VLF kit for a newbie

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u2r0
Posts: 3
Joined: Sun Mar 29, 2020 3:10 pm

VLF kit for a newbie

Post by u2r0 » Sun Mar 29, 2020 3:27 pm

Hi guys,
I am a totally newbie of this world and I am just immagining a point to begin!

So I am looking for a reasonably entry level (means cheap!) and already assembled kit for VLF

I've seen maybe this antenna to buy: https://www.ebay.it/itm/Antenna-attiva- ... SwT5tWJNzz

with this SDR dongle: https://www.rtl-sdr.com/buy-rtl-sdr-dvb-t-dongles/

to use on GNU/Linux

What do you think?

What do I need more? Do you recommend other stuff?

thanks

U.

alanzfq
Posts: 140
Joined: Thu Oct 04, 2018 11:18 am

Re: VLF kit for a newbie

Post by alanzfq » Sun Mar 29, 2020 4:22 pm

What do you mean by VLF?
"HF Direct Sampling Mode - Listen to 500 kHz - 24 MHz with direct sampling."
500Khz is not what many call VLF...
You must find someone that knows the antenna or get a honest write-up, if it overloads then it will be useless.
Alan

radiolistener
Posts: 76
Joined: Thu Jan 25, 2018 10:48 pm

Re: VLF kit for a newbie

Post by radiolistener » Wed Apr 08, 2020 12:27 am

You're don't need SDR receiver for VLF.
Just connect antenna to the audiocard input and use HDSDR.
It works great with dynamic range up to 140 dB.

If you use 192 kHz audiocard it will give you 192/2=96 kHz bandwidth, so you will be able to listen any frequency within 0 Hz to 96 kHz range.

If you use 384 kHz audiocard it will give you 384/2=192 kHz bandwidth.

24 bit sound card give you almost 24*6 = 144 dB dynamic range.

This is very good performance for VLF receiver.

In order to improve sensitivity and selectivity you can use lowpass or bandpass filter and low noise amplifier.

u2r0
Posts: 3
Joined: Sun Mar 29, 2020 3:10 pm

Re: VLF kit for a newbie

Post by u2r0 » Thu May 07, 2020 2:45 pm

thank you for your tip, unfortunately I am on gnu/linux or Os X. I've seen HDSDR is just for Windows, I will try to use it with Winehq.

u.

alanzfq
Posts: 140
Joined: Thu Oct 04, 2018 11:18 am

Re: VLF kit for a newbie

Post by alanzfq » Fri May 08, 2020 7:04 am

I'm told HDSDR will run with Wine but possibly no need to use Wine.
There are other SDR programs that are Linux only.
Again I'm told HDSDR will run on a Mac. But there are some MAC programs, DSP Radio was one.
Look for those.
Alan

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