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Topic: HF radio

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	High frequency - Wikipedia, the free encyclopedia
		High frequency (HF) radio frequencies are between 3 and 30 MHz.
		Since the ionosphere often reflects HF radio waves quite well (a phenomenon known as Skywave), this range is extensively used for medium and long range terrestrial radio communication.
		This is due to the frequencies on which BPL operates (typically corresponding with the HF band) and the tendency for the BPL "signal" to leak from power lines.
	en.wikipedia.org /wiki/High_frequency (429 words)

	Ionosphere - Wikipedia, the free encyclopedia
		The F layers are responsible for most skywave propagation of radio waves, and are thickest and most reflective of radio on the side of the Earth facing the sun.
		When a radio wave reaches the ionosphere, the electric field in the wave forces the electrons in the ionosphere into oscillation at the same frequency as the radio wave.
		The cutoff frequency is the frequency below which a radio wave fails to penetrate a layer of the ionosphere at the incidence angle required for transmission between two specified points by reflection from the layer.
	en.wikipedia.org /wiki/Ionosphere (2840 words)

	High-frequency radio and transformation Army
		Accordingly, HF development ground to a virtual halt in the "big" Army, and the once-extensive HF institutional training and doctrine base of the 1930s, 40s and 50s eroded to an almost-nonexistent capability.
		The radio stores this data and, based on the data, the radio automatically selects the best frequency for communications at that time and the net is opened for traffic.
		ALE is a major factor in the resurgence of tactical HF radio because it eliminates the basis of many past circuit-reliability problems that were rooted in poor RF-selection techniques.
	www.gordon.army.mil /AC/wintr01/HFIBCT.htm (4372 words)

	HF Mobile Radio Page - W6TEE
		HF mobile first became popular in the 40s on 10 meters.
		HF mobile activity was reduced by repeaters and small cars.
		New smaller HF rigs are allowing a return to HF mobile operating.
	home.pacbell.net /lcobb/hfmobile.htm (278 words)

	HF Single Sideband Radio System (Site not responding. Last check: 2007-11-02)
		Normal operating mode is to take one radio into the field on missions to remote areas, and set the other radio up at a members house.
		The radio is crystal controlled on a number of frequencies used in Alaska in the maritime ship-shore environment, and for shore to shore private communications.
		Normally, the radio is only turned on for a scheduled call each morning and each evening, allowing one battery charge to last for several days in the field.
	www.amrg.org /communications/hfssb.html (481 words)

	NB6Z's "digital ham radio" (Site not responding. Last check: 2007-11-02)
		radio is a FSK mode that is an adaption of the very popular Packet radio used on VHF FM ham radio.
		Although the HF version of Packet Radio has a much reduced bandwidth due to the noise levels associated with HF operation, it maintains the same protocols and ability to "node" many stations on one frequency.
		We occasionally experience periods of improved ionospheric conditions, allowing HF propagation to occur on the higher bands such as 10 meters and allowing 20 meters to be usable for longer periods after sunset.
	home.teleport.com /~nb6z/about.htm (1977 words)

	U.S. Clandestine Radio Equipment
		With the advent of effective portable radio technology in the 1930’s, it became feasible for an operative to send and receive information quickly and independently from within enemy territory.
		It is partly inaccurate to say that an RS-6 set is a “SAC survival radio”, or that a Minox camera is a “spy camera”.
		Most equipment developed by the CIA tends to be designated like "RS-x" for a radio set, "RT-x" for a transmitter, and "RR-x" for a receiver.
	www.militaryradio.com /spyradio (1433 words)

	Tuning HF - Ham Radio Article (Site not responding. Last check: 2007-11-02)
		The TNC's bargraph is an aid for you to tune the radio to the tones expected by the TNC.
		Besides the two tones needed for decoding the digital message, the radio is also receiving other noise that is within the passband of the radio.
		The passband of a radio determines the frequencies that are passed to the audio circuits.
	users3.ev1.net /~medcalf/ztx/tunehf.html (1388 words)

