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Many thanks to SWLing Post contributors Phil Brennan and London Shortwave for sharing the following story from The Guardian (my comments follow):
‘It’s essential’: outback workers fight ABC decision to ditch shortwave radio
For some living and working in Australia’s outback, shortwave radio is the only way they can listen to the ABC – and their main daily contact with the rest of the world. But the ABC will end the service in two weeks
“People that live out in contracting camps or mustering stock camps or outstations, and even a lot of the people who live in the bush on cattle stations, spend probably 100% of their waking hours out on the land and have very minimal contact with other human beings,” says Tracey Hayes, the chief executive of the Northern Territory Cattlemen’s Association.
“You can imagine how isolating that would be without having access to the outside world via radio during the day while you’re out in the workplace. But I don’t think they took that into consideration.”
Hayes is referring to a recent announcement by the ABC that, at the end of January, it would terminate its shortwave radio service, which broadcasts to the NT, Papua New Guinea and some parts of the Pacific region.
[…]For some people living and working in the outback, shortwave is the only way they can listen to the ABC.
AM and FM bands don’t have the geographic reach across the sparsely populated territory and online streaming and Vast satellite radio is largely only available at home, close to the required infrastructure.
But as essential as the service’s supporters say it is, they are few in number. And so the ABC decided in early December it would reinvest the $1.2m into bringing digital radio to Darwin and Hobart.
Hayes has spent her life on cattle stations. She suggests the ABC decision-makers on the east coast have little understanding of the isolation of outback living and how big a role the ABC can play in people’s mental and emotional wellbeing.
“It’s essential, to keep feeling mentally stimulated and feeling like you’re in touch with the world and the rest of the community, to listen to our national broadcaster,” she says, and accuses the ABC of “loftiness” in dismissing their reliance on shortwave.
Michael Mason, the ABC’s director of radio, said in December the broadcaster would service the “limited audience” of shortwave radio “through modern technology” instead.
Hayes says that technology is of little help to people who aren’t in an office or home, and she questions the fairness of the ABC sacrificing their only remote mobile service in order to give city-dwellers yet another way of tuning in.
“When I live in Darwin I enjoy listening to the radio via the broadcast app, I can hear it in my car, we don’t really need another one,” she says.
“I’d certainly like to see the provision of resources go to people to people who are already disadvantaged.”
[…]The ABC has largely dismissed the backlash, with the managing director, Michelle Guthrie, claiming just a handful of complaints had been made and many of them were from ham radio enthusiasts.
[…]ABC local radio is the official national emergency broadcaster and all Australians are instructed to tune in during events such as bushfires, floods and cyclones. Ranger services told the ABC’s Country Hour they relied on it during long remote trips, rather than secondhand reports over HF radio.
But the ABC has sought to reassure people emergency alerts and weather updates can still be heard, via the Bureau of Meteorology and the rural flying doctors service’s HF broadcasts. It’s also urged people to tune into VHF radio, primarily used by mariners.
“It’s not just about picking up the weather, it’s about picking up a lot more than that,” says Jay Mohr-Bell, a cattle station manager 100km southwest of Katherine.
“They’re discounting the value of everything else that’s being picked up – even just a bit of local news. You listen to a show like the Country Hour and it’s info you wouldn’t get anywhere else.”
Mohr-Bell claims he and others in the Katherine region approached the ABC a few years ago about moving local radio to the AM band so they could pick it up more often. He says the ABC refused at the time, specifically citing the shortwave service as a reason it was unnecessary.
“It just goes to show it’s a decision that was made and they don’t care about the consequences and it’s done and dusted,” he says.
[…]“You should be left in no doubt that the ABC has failed to adequately or properly assess the needs of Territorians who see shortwave as their only option.”
Mohr notes there are lower level ABC staff, including rural reporters, who understand the importance of the service, but there’s nothing they can do. It’s the final nail in the coffin for him.
“Once they shut this down for us out here, we’ve got no relevance with the ABC. We won’t be continuing to support them at all.”
The closure of the Northern Territory shortwave service reminds me very much of Radio Canada International’s closure in 2012. With the number of other quality international broadcasters on shortwave (The BBC, DW, Radio Australia, RFI, Radio Japan, etc.) and with the cuts to RCI’s programming from previous years, in comparison RCI wasn’t a big a player on the international scene.
