Author Archives: Thomas

Herrington sale features Grundig shortwave radios

Many thanks to SWLing Post contributor, Troy Riedel, for sharing a link to this sale at Herrington, where a number of Grundig models have been discounted.

Looking through Herrington’s selection of Grundig radios, I feel the best deal is the Grundig Edition Field Radio above. It’s on sale for $99.95, but you must also account for shipping which could add an additional $15.95 (for a total of $115.90).

Amazon is selling the same Grundig Edition Field Radio for $129.99 shipped, but is also selling the upgraded version, The Grundig Edition Field BT–which includes Bluetooth connectivity–for $98.92 shipped.

I have not reviewed these receivers, so can’t comment on performance.

Click here to view the sale at Herrington.

Ross knows firsthand the importance of ABC/Radio Australia shortwave

Yesterday, we posted a news item regarding the importance of the ABC’s shortwave service to those working and living in the Australian Outback. It appears the ABC has no intention of reversing the decision in any meaningful way. A follow-up piece from The Guardian:

The ABC has remained steadfast in its decision to scrap the shortwave radio service, despite pleadings from federal Labor politicians in a meeting with the managing director, Michelle Guthrie.

Federal senator and cabinet minister Nigel Scullion has joined the calls for ABC to reverse its “city-centric” decision and maintain the service.

[…]“It was certainly a good meeting in terms of being able to thrash out the concerns of the people of the Northern Territory and stakeholders, but in terms of the outcome, it certainly wasn’t a positive outcome,” she said. “The ABC has disappointingly continued to forget about the people of the Northern Territory and those concerns.

“They’re still going ahead with the decision to remove the shortwave at the end of the month due to contractual issues. Michelle Guthrie is keen to come to the Northern Territory but clearly not until after the removal of shortwave.”[…]

[Read the full article at The Guardian.]

Many thanks to SWLing Post contributor, Ross, who has first-hand experience in rural, remote regions of Australia and shares the following:

As someone who spends a fair amount of time in remote areas of far Western Queensland and SE Northern Territory I regularly listen to Radio Australia broadcasts on my Pioneer 2 SW band truck radio.

The only reliable signals in English are Radio Australia, Radio New Zealand and China Drive Beijing. Local MW radio is virtually non existent during daylight hours with severe fading, FM just forget it , line of sight and no local transmitters for 100’s of kilometres.

Once again the city-centric values of Sydney/Canberra are imposed on those of us who live without the manifold benefits the coast and major cities take for granted.

A 100KW AM station broadcasting local ABC throughout Western QLD and southern territory would give us the road conditions, news, weather, flood/storm and fire warnings so necessary in a remote environment where conditions change quickly. [B]ut again HF facilities already exist, $1-2 million is a small cost and not if but when the digital/satellite networks fail HF will be more capable of maintaining communications.

Alternatively, smaller MW repeater stations relaying ABC maybe using microwave relay sites?
As for the comment that many of the complaints came from amateur radio ops , many of us use HF transceivers to keep contact over these large areas whether it be via the VKS-737 outback radio service, Royal Flying doctor radio service or the amateur radio network in an area where mobile telephone service is nonexistent and Satellite phones are not always reliable during severe weather events.

My point being that many of us have taken up HF for local and communications in comparison to other more populated parts of the country out of necessity for contact that city based politicians take for granted.

Not many homesteads (stations) in outback Australia without UHF and HF comms equipment and therefore the ability to tune in to the only reliable radio signals from R’Aust.

I have written to the local Federal member Bob Katter in MT ISA who I know is well versed in outback needs and trust he may be able to bang a few heads together in Canberra!

Regards,

Ross AKA Farmlad.

Thank you for sharing your comments, Ross.

Are there other SWLing Post readers who live and/or work in the Outback of Australia?  Please comment.

Outback workers fight closure of ABC’s shortwave service

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 ABC did not respond to questions.

Click here to read the full story on The Guardian.

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.

