pulse, and then splicing a clone of the good audio back into the gap left when the spike was notched out. The restored audio is like "the noise never happened", assuming proper Threshold setup for the NB in the PowerSDR software. A characteristic I really appreciate is that the blanking action can work well on weaker impulse noise, not just ones that are strong compared to the desired audio. Buzzes and "hash" that cover up the signal for longer increments of time are more tricky to tame, but the PowerSDR software has a separate noise blanker designed more for longer impulse noise. Both can be used at the same time if desired. It would be interesting to see what this software could do with the electric fence noise you've been bothered by for years. I know you've tamed it pretty well by now, however, with the MFJ phaser and the Drake. 73, Guy Atkins Puyallup, WA ---------------------------------------------------------------------- Message: 1 Date: Sun, 6 May 2007 18:35:49 -0700 From: [EMAIL PROTECTED] (Patrick Martin) Subject: Re: [IRCA] SP 600 /R390 To: [email protected] (Mailing list for the International Radio Club of America) Message-ID: <[EMAIL PROTECTED]> Content-Type: Text/Plain; Charset=US-ASCII Unless the receiver has a good noise blanker, forget it. Plus I am so spoiled these days with memories, quick frequency changing, etc. Bill Block told me since buying his R8, he no longer uses his R390A much at all. It takes way to long to tune from one end of the dial to the other. 73, Patrick Patrick Martin KAVT Reception Manager _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
