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VLF Projects - Receivers

Click to enlargeA LowFER Receiver Using a "Software" IF by KLR
This article describes a "software" receiver that uses a simple, low cost hardware downconverter in conjunction with sound-card software such as DL4YHF's "Spectrum Lab" or I2PHD's "SDRadio", which act as a tunable DSP-IF system.
http://www.qsl.net/k0lr/SW-RX/sw-rx.htm

A very simple VLF Pocket receiver by DJ1WF
The following receiver concept may give an idea how to build a tiny and sufficiently performant RX without using expensive filters.
http://www.vlf.it/fritz/pocketrx.html

Click to enlargeA VLF-LF receiver - 10kHz to 500 kHz with resistance tuning by VK5BR
The receiver design is a little different from the usual form. It has no variable capacitors or inductors except for one preset trimmer in a trap circuit. Tuning is carried out by a potentiometer, the resistance of which sets the frequency of the heterodyne oscillator.
http://www.robkalmeijer.nl/techniek/electronica/radiotechniek/hambladen/ar/1989/12/page10/index.html

Click to enlargeAn electro-mechanical RX for VLF by MBMU
It is basically a direct conversion receiver. It has a 2 pole passive preselector with RF bandwidth of about 800Hz, which also impedance matches the antenna to the mixer. The mixer uses saturating ferrite cores, in a way not unlike the SAQ keying circuit.
http://www.wireless.org.uk/mechrx.htm

Click to enlargeUsing a PC with soundcard as a VLF receiver by DL4YHF
This article describes how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum.
http://www.qsl.net/dl4yhf/speclab/vlf_rcvr.htm

Click to enlargeVLF/LF to 28.5 MHz Receiving Converter by DF3LP
This converter is one of my early projects. It is built using "ugly style" in a small metallic case usingBNC for in- and output connection including some internal shielding of the crystal oscillator.
http://www.qsl.net/df3lp/projects/lfconv/index.html

Click to enlargeVLF Receiver Using Saturable Ferrite Mixer by AA1TJ
The project took less than an hour; from original conception to working receiver. I'd been playing with a saturable magnetic AM modulator on the bench, when it occurred to me that my modulator ought to work as a VLF product detector.
http://web.archive.org/web/20101124023219/http://aa1tj.com/vlfreceiverwithsaturableferritemixer.html

Click to enlargeVLF Tube Receiver by IWBZD
The circuit described below has been designed to match the requirements above. As main feature, it works with a single 12V source. It can be also feed with a little Ni-Cd or Pb battery, like the ones used in most anti burglar systems. Due to its low power consumption the circuit is able to work for many hours.
http://www.vlf.it/accardo/vlf_Tube_eng.html

Click to enlargeVLF nach KW-Konverter durch DG7XO
Dieser Converter stammt von der Homepage http://www.radiosky.com ab.Ich habe dazu ein Layout fr ein OM aus unserem OV gemacht, dass ich auch hier zur Verfgung stellen mchte.
http://www.dg7xo.de/selbstbau/vlf2kw.html


Creation date : 07/10/2020 @ 21:04
Last update : 09/11/2020 @ 00:06
Category : VLF Projects
Page read 384 times


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