Difference between revisions of "HF"
From The RadioReference Wiki
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== Utility Monitoring == | == Utility Monitoring == | ||
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=== Utility Topics === | === Utility Topics === | ||
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* [[ICE]] - Monitoring U.S. Immigration and Customs Enforcement HF Operations | * [[ICE]] - Monitoring U.S. Immigration and Customs Enforcement HF Operations | ||
* [[USAF High Frequency Global Communications System]] | * [[USAF High Frequency Global Communications System]] | ||
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==Equipment== | ==Equipment== | ||
* For links to antennas, reviews, modifications and filters, see our [[HF Equipment and Accessories]] article | * For links to antennas, reviews, modifications and filters, see our [[HF Equipment and Accessories]] article | ||
Revision as of 19:52, 28 November 2009
"HF" is an abbreviation for "High Frequency." See Spectrum.
High frequency communications occur in the 2-30 MHz band. Signals in this band can be refracted by the ionosphere allowing worldwide propagation. The distance varies depending on time of day, the solar cycle and current solar and geomagnetic activity, but in general the higher frequencies go further in daylight and the lower frequncies go further at night. Our HF Propagation article has links that describe these phenomenon in greater detail.
Many of the FAQs linked here are courtesy of DXing.Com from Universal Radio of Reynoldsburg Oh. and the Monitoring Times website.
The RR forum for this topic can be found here
Contents
Amateur Radio
Citizen's Band
- See the Citizens Band page for frequencies and channels
- REACT
Short Wave Broadcast
Utility Monitoring
Utility Topics
- ALE
- COTHEN
- HF Aeronautical Communications
- HF Digital Decoding
- HF Maritime Communications
- HF Military Communications
- ICE - Monitoring U.S. Immigration and Customs Enforcement HF Operations
- USAF High Frequency Global Communications System
Equipment
- For links to antennas, reviews, modifications and filters, see our HF Equipment and Accessories article
Online HF Receivers
There are quite a few receivers online that you can listen to HF communications. Some of them even allow you to control the radio for limited times. Some others are set to a specific frequency on the HF band that usually has a lot of activity. See the Live Tunable Receivers article