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Re: LF: Re: [rsgb_lf_group] SDR dongles and ferrite rods / loops ?

from [Andy G0FTD] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: Re: [rsgb_lf_group] SDR dongles and ferrite rods / loops ?
From: Andy G0FTD <[email protected]>
Date: Sat, 1 Sep 2018 14:22:26 +0100
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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 <[email protected]> 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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