Difference between revisions of "HF"

Revision as of 18:08, 28 November 2009

"HF" is an abbreviation for "High Frequency." See Spectrum.

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.

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

"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.

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

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.

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

@@ Line 40: / Line 40: @@
 ==Equipment==
-===HF Capable Receivers===
+* For links to antennas, reviews, modifications and filters, see our [[HF Equipment and Accessories]] article
-* These are manufacturers of receivers and other equipment that can be used to listen on HF;
-** [[AOR Radios]]
-** [[Icom Radios]]
-** [[Alinco Radios]]
-** [[Yaesu Radios]]
-** [[Yupiteru Radios]]
-* The [[:Category:Receiver Reviews|Receiver Reviews]] category has numerous links on receiver reviews, many of which are online
-===Antennas and Filters===
-* No matter how good the radio, without an antenna, it won't hear very much. Here's a few places to get some links and information on the subject
-** [[HF Antennas]]
-** [[Active Antennas KB6RWX]]
-** [[Loops]] Some are broadbanded enough to reach the HF spectrum
-** [[The McGyver(tm) special]]
-* In urban areas, it's sometimes necessary to add some front end filtering to eliminate reception (or at least reduce it) of MW signals. These signals can cause multiple false signals (often heard as distorted spurs) to appear throughout parts, or all, of the HF spectrum.
-** [http://www.iceradioproducts.com/filtersrf.html#bcb ICE BCB Filters]
-** [http://www.kiwa.com/bcb.html Kiwa Broadcast Band Rejection Filter]
-** [http://www.kiwa.com/bcblw.html Kiwa Broadcast Band filter for longwires]
-** [http://www.parelectronics.com/swl_filters.htm PAR BCST-HPF Filter]
-*** [http://www.monitoringtimes.com/html/mt2001reviews.html#PAR%20AM%20Broadcast%20Filter PAR AM Broadcast Filter review from MT]
-** [http://www.scannermaster.com/SearchResults.asp?Cat=39 Scanner Master Filters page]
-** [http://www.stridsberg.com/prod02.htm Stridsberg Engineering Filters]
 == 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.
+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
-[[Live Tunable Receivers]]
 [[Category:HF Topics]]
 [[Category:RR Glossary]]