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From: Andy G0FTD <punkbiscuit@googlemail.com>
Date: Sat, 1 Sep 2018 14:22:26 +0100
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To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: [rsgb_lf_group] SDR dongles and ferrite rods / loops ?
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Hi Roelof,

Thanks for the good news ;-)

I have a few dongles here.

I am waiting for an "official" V3 dongle from RTL.COM, and I also have one
of those dongles that have been put into
a bigger box with 2 x SMA connectors.

I have only used this on 7Mhz so far.

So with this good news I ight be able to produce a 476Khz grabber, RTL
Dongle and Raspbery Pi P, hide it away and just let it
run.

I was initially thinking of a 2.5m square loop, tuned with capacitance (I
was not sure if this would be good enough
without a pre-amp), or maybe a large ferrite rod and pre-amp.

Of course, this assumes anyone want's to use much QRSS these days.

I am of course a big QRSS fan here, but on HF. ( I am also admin to
http://www.swharden.com/qrss/plus/ website).

I wonder how is the impedance on the V3 dongle - 50R or other ?

73 de Andy G0FTD


On Sat, 1 Sep 2018 at 13:52, Roelof Bakker <roelof@ndb.demon.nl> wrote:

> Hello Andy,
>
> I have used a RTL-SDR.Com V3 dongle running in direct sampling mode under
> SDR#.
>
> You should be aware that it lacks sensitivity at LF and is prone to
> overload from Medium Wave
> broadcast stations. A tuneable pre-amplifier will take care of these
> problems.
>
> Though only 8 bit, with correct gain distribution results are excellent
> when using a suitable
> antenna. I have used it with a mini-whip and also with a triangle 10 meter
> circumference
> 'large aperture' loop, feeding a LZ1AQ amplifier.
>
> 73,
> Roelof Bakker, pa0rdt
>
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Roelof,</div><div><br></div><div>=
Thanks for the good news ;-)</div><div><br></div><div>I have a few dongles =
here.</div><div><br></div><div>I am waiting for an &quot;official&quot; V3 =
dongle from <a href=3D"http://RTL.COM">RTL.COM</a>, and I also have one of =
those dongles that have been put into</div><div>a bigger box with 2 x SMA c=
onnectors.</div><div><br></div><div>I have only used this on 7Mhz so far.</=
div><div><br></div><div>So with this good news I ight be able to produce a =
476Khz grabber, RTL Dongle and Raspbery Pi P, hide it away and just let it<=
/div><div>run. <br></div><div><br></div><div>I was initially thinking of a =
2.5m square loop, tuned with capacitance (I was not sure if this would be g=
ood enough</div><div>without a pre-amp), or maybe a large ferrite rod and p=
re-amp.</div><div><br></div><div>Of course, this assumes anyone want&#39;s =
to use much QRSS these days.</div><div><br></div><div>I am of course a big =
QRSS fan here, but on HF. ( I am also admin to <a href=3D"http://www.swhard=
en.com/qrss/plus/">http://www.swharden.com/qrss/plus/</a> website).</div><d=
iv><br></div><div>I wonder how is the impedance on the V3 dongle - 50R or o=
ther ?</div><div><br></div><div>73 de Andy G0FTD<br></div><div><br></div></=
div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Sat, 1 Sep 201=
8 at 13:52, Roelof Bakker &lt;<a href=3D"mailto:roelof@ndb.demon.nl">roelof=
@ndb.demon.nl</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hello =
Andy,<br>
<br>
I have used a RTL-SDR.Com V3 dongle running in direct sampling mode under S=
DR#.<br>
<br>
You should be aware that it lacks sensitivity at LF and is prone to overloa=
d from Medium Wave <br>
broadcast stations. A tuneable pre-amplifier will take care of these proble=
ms.<br>
<br>
Though only 8 bit, with correct gain distribution results are excellent whe=
n using a suitable <br>
antenna. I have used it with a mini-whip and also with a triangle 10 meter =
circumference <br>
&#39;large aperture&#39; loop, feeding a LZ1AQ amplifier.<br>
<br>
73,<br>
Roelof Bakker, pa0rdt<br>
<br>
</blockquote></div>

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