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Low Frequency radio operations VLF ELF, longwave links
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- Antenna Noise and Signal Cancelling at LF
- By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
- Longwave Home Page
- The World of Radio Below 500 kHz by the Longwave Club of America
- An easy loop for VLF
- An easy VLF loop, 200Hz-20kHz reception without transformers by Renato Romero and Marco Bruno
- Long Wave Radio
- Dedicated to 136 Khz band by G3YXM includes news, links and software useful for LF working.
- VLF Loop Antenna
- A project on building a VLF loop antenna
- Antennas for 136kHz
- A very long and exaustive documentation on building antennas for 136 khz. Includes links to antenna design software for longwave
- VLF-LF And the Loop Aerial
- The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise. A Loop Aerial is described suitable for use on the LF and VLF bands together with a circuit of an interface loop tuner and preamplifier. The discussion extends to the problems of amplifier noise and the advantages of tuning the loop.
Alphabetical
- 136KHz portable station
- 136kHz portable station project by PA4VHF, Dick
[Hits: 265 | Votes: 0 | Rating: 0.00] - A LF power amplifier
- A Low Frequency (LF) RF Power Amplifier by VK5BR it operates in a linear mode and can handle CW, AM and SSB.
[Hits: 88 | Votes: 0 | Rating: 0.00] - A VLF loop by IK0VVE
- This antenna was born from the demand to use a loop for vlf operations in portable posting, avoiding the aid of long wires to stretch.
[Hits: 684 | Votes: 1 | Rating: 5.00] - Amrad LF operatoins
- Lot of useful information on experiments on 136 Khz band, with antenna tips DSP infos and notes on their activity in LF.
[Hits: 848 | Votes: 4 | Rating: 9.00] - An easy loop for VLF
- An easy VLF loop, 200Hz-20kHz reception without transformers by Renato Romero and Marco Bruno
[Hits: 2297 | Votes: 2 | Rating: 1.00] - Antenna Noise and Signal Cancelling at LF
- By using the signals from two antennas, controlling their relative amplitudes and controlling the phase of one of them, unwanted signal or unwanted noise can be phased out. Circuitry is described which uses the signal from a wire antenna to provide selective cancelling against the signal output from an LF loop antenna.
[Hits: 3312 | Votes: 2 | Rating: 5.50] - Antenna Noise and Signal Cancelling at LF
- The fact that the phasing between a wanted signal and an unwanted signal can be different on different antennas is put to advantage. With this condition, the unwanted signal can be cancelled out by controlling amplitude and phase. The heart of the system is some form of phase control circuitry.
[Hits: 181 | Votes: 0 | Rating: 0.00] - Antennas for 136kHz
- A very long and exaustive documentation on building antennas for 136 khz. Includes links to antenna design software for longwave
[Hits: 1668 | Votes: 1 | Rating: 5.00] - Build a 136 kHx TX
- Two versions of a 350 and 900 W output TX for longwave by G3YXM
[Hits: 95 | Votes: 0 | Rating: 0.00] - CEPT ERC 136 Khz Recommendation
- Use of the band of 135.7-137.8 kHz by the amateur service
[Hits: 447 | Votes: 0 | Rating: 0.00] - DK8KW Longwave Information
- Useful pages of longwave operations, includes a lot of reference files, beacons list, sounds and pictures
[Hits: 848 | Votes: 1 | Rating: 8.00] - Experimental Vertical for 136 Khz
- Longwave experimental 136kHz Vertical Antenna at G3YMC
[Hits: 323 | Votes: 0 | Rating: 0.00] - Frequency Calibration for Weak Signal Work
- Accurate calibration of your receiver and sound card is necessary for good results with the weak signal modes in use at LF. Modern receivers with master oscillators that are synthesized to provide all conversion frequencies greatly simplify the process. This article describes a method of making the necessary measurements and adjustments to an ICOM R75 receiver and a sound card, using the ARGO software
[Hits: 286 | Votes: 1 | Rating: 7.00] - Introduction to Longwave Radio
- A brief introduction to longwave radio
[Hits: 1039 | Votes: 5 | Rating: 6.60] - Keyboard Modes for 600 Meters
- Evaluation of various operating modes on 600 meters
[Hits: 29 | Votes: 0 | Rating: 0.00] - LF Sound Gallery
- Sounds from the 136 kHz band
[Hits: 60 | Votes: 1 | Rating: 1.00] - LF SWR
- The circuit for the VSWR Meter is by no means original, but it is probably one of the most useful accessories. Constructed from parts collected at Radio Rallies, the total cost was USD 12
[Hits: 1026 | Votes: 2 | Rating: 6.50] - Loading Coil for 136 kHz
- Pictures of loading coils according to OK1FIG
[Hits: 80 | Votes: 0 | Rating: 0.00] - Long Wave Radio
- Dedicated to 136 Khz band by G3YXM includes news, links and software useful for LF working.
