freq

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freq

743 links - and 15 categories

Antennas : Feed Lines
  • 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: 4567 | Votes: 2 | Rating: 5 ]
Antennas : WiFi
  • Dish 802.11 Wireless Networking Antenna - This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz. It can be scaled easily to the 5 GHz frequency used by IEEE 802.11a by simply scaling the dimensions on the feed can and the excitation antenna to 2.4/5 = 48% of the dimensions shown above.
    [ Hits: 9443 | Votes: 8 | Rating: 6 ]
DX Resources : IOTA
  • G3kma, iota manager's website - Iota - islands on the air - is an amateur radio programme run by the rsgb (radio society of great britain) to promote contacts with island stations worldwide on the radio amateur frequency bands.
    [ Hits: 753 | Votes: 0 | Rating: 0 ]
Ham Radio : Band Plans
  • USA frequency allocations - The radio spectrum in usa, PDF File representing the united stares frequency allocations in graphical mode, dated 2003
    [ Hits: 5827 | Votes: 4 | Rating: 8 ]
Ham Radio : Blogs : Asia
  • Amateuradiomalaysia - This site is meant to assist all Amateur Radio members know the "ins" and the "outs" of how to enjoy the hobby of getting on the amateur radio frequencies, by 9W2SSJ & 9W2RYS
    [ Hits: 327 | Votes: 0 | Rating: 0 ]
Manufacturers : Electronic Components
  • A & A Engineering - Smart Battery Chargers, WeatherFAX, Color SSTV,GPS-Based Frequency Standard, Power/SWR Meter, , Digital Frequency Synthesizers
    [ Hits: 1704 | Votes: 1 | Rating: 1 ]
Operating Aids : Radio Spectrum Operating Modes : DSP
  • Clover - Clover technical specifications, digital communications mode that conveys 8-bit digital data over narrow-band high-frequency radio.
    [ Hits: 929 | Votes: 1 | Rating: 10 ]
  • 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: 1469 | Votes: 1 | Rating: 3 ]
Operating Modes : Mobile
  • How to make your ham radio system mobile - How to make your ham radio system mobilemany ham radio operators carry radios for fun, safety and public service activities. radios for both vhf and hf frequencies can easily be installed in vehicles.
    [ Hits: 2240 | Votes: 2 | Rating: 5.5 ]
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: 1724 | Votes: 1 | Rating: 5 ]
Radio Equipment : HF Transceivers : Yaesu FT-100 Radio Equipment : VHF-UHF Handhelds : Yaesu VX-5R
  • Modifications for the Yaesu VX-5R - VX-5R Loose antenna cure, Vx-5r Free Band, VX 5 R modification for German, VX-5R expanded frequency mod, VX-5R MARS/CAP & freeband mod
    [ Hits: 3434 | Votes: 2 | Rating: 4 ]
Shopping and Services : Kits and Components
  • Fox Delta Amateur Radio Projects & Kits by VU2FD - Amateur Radio Projects & Kits for homebrewers, includes DDS,sound card interface,programmers, hamcom, frequency counter, RF Power Meter, modems and more.
    [ Hits: 1299 | Votes: 4 | Rating: 10 ]
Shopping and Services : Regional : Europe : UK
  • BB Shopping UK Distributor of PMR 446 - 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: 545 | Votes: 1 | Rating: 10 ]
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: 1832 | Votes: 2 | Rating: 10 ]
Software : Propagation
  • GeoAlert-Extreme Wizard - GeoAlert-Extreme Wizard maintains updated geophysical indices and displays the information in a friendly - at a glance - manner. GeoAlert-Extreme Wizard features a Global Maximum Usable Frequency, MUF, map that creates and manages predictions from the VOACAP engine. Displayed geophysical indices include: solar wind Bz component, speed and pressure, current WWV type indices and predicted solar flux, planetary A-Index and probability of major storms at middle latitudes for the next day.
    [ Hits: 1723 | Votes: 3 | Rating: 7.67 ]
Technical Reference : Calculators
  • LCF Calculator - LCF online Calculator, calculate relation between Frequency Capacitance Inductance and Reactance
    [ Hits: 2674 | Votes: 35 | Rating: 3.86 ]
Technical Reference : Frequency Counter Technical Reference : Homebrew
  • Display/Stabiliser unit - The Display/Stabiliser unit displays the signal frequency on a Hitachi LCD module.
    [ Hits: 815 | Votes: 1 | Rating: 10 ]

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