Southgate ARC: What Is a Balun and How to Make One Cheaply

(Source: Southgate ARC)

Ham Radio – What Is a Balun and How to Make One Cheaply

A Balun is a transformer which allows coaxial cable, which is an unbalanced lead to be connected to a balanced load, for example a resonant aerial.

The 1:1 balun is often called a choke balun, it works by eliminating Radio Frequency currents flowing on the outside of your coaxial cable, this is important because it prevents the pattern of the dipole becoming distorted and prevents the braid of the coaxial cable radiating.

Connecting coax to your resonant dipole which can be configured in a V shape or in a sloping fashion, however serious power loss and feeder radiation can occur without the use of a balun transformer. No one wants to induce Radio Frequency currents into Television receivers or Broadcast equipment as it may result in disputes with neighbours and could possibly lead to your station having to close down. Try to keep the centre of your aerial away from buildings as it may induce Radio currents into the mains wiring.

Building a choke is not difficult all you need is some plastic pipe available from many Do It Yourself outlets and warehouses. I use a length of about 1 foot of plastic pipe and 21 feet of coaxial cable, the length of the pipe and diameter is chosen because it works well if using R-G-5-8 coax the ends of the pipe can be sealed after placing a SO-239 connector for your coaxial lead. I use two bolts and solder tags at the other end of the pipe to connect the ends of the dipole to the choke.

When wrapping your coax around the pipe don’t use too much force as it may damage the inner braid and space the turns away from each other by a millimetre or two. R-G-2-1-3 coax around 21 feet used with 5 inch pipe will handle 400 watts pf power. Wire ties can be used to hold the turns together along the length of the pipe. Using these measurements your choke will cover all of the ham radio bands from 1.8 Megahertz through to 28 Megahertz and will keep the radiation pattern.

Using a dummy load connected to the choke and transmitting 100 watts from my transmitter indicated an S.W.R. readings of around 1.5 to 1 at 3.5 Megahertz when testing 28 Megahertz the S.W.R. reading came down to 1.1 to 1 which is an excellent match. Using the choke as it should be at the feed point of a dipole cut for 40 metres give an S.W.R. reading of 1.2 to 1. The highest reading was 1.5 to 1 when using 18 Megahertz but the rest of the High frequency bands gave me very acceptable matching.

By
John Allsopp G4YDM
https://g4ydm.blogspot.co.uk/

Article Source:
http://EzineArticles.com/expert/John_Allsopp/1925417

Article Source:
http://EzineArticles.com/9615600

Cloud-SDR: a remote access system for a number of popular SDRs

Many thanks to SWLing Post reader, Sylvain (F4GKR), who writes:

I am Sylvain, from Cloud-SDR, a new company selling software to get remote access to your existing SDR receivers through the Internet.

Coud-SDR

  • currently supports : SDRPlay, Perseus, BladeRF and AirSpy. LimeSDR to come when received and tested.
  • client software is free (can be used as standard SDR receiving software with locally connected devices),
  • server software starts at 110 Euros, VAT may be added depending on customer location,
    easy to use

From the Cloud-SDR website:

The Cloud-SDR Concept

You need a way to remotely access your existing SDR receiver? To stream your IQ samples to another remote computer over the network?

Cloud-SDR is a commercial software solution to enable real time RF data sharing or processing through the cloud.

Cloud-SDR can collect real-time IQ complex samples from an SDR hardware device connected on one machine, stream the samples to a second machine for demodulation or analysis, then send the resulting stream to third machine for storage.

In standalone mode, Cloud-SDR can execute signal processing tasks described with embedded JavaScript DSP engine.

Because network bandwidth is limited compared to SDR receiving bandwidth, the core concept of Cloud-SDR is to move the processing along the cloud to where it is required or possible : the DSP chain is divided in sub-tasks that are spread between computers interconnected through Internet.

Very cool, Sylvain!

I like the fact your system supports popular affordable SDRs like the SDRplay RSP & AirSpy and that you can stream your IQ samples.

Click here to read more on the Cloud-SDR website.