Actions

Difference between revisions of "HF"

From The RadioReference Wiki

(added Clandestine R site)
m
 
(39 intermediate revisions by 8 users not shown)
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 3-30 [[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.
+
'''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.
 
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]
540-1700 kHz
+
*  [http://www.dxing.com/modesand.htm Commonly Used Modes]
 
+
*  [http://www.dxing.com/tuning.htm Frequency Ranges and Uses]
*  [http://www.dxing.com/amband.htm Intro to AM(MW) DXing]
+
*  [http://www.dxing.com/frequenc.htm Frequency vs.Wavelength]
See our [[SWL Broadcast]] page for clubs devoted to this topic
+
[http://www.monitoringtimes.com/html/glossary.html Glossary of Terminology]
Also check out the [http://www.radiointel.com/ref.htm RadioIntel References] page for more information
+
*  [http://www.dxing.com/radterms.htm Terms and Abbreviations]
Look for the topic 'MW (AM) & FM' for more links on the subject
+
*  [http://www.dxing.com/utcgmt.htm UTC and GMT]
 
 
== HF Amateur Radio Bands ==
 
80 Meters (3.500-4.000 MHz)
 
 
 
60 Meters (see http://www.arrl.org/FandES/field/regulations/faq-60.html#q4 for the five USB channels)
 
 
 
40 Meters (7.000-7.300 MHz)
 
 
 
30 Meters (10.100-10.150 MHz)
 
 
 
'''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.
 
 
 
20 Meters (14.000-14.350 MHz)
 
 
 
17 Meters (18.068-18.168 MHz)
 
 
 
15 Meters (21.000-21.450 MHz)
 
 
 
12 Meters (24.890-24.990 MHz)
 
  
10 Meters (28.000-29.700 MHz)
+
The RR forum for this topic can be found [http://www.radioreference.com/forums/forumdisplay.php?f=79 here]
 +
</div><br><br>
  
 +
<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ccffff; align:right;">
 +
== Amateur Radio ==
 +
* [[Amateur Radio on HF]]
 +
</div><br>
  
== US Navy ==
+
<div style="margin: 0; margin-right:10px; border: 2px solid #B6B6B6; padding: 0 1em 1em 1em; background-color:#ffccff; align:right;">
* [http://www.weather.nps.navy.mil/~psguest/EMEO_online/module3/module_3_1.html Introduction to HF and Lower Frequency Radiation]
 
 
 
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]
 
 
 
 
== 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]  
 +
</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.angelfire.com/mb/amandx/ AMANDX]
+
== Utility Monitoring ==
*  This site has many basic articles on antennas, propagation, schedules and much more. Highly recommended reading
+
*[[Utility Monitoring]]   
*  [http://www.dxing.com/modesand.htm Commonly Used Modes]
 
*  [http://www.dxing.com/tuning.htm Frequency Ranges and Uses]
 
*  [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.radio-electronics.com/info/receivers/synchdet/sync_det.php Synchronous Modulation/Detection]
 
* [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]]
* [http://home.luna.nl/~ary/ Numbers and Oddities]
+
* [[Federal Aviation Administration]]
* [http://www.clandestineradio.com/ Clandestine Radio Watch]
+
* [[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]]

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