Category Archives: News

The Prof recommends the Sangean DAR-101

Many thanks to SWLing Post contributor, The Professor, who writes:

I’ve had one of these for along time, and it’s been pretty much the only way I’ve recorded radio for years. It’s an easy to use rock solid workhorse.

My biggest complaint is the lack of recording format choices, and I’ve long hoped there would be a firmware update to expand them. Sure, being able to record WAV files would be welcome, but I’m not really in need of that. What I would like is a broader range of MP3 encoding options, up to 320kbps. And of course, to be able record in mono or stereo. All MP3 options on everything are just stereo by default, because almost everybody is dealing with post 50s music in the MP3 format, and that’s always stereo. But AM and shortwave radio are of course only mono, as are phone conversations, which this device is specially outfitted to record.

It’s a waste of a channel. If it’s a mono source it’s a waste of space on the SD card just for starters. But don’t forget that the encoding rate is divided by two in a stereo format. A 160kbps mono file is equal to a 320kbps stereo file. So, a 192 mono file would be superior to a 320 stereo file. Of course, I could get into “joint stereo” and VBR and throw in more variables, but what I’m saying here is pretty much on point.

That said, AM broadcasting is rather limited in acoustical dynamics, at least as we know it. I’ve found that it’s very hard for almost anybody to hear any artifacts in a 32kbps mono recording of AM radio. It stands up to compression well. And it also stands up well to RE-compression. I often expand the MP3 files I make on this into mono WAV files and tidy them up and normalize and edit them. I never notice any artifacts in the MP3 encode I make of the resulting file(s). So, I’d like more encoding formats, but the 192kbps stereo option on the DAR-101 is fine for me in the end.

This recorder also makes a fine speaker for a laptop. When you hit record the first time the speaker monitors the audio source out loud. You press record again and it starts to lay down audio on the card. So if I want to use it as a speaker I just leave it in “ready to record” mode. Works fine.

And for you old cassette heads, it looks enough like a cassette deck, which is comforting I suppose. I think the wall wart AC power adds a little noise. I just make sure the batteries are charged when I’m going to use it. And sometimes it makes a difference to keep it a couple feet from your radio to avoid any little bit of RFI.

In general, I highly recommend the DAR-101. If anyone has any questions feel free to ask.

Thanks for sharing your review of the DAR-101 and your recommendations for recording amplitude modulation!

The DAR-101 is currently $87.95 on Amazon (affiliate link) and $99.95 at Universal Radio. I’ve also found used ones on eBay for as little as $50.70.

M.I.T. Radio Society: Public lectures covering all aspects of radio

Many thanks to SWLing Post contributor, Jennifer Waits, who notes that The Massachusetts Institute of Technology Radio Society (W1MX) and the Department of Electrical Engineering and Computer Science (EECS) are presenting a series of radio-related lectures covering a wide array of topics, “from the design of modern wireless communications systems and 5G, to software defined radio and satellite communications, to shortwave radio propagation, space weather, Radio Astronomy and more.”

The public lectures are announced here: http://student.mit.edu/iap/ns313.html 

All lectures are streamed live and archived on YouTube.

Jennifer notes that one of the most recent lectures focuses on shortwave radio and propagation:

Click here to watch on YouTube.

Click here to view the entire lecture playlist.

Thanks for the tip, Jennifer!

Tivdio V-115/Audiomax  SRW-710S: Keith approves of everything save battery performance

Many thanks to SWLing Post contributor, Keith Stephens, who writes:

Regarding the Audiomax  SRW-710S  radio.

I was very pleasantly surprised at more than one aspect of this radio.  First, it sounds like something with a much larger speaker.  It has the base capability of at least a 6″ speaker.  My favorite FM music station comes from a mountaintop repeater over 70 miles away.  The 710S is one of two radios I have tried through the years that brings it in clear and clean.  The other is a much bigger more expensive radio.  And of course, the voice quality of the local AM talk shows is excellent.  I lost my instruction booklet (as usual) but I do want to record the FM station for times when I am out of range.

It is a pity that I have to tell of a bad shortcoming on this wonderful radio.  Alas, I couldn’t believe it the first time it died at the end of three hours.  I thought I had a bad battery, but a fully charged new battery only lasts 3 hours!  I would pay twice the price for the same radio if it had a better battery life.  Please let me know if there is a better battery or the same radio with a larger battery.

Thanks for your mini review, Keith! Admittedly, I’ve never tested the battery performance of this set because I typically use it for short (1 hour) recording sessions.

Click here to read other reviews of the Audiomax  SRW-710S/Tivdio V-115.

Retailers:

Silicon Chip: Building a AM/FM DAB+ tuner

Many thanks to SWLing Post contributor, Mangosman, who writes:

[The January 2019 issue of the Australian Silicon Chip magazine] commences a series of construction articles on building your own DAB+/AM/FM receiver. Australia was the first country to start permanent high powered DAB+ broadcasting which was in Aug 2009.

It is now extensively used in Europe but in the UK there are only 4 program streams in DAB+ the rest are in DAB which uses a less efficient audio compression and poorer error correction for noise and reflected signals.

Click here to check out a preview of this article at Silicon Chip Online.

Thanks for the tip! Readers, please note that Silicon Chip requires a subscription or you must purchase the issue in order to read the full article.

Dave notes the Icom IC-735 makes an appearance in “Pole To Pole With Michael Palin”

Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who writes:

Now you just just had to talk about the Icom IC-735.

In the final episode from the 1992 BBC 8 part series “Pole To Pole with Michael Palin” (Bitter End), you will see a couple of IC-735’s used.

They are located about 7:04 and 28:08 (minutes) in the video:

https://www.dailymotion.com/video/x2iszgj

Click here to view the video in a separate window.

Thanks for sharing this, Dave. I absolutely loved this travel series and watched it many years ago.  I’m also a big fan of Michael Palin. I think it’s time to re-watch it especially knowing the IC-735 makes a cameo!

Free radio e-books for download

(Source: Southgate ARC)

There are a number of vintage radio and amateur radio related eBooks available for free download on the Gutenberg site

Among them is the 1922 edition of The Radio Amateur’s Handbook by A. Frederick Collins.

Jarno de Haan @PA3DMI tweeted this link that will display the books available:
http://www.gutenberg.org/ebooks/search/?query=radio

A. Frederick Collins
https://en.wikipedia.org/wiki/Archie_Frederick_Collins

Jeff is displeased with Sangean buttons

Many thanks to SWLing Post contributor, Jeff McMahon, who writes:

After my wife complained about our Sangean radio button problems, I made this post:

Our Sangean radios are good performers for FM reception and speaker sound. They are reasonably priced. For user-friendly radios to use throughout the house, the kind that my wife and daughters enjoy using, Sangean is the best bet.

However, for me a general use Sangean is not my first choice. Because I am an FM reception fanatic, I prefer more of a high-performance radio, the kind that has an SW port, so I can connect a wire antenna to the radio, which usually results in improved FM reception. That’s why I have a Grundig G4000A next to my bedside table. But for the rest of my family, it’s a Sangean affair.

However, I should point out a consistent flaw, one that my wife complained about this morning: Three of four of our Sangeans have button problems.[…]

Read the full article at The Herculodge.