However, the CBC North Quebec Service–which was relayed from the RCI Sackville site on 9,625 kHz shortwave–covered a vast broadcast footprint into the northern reaches of Canada. The North Quebec relay could be heard in remote First Nations communities scattered across Labrador, Quebec, Nunavut, Iqaluit, and even into the Northwest Territories. Many of these communities are only accessible by air or sea. The CBC replaced the service with FM relays, but of course the reach of an FM site in no way compares to that of a shortwave service.
Fortunately, some remote communities in Labrador and possibly further west can still receive the CKZN shortwave relay from St. John’s Newfoundland. At 1,000 watts of power, however, it has a less reliable reach than the North Quebec Service did for so many decades.
It’s easy to turn a blind eye to communities with which you simply have no connection. I would never fault a commercial broadcaster from pulling the plug when they have no viable audience to cover the costs of sponsoring their content.
When you have a public broadcaster like the ABC–which is funded in part by taxpayers from remote, rural communities–I believe the needs of the full audience must be taken into consideration and must be taken…well…seriously.
The ABC should revisit their published Diversity and Inclusion statement which specifically points out providing quality, diverse content in audience-accessible forms.
1.2 million dollars–while a lot of money to most of us–is a drop in the bucket when compared with other items in the Australian budget.
In reality? It sounds like the ABC isn’t even prepared to acknowledge the needs of their rural audiences, let alone address them.
SWLing Post contributor, London Shortwave, just posted a photo of his portable SDR setup on Twitter and noted:
“Portable spectrum capture lab back in operation. Grabbing the grey line hour on the 49 mb. Listening to Radio Fana!”
Wow! I love this go kit!
Looks like London Shortwave is running an AirSpy with Spyverter via SDR# on his Windows tablet.
Having played a lot of radio in the field, I think what’s great about this setup is the fact it’s all contained and properly laid-out inside the padded case. Simply open the case, deploy an antenna, and you’re in business! With all components inside the case, there’s much less chance a connector, battery, cable or SDR will be left in the field accidently. Quick deployment and quick pack-up time; that’s what it’s all about!
Great job, London Shortwave! I’m happy to see you’re back in the park capturing spectrum and logging DX!
SWLing Post contributor, London Shortwave, just published an interesting post on his blog. He begins:
I have been regularly recording the small spectrum window containing the endangered stations I mentioned in one of my previous posts. Three days ago I noticed something strange: a morse code transmission superimposed onto the Voice of Turkey’s signal on 9460 kHz.[…]
That’s my minivan parked in front of the RCI Sackville transmitting station in June, 2012. The site was closed by the end of 2012 and towers demolished shortly thereafter.
Recently, my friend and fellow archivist, London Shortwave, and I engaged in a discussion about creating a curated list of “endangered” shortwave radio stations.
The idea being we could use such a list to focus our efforts and those of the archiving community on recording broadcasters that were most likely to disappear in the near future.
London Shortwave published an excellent post about this on his blog.
Please comment either on London Shortwave’s blog, or on this post, and suggest any additional broadcasters we may have missed. Please include a link to news item(s) which may indicate the broadcaster faces closure.
Of course, this list and the categories are subjective–we’re simply using our best judgement in this process. Often, broadcasters can shut down with little or no notice.
SWLing Post contributor, London Shortwave, hit his local park today with his Tecsun PL-680 and Zoom H1 in tow, then recorded the final broadcasts of Radio Belarus. He has published a post on his blog with details and two recordings of Radio Belarus.
Many thanks to London Shortwave for also going out of his way to post both recordings on the Shortwave Radio Audio Archive! If you have a recording of Radio Belarus, we can add it as well.
Many thanks to SWLing Post contributor, London Shortwave, who is kindly sharing this guest post–a brilliant article he recently posted on his own website.
I’m very grateful: one of the most common questions I’m asked by readers is how to cope with the radio interference so many listeners and amateur radio operators experience in high-density, urban areas. If this is you, you’re in for a treat–just keep reading:
Dealing with Urban Radio Interference on Shortwave
Shortwave radio listening is an exciting hobby, but for many of us city dwellers who either got back into it recently or tried it out for the first time not long ago, the first experience was a disappointing one: we could barely hear anything! Station signals, even the supposedly stronger ones, were buried in many different types of static and humming sounds. Why does this happen? The levels of urban radio frequency interference, or RFI, have increased dramatically in the last two decades and the proliferation of poorly engineered electronic gadgets is largely to blame. Plasma televisions, WiFi routers, badly designed switching power adapters and Ethernet Over Powerlines (also known as powerline network technology, or PLT) all severely pollute the shortwave part of the radio spectrum.
