low frequency

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Search Results for "low frequency"

76 links - and 2 categories

Antennas : Theory
  • Azimuth Radiation Patterns - Below VHF the change in the radiation characteristics of an antenna will change considerably from frequency to frequency, making antenna selection more complicated.
    [ Hits: 706 | Votes: 1 | Rating: 10.00 ]
  • Earth Systems - In order to resonate at a particular frequency, an antenna needs to be at least one half wave length long. Antennas below a 1/2 wave are dependent on a ground system for resonance as well.
    [ Hits: 928 | Votes: 1 | Rating: 3.00 ]
DX Resources : Beacons : Beacon stations
  • WA8YWO - High Frequency Expermental Beacon "WV". The Beacon operates on the frequency of 13.55567mhz. This Beacon is very low power. It operates under Part 15 of the FCC Rules and Regulations. It transmits with only 1.5 milliwatts of power
    [ Hits: 269 | Votes: 0 | Rating: 0.00 ]
  • Beacon Station MO 189.5 KHz - This site is dedicated to experimental low frequency operation in the 160 to 190 kHz spectrum. LF beacon MO is no longer active. This page is retained only for reference information.
    [ Hits: 218 | Votes: 0 | Rating: 0.00 ]
DX Resources : DX Peditions : 2010 DXpeditions
  • V25WV Barbuda - DX mobile from Barbuda follow on twitter wd8mgz for frequency schedule time or on ecolink
    [ Hits: 139 | Votes: 0 | Rating: 0.00 ]
Manufacturers : Antennas : Marine
  • LF antennas - Welcome to our line of Low Frequency, Natural Radio Research, Broadcast, Marine and Shortwave products. Our evolving product line is the result of our dedicated research efforts primarily in the areas of LF, VLF, MF, and HF.
    [ Hits: 174 | Votes: 0 | Rating: 0.00 ]
Manufacturers : QRP Kits
  • N3ZI Kits - Low Cost Frequency Counter, Digital Display and DDS-VFO kits
    [ Hits: 1881 | Votes: 5 | Rating: 5.40 ]
Operating Modes
  • Introduction to Digital Modes - Wireless Society of Southern Maine, Digital Modes Page, introduction to amateur radio digital modes, including FLDIGI, PSK31, RTTY, high speed CW, Slow Scan Television, HF Weather Fax, WeFAX, MFSK16, OLIVIA, G-TOR, AMTOR, MT63, Digital SSTV, Frequency Key Shifting, and more
    [ Hits: 636 | Votes: 3 | Rating: 10.00 ]
Operating Modes : Longwave
  • VLF Group - Starlab Very low frequency group
    [ Hits: 204 | Votes: 0 | Rating: 0.00 ]
Operating Modes : Satellites
  • How Satellite Doppler Tracking Works - The Doppler Effect allows the distance between a satellite transmitting from space and a radio receiver on the ground to be measured by observing how the frequency received from the satellite transmitter changes as the satellite approaches, passes overhead, and moves away.
    [ Hits: 307 | Votes: 3 | Rating: 4.67 ]
Propagation
  • WSPRnet Weak Signal Propagation Reporter Network - A group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power transmissions. Computer sent/received Morse signals received by amateurs and collected on an online database.
    [ Hits: 969 | Votes: 2 | Rating: 10.00 ]
Radio Equipment : HF Transceivers : Kenwood TS-870S Shopping and Services : Kits and Components
  • LCD Digital Dial DDS VFO - Low Cost frequency counters and DDS VFO's for QRP and Vintage Radio's. LCD Digital Display, Frequency Counter or DDS VFO
    [ Hits: 677 | Votes: 2 | Rating: 5.50 ]
Software : Android
  • DroidSSTV - DroidSSTV lets you transmit and receive amateur radio (ham radio) slow scan TV (SSTV) on your Android Smartphone or Android tablet. This communications app is a great tool for portable amateur radio SSTV operation. Just connect your Android phone or tablet to an HF radio, tune on to an SSTV frequency, and watch the pictures scroll onto the screen. DroidSSTV supports the modes Scottie 1, Scottie 2, Scottie DX, Martin 1, and Martin 2 at this time.
    [ Hits: 344 | Votes: 1 | Rating: 10.00 ]
Software : Propagation
  • MicroMUF - MicroMUF is a windows free HF propagation calculator that you can use to estimate the MUF (Maximum Usable Frequency) and LUF (Lowest Usable Frequency) between any two points on the Earth.
    [ Hits: 993 | Votes: 1 | Rating: 4.00 ]
Technical Reference : Amplifiers : RF Amplifiers Theory
  • Enable Low Cost RF Power Amplifiers - A new paradigm for low cost, reliable RF amplifier ‘pallets’ has been enabled by new circuit design, manufacturing and thermal management techniques
    [ Hits: 886 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Filters
  • W3LPL Receiving Bandpass Filters - Project of receive only filters optimized for minimal loss and very high rejection of frequencies below 75% of the filter center frequency by K1TTT
    [ Hits: 847 | Votes: 0 | Rating: 0.00 ]
Technical Reference : Frequency Counter
  • Low cost frequency counter - Low cost multifunctional seven digit LCD frequency counter, for your HAM radio shack
    [ Hits: 1903 | Votes: 1 | Rating: 10.00 ]
  • Programmable 50 MHz Counter - The frequency counter described here was built up using the "sandwich" construction and uses low cost components
    [ Hits: 1063 | Votes: 0 | Rating: 0.00 ]
  • The BBRC Frequency Counter - The Burnham Beaches Radio Club frequency counter is a PIC micro controller based frequency counter with LCD readout. It can be used stand alone or the in built offsets allow integration into a receiver
    [ Hits: 694 | Votes: 0 | Rating: 0.00 ]
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