HF Radio

HF Radios have traditionally been the best decision for outback communications if you intend to travel throughout remote regions of Australia. In this article we discuss the usefulness of HF radio in practical situations and explain the many features and services available to enhance your use of the equipment.

Why use an HF Radio?

An HF radio is primarily designed to enable long distance communication in areas of Australia where the telephone network is not available. For generations, outback regions have relied on HF radio communications. Not only is it inexpensive to operate, it also provides access to free-to-air network broadcasts and services and connection to the Royal Flying Doctor Service (RFDS).

But unless your an enthusiast radio operator, is the HF radio still the best choice for your outback communications solution? These days, the availability and cost of satellite phone solutions has made them almost obsolete for those just starting out, and contemplating doing "the big lap".

So, let's look at what's involved in using an HF radio service:-

Firstly, your use of the airwaves is governed by Australian Communications and Media Authority. The ACMA assigns transmission rights to frequencies and can issue certain types of licences to groups or individuals that authorise transmission on these frequencies, however anyone can listen to frequencies without a license provided they do not transmit.

HF Radios can provide the following services:
  • RFDS emergency contact

  • To communicate over long distances (from as little as a couple of kilometres, or from one side of the country to the other)

  • Making telephone calls direct from your vehicle to any phone line

  • "Free to air", and Network operated radio broadcast and transmissions

  • To find someone who is near you, who can pick up a spare or assist you on your way (if used in conjunction with an optional Radio Network Service)
HF radios are ideal for people living and working in remote communities and for enthusiast radio operators. If however, you only need close distance communication, or vehicle to vehicle communication a UHF radio is better. Also consider how frequently your need for this style of communication will be. An HF radio is a large investment, and requires a permanent fitting to the vehicle for best reception. It may not feel very intuitive and can be a problem in an emergency as not many people know how to use it properly and you can't just simply dial any phone number. If just preparing for a once in a lifetime trip around Australia and you've never used radio communications, then reconsider if a satellite phone and/or EPIRB is a better combination for you.

Emergency Transmission

Most HF radio owners will be aware of the "Red" emergency button - designed for calling the nearest RFDS base. Recent changes to RFDS operations throughout Australia have changed the way HF radios can be used in an emergency however so this button will no longer work EXCEPT when reaching Broken Hill and Port Augusta. Emergency calls at all RFDS bases except Broken Hill and Port August is by Sellcall as detailed in DOC 40 on the VKS-737 website.

Joining a Network

You need to be licensed by the ACMA for the frequencies you intend to use. You may elect to join a Radio Network which carries inbuilt licensing for their own frequencies. You do not have a specific license yourself, but are authorised to use the license of the network through your membership.

The most relevant radio network for outback travellers is the Australian National 4WD Radio Network Inc. (VKS737). The primary role of this network is to provide safety orientated HF radio communications for travellers in remote areas. To join the Australian National 4WD Radio Network Inc. (VKS737) you will need to purchase a 12 month Member Subscription.

A new partnership (Oct 2010) between VKS-737 and RFDS Western Operations & RFDS Queensland Section has resulted in changes to the use of the Emergency (Red button) calling feature from your HF radio. See Emergency Transmission section (above). The VKS-737 own and operate the RFDS bases at Cairns, Carnarvon, Charleville Derby, Meekatharra, Mount Isa and Port Hedland. They provide this service free of charge to the RFDS. The RFDS own 2 dedicated HF radio bases, at Broken Hill and Port Augusta - only these 2 can be contacted direct from the Red emergency button on your HF radio. All others must be contacted via Selcall.

If you are a member of the VKS-737 network then you will know what channels and frequencies you can listen in to hear member-base operator discussions. Some people find this very entertaining and you may often pick up relevant track information and safety warnings. The Network will also run scheduled broadcasts at specific times of day for members to listen to relevant reports (weather etc) and offer many other related services.

Receiving Radio Broadcasts

The HF spectrum covers the range 1.7 to 30 MHz, which means that you can receive numerous broadcasts including Radio Australia, BBC World, School of the Air, even Voice of America and of most relevance to outback travellers you can listen to across the various frequencies to member and base operator communications on the VKS737 4WD Radio Network.

Radio Telephone

Your HF radio unit, can also be used to make telephone calls, for which you will need to subscribe to a direct dial service. There are a couple of Direct Dial HF Radio Telephone Network Services in Australia, offering a range of call plans to suit your particular needs. Yearly access fees are often bundled with pre-paid calls. Look for a network with sufficient base stations around Australia allowing you to make telephone calls directly from your HF radio to any telephone or mobile phone in Australia. Some call plans also include free RFDS and Police direct selcall contact and free emergency assistance by 24hr operator. Note that these calls are still made over the radio network, but connect into the telephone/mobile network.

A couple of things to consider when deciding if you really need to make phone calls:
  • A "phone" call from a radio is broadcast over radio waves. Anyone with a radio tuned to (or scanning) that frequency can listen to the conversation

  • Telstra still provides public phone booths throughout all towns and service centres

  • Some HF radio networks offer a message relay service, which you may consider a suitable alternative

Email, Fax, Data and GPS tracking

Recent advances in technology have enabled email, fax, data and even GPS tracking functions to be possible via HF radio. Older HF units will need modification or additional hardware and/or service agreements to enable usage and cover costs. However many modern HF radios have Global Positioning System (GPS) software installed by the maker as a standard feature. HF - GPS interface means that in theory your location coordinates can be transmitted by your HF, to a remote, suitably equipped station.