Does this mean we should give up trying to enjoy this fascinating medium and revert to using the TuneIn app on our smartphones? Certainly not! There are many angles from which we can attack this problem, and I shall outline a few of them below.
Get a good radio
The old adage “you get what you pay for” certainly holds true even when it comes to such “vintage” technologies as shortwave radio. Believe it or not, a poorly designed receiver can itself be the biggest source of noise on the bands. That is because many modern radios use embedded microprocessors and microcontrollers, which, if poorly installed, can generate interference. If the receiver comes with a badly designed power supply, that too can generate a lot of noise.
So how does one go about choosing a good radio? SWLing.com and eHam.net have fantastic radio review sections, which will help you choose a robust receiver that has withstood the test of time. My personal favourites in the portable category are Tecsun PL310-ET and Tecsun PL680. If you want a desktop radio, investigate the type of power supply it needs and find out whether you can get one that generates a minimal amount of noise.
It is also worth noting that indoor shortwave reception is usually best near windows with at least a partial view of the sky.
Tecsun PL310-ET and Tecsun PL680, my two favourite portable shortwave radios.
Identify and switch off noisy appliances
Many indoor electrical appliances generate significant RFI on the shortwave bands. Examples include:
Plasma televisions
Laptop, and other switching-type power supplies
Mobile phone chargers
Dimmer switches
Washing machines / dishwashers
Amplified television antennas
Halogen lighting
LED lighting
Badly constructed electrical heaters
Mains extension leads with LED lights
Identify as many of these as you can and switch them all off. Then turn them back on one by one and monitor the noise situation with your shortwave radio. You will most likely find at least a few offending devices within your home.
Install an outdoor antenna
If you have searched your home for everything you can possibly turn off to make reception less noisy but aren’t satisfied with the results, you might want to look into installing and outdoor antenna. That will be particularly effective if you live in a detached or a semi-detached property and have a garden of some sort. Of course, you will need a radio that has an external antenna input, but as for the antenna itself, a simple copper wire of several metres will do. An important trick is making sure that the noise from inside your home doesn’t travel along your antenna, thus negating the advantage of having the latter installed outside. There are many ways of achieving this, but I will suggest a configuration that has worked well for me in the past.
Fig.1 Schematic for an outdoor dipole antenna.
I have used a three-terminal balun (positioned outdoors), and connected two 6 metre copper wires to its antenna terminals to create a dipole. I then connected the balun to the radio indoors through the feed line terminal using a 50? coaxial cable. In the most general terms, the current that is generated in the antenna wires by the radio waves flows from one end of the dipole into the other, and a portion of this current flows down the feed line into your radio. The balun I have used (Wellbrook UMB130) is engineered in a way that prevents the radio noise current from inside your house flowing into the receiving part of the antenna.
Wellbrook UMB130 balun with the feed line terminal disconnected
Antenna preselectors
There is a catch with using an outdoor antenna described above — the signals coming into your radio will be a lot stronger than what would be picked up by the radio’s built-in “whip” antenna. This can overload the receiver and you will then hear many signals from different parts of the shortwave spectrum “mixing in” with the station you are trying to listen to. An antenna preselector solves this problem by allowing signals from a small yet adjustable part of the spectrum to reach your radio, while blocking the others. You can think of it as an additional tuner that helps your radio reject unwanted frequencies.
Fig.2 Schematic of a preselector inserted between the outdoor antenna and the receiver
There are many antenna preselectors available on the market but I can particularly recommend Global AT-2000. Although no longer manufactured, many used units can be found on eBay.
Global AT-2000 antenna coupler and preselector
Risk of lightning
Any outdoor antenna presents the risk of a lightning strike reaching inside your home with devastating and potentially lethal consequences. Always disconnect the antenna from the receiver and leave the feed line cable outside when not listening to the radio or when there is a chance of a thunderstorm in your area.
Get a magnetic loop antenna
A broadband loop antenna (image courtesy of wellbrook.uk.com)
The outdoor long wire antenna worked well for me when I stayed at a suburban property with access to the garden, but when I moved into an apartment well above the ground floor and without a balcony, I realised that I needed a different solution. Having googled around I found several amateur radio websites talking about the indoor use of magnetic loop receive-only active antennas (in this case, “active” means that the antenna requires an input voltage to work). The claim was that such antennas respond “primarily to the magnetic field and reject locally radiated electric field noise”[*] resulting in lower noise reception than other compact antenna designs suitable for indoor use.
