Difference between revisions of "HF"

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

Amateur Radio on HF

Citizen's Band

See the Citizens Band page for frequencies and channels
REACT

Short Wave Broadcast

Utility Monitoring

Utility Monitoring

Utility Topics

ALE
COTHEN
Federal Aviation Administration
HF Aeronautical Communications
HF Digital Decoding
HF Maritime Communications
HF Military Communications
ICE - Monitoring U.S. Immigration and Customs Enforcement HF Operations
United States Coast Guard
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

@@ Line 1: / Line 1: @@
-"HF" is an abbreviation for "High Frequency."  See [[Spectrum]].
+__NOTOC__ __NOEDITSECTION__
+{| width="100%" style="vertical-align:top"
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ffffff; align:right;">
-High frequency communications occur in the 0.5-30 [[MHz]] band.
+'''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 [http://www.dxing.com DXing.Com] from Universal Radio of Reynoldsburg Oh. and the Monitoring Times website.
-== AM (MW) Band ==
+*  [http://en.wikipedia.org/wiki/Short-wave_radio Wikipedia article on SW Radio]
--1700 Khz
+*  [http://www.dxing.com/modesand.htm Commonly Used Modes]
-*  [http://www.dxing.com/amband.htm Intro to AM(MW) DXing]
+*  [http://www.dxing.com/tuning.htm Frequency Ranges and Uses]
-*  See our [[SWL Broadcast]] page for clubs devoted to this topic
+*  [http://www.dxing.com/frequenc.htm Frequency vs.Wavelength]
-*  Also check out the [http://www.radiointel.com/ref.htm RadioIntel References] page for more information
+*  [http://www.monitoringtimes.com/html/glossary.html Glossary of Terminology]
-*  Look for the topic 'MW (AM) & FM' for more links on the subject
+*  [http://www.dxing.com/radterms.htm Terms and Abbreviations]
+*  [http://www.dxing.com/utcgmt.htm UTC and GMT]
-== HF Amateur Radio Bands ==
-Meters (1.800-2.000 MHz)
-Meters (3.500-4.000 MHz)
-Meters (7.000-7.300 MHz)
+The RR forum for this topic can be found [http://www.radioreference.com/forums/forumdisplay.php?f=79 here]
+</div><br><br>
-Meters (10.100-10.150 MHz)
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ccffff; align:right;">
+== Amateur Radio ==
-'''NOTE ''' US Amateurs are limited to 200w PEP, and must use CW or digital modes (no voice). This is a shared band, and hams must avoid causing interference to other users. There is an encrypted RTTY station (assumed by many to be the US Navy) in the low portion of this band.
+* [[Amateur Radio on HF]]
+</div><br>
-Meters (14.000-14.350 MHz)
-Meters (18.068-18.168 MHz)
-Meters (21.000-21.450 MHz)
-Meters (24.890-24.990 MHz)
-Meters (28.000-29.700 MHz)
-'''NOTE ''' In July 2003, US amateurs (Generals and above) were given permission to use 5 specific frequencies in the 5 mhz region.  This came with several restrictions for mode and output power.  This [http://www.arrl.org/FandES/field/regulations/faq-60.html#q4 FAQ] outlines the frequencies and restrictions.
-*  Here's a very comprehensive list of amateur nets, updated regularly, edited by John Norfolk
-*  [http://www.w4uvh.net/nets2you.html Nets to You]
-*  And for storm-related nets, see...
-*  [http://www.ominous-valve.com/hurricne.txt Hugh Stegman's Hurricane Frequency List]
-*  [http://aa6kc.home.mindspring.com/ Bill Snyder's Hurricane Frequency List]
-Some popular ham websites:
-*  [http://www.arrl.org ARRL]
-*  [http://www.eham.net Eham.net]
-*  [http://www.qrz.com QRZ.com]
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ffccff; align:right;">
 == Citizen's Band ==
 *  See the [[Citizens Band]] page for frequencies and channels
 *  [http://www.reactintl.org/ REACT]
-*  The best known public service users of CB (tho they use other ranges, too)
+</div><br>
-== Short Wave Broadcast ==
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ccff00; align:right;">
-What is short wave broadcasting?  These FAQs will help explain it;
+== Short Wave Broadcast ==
-*  [http://www.shortwave.org/faq.htm FAQ from the National Association of SW Broadcaster (NASB)]
+* [[SWL Broadcast]]
-*  [http://www.dxing.com/swlintro.htm Introduction to SWL]
+* [[Pirates and Clandestines]]
+</div><br>
-Some FAQs about the terminology you will hear used;
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ffff00; align:right;">
-*  [http://www.dxing.com/modesand.htm Commonly Used Modes]
+== Utility Monitoring ==
-*  [http://www.dxing.com/tuning.htm Frequency Ranges and Uses]
+*[[Utility Monitoring]]
-*  [http://www.dxing.com/frequenc.htm Frequency vs.Wavelength]
-*  [http://www.monitoringtimes.com/html/glossary.html Glossary of Terminology]
-*  [http://www.monitoringtimes.com/html/dynrange.html Receiver Dynamic Range]
-*  [http://www.dxing.com/radterms.htm Terms and Abbreviations]
-*  [http://www.dxing.com/utcgmt.htm UTC and GMT]
-*  [http://www.monitoringtimes.com/html/selectivity.html Understanding Receiver Selectivity]
-*  [http://www.monitoringtimes.com/html/sensitivity.html Understanding Receiver Sensitivity]
-*  [http://www.monitoringtimes.com/html/specs.html Understanding Specifications]
-*  Take a look at the [[SWL Broadcast]] page for many related links
-and there's other kinds of short wave broadcasting, too...
+=== Utility Topics ===
-*  [http://www.dxing.com/pirate.htm Introduction to Pirate Radio]
+* [[ALE]]
-*  [http://www.dxing.com/clandest.htm Introduction to Clandestine Radio]
+* [[COTHEN]]
+* [[Federal Aviation Administration]]
+* [[HF Aeronautical Communications]]
+* [[HF Digital Decoding]]
+* [[HF Maritime Communications]]
+* [[HF Military Communications]]
+* [[ICE]] - Monitoring U.S. Immigration and Customs Enforcement HF Operations
+* [[United States Coast Guard]]
+* [[USAF High Frequency Global Communications System]]
+</div><br>
-== Utility Monitoring ==
+<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ffffcc; align:right;">
-The best way to describe Utility (Ute) monitoring is to use negative logic; it excludes everything defined above. Not CB, Amateur nor 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.
+==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
+</div>
+[[Category:HF Topics]]
+[[Category:RR Glossary]]
+[[Category:Gateways]]