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"HF" is an abbreviation for "High Frequency." See [[Spectrum]].
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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.
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'''Welcome to the RadioReference HF Gateway. "HF" is an abbreviation for "High Frequency."  See [[Spectrum]].'''
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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 it's best to listen below 10 mhz at night, above this during the day. Our [[HF Propagation]] article has links that describe these phenomenon in greater detail.
  
 
Many of the FAQs linked here are courtesy of [http://www.dxing.com DXing.Com] from Universal Radio of Reynoldsburg Oh. and the Monitoring Times website.
 
Many of the FAQs linked here are courtesy of [http://www.dxing.com DXing.Com] from Universal Radio of Reynoldsburg Oh. and the Monitoring Times website.
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*  [http://en.wikipedia.org/wiki/Short-wave_radio Wikipedia article on SW Radio]
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*  [http://www.dxing.com/modesand.htm Commonly Used Modes]
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*  [http://www.dxing.com/tuning.htm Frequency Ranges and Uses]
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*  [http://www.dxing.com/frequenc.htm Frequency vs.Wavelength]
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*  [http://www.monitoringtimes.com/html/glossary.html Glossary of Terminology]
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*  [http://www.dxing.com/radterms.htm Terms and Abbreviations]
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*  [http://www.dxing.com/utcgmt.htm UTC and GMT]
  
 
The RR forum for this topic can be found [http://www.radioreference.com/forums/forumdisplay.php?f=79 here]
 
The RR forum for this topic can be found [http://www.radioreference.com/forums/forumdisplay.php?f=79 here]
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== Amateur Radio ==
 
== Amateur Radio ==
* [[Amateur Radio on HF]]
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* [[Amateur Radio on HF]]  
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== Citizen's Band ==
 
== Citizen's Band ==
 
*  See the [[Citizens Band]] page for frequencies and channels
 
*  See the [[Citizens Band]] page for frequencies and channels
 
*  [http://www.reactintl.org/ REACT]  
 
*  [http://www.reactintl.org/ REACT]  
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== Short Wave Broadcast ==   
 
== Short Wave Broadcast ==   
 
* [[SWL Broadcast]]   
 
* [[SWL Broadcast]]   
* [[Pirates and Clandestines]]   
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* [[Pirates and Clandestines]]
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== Utility Monitoring ==
 
== Utility Monitoring ==
The best way to describe Utility (Ute) monitoring is to use negative logic; it excludes CB, Amateur and Short Wave Broadcast. This includes, but is not limited to, aeronautical stations, digital signals (outside of the specified amateur bands), military, maritime, federal and other users.  See our [[Utility Monitoring]] page for more information and links.
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*[[Utility Monitoring]]
  
 
=== Utility Topics ===       
 
=== Utility Topics ===       
 
* [[ALE]]
 
* [[ALE]]
 
* [[COTHEN]]
 
* [[COTHEN]]
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* [[Federal Aviation Administration]]
 
* [[HF Aeronautical Communications]]   
 
* [[HF Aeronautical Communications]]   
 
* [[HF Digital Decoding]]
 
* [[HF Digital Decoding]]
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* [[HF Military Communications]]  
 
* [[HF Military Communications]]  
 
* [[ICE]] - Monitoring U.S. Immigration and Customs Enforcement HF Operations  
 
* [[ICE]] - Monitoring U.S. Immigration and Customs Enforcement HF Operations  
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* [[United States Coast Guard]]
 
* [[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
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== Online HF Receivers ==
 
== 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
 
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
 
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[[Category:HF Topics]]
 
[[Category:HF Topics]]
 
[[Category:RR Glossary]]
 
[[Category:RR Glossary]]
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[[Category:Gateways]]

Latest revision as of 21:12, 12 March 2010

Welcome to the RadioReference HF Gateway. "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 it's best to listen below 10 mhz at night, above this during the day. 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



Amateur Radio


Citizen's Band




Equipment

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