Re: [IRCA] 738 Taiwan's Ragged Carrier Revealed in Perseus

[Guy Atkins <dx@xxxxxxxxxxxxx>]

Hi Gary,

Thanks for posting the MP3 of Taiwan's 738 audio as heard on your
ultralight. Wow, I certainly haven't heard anything like that buzz on 738
over on this side of town! I'd suggest that maybe it's local QRM in your
vicinity, but I know Bruce, Walt, and John have heard the buzzy audio too.

That's a possibility about Perseus being more immune to the noise, but the
three guys mentioned above all have SDR receivers too. I don't think there's
anything special about Perseus compared to Bruce's SDR-IQ or John's WinRadio
that would cause the buzz to disappear or be "filtered out". The noise
blanker in Perseus works well and has two effective blanking widths, but I
rarely turn it on. The noise reduction control is used more often, but I
know I haven't tried it on Taiwan 738.

73,

Guy Atkins
Puyallup, WA
http://fivebelow.squarespace.com





> Date: Mon, 21 Sep 2009 00:50:34 EDT
> From: D1028Gary@xxxxxxx
> Subject: [IRCA] 738 Taiwan's Ragged Carrier Revealed in Perseus
>        Waterfall ...
>
> Hi Guy,
>
> Thanks very much for posting the photo of the Perseus' waterfall display of
>  the 738-Taiwan "ragged carrier."
>
> For some reason, the 738-Taiwan audio (on your Perseus  SDR) in the MP3
> clip sounds much more normal than the typical  738-Taiwan audio received
> here
> on the C.Crane SWP ultralight. Maybe the Perseus  filtering removes some of
> the noisy components of the impaired signal. I posted  an MP3 of
> 738-Taiwan's
> signal here this morning (of the same approximate signal  strength as your
> MP3) in the Ultralightdx sound file  site, which includes a definite
> buzzing
> sound in the background of the  Chinese conversation. This buzzing sound
> doesn't show up on the other TP's,  except of course for the North Koreans.
>
> 73, Gary
>
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