low frequency

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Search Results for "low frequency"

70 links - and 2 categories

Antennas
  • Constructing a LowFER Antenna - This article describes the antenna for Low Frequency Beacon. It originally appeared in the "Lowdown" for Oct. 1999.
    [ Hits: 1222 | Votes: 2 | Rating: 5.50 ]
  • Tenna Dipper Kit - The "Tenna Dipper" is a low power antenna analyzer and ATU tuning aid. With this handy accessory, you can determine the 50 Ohm resonance frequency of antennas or you can adjust your antenna tuner for a 50 Ohm match without generating QRM
    [ Hits: 3682 | Votes: 3 | Rating: 4.00 ]
Antennas : Feed Lines
  • Transmission Lines - Whenever you choose a coax feedline, the frequency of operation is a very important consideration. Over the operating bandwidth of the coax the VSWR is low, typically 1.2:1 or better. Insertion loss is also an important parameter. It is usually specified in dB/foot and is a linear relationship.
    [ Hits: 1127 | Votes: 0 | Rating: 0.00 ]
  • Build An LF Antenna Analyzer - A Portable Low Frequency Antenna Analyzer, For those of us who like to play with antennas on the ham bands, one of the handiest tools to have around the shack is an "antenna analyzer". These gadgets combine a signal generator and standing-wave ratio (SWR) sensor in a small battery-powered unit.
    [ Hits: 4134 | Votes: 2 | Rating: 5.00 ]
Antennas : Vertical
  • Quarter Wave with radials - VHF quarter wave antenna mainly for scanner usage, The quarter wave antenna is an easily designed and constructed antenna for whatever frequency you want, although with the following design, you may to limit it to the VHF and UHF bands due to the physical size.
    [ Hits: 7245 | Votes: 5 | Rating: 7.20 ]
Manufacturers : Accessories
  • Radio Filters.Com - Low Cost FM Notch Filters: Radio Filters.com, manufactures frequency control products including band pass, notch, reject, electronic filters
    [ Hits: 666 | Votes: 6 | Rating: 6.83 ]
Manufacturers : Amplifiers
  • SSB Electronic USA - manufactures and distributes HF, VHF, UHF and SHF equipment covering 10MHz. - 47.0GHz. Our products include: Wireless LAN / WAN Bidirectional Linear Amplifiers, Low Noise Preamplifiers - LNA's, RF Linear Amplifiers, Relays, Transverter Systems, Frequency Translation Systems, Downconverters, Antennas, Parabolic Dishes, Coaxial Cable, Relays, Antenna Switches, Microwave Test equipment, PC controlled Receivers, Microwave Linear Amplifiers including models for Telemetry, Wireless, and CDMA applications.
    [ Hits: 7337 | Votes: 5 | Rating: 7.00 ]
Manufacturers : Antennas : HF
  • Valcom Fibreglass Whip Antennas - Manufacturer of Fibreglass Whip Antennas, Low and mediun Frequency, HF and VHF Antennas Specialized in the design and manufacturing of a full range of Beacon (MF), AM Broadcasting 540 - 1700 KHz, HF 1.7 to 30 MHz, VHF 30 to 156 MHz and UHF 200 to 500 MHz antennas.
    [ Hits: 2979 | Votes: 2 | Rating: 8.00 ]
Manufacturers : Microwave
  • Low Power Radio Modules - Low power radio modules - supplying rf modules, rf transceivers, radiometrix transmitters receivers, low power radio modules, scada, frequency hopping, 900 mhz, wireless data transmission, data telemetry, gps modules & receivers and more
    [ Hits: 585 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Test Equipment
  • Spectrum Instruments - Spectrum manufactures very high-performance, low-cost, GPS-disciplined time and frequency reference standards for industry, scientific, calibration, broadcast and amateur operators.
    [ Hits: 305 | Votes: 1 | Rating: 10.00 ]
Operating Modes : DSP
  • Olivia - The Olivia transmission system is constructed of two layers: the lower, modulation layer is an (almost) classical Multi-Frequency Shift Keying (MFSK) and the higher layer is a Forward Error-Correcting (FEC) code based on Walsh functions.
    [ Hits: 1279 | Votes: 1 | Rating: 3.00 ]
Operating Modes : Longwave
  • 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: 691 | Votes: 3 | Rating: 5.67 ]
Radio Equipment : HF Transceivers : Icom IC-746
  • Low cost frequency stabilisation - The Icom IC-746 is quite a popular HF/VHF multimode transceiver which has one shortcoming in its standard configuration when used to operate modes requiring good medium-term frequency stability.
    [ Hits: 1523 | Votes: 1 | Rating: 5.00 ]
Radio Scanning : Police Scanning