	Shortwave Radio Listening (SWL and High Frequency Radio)
		Shortwave Radio is similar to the local AM Broadcast Band on Mediumwave (MW) that you can hear on a regular "AM Radio" receiver, except that shortwave signals travel globally, depending on the time of day, time of year, and space weather conditions.
		Radio Bahrain - Round the clock, Radio Bahrain broadcasts on 96.5 and 101 mHz FM Stereo, 1584 kHz mediumwave, and 6010 kHz shortwave.
		Radio Free Europe/Radio Liberty - Radio Free Europe / Radio Liberty is an international news and broadcast organization serving Central and Eastern Europe, the Caucasus, Central Asia, Russia, the Middle East and Balkan countries.
	swl.hfradio.org (3739 words)

	[No title]
		Radio waves travel in straight lines (except at very low frequencies) and the earth is curved, so we should not be able to communicate with anything we can't see.
		This is because HF radio does not use the ground based bearer network, and has power requirements modest enough to be met with batteries and generators.
		The British long-range HF radio station is known as 'Portishead Radio' and is located at Highbridge in Somerset.
	www.reliefweb.int /library/dc1/dcc3.html (7004 words)

	Telstat: Communicate - HF Radio's
		HF Networks can be incorporated around this radio with features never seen before in other HF radios, whether custom designed for voice or tracking, the NGT radio will meet the highest requirements.
		The Barrett 980 series of HF marine transceivers are state of the art, economical 100 Watt HF SSB transceivers designed for both GMDSS and non-GMDSS marine installations.
		The Barrett 2050 HF transceiver, the centre piece of the 2000 series of HF communications equipment, combines current technology with the intuitive, “ease of use” that has become synonymous with Barrett Communications equipment.
	www.telstat.com.au /comm4.htm (395 words)

	MAKE: Blog: HF Radio powered email... (Site not responding. Last check: 2007-11-02)
		It requires an HF Radio, HF Modem and an antenna, which can all be installed on an easy Do-It-Yourself basis.
		Therefore, they are having to modify the Icom radio to work out of band and this is an FCC violation.
		Winlink is being used in disaster situations by US amateur radio operators and is also being used primarily by ships at sea to send e-mail messages.
	makezine.com /blog/archive/2006/01/hf_radio_powered_email.html?... (797 words)

	HF (high frequency) and VHF Radiowave Propagation Center: Live propagation and space weather data and forecasts
		It is a "must read" for Radio Amateurs, Shortwave Listeners, and radio communicators of any type who need to make the most productive use of the radio spectrum, regardless of the time of day, the season of the year, or the state of the sunspot cycle.
		For more than a half-century, CQ has been on ham radio's leading edge -- the first to promote mobile operating (in the 1950s), semiconductors (in the 1960s) and packet radio -- the original e-mail (in the 1980s).
		In fact, it's the most comprehensive radio hobby magazine in the U.S. Packed with up-to-date information concisely written by the top writers in the field, Monitoring Times® is your foremost guide to profiles of broadcasting and communications installations; home projects; and tips on monitoring everything from air, sea, and space to distant ports of call.
	hfradio.org /propagation.html (1360 words)

	Radio H.F. — Shortwave, scanning, amateur radio, CB, FRS, antennas, accessories, radio publications & more
		Radio H.F. Specialists in shortwave radio, scanners, amateur radio, FRS (family radio), CB radio, antennas, accessories and publications, since 1995.
		Radio Hovsep is Montreal's specialist in repairs and restoration to radios and related electronic equipment.
		Radio Hovsep is now an authorised outlet for books and publications from Radio H.F. Visit the Radio Hovsep
	www3.sympatico.ca /radiohf (395 words)

	Radio Modifications : Technical Reference: HF Radios
		HF radio modifications, ham radio mods kenwood icom yaesu alinco mods
		HF Rigs comparison - Here are the most popular features of the current HF radios.
		Radio QRP - The Art of Low Power - QRP is The Art of Low Power Radio where the challenge is to operate and/or build AM radio transmitters usinga bare minimum of components, money and construction skill.
	www.dxzone.com /catalog/Technical_Reference/HF_Radios (1771 words)

