Re: [IRCA] ââ"Science Fiction PL-380"-- Pest Control Version

[Russ Edmunds <wb2bjh@xxxxxxxxx>]

This isn't much different from comparing a 'traditional' tuned air core
loop to a similarly sized
broadband loop. The signal strength on peak is very different, however the
tuned loop also
is better at nulling, in part at least due to design differences. The
broadband loop of course
can be used with an SDR without retuning. ( I don't know of anyone who has
reported on using
a tuned air core loop with an SDR.



Russ Edmunds
15 mi NW Phila
Grid FN20id
<wb2bjh@xxxxxxxxx>

AM: Modified Sony ICF2010's (2) barefoot w/whip
FM: Yamaha T-80 & T-85, each w/ Conrad RDS Decoder;
Onkyo T-450RDS; Tecsun PL-310 ( 2);
modified Sony ICF2010 w/APS9B @ 15';
Grundig G8 w/whip; modified Sony ICF2010 w/whip


On Sat, Jan 23, 2016 at 11:16 PM, Guy Atkins <dx@xxxxxxxxxxxxx> wrote:

> Hi Walt,
>
> To my knowledge no one has perfected a broad band FSL that works with
> anything close to the performance of a single channel, carefully peaked
> version. This has often been a topic of discussion between Gary and myself.
> The broad band FSL I made a few years ago in the end turned out to be FAR
> below the sensitivity of a tuned FSL. This FSL used a Wellbrook FLG100
> module as a matching device and amplifier. In use at home I thought it was
> working well, but on a DXpedition it was sorely lacking vs. a Wellbrook
> 1-meter active broad band loop.
>
> Different matching ratio transformers have been tried without much success.
> A tuned FSL is like any other inductively coupled loop in that it's a
> resonant circuit, and gain goes up sharply at the expense of bandwidth...
> not of much use for broad spectrum SDR captures!
>
> 73,
>
> Guy Atkins
> Puyallup, WA
>
>
>
> > ---------- Forwarded message ----------
> > From: Walter Salmaniw <canswl@xxxxxxxxx>
> > To: Mailing list for the International Radio Club of America <
> > irca@xxxxxxxxxxxxxxxx>
> > Cc:
> > Date: Sun, 24 Jan 2016 01:52:37 +0000
> > Subject: Re: [IRCA]
> > ââ
> > â"Science Fiction PL-380"-- Pest Control Version
> > Fellas, I'm interested again with the removal of the variable tuning
> > capacitor and use for broad spectrum Perseus SDR captures.  As you
> recall,
> > a number of these early large units were kindly built by Gary.  One was
> > sent my way (and I may have the same in Masset).  Results have been
> > variable.  Would anything different be done with these units compared to
> > what we know today?   73,...Walt
> >
> >
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