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HF Propagation


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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.

Click to enlargeA 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.

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.

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.

Click to enlargeRicevitore VLF Valvolare da IWBZD
Nel percorso di ricerca nellambito delle VLF ed SLF, mirato alla ricezione estrema dei segnali di origine geologica, ho sempre adottato, nel corso degli anni, innumerevoli soluzioni sempre pi innovative ed al passo con la tecnologia.

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.

Click to enlargeVLF/LF to 28.5 MHz Receiving Converter by DF3LP
This converter is one of my early projects and I'm not able to count all steps of reconstruction over the past 18 years. When 137 kHz became available here in Europe in 1998 I fished this old-timer out of the junk box.

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.

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.

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.

Creation date : 07/10/2020 @ 21:04
Last update : 17/02/2021 @ 14:09
Category : VLF Projects
Page read 1183 times

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