	Welcome to H.F. Radio On Board
		The Marine Single Sideband Radio, commonly referred to as the SSB is the VHF's big brother and has a range, depending up on frequency that extends to 3,000 miles and beyond.
		Please click here for information on why email is the BEST way to communicate with HF Radio on Board, shipping charges on orders outside the continental U.S., Foreign Credit card payments and other things you should know about doing business with HF Radio on Board.
		She is also a licensed amateur radio operator and is quite conversant in the subjects discussed on this page.
	www.hfradio.com (859 words)

	Brunei Bay Radio providing low cost HF SSB radio communications in SE Asia
		Marine HF radio users include racing and cruising yachts, motor yachts, sports fishing boats, dive boats, surf and dive charter vessels and charter power or sail yachts.
		This is assigned by the radio communications authority in the vessel's country of registration.
		Land based users require a HF-SSB radio licence issued by the communications authority in their country where the equipment is operated.
	www.bruneibay.net /bbradio (464 words)

	About HF SSB Radio Equipment: Mobat, Micom Long Range Two-Way SSB Radios, HF Transceiver, Manpack
		HF/SSB radio operates in the lower end of the commercial AM frequency spectrum (1.8 to 30 MHz).
		Its major characteristic is very long radio wave lengths that can reflect off a belt of charged particles girding the earth called the ionosphere.
		This frequency variation is required to compensate for the changed geometric angle between points A and B caused by the expansion and constriction of the ionosphere.
	www.royal-communications.com /pages/hfssb_today.html (1196 words)

	HF Radio - New (Site not responding. Last check: 2007-11-02)
		HF Radio has been around for many years and is still the most cost effective way to communicate in the outback.
		In the first instance most people purchase an HF radio mainly for use with the 'Royal Flying Doctor Service' for maximum safety in the Outback.
		This facility via the 'Radtel HF Radio Network' allows you to make phone calls directly from your radio.
	www.lakecomm.com.au /hf.html (489 words)

	MilSpec Communications: Harris RF-5710 HF Radio Modem
		The Harris RF-5710 HF Modem, nomenclatured MD-5077(V)3/U, is a compact unit having the ability to generate the following HF waveforms using the same hardware: MIL-STD-188-110A Serial, Frequency Shift Keying (FSK), North Atlantic Treaty Organization Standard Agreement #4285 (NATO STANAG 4285), and NATO STANAG 4529.
		Harris was the original inventor of the HF single tone demodulation technique and holds patent rights to the "Data Directed Equalization" technique.
		When selecting a modem waveform and data rate, please take into consideration the type of HF radio equipment you are using.
	www.milspec.ca /modems/rf-5710.html (1496 words)

	N2JEU's Web Controlled Shortwave Receivers (Site not responding. Last check: 2007-11-02)
		By selecting one of the receivers using the links below a radio control web page will open up that will let you change the frequency, mode and a few other parameters of the radio in real time.
		Keep in mind that radio propagation conditions where the receivers are located is often different than in the part of the world where you are located.
		Signals you might hear locally may not be heard where the radios are located in upstate New York in the USA.
	www.ralabs.com /webradio (466 words)

	ARRLWeb: ARRL Home Page (Site not responding. Last check: 2007-11-02)
		At the ESA's request, the Amateur Radio on the International Space Station (ARISS) international team is lining up a schedule of school QSOs for Reiter, seen left in photo with crewmates Commander Pavel Vinogradov, RV3BS (center), and Flight Engineer Jeff Williams, KD5TVQ.
		Duties include using radio signal analysis equipment deployed throughout the US to collect, correlate, and analyze the characteristics of radio signals involved in interference problems, distress or safety-related signals or other radio signals involved in other high-priority activities such as law enforcement or national defense.
		Hiroshima Children's Museum Visitors Speak with ISS via Ham Radio (Jul 12, 2006) -- Youngsters visiting Hiroshima Children's Museum in Japan July 4 were among the latest earthlings to have the opportunity to speak via Amateur Radio with the crew of the International Space Station.
	www.arrl.org /#art_5483 (1696 words)

