Category Archives: Shortwave Radio

Dr. Phil’s radio articles: portable SDR and pocket DX

SWLing Post reader, Dr. Phil, recently contacted me regarding a collection of articles he’s written about DXing and radio modifications.

His site actually has a number of useful articles that I’ll plan to convert to future posts, with his permission.

I asked Dr. Phil for links to two of his most popular publications. He replied:

My two big recent articles are shown below. One is about “Pocket Radio DX”: using under-$20 radios to DX (started in 2003). Click here to download as a PDF.

The other is about using an $18 NooElec TV-tuner as a MW and shortwave receiver. Click here to download as a PDF.

Brilliant! Thanks so much for sharing these, Dr. Phil!

I actually have a Sony ICF-S10MK2, which I consider to be a capable and useful little AM/FM receiver for the sub $20 price. I’ve also been very tempted to purchase an RTL-SDR dongle, so I may go ahead and bite the bullet on one of the NooElec SDR dongles.

Shortwave Radio Recordings: Radio St. Helena

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Many thanks to Shortwave Radio Audio Archive contributor, Brian Smith, who shares the following recording of Radio St. Helena Day 2006 and notes:

“Beginning in 1990, Radio St. Helena was known for transmitting an international shortwave radio broadcast only once a year — and sometimes not even that — on a frequency of 11092.5 kHz USB. I managed to hear its 2006 broadcast to North America for about an hour on Nov. 4 and 5 UTC (straddling the 0000 hour).

Because of its relatively low power, it was never an easy catch in the American Midwest. That’s why this recording, which lasts just over an hour — I spliced together both sides of a cassette — captures a signal quality that is merely fair at best. But that was typical of Radio St. Helena, whose 1 kw signal in 2006 (it was 1.5 kw in the 1990s) seldom packed much of a punch.

I was listening on the borrowed rig of a now-deceased friend, Mike Koss, W9SU, and have long since forgotten the type of radio (probably a ham rig) he let me use. However, if memory serves, it was attached to a Beverage antenna that stretched across his 10-acre property in the heart of Indianapolis.

Mike deserves the lion’s share of the credit for the creation of this recording.”

In all of the years I tried to hear Radio St. Helena’s annual broadcast, timing never worked on my end; either I was travelling, the station had transmitter problems, or conditions were simply too poor. Many thanks for sharing this recording with us, Brian!

Click here to download the recording as an MP3, or simply listen via the embedded player below:

Degen refreshes shortwave product line

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Many thanks to SWLing Post reader, Paul, who commented with a link to the new Degen DE221 “ultralight” radio: http://ebay.to/1fKWZ2m

Paul’s link lead to the discovery of several new Degen models, in fact. Many of the new models have the same form factor–and a slightly different model number–from their predecessors.

Degen DE221 (updated from Degen 321)

Degen DE22

Degen DE23

Degen DE26

Degen DE27

Degen DE36 (updated from Degen DE32)

There may be even more 2015 Degen models than those I listed here and, in fact, they could’ve been on the market for a while.

I’ve already purchased the Degen DE221 for review since its predecessor, the DE321, was an acceptable radio for the $20 price tag. The DE321’s analog dial made for very vague tuning, however, so I’m curious if the DE221’s new digital display will be a worthy improvement. At this point, I don’t plan to review any of the other models above.

LondonShortwave: “Scanning the skies”

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Many thanks to SWLing Post contributor, LondonShortwave, who shared (via Twitter) this video with recordings made with his portable SDR in a London park:

Brilliant recordings, LS, and amazingly QRM-free!

You can follow LondonShortwave on his blog and via Twitter.

Update: Sangean ATS-405 initial review

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After publishing my initial review of the Sangean ATS-405, I received feedback from several ATS-405 owners (via comments and email–thank you!) who do not have the internally-generated DSP “birdies” that plague my receiver on 800 and 1600 kHz AM. I strongly suspect my ATS-405 has a manufacturing defect of some sort.

Sangean is kindly sending me another ATS-405 review sample for comparison purposes. I will post an update to the initial review as soon as I’ve had the opportunity to evaluate the new sample.

Follow the tag ATS-405 for updates.

Mike’s thrift store find: a Panasonic RF-888

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Mike's Panasonic RF-888 (left) and his GE Super Radio II (right)

Mike’s thrift store Panasonic RF-888 (left) and his GE Super Radio II (right)

SWLing Post contributor Mike (K8RAT) writes:

I happened upon a good find of a vintage radio recently when I visited my local Goodwill store in a small city in Ohio.

Among the electronic equipment on a shelf I discovered a Panasonic RF-888. I was not familiar with this radio. The large speaker along with switches and knobs for features found on the better radios impressed me.

The price on the sticker read $3.50. I paid at the counter and motored away not knowing what a bargain I had received.

The RF-888 audio is very good on FM and good on AM. Sensitivity and selectivity are very good on both bands. The tuning meter is useful.

I recommend visits to local second-hand stores. You never know what you might find.

Mike, K8RAT

Many thanks for sharing this story, Mike, as it provides a good lesson for us all: never pass by a thrift store! I’ve never had the good fortune of finding a gem like the RF-888–or a Sony ICF-2010 like Vlado–but I shall keep searching.

Panasonic RF-888s sell on eBay for $100 US and higher–at $3.50, I’d say Mike snagged a deal.

Silicon Labs DSP chip homebrew receiver

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The Silicon Labs Si4730 series DSP receiver chip powers many of the portable shortwave radios currently on the market.

Manufacturers are not the only ones implementing the chip in receiver design, however; radio enthusiasts are too.

I recently discovered this short video by a Japanese hobbyist who implemented the Si4734 in his receiver design:

While I don’t speak Japanese, the author also has a webpage of detailed design notes you might check out (click here to view). I used Google translate for a rough English translation of the page.

Have any readers made a homebrew receiver from a Silicon Labs DSP chip? If so, please comment!

Click here to download the Si4734 product information sheet.