  • Frequency Guide Victoria - A site for every scanner enthusiast but especially for people living or visiting the lower Vancouver Island Area and Victoria B.C. Canada. This page has pictures with aerial pictures.
    [ Hits: 3749 | Votes: 12 | Rating: 5.75 ]
Shopping and Services : Regional : Europe : UK
  • BB Shopping UK Distributor of PMR 446 Priority listing - We stock a range of two way PMR446 radios. PMR 446 is a license free frequency, which means that you can communicate for up to 3km (terrain allowing) without any call charges or license requirements. They can be used in most European countries and are ideal for holiday trips.
    [ Hits: 381 | Votes: 1 | Rating: 10.00 ]
Software : APRS
  • APRS-Beacon - The purpose of the APRS-Beacon is to provide simple APRS-compatible position beacons for up to three Objects. It is designed to 'stand alone' and does not monitor other traffic on the frequency. It can use a single-port TNC (in 'native' mode), a single- or dual-port TNC in Kiss mode or the AGW Packet Engine in order to transmit on up to four radio ports.(When running with AGWPE, APRS-Beacon will also work with Windows 2000)
    [ Hits: 2793 | Votes: 5 | Rating: 2.80 ]
Software : DSP
  • SignalGen - SignalGen is a free (GPL) Linux (Xwindows GUI-based) utility that generates relatively low frequency signals with the use of a PC sound card. It is an entirely suitable replacement for a hardware signal generator if one doesn't require signals of a frequency higher than about 50 KHz. SignalGen creates any frequency between a fraction of one Hertz and an upper limit determined by your sound card's capabilities.
    [ Hits: 1474 | Votes: 2 | Rating: 10.00 ]
Software : Macintosh
  • iSpectrum Analyzer - Macintosh audio spectrum analyzer that allows the user to view live audio in a standard frequency plot, a stereo oscilloscope view and a waterfall display
    [ Hits: 6217 | Votes: 3 | Rating: 6.67 ]
Software : Radio Control
  • TH-D7 control program  updated - This software allows you to control TH-D7 radio functions in real time, using a windows interface. This software will graph current activity of any 4mhz range, allowing the user to mouse click any active portion - automatically changing the radios frequency.
    [ Hits: 5852 | Votes: 19 | Rating: 5.78 ]
  • RigResident - RigResident is a small program for RIG control, which does allow to set and read data of connected tranceiver (frequency, mode etc). RigResident supports more than 70 TRX models from ICOM, KENWOOD, YAESU and Ten-Tec.
    [ Hits: 3107 | Votes: 4 | Rating: 7.10 ]
Software : Spectrum analyzers
  • SpectraScope - SpectraScope is a simple Windows interface program allowing your computer to view up to two audio waveforms in either the time or frequency domain. The program is a Windows soft panel operating as a dual channel oscilloscope and spectrum analyzer. The useful frequency of operation is 20 to 10,000 Hz in the time domain and 20 to 20,000 Hz in the frequency domain. The program uses the computer sound card to capture the audio input.
    [ Hits: 10298 | Votes: 3 | Rating: 7.00 ]
Software : Utilities
  • Defpom's CB Radio Simulator - It is a application which can be used for troubleshooting CB radio faults, by giving a graphical display of the normal operating frequencies generated by various parts of the CB radios circuits, it can help you identify if a frequency is incorrect or even missing. Another good use for this software is simulating possible frequency expansions, as it allows you to choose any frequency that the PLL is capable of generating, so you can see what the radio will allow you to get !
    [ Hits: 1347 | Votes: 1 | Rating: 10.00 ]
Technical Reference : Frequency Counter
  • 40MHz Frequency Counter Module - Design for a very low cost 6-digit frequency counter module using of the shelf components
    [ Hits: 1718 | Votes: 4 | Rating: 3.50 ]
Technical Reference : Radio Frequency Interference
  • 6m High Pass TVI filter - Are you suffering from TVI? Then why not try this filter for size. It is a three-stage high-pass filter that blocks low-frequency 50MHz signals while letting through UHF TV.
    [ Hits: 1292 | Votes: 2 | Rating: 3.00 ]
Technical Reference : Receivers
  • Homebrew radio receiver - Detailed plans of my homebrew receiver. Frequency coverage is from below 300kHz to 30MHz. Pictures, schematics, board layouts, parts lists and more can be found here.
    [ Hits: 20349 | Votes: 26 | Rating: 6.00 ]
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