Interlude: signal to noise ratio
In radio reception, the important thing is not the signal strength by itself but the signal to noise ratio, or SNR. A larger antenna (such as a longer copper wire) will pick up more of the desired signal but, if close to RFI sources, will also pick up disproportionately more of the local noise. This will reduce the SNR and make the overall signal reading poorer, which is why it is not advisable to use large antennas indoors.
The other advantage of a loop antenna is that it is directional. By rotating the loop about its vertical axis one can maximise the reception strength of one particular signal over the others, once the antenna is aligned with the direction from which the signal is coming (this is termed “peaking” the signal). Similarly, it is possible to reduce the strength of a particular local noise source, since the loop is minimally sensitive to a given signal once it is perpendicular the latter’s direction (also known as “nulling” the signal).
It is further possible to lower the effect of local noise sources by moving the antenna around. Because of the antenna’s design, the effect of radio signals is mostly confined to the loop itself as opposed to its feed line. Most local noise sources have irregular radiation patterns indoors, meaning that it is possible find a spot inside your property where their effects are minimised.
Many compact shortwave loop antennas require an additional tuning unit to be attached to the loop base (much like the preselector described above) but broadband loops do not. Wellbrook ALA1530S+ is one such antenna that is only 1m in diameter, and it was the one I chose for my current apartment. I was rather impressed with its performance, although I found that I need to use a preselector with it as the loop occasionally overloads some of my receivers when used on its own. Below is a demo video comparing using my Tecsun PL680’s built-in antenna to using the radio with the Wellbrook loop.
As you can hear, there is a significant improvement in the signal’s readability when the loop is used.
Experiment with a phaser
Although the loop antenna dramatically reduces the levels of ambient RFI getting into the radio, I also have one particular local noise source which is way too strong for the loop’s nulling capability. Ethernet Over Powerlines (PLT) transmits data across domestic electrical circuits using wall socket adapters, as an alternative to wireless networking. It uses the same frequencies as shortwave, which turns the circuits into powerful transmitting antennas, causing massive interference. One of my neighbours has PLT adapters installed at his property, which intermittently become active and transmit data. When this happens, it is not merely noise that is generated, but a very intense data signal that spreads across the entire shortwave spectrum, obliterating everything but the strongest stations underneath. Fortunately, a mature piece of radio technology called antenna phasing is available to deal with this problem.
Fig.3 The principle of antenna phaser operation (adapted from an original illustration in Timewave ANC-4’s manual)
Signal cancellation using phase difference
A phaser unit has two separate antenna inputs and provides one output to be connected to the radio’s external antenna input. The theory of phase-based signal cancellation goes roughly as follows:
The same radio signal will arrive at two different, locally separated antennas at essentially the same time.
The phase of the signal received at the first antenna will be different to the phase of the same signal received at the second antenna.
This phase difference depends on the direction from which the signal is coming, relative to the two antennas.
The phaser unit can shift the phases of all signals received at one antenna by the same variable amount.
To get rid of a particular (noise) signal using the phaser unit:
the signal’s phase at the first antenna has to be shifted by 180° relative to the signal’s phase at the second antenna (thus producing a “mirror image” of the signal received at the second antenna)
its amplitude at the first antenna has to be adjusted so that it is the same as the signal’s amplitude at the second antenna
the currents from the two antennas are then combined by the unit, and the signal and its mirror image cancel each other out at the unit’s output, while the other signals are preserved.
Noise sampling antenna considerations
To prevent the possibility of the desired signal being cancelled out together with the noise signal — which can happen if they both come from the same direction relative to the antennas — one can use the set-up illustrated in Figure 3, where one antenna is dedicated to picking up the specific noise signal, while the other is geared towards receiving the desired broadcast. That way, even if the phases of both the noise and the desired signals are offset by the same amount, their relative amplitude differences will not be the same, and thus removing the noise signal will not completely cancel out the desired signal (though it will reduce the latter’s strength to some extent).
It is possible to use any antenna combination for phase-based noise signal cancellation. However, one has to be careful that, in the pursuit of removing a specific noise source, one does not introduce more ambient RFI into the radio system by using a poorly designed noise-sampling antenna. After all, the phaser can only cancel out one signal at a time and will pass through everything else picked up by both antennas. This is particularly relevant in urban settings.
