Re: [IRCA] Bizarre FSL Antenna Shootout (Part 2)

[Chuck Hutton <charlesh3@xxxxxxx>]

Gary - 

Being a PL-380 owner, I'm hoping there's an ounce of cure. Is there any idea why the het appears on 603? And at least to me it's unknown whether there are hets on other frequencies.

I don't see any spec for the notch bandwidth in the Timewave. The CW filter bandwidth is specified and happens to be 5 Hz.

Chuck

________________________________________
From: IRCA <irca-bounces@xxxxxxxxxxxxxxxx> on behalf of d1028gary@xxxxxxxxxxx <d1028gary@xxxxxxxxxxx>
Sent: Friday, March 18, 2016 10:47 PM
To: America, Mailing
Subject: [IRCA] Bizarre FSL Antenna Shootout (Part 2)

Hello All,

Posted previously was a direct MP3 comparison of the relative reception capability during the exact same minute in receiving a weak-signal TP (603-HLSA) by a 15" FSL antenna inductively coupled to a CC Skywave model
(a $1000+ combination, posted at https://app.box.com/s/xq7bs7nvptf0d5ts1vxzli0izqza2ncf  )

and a new stand-alone 3" FSL Tecsun PL-380 model (a $95 modified pocket radio, with a hard-wired 3" FSL antenna) posted at
https://app.box.com/s/4r27auio85caqadccsyb8pwcatw5rku0

There is a little more to the story, however. Although the modified PL-380 does generate somewhat of a heterodyne on 603, this type of issue is easily corrected by a DSP signal processor (such as the Timewave DSP 599zx), which is routinely used to remove TP heterodynes from DXpedition MP3's recorded on pocket radios. When this is done (filtering the 740 Hz heterodyne with a 5 Hz notch filter), the 3" FSL Tecsun PL-380's signal ends up sounding like this:
https://app.box.com/s/bcj3ap8g0tefie0ku903z28g5njtrfgc

When comparing this "Science Fiction PL-380" signal with that of the inductively coupled 15" FSL (which already has a stellar DXpedition record on the lower frequencies at Rockwork 4), the implications are pretty obvious. Five of these little monsters covering different high priority frequencies at an ocean cliff site could dramatically increase the effectiveness of Ultralight transoceanic DXing.

73, Gary DeBock (in Puyallup, WA, USA)








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