Category Archives: Radios

Making A Transistor Radio by George Dobbs

A sample illustration from "How To Build a Transistor Radio"

A sample illustration from “Making a Transistor Radio”

Those of you who are ham radio operators (especially QRPers) are familiar with the name George Dobbs (G3RJV). In 1972, Reverend Dobbs wrote a book called, Making A Transistor Radio and now it’s available online.

Making A Transistor Radio is a clear, simple, step-by-step guide to building your own transistor radio. In each stage of the process you’re rewarded with a working radio. In addition, you’ll learn about all of the stages of a working receiver.

Perhaps what I love best about this book–besides the fact that is resembles the mountains of electronics books I poured through in my youth–are the illustrations.  Each illustration describes exactly how each component of the radio should be built, leaving nothing to be pondered.

If you’ve ever wanted to build your own radio, from scratch, this is a great place to start.

Thanks, Eric, for sending this link!

SDR Touch: An Android-based software defined radio

SDRtouchThough not available for the shortwave bands, Google Play reviews are mostly positive for the new software defined radio application that will run on your Android phone or tablet: SDR Touch.

According to the Google Play page, SDR Touch covers 50 MHz to 2.2 GHz and demodulates WFM, AM, NFM, USB, LSB, DSB, CWU and CLW signals. It requires an inexpensive USB rtl-sdr compatible USB DVB-T tuner. Click here to search eBay for RTL-SDR receivers. You then connect to your Android device via a USB OTG cable and SDR Touch should control the receiver.

SDR Touch’s Google Play website has a list of supported receivers–make sure to check the model number from eBay against this list before purchasing. Additionally, you should install their free demo SDR app to make sure your Android device is compatible.

This video shows SDR Touch in action on the FM broadcast band:

SDR touch claims that crashes should be expected as this app is still considered somewhat experimental.

Would be great if SDR Touch could support the HF bands some day.

Vlado’s thrift store find: A Sony ICF-2010

The Sony ICF-2010

Vlado’s Sony ICF-2010 (Click to enlarge)

While visiting my friend, Vlado, this weekend, he showed me his thrift store find: a Sony ICF-2010 in very good condition`. The ‘2010 is a well-known portable amongst serious DXers, and is highly sought-after. Since this radio has not been in production for many years, used models routinely sell for a price in excess of $200 US. Parts radios sell for $50 US or more.

We suspect that the previous owner thought it stopped working. You see, when Vlado plugged in the AC power adapter, nothing happened.

But take note: there is a quirk, at least with some ICF-2010s–they will not power up, even with the AC adapter plugged in, if you don’t have AA batteries installed. Indeed, two AA cells are required for either DC or 120 VAC operation. Once Vlad put AAs in, the radio came to life.

How much did  he pay for his Sony ICF-2010? Five dollars.

Paint me envious!

WinRadio Excalibur owners take note: 2013 may require a software update

WinRadioExcaliburFullScreenYesterday, when I attempted to start my WinRadio Excalibur software, I received an error message from Windows 7. No matter if I restarted my PC, re-installed the control software or the USB driver, I simply could not get the Excalibur software to launch.

I navigated to WinRadio’s software download page and found that on December 20th, 2012, they made a new version of the Excalibur software available to download: version 1.61.  This is the first official upgrade I have seen in months.

I uninstalled my old version (important: being careful to tell WinRadio not to remove my shared libraries!) and installed 1.61. I restarted my PC, launched WinRadio and all was back to normal (save, back to default settings, of course).

I then received a message from my buddy, Dave, describing the same problem with his Excalibur and noted that other users had complained about this in a WinRadio discussion group. This morning, I received a comment from a user on the SWLing Post describing the same problem.

I think it’s safe to assume the previous version of the WinRadio Excalibur control software could not deal with the year changing from 2012 to 2013. Not exactly Y2K, but a bit odd.

If you own the WinRadio Excalibur, I would encourage you to visit WinRadio’s software download page and upgrade to version 1.61.

Grundig G3 on sale at Universal Radio

The Grundig G3 shortwave radio.

The Grundig G3, one of my favorite full-featured portables, is now on sale at Universal Radio for $89.77.

The G3 would make an excellent gift for someone in your life who is interested in shortwave radio. I recently updated my review of this radio and even included it in our annual gift recommendations.

Not sure how long this sale will last.

The new Degen DE1129A sports RDS, but is there really a version with keypad?

Thanks to a tip from the Herculodge, I discovered the DE1129A: a version of the recently reviewed Degen DE1129 with RDS. RDS is a very useful feature–especially for instant FM station ID on the go.

The DE1129A is available from Anon, a trusted Degen distributor from Hong Kong, on eBay. I have purchased from them before and have been very pleased with their service. Click here to view their listings.

If you’ve been sitting on the fence about purchasing the DE1129, perhaps RDS will sway you toward purchasing this portable radio with integrated digital recording and playback.

Frankly, I was unimpressed by the DE1129. Though the radio has very good FM reception and an impressive little speaker with bass response,  I believe the majority of shortwave and medium wave radio listeners would be upset with its overall performance.  I can’t imagine that Degen’s updates would bring dramatically improved performance on the shortwave and mediumwave bands. If nothing else, the lack of a number pad to directly input frequencies, would put me off. Cruising through the shortwave bands at slow 5kHz steps with noted muting between frequencies make band-scanning a chore on the DE1129.

According to TecsunRadio.com, this image was altered by Degen to show what the DE1129 would look like with a number pad. It’s obvious that the image has been altered by Photoshop or another graphics application.

DE1129 Number Keypad?

Speaking of a number pad…earlier this year, TecsunRadio.com told me that there would soon be a version of the DE1129 with a number keypad.  They published a prototype image (see right). When I first saw this image, I could instantly see that it had been Photoshopped; obvious use of cloning tools and the fact that the number pad characters are not in alignment with the buttons really stand out. Still, for a prototype image, it gives you a good sense of what the final product will look like.

Within weeks, I started noticing the keypad version of the DE1129 appearing in search results on eBay and had assumed it was in production.

This eBay seller shows a version of the DE1129 with number pad, but the image is the Photoshopped image (see above) released from Degen earlier this year.

This morning, I opened an eBay listing of the DE1129 keypad version (see image on right) from pbuying.usa. Their listing clearly shows the same Photoshopped image from above. I then noticed that neither the product description nor any other image they feature indicates a number pad on the DE1129. I wrote a message to them this morning asking for clarification and will update this post with their response.

UPDATEpbuying.usa confirmed that his radio does not have a number pad and was apologetic and thankful that it was pointed out. The image has been removed.

I mention this as a note of caution: On eBay, you should always confirm any discrepencies before purchasing.  Though you could rightfully return the radio and get a refund, return shipping to Hong Kong/China (which you would pay for) could be in excess of $20-25 US.

By the way, though the addition of a number keypad on the DE1129 would make this radio at least 50% more usable, it would not sway me to recommend it because receiver performance is so mediocre. Check out my other review notes here.

I’m very curious if any SWLing Post readers have actually received a keypad version of the DE1129–please comment!