For this reason, I chose my noise sampling antenna to also be a Wellbrook ALA1530S+. The additional advantages of this set-up are:
It is possible to move both loops around to minimise the amount of ambient RFI.
By utilising the loops’ directionality property, one can rotate the noise sampling loop to maximise the strength of the noise signal relative to the desired signal picked up by the main antenna loop.
Two Wellbrook ALA1530S+ antennas combined through a phaser
And now onto the phaser units themselves.
Phaser units
DX Engineering NCC-1 (image courtesy of dxengineering.com)
I have experimented at length with two phaser units: the MFJ 1026 (manual) and DX Engineering NCC-1 (manual). Both solve the problem of the PLT noise very well, but the NCC-1 offers amplitude and phase tuning controls that are much more precise, making it a lot easier to identify the right parameter settings. Unfortunately this comes at a price, as the NCC-1 is a lot more expensive than the MFJ unit. As before, a preselector is needed between the phaser and the radio to prevent overloading.
Below is a demo of DX Engineering NCC-1 at work on my neighbour’s PLT noise. I have chosen to use my SDR’s waterfall display to illustrate the nefarious effect of this type of radio interference and to show how well the NCC-1 copes with the challenge.
Cost considerations
Fig.4 Final urban noise mitigation schematic
It would be fair to say that my final urban noise mitigation set-up, shown in Figure 4, is quite expensive: the total cost of two Wellbrook antennas ($288.38 each), a DX Engineering phaser ($599.95) and a Global AT2000 preselector ($80) comes to $1257. That seems like an astronomical price to pay for enjoying shortwave radio in the inner city! However, at this point another old saying comes to mind, “your radio is only as good as your antenna”. There are many high-end shortwave receivers that cost at least this much (e.g. AOR AR7030), but on their own they won’t be of any use in such a noisy environment. Meanwhile, technological progress has brought about many much cheaper radios that rival the older benchmark rigs in terms of performance, with Software Defined Radios (SDRs) being a particularly good example. It seems fair, then, to invest these cost savings into what makes shortwave listening possible. You may also find that your RFI situation is not as dire as mine and you only need some of the above equipment to solve your noise problems.
Filter audio with DSP
If you have implemented the above noise reduction steps but would still like a less noisy listening experience, consider using a Digital Signal Processing (DSP) solution. There are a number of different approaches and products available on the market, and I shall be reviewing some of them in my next post. Meanwhile, below are two demo videos of using DSP while listening to shortwave. The first clip shows the BHI Compact In-Line Noise Elimination Module at work together with a vintage shortwave receiver (Lowe HF-150). The second video compares using a Tecsun PL-660 portable radio indoors on its own and using the entire RFI mitigation set-up shown in Figure 4 together with a DSP noise reduction feature available in the SDR# software package, while using it with a FunCube Dongle Pro+ SDR. As a side note, it is worth remembering that while DSP approaches can make your listening experience more pleasant, they can’t recover what has been lost due to interfering signals or inadequate antenna design.
Set up a wireless audio relay from your radio shack
The above RFI mitigation techniques can result in a rather clunky set-up that is not particularly portable, confining the listener to a specific location within their home. One way to get around this is by creating a wireless audio relay from your radio shack to the other parts of your house. I did this by combining the Nikkai AV sender/receiver pair and the TaoTronics BA01 portable Bluetooth transmitter:
Head for the outdoors!
So you have tried all of the above and none of it helps? As a last resort (for some, but personally I prefer it!), you can go outside to your nearest park with your portable radio. After all, if shortwave listening is causing you more frustration than joy it’s hardly worth it. On the other hand, you might be surprised by what you’ll be able to hear with a good receiver in a noise-free zone.
Acknowledgements
Many of the above tricks and techniques were taught to me by my Twitter contacts. I am particularly grateful to @marcabbiss, @SWLingDotCom, @K7al_L3afta and@sdrsharp for their advice and assistance over the years.
Thank you–!
What I love about my buddy, London Shortwave, is that he didn’t give up SWLing just because his home is inundated with radio interference–rather, he saw it as a challenge. As you can see, over the years, he has designed a system that effectively defeats radio interference.
I also love the fact that he uses an even more simple approach to defeating RFI: he takes his radio outdoors. A kindred spirit, indeed.
I encourage all SWLing Post readers to bookmark and search London Shortwave’s website. It’s a treasure trove for the urban SWL. We thank him for allow us to post this article in its entirety.
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