[Hits: 2008 | Votes: 11 | Rating: 6.45] - Long Wave Radio
- The World of LF, by G3YXM reference site for longwave operations. Introduction to operating on 136 and 501 Khz
[Hits: 45 | Votes: 0 | Rating: 0.00] - Longwave Home Page
- The World of Radio Below 500 kHz by the Longwave Club of America
[Hits: 2627 | Votes: 3 | Rating: 8.67] - Longwave operations
- In the VLF portion of the spectrum it is easy to listen to the emissions created by the Earth itself. These emissions are generated by many different mechanisms and are often beautiful to listen to. Coverage on LF and MF frequencies
[Hits: 237 | Votes: 0 | Rating: 0.00] - Low Frequency operations by W3EEE
- A squint at the world of LF
This website was initially thrown together to provide ready availability to data being collected from the measurement of a transatlantic LF (Low Frequency) path.
[Hits: 27 | Votes: 0 | Rating: 0.00] - Low Frequency Transmission Modes
- Article by W1TAG on operating modes used on low-banding.
The 2200 meter band (135.7 - 137.8 kHz) is only 2.1 kHz wide, so voice work on SSB or AM is out. Find out the best modes on LF
[Hits: 31 | Votes: 0 | Rating: 0.00] - LowFER MedFER HiFER
- What's all this stuff about LowFERs, MedFERs and HiFERs? What Is 'Part 15?'
[Hits: 77 | Votes: 0 | Rating: 0.00] - PICBeacon
- LF (and not only...) CW/QRSS beacon
[Hits: 499 | Votes: 2 | Rating: 10.00] - Radio waves below 22 kHz
- Exploring ULF-ELF and VLF radio band
[Hits: 486 | Votes: 3 | Rating: 6.33] - Really Low Frequency Operating
- The world below 500 kHz (The wavelength is 1500 meters or just about a mile) has a number of interesting listening and communications opportunities with possibly more to come.
[Hits: 309 | Votes: 2 | Rating: 3.50] - RSGB HF Committee
- LF Band activities section
[Hits: 312 | Votes: 0 | Rating: 0.00] - VLF Loop Antenna
- A project on building a VLF loop antenna
[Hits: 1966 | Votes: 0 | Rating: 0.00] - VLF Natural Radio Discussion Group
- Discussion group dedicated to those who enjoy monitoring radio frequencies in the VLF radio spectrum and slightly below the VLF spectrum (3-30 KHz).
[Hits: 670 | Votes: 1 | Rating: 8.00] - VLF Time Signal Broadcasts
- Station List Compiled by William Hepburn, LWCA
[Hits: 1018 | Votes: 4 | Rating: 4.00] - VLF-LF And the Loop Aerial
- The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise. A Loop Aerial is described suitable for use on the LF and VLF bands together with a circuit of an interface loop tuner and preamplifier. The discussion extends to the problems of amplifier noise and the advantages of tuning the loop.
[Hits: 1360 | Votes: 1 | Rating: 10.00] - W1TAG WD2XES WE2XGR/3
- Experimental Stations Run by W1TAG
WD2XES has been used to study LF antenna design, propagation and communication modes. Signals from WD2XES have been copied as far away as Russia.
[Hits: 36 | Votes: 0 | Rating: 0.00] - W4DEX Experimental Stations
- WD2XSH Experimental Station (505 - 510 KHz)
WD2XKO Transmitting Station Stanfield,NC operating between 135.7 to 137.8 KHz.
[Hits: 31 | Votes: 0 | Rating: 0.00] - WD2XGJ Experimental Station
- Experimental Longwave Transmissions from Tower Hill
wayland Massachusetts
Operator Name Warren, Ham Call K2ORS, Frequency: 137.7796 KHz
[Hits: 35 | Votes: 0 | Rating: 0.00] - Working on 136 Khz
- Operating practices on 136kHz
[Hits: 150 | Votes: 0 | Rating: 0.00]
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