freq

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freq

743 links - and 15 categories

Antennas : Antenna Calculators Antennas : Baluns : 1 to 1 Balun
  • Practical Guanella 1:1 balun - This article proposes a lossy transmission line model of a practical Guanella 1:1 balun that is effective for all frequencies within and immediately adjacent to the pass band
    [ Hits: 3617 | Votes: 3 | Rating: 3.33 ]
Antennas : Multiband
  • Vertical antenna for Vacation - Vertical Vacation Antenna for 80, 40 and 20 Meter-Band, by Herbert OE3BMB This antenna is a full size λ/4 for 20m and 40m band, and a shortened λ/4 for the 80m band. Generally on the 40m band the SWR is under 1,6. In 80m and 20m band at the resonant frequency the SWR is about 1,1.
    [ Hits: 5035 | Votes: 4 | Rating: 8 ]
Antennas : Spiral
  • Petlowany Antennas by K6NO - WorldRadio Article on Petlowany antennas base on this principle: if a length of wire is wound into a spiral-shaped coil and excited by a radio frequency current connected to the innermost portion of the coil, it will then, and only then, exhibit RF characteristics that closely approximate those of a resonant linear wire of the same length
    [ Hits: 3765 | Votes: 9 | Rating: 6.22 ]
Antennas : Wire
  • The Zeppelin antenna - It consists of a radiating wire with a length equal to the half-wave of the fundamental frequency for which the antenna is cut.
    [ Hits: 2228 | Votes: 2 | Rating: 8 ]
Ham Radio : Blogs : USA Operating Modes : D-STAR
  • BCFMCA D-STAR System - British Columbia Frequency Modulation Communications Association
    [ Hits: 400 | Votes: 0 | Rating: 0 ]
Operating Modes : JT65 Operating Modes : Longwave
  • 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: 480 | Votes: 0 | Rating: 0 ]
Operating Modes : MFSK
  • Olivia, the Magic Digital Mode - Olivia MFSK digital communications are becoming popular in amateur radio because Olivia is one of the most robust methods of text keyboarding, that can perform superbly for long distance communications. Olivia frequencies, format and software
    [ Hits: 1931 | Votes: 8 | Rating: 8.38 ]
Operating Modes : Repeaters Radio Scanning : Regional : USA Radio Scanning : Scanner Frequencies
  • CityFreq - United States Scanner Frequencies, Phone Numbers, and IP Addresses
    [ Hits: 2328 | Votes: 14 | Rating: 6.21 ]
Software : DSP
  • NBEMS - The Narrow Band Emergency Messaging System (NBEMS) for Windows is a suite of software programs designed for point-to-point, fast, error-free, emergency messaging up to or over 100 miles distant, and takes up a very minimum of frequency space on the ham bands, leaving more space for other ham activites.
    [ Hits: 1306 | Votes: 1 | Rating: 10 ]
Software : Linux
  • IBP - Beacon Monitor - Linux program that helps one with monitoring the beacons of the International Beacon Project, by continuously showing which beacon is transmitting on which frequency, along with the distance and antenna directions by PA3FWM
    [ Hits: 1489 | Votes: 2 | Rating: 5.5 ]
Software : Macintosh
  • The KB6IBB Utilities - Ham radio frequency list consolidation software. The Ham Radio database can house a unlimited number of records. Holding frequency information from DC to Daylight. The Radio Scanner Database is designed to emulate a radio scanner. A 5,000 record table is provided and is organized by channel number.
    [ Hits: 1057 | Votes: 1 | Rating: 7 ]
Software : Radio Control
  • KE7ATE - VR-5000 Signal Capture and Analysis Software - Give your VR-5000 a new face. Controls your VR-5000, Log stations, Manage frequency lists, Record Audio and more. This program utilizes a more visual approach to simplify your radio listening.
    [ Hits: 1956 | Votes: 4 | Rating: 3.25 ]
Technical Reference : Vacuum tube
  • rec.radio.amateur.boatanchors FAQ - Frequently Asked Questions - about vintage tube-type ham radio and communications equipment
    [ Hits: 422 | Votes: 0 | Rating: 0 ]

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