VLF - LF Up-Converter

VLF-LF <5KHz to 500KHz Up-Converter

Since many countries are allocating the 472 KHz band for experimental use by Radio Amateurs, a growing number of them as well as listeners have become interested on VLF and LF bands.

The fact that few radios are available on the market covering properly frequencies from below 5KHz to 500KHz, convinced us to provide radio amateurs and listeners with the high-performance receiving VLF-LF Converter that we introduce here.

The VLF-LF Up-Converter extents the range of any shortwave receiver to below 5 KHz to 500 KHz.
It is connected between the antenna and a shortwave radio receiver. When it is power-on the <5KHz to 500 KHz band segment is translate to 3.500MHz to 4.000MHz, Model-350 or 4.000MHz to 4.500MHz, Model 400, allowing the reception of VLF and LF bands.

For example, if a conversion frequency of 4.000MHz - 4.500MHz, Model 400, is used, and the receiver tuned on 4.135.500MHz, you are receiving on 135.500KHz, just ignoring the digit “4” on the dial.

Alternatively most SDR radio control software lets customise the dial by the user, in this regard see below PowerSDR configuration.

The VLF-LF Up-Converter enables reception of VLF mobile maritime communications, aviation and marine navigational aids such as NDB and DGPS beacons, DGPS reference stations, NAVTEX, Standard Time & Frequency stations, LF Amateur bands, European LW broadcast stations, monitoring the sounds of nature created by planet Earth (Natural Radio) such as sferics, hiss, tweaks, whistlers, Dawn Chorus, other not well known VLF radio atmospheric sounds, and many more.

Specifications:

- Type: Superheterodyne converter. Double balanced mixer; Quartz crystal oscillator.

- Frequency range: <5KHz to 500KHz.

- IF output: 3.5MHz-4MHz, model 350; 4MHz-4.5MHz; model 400.

- Input/Output impedance: 50 Ω

- Gain: 5 dB

- IF rejection: 110dB typical.

- MW band rejection: 80dB

- Crystal oscillator: Low phase noise; quartz crystal ±10ppm;
   3.5MHz or 4MHz, fundamental.

- Power: 12volts/40mA

http://www.herostechnology.co.uk/pages/VLF_LF_Converter.html

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