	RapidM HF radio modem, HF data modem, HF Email, STANAG, MIL standards, ALE
		RapidM is at the forefront of HF Data Modem, ALE and HF e-mail technology.
		RapidM specialises in the development of HF modems, which are able to transfer data over significant distances (10 000 kilometres and more) without any fixed infrastructure by bouncing data off of the Earth's ionosphere.
		If required, the generic radio control interface can be customised for integration with a particular radio.
	www.rapidm.com (318 words)

	Amazon.com: HF Radio E-Mail for "Idi-Yachts": Books: Marti Brown (Site not responding. Last check: 2007-11-02)
		HF Radio E-Mail for "Idi-Yachts"® A Guide for Setting Up and Using Wireless E-mail Through Ham/Marine SSB Radio, by Captain Marti Brown, includes information on everything you need to send and receive E-mail through an HF (Ham and/or Marine Single Sideband) Radio.
		Hf Radio Email for Idiyachts A Guide for Setting Up and Using Wireless Email Through Hammarine SSB Radio by Captain Marti Brown Hf Radio Email for Idiyachts includes information.
		HF radio products for short, intermediate, and long-range communications for use in manpack, transportable, vehicular, and fixed applications.
	www.amazon.com /exec/obidos/tg/detail/-/0971564019?v=glance (805 words)

	Hf Radio - Compare Prices, Reviews and Buy at NexTag - Price - Review
		HF Radio Systems and Techniques: Proceedings, 7th International Conference on HF R...
		Build a working diode radio that needs no electricity and no batteries Works like early crystal radios, using electromagnetic power Kit is packed with HF coil, variable...
		This is the Hitec Aggressor 3 channel FM pistol grip 75MHz radio with HFS-03MM Micro Receiver and one HS-325 Ball Bearing Servo.
	www.nextag.com /hf-radio/search-html (324 words)

	Radio H.F. Internet Newsletter
		Welcome to the on-line newsletter of Radio H.F., issued monthly, and distributed by e-mail to subscribers, free of charge.
		With my main interest, as well as my business, being radio, the first section will be a selection of sites related to radio and communications known as the Radio Zone.
		All subscriber information remains the property of Radio H.F. and myself, and will not be distributed or shared with any other individual, group, business or organization.
	www.anarc.org /cidx/radiohf (1091 words)

	The educational encyclopedia, RF circuits, radio frequency circuits, HF-circuits (Site not responding. Last check: 2007-11-02)
		DCF77 receiver every minute the full time and date is transmitted in 59 bit (from 0 to 58).
		Radio Frequency energy coupled to the antenna is detected and made available to drive millivolt level signals to the input of a DVM (Digital Volt Meter)
		As your hand moves near the metal plate, the capacitance "seen" at the collector of the transistor will change, and so will the frequency of oscillation.
	users.telenet.be /educypedia/electronics/circuitsrf.htm (773 words)

	SailMail
		Unless you either like sorting out details of interfacing laptops and radios, or you are bored to tears and looking for a challenge, we suggest that you contact your marine/ham radio dealer.
		Many SailMail members have developed an interest in radio from their use of SailMail and have subsequently become licensed Hams, and use the Ham WinLink system as well as SailMail.
		The SailMail stations are set up in the same configuration as that used on the Ham Radio digital networks for many years; each transceiver is hooked through an automatic antenna tuner to a single antenna.
	www.sailmail.com (3958 words)

	eBay - hf radio, Radios CB, Ham Shortwave, Parts Accessories items on eBay.com (Site not responding. Last check: 2007-11-02)
		Shortwave Radio Antenna SW ham cb hf dx swl short wave
		KENWOOD TS-120S SSB AND CW HAM RADIO HF TRANSCEIVER
		HF Antenna Hitch Mount for Ham Radio Yaesu and Icom rigs
	search-desc.ebay.com /search/search.dll?query=hf+radio&newu=1&krd=1 (515 words)

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