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45 links - and 2 categories

Antennas : 70cm
  • Portable 70cm Quadruple Quad Beam - A suitable high gain 70cms antenna for SOTA operation was sought that did not have the drawbacks of a long Yagi antenna, principally a narrow beamwidth and bandwidth.
    [ Hits: 3545 | Votes: 3 | Rating: 8 ]
Ham Radio : Clubs : Technical Specialty Manufacturers : Amplifiers
  • TE Systems - Manuf RF power amplifiers wideband+narrowband for Commercial, Defense, OEM and amatuer markets. Also low-noise rf amplifiers
    [ Hits: 1598 | Votes: 1 | Rating: 5 ]
Operating Aids : Beginner's Guides
  • Operating Practice - ON4WW - A must read guide for all new and old operators. This document was originally written with the prime focus on DXing and pileup behavior. Suggestions by proofreaders have been implemented; the document is not as narrowly focused anymore as originally intended. It contains hints, tips and tricks for newcomers as well as old-timers. Additionally there are VHF/UHF operational matters, DX Cluster ethics, COPS, Conflict Situations and more.
    [ Hits: 2486 | Votes: 5 | Rating: 8.6 ]
Operating Aids : Phonetics and codes
  • RSQ Signal Rporting for Digital Modes - This site is devoted to promoting RSQ as an improved signal reporting system for narrow band digital modes and to demonstrating its application to the popular PSK31 mode.
    [ Hits: 710 | Votes: 1 | Rating: 5 ]
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 ]
  • Psk31 - PSK31 is a digital communications mode which is intended for live keyboard-to-keyboard conversations, similar to radioteletype. Its data rate is 31.25 bauds (about 50 word-per-minute), and its narrow bandwidth (approximately 60 Hz at -26 dB) reduces its susceptibility to noise.
    [ Hits: 1441 | Votes: 1 | Rating: 10 ]
  • CMSK - CMSK is a narrow-band weak signal digital mode for LF and MF ham radio bands defined by ZL2AFP. CMSK63 is the windows client program.
    [ Hits: 827 | Votes: 3 | Rating: 6.33 ]
Operating Modes : Navtex
  • NAVTEX - The NAVTEX system is used for the automatic broadcast of localised Maritime Safety Information (MSI) using Radio Telex (also known as Narrow Band Direct Printing, or NBDP).
    [ Hits: 2247 | Votes: 5 | Rating: 5.8 ]
Operating Modes : QRSS Operating Modes : SSTV Operating Modes : Weak Signal
  • A PC as VLF receiver - Using a PC with soundcard as a VLF receiver, how to use your PC as a receiver for narrow-band signals in the VLF radio spectrum by DL4YHF
    [ Hits: 852 | Votes: 1 | Rating: 8 ]
Radio Equipment : HF Transceivers : Elecraft K2
  • K2 Change 20 30m band filter - Elecraft K2 mod. Narrower bandpass filter, better stopband attenuation
    [ Hits: 231 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Transceivers : Yaesu FT-920 Shopping and Services : Radio Equipment Repair
  • The Radio Shop - The Radio Shop - CB or 10 Meter Radio Repair Sales and Scanner or Marine Radio Sales along with 2 Way Radio Programming with Optional FCC Narrowband Upgrades
    [ Hits: 654 | Votes: 6 | Rating: 8.17 ]
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 : Morse Code Decoders
  • CwGet  updated  pop - A program to decode morse code (CW) via sound card to text. It can work as narrow-band sound DSP-filter also. No additional hardware required — you need only receiver and computer with a sound card. Can integrate with AALog logger.
    [ Hits: 75578 | Votes: 1736 | Rating: 7.09 ]
Software : iPhone
  • MorseDecoder - HotPaw MorseDecoder for iPhone and iPad. Translates sounds from mic to text. Includes a DSP narrow band filter.
    [ Hits: 3987 | Votes: 12 | Rating: 5.91 ]
Technical Reference : Filters
  • Narrow Band-Pass filter for HF - Band-pass filters can be critical components in competitive stations. This setup may help put your station on the map.
    [ Hits: 2560 | Votes: 1 | Rating: 1 ]
  • Band-stop filter - Wikipedia page on Notch filter, a narrow stopband - high Q factor filter
    [ Hits: 442 | Votes: 2 | Rating: 2.5 ]

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