hf frequencies

hf frequencies

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• Choking balun for 160-30 meter band - Choking balun for lower HF and MF bands. (1.8MHz - 10MHz). Requiring a choking balun to isolate the potential RF pick up on the coax cable as it runs past equipment such as computer within the radio room at lower HF and MF frequencies a simple method of winding RG58 coax onto a Powdered Iron Toroid Core was constructed.
  [ Hits: 196 | Votes: 3 | Rating: 6 ]

• VHF Collinear Antenna - This antenna will cover the 2 meter Ham Radio frequencies. This collinear antenna has a total gain factor approx 6 to 7dbd on two meter band
  [ Hits: 2302 | Votes: 6 | Rating: 4 ]

• Cavity antennas - Cavity antennas are weatherproof antennas for UHF and microwave frequencies. Require more metal for the same decibels of antenna gain but a cavity antenna is relatively easy to weatherproof.
  [ Hits: 305 | Votes: 2 | Rating: 5.5 ]

• Long Wire Antenna for portable operations - With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
  [ Hits: 804 | Votes: 13 | Rating: 8.69 ]

• US Communication antennas - UnderBumper diversity licence plate antenna system (front and rear license plates) become the antennas. Available in VHF, UHF, Dual Band and other frequencies. We also manufacture mobile antennas for HF VHF UHF wideband antennas
  [ Hits: 580 | Votes: 0 | Rating: 0 ]

• JT65 HF JT65A HF Frequency Information - JT65A frequencies. List of common HF frequencies where you can work JT65A.
  [ Hits: 3449 | Votes: 18 | Rating: 4 ]

• 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: 1932 | Votes: 8 | Rating: 8.38 ]

• Ham Radio: Using Repeaters - The most basic form of repeater receives communication on one frequency and re-transmits at a different frequency. This is known as duplex communication. Repeaters are generally set up to operate with FM modulation on the amateur bands within the VHF (30 MHZ – 300 MHZ) and UHF frequencies (300 MHZ – 3 GHz). These are generally the frequencies used by handheld and mobile devices.
  [ Hits: 92 | Votes: 1 | Rating: 8 ]

• UHF VHF Repeaters in Italy - List of VHF UHF ham radio repeaters in italy with frequencies and locations
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• Using a Baofeng handheld to work Satellites - How to program Baofeng handheld transceiver with satellite frequencies, and how to get alerts when satellites are visible by using a smartphone app. A beginners guide to work satellites with a common VHF handheld radio.
  [ Hits: 545 | Votes: 5 | Rating: 8.2 ]

• FM Repeater & Simplex Channel System 70 cm / 2 m / 6 m / 10 m & Offsets - A very useful table with frequencies for HF VHF UHF repeaters including offsets, steps, grouped by country, with special reference to european band plan.
  [ Hits: 831 | Votes: 1 | Rating: 3 ]

• Major World Air Route Areas Frequencies - MWARA list of major world air route areas frequencies. A wide network of HF Frequencies has been allocated to provide voice communications between aircrews and ATC.
  [ Hits: 755 | Votes: 3 | Rating: 7 ]
• Aeronautical HF-Radio Map - A large worldwide map of aeronautical service Frequencies allocation on HF bands dated 2002
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• Cruise Ship and Maritime Monitoring Frequencies - Cruise Ship and Maritime Monitoring Frequencies - cruise ship frequencies maritime scanning radios vhf uhf
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• Marine VHF Frequencies - The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2012 World Radio Conference.
  [ Hits: 820 | Votes: 1 | Rating: 6 ]

• Wisconsin Scanner - Wisconsin UHF VHF scanning frequencies
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• Scanning frequencies - HF digital mode transmissions, voice transmissions in HF and VHF Bands collected in several XLS files by Relic Radio communications
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• Specialist Antennas - Antenna products and accessories for commercial, industrial, Emergency Service and military applications covering VHF, UHF, TETRA, ISM and GSM frequencies and beyond.
  [ Hits: 486 | Votes: 0 | Rating: 0 ]

• FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
  [ Hits: 283 | Votes: 1 | Rating: 2 ]

• VHF-UHF Diplexer - Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.
  [ Hits: 1140 | Votes: 2 | Rating: 5 ]

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