Keep in mind that these functions will be limited by the HF spectrum so don't expect the same speeds and capability that you're used to from LAN/WAN telecommunications.

How does an HF Radio work?

An HF radio is a high powered radio transmission and reception system designed to cover large distances. It is a high frequency single side-band communications system. Unlike CB and UHF radios, which have an effective working range of up to 5km, the HF radio will operate over many thousands of kilometres.

How much will it cost?

Equipment Purchase and Installation

The capital cost of purchasing and installing an HF radio system is a once off investment. A new HF radio will cost close to $3000 and since they've been used for a few decades now, there are many second-hand systems on the market varying in value depending on the functions and age of the unit. There have been many changes in technology made to the newer models such as auto-tuning antennas, GPS interfaces and modems enabling email/fax capabilities so be sure to check out what you're buying. There are three main brands of HF radio used in Australia, namely Barrett, Codan and Q-mac. All are Australian made by Australian companies, in fact it may surprise you to learn that Australia is the world leader in HF communications!

An HF radio purchased for the application of using in a vehicle requires installation similar to your stereo. A complete HF radio system includes a number of units - an antenna and aerial (can be mounted at the front or rear of the vehicle); a receiver which needs to be fixed in a dry, secure position receiving power from the vehicle's battery and correctly wired to ensure operation in an emergency situation (noting that they use high current when transmitting); and a handset with microphone that needs to be secured to the dash, or a roof console for ease of operation by either driver or passenger. The costs of a professional installation need to be checked - normally this is done at the place of purchase for an additional fee that includes some basic training. The installation should be done by someone who knows what they're doing to ensure safety, and effective operation. If you are happy to install it yourself, you might like to read our Installation Tips & Photos.

Call Costs

Probably the most attractive feature of owning an HF radio is that calls are free! However, before you get too excited over that, remember these are not calls in the sense of telephone calls. Radio calls are transmissions made over the HF radio spectrum on channels that are programmed into your set (Channels are assigned to frequencies, as they are with your television set). To change or add new frequencies you need to pay to have a programmer re-set your HF Radio - they usually have special equipment to do this. Any frequency may be added to a radio for listening purposes however you must be licenced (user-pays) to use the frequency before you can legally transmit or talk. For this reason, joining a network such as VKS737 enables you to transmit on the frequencies owned by them - this is covered by the fee you pay to join the network.

Optional Services

You can purchase various hardware and subscribe to other services to enable additional functions to be possible via your HF radio. These features include direct dialling to a phone line, sending emails and faxes, and using GPS functions. Be aware that each service will have additional costs associated with using these features.

Disadvantages & Limitations

Ease of Operation - the trade-off for gaining the ability to obtain free calls from your HF radio is learning how to use it. And for some people, it just isn't easy. The most obvious issue is that you cannot talk and listen at the same time, unlike talking on a telephone. This takes some practise and getting used to. However the most complex thing to learn when using an HF radio is how to use the various features such as Making a Voice Call, Selcall, Beacon Call and Scanning - basically you have to learn how to use the buttons and knobs and many of them will be multi-purpose buttons so you are going to have to get out the user manual and read it, practise it, and even getting so organised as to prepare a cheat-sheet in your vehicle for ready reference.

Similarly, anyone who attempts to call you on the HF radio will need to learn certain protocols and calling tips to get the call through. For vehicle to vehicle calls using HF you use the Selcall feature - you need to know the Selcall number of the person you are dialling. Networks such as VKS737 will normally make the member list available.


Electrical interference either man made or naturally occurring is the most common of possible reasons for radio interference but there are steps to avoiding interference from affecting your ability to communicate.

Common causes are: powerlines, power tools, some generators, and vehicle wiring. So for most of these, you can simply move the vehicle away from the source of interference. Electrical storms or electrically charged atmosphere can also be problematic as can having the antenna touching a tree or metal object (eg. tin shed roof).


The Australian Telecommunications industry is considering the introduction of Broadband over Power Lines (BPL). This proposal has been around for some time and there is not yet any clear indication from the ACMA as to whether it will eventuate, however if it does it is likely to cause such significant interference to the HF spectrum that it would render it useless. The HF industry therefore believe BPL will never succeed due to the enormous ramifications it would create. You can contact the Wireless Institute of Australia, and the Australian Communications and Media Authority (ACMA) for up to date details.


Although calls are free, they are not private because anyone could be listening in without your knowledge - anywhere in Australia. For long social or business calls this is generally a problem and therefore rarely used for this purpose. Be sure when you buy an HF radio that you are getting it for the right reasons - most radio calls will only be made for emergency or safety and co-ordination purposes.

Another important note is that long social radio discussions are infact a highly inappropriate use of this service, particularly if using one of the assigned frequencies to a club or network. Take note of the protocols if you join a network - they will have guidelines for your use of the airwaves. Bear in mind that suitable frequencies are usually limited for the number of people trying to use them so clogging up the airwaves with unnecessary banter is irresponsible.

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Created: June 2008
Revised: October 2017
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