This radio goes back quite a few years, and in fact I had two of them: the Tecsun DR-920 and the alternate branded Lextronix E1100. I gave the Tecsun to a friend years ago who had been a ham radio operator and was terminally ill with cancer. [Documentary evidence unearthed shows that the DR-920 is not the one I gave to my friend, but something else. I sold the DR-920 on eBay. Still it reminds me of my friend.] I still have the E1100. Here are both:
Lextronix E1100 shortwave radioTecsun DR-920 shortwave radio
The radio is unusual, one of the few of its type, an analog tuned single-conversion superheterodyne radio with a digital frequency counter readout. It combines the best of both worlds: the smooth continuous tuning of an analog with the precise frequency readout of a digital.
I have a sentimental attachment to the radio because of my friend, now long passed, who got its twin, and so I note with sadness today the passing of my Lextronix E1100 radio.
The Lextronix E1100/DR-920 has a tuning wheel that’s connected through dial stringing and pulleys to a varicap on the circuit board. The varicap froze up and the dial stringing sprung. I couldn’t come up with any way to access the pulley mechanism without cutting a dozen wires that I have no hope of ever being able to repair. A photo of the destructive disassembly is included below.
Lextronix E1100 radio circuit boards
I think the best thing will be to replace it with a DR-920C that looks almost identical to the older model. A new one, I hope, will last longer than an antique, and will be just as good a memento.
The RF75A is slightly taller than the HanRongDa HRD-701, but much thinner. Here the already compact Tecsun PL-330 is shown in the rear. The RF75A’s actual dimensions are 92 x 53.2 x 26 mm. It’s also appropriate to show the two front radios together, since they both come from the same product lineage and share many concepts and features, such as the same memory systems and Weather alerts. They can be Bluetooth speakers and play MP3 files. The RF75A is also sold under the HanRongDa brand as model HRD-787 and Retekess as TR111.
While on the topic of the HRD-701, I hasten to praise the RF75A for an improved manual over the HRD-701 that calls the tuning knob a “pulley.” While improved, the Raddy manual still needs work where some of the sentences don’t quite make sense. The manual linked is newer in layout than the one that just came with my radio, but the text seems pretty similar. Readers here know that I have been very critical of radio manuals that are confusing, incomplete, incorrect, written in bad English and that omit critical information. The HRD-701 earned that criticism. The RF75A shows some improvement. I give it a B- grade (see Errata section at end).
Unboxing
The box contains:
Raddy RF75A radio
Hand strap
21-page Operational Guide
12-page APP Instruction Manual
Earbuds
External wire antenna with clip
USB-C data/charging cable
Oversized carry bag
Radio-C
What sets the RF75A radio apart from every other one I have owned is the app that not only allows you to control the radio as if you were pressing its buttons, but also adds features and buttons beyond what the base radio provides. The first example of that is the Record function: the radio can store what it is receiving on a MicroSD card, but recording can only be started with the app. The second feature really blew me away: you can press a single button on the app to set the radio’s clock from the phone’s clock. Probably the most useful app feature is direct entry of frequencies. In music play mode the listener can select the song by number.
Not only does the app provide remote control of the radio, but also remote viewing. The user can view the frequency set. It shows the file name of the MP3 file playing and even displays signal strength and S/N ratio, data not shown on the radio’s display.
The app is called “Radio-C” for Android and “Radio-CT” for iPhone. There is also an app for HarmonyOS.
Audio
The tiny 40mm speaker is rated at 3W, and the radio’s volume can be turned up to an uncomfortable level. It’s a good sound for such a small radio, but more suited for popular music than symphonic to my ear. The SOS siren is extremely loud (independent of the volume control). The Bluetooth connected tone is louder than it needs to be.
The long-awaited WebApp version of the World Radio Television Handbook is out. You can purchase it online for $24.90 USD or for $10 if you own the print edition.
WRTH WebApp Home sidebar and Map
As I write this today, it is at version 1.0.1, containing a number of fixes for things I complained about (like the missing article on RDS, scrolling problems on the iPhone and poor formatting of the receiver reviews). It looks more polished than it did just a couple of days ago, pointing out an advantage of the WebApp over the book: if something is wrong it can be fixed. [Update: it’s now (July 26, 2023) at version 1.3.2]
The WebApp (website) opens with a left sidebar of features, and a large world map. You can select topics from the sidebar, and if appropriate pick a country from the map (and optionally a list). The mouse scroll wheel can zoom the map so that individual countries can be seen and selected by double-clicking. One can also enter the country in the search box.
If you didn’t know already (and I didn’t) the section labeled COTB is for “Clandestine and Other Target Broadcasts.” This isn’t an abbreviation you will readily find on Google.
The WebApp lists names and contact information for all the stations, something not included in the printed book.
I have a number of radios that can store information in station memories, called “presets.” They all work differently. Here I include a brief review and say what I like best.
Radios use memories in two ways: to allow the radio user to store favorite stations for easy retrieval, and for automatic storage of stations found by the radio when scanning the bands. The number of memory slots and how they are managed varies between brands and between radios within brand.
ATS
ATS stands for “auto tune storage,” a feature where the radio scans some range of frequencies, and automatically stores the stations found in memory. ATS is convenient for the operator because they can do something else while the radio is scanning and then just go through what was found. The limitation of ATS is that some stations fade in and out, go on and off the air, or might be weak. Each of those conditions could cause a station to be skipped. ATS scans on shortwave often include only the international shortwave broadcast bands. A table at the end of the article indicates which radios have limited scans.
Following is a comparison of the memory systems in my radios (radios are listed alphabetically):
I don’t pay much attention to MW radio (typically called AM in the US) because FM sounds better and MW stations around here are typically full of political garbage, but perhaps I can find something of interest since I have a boatload of MW radios.
I live about 20 miles southeast of Charlottesville, VA, and I often say that it’s a weak MW signal area. My best radios get a maximum of 18 MW daytime stations on their internal loopstick antennas, some stations too weak to be intelligible.
Loopstick antenna
I looked up the 18 stations on those frequencies and the checked their coverage maps. Three stations considered my location “local,” three “distant,” five “fringe,” one on the border line between distant and fringe, and six beyond the fringe. There are only 55 daytime MW stations total within 80 miles of me according to the FCC.
The challenge is to receive all 55.
I already know that hooking up a 20 ft. piece of wire up a tree (WUT antenna) can improve MW reception dramatically; I made a video about that, showing how I could receive a beyond fringe station with a wire up a tree and ground that an already good radio couldn’t receive on its internal antenna.
Most radios, however, don’t provide connections for an external antenna on MW, and in fact my Panasonic RF-085, Tecsun R-9700DX and Tecsun PL-330 are the only three I have that do. The alternative is to wrap a few turns of wire around the radio to inductively couple the external antenna to the internal loopstick or to use what’s called a passive loop antenna that couples the same way.
Update: Testing found that several of my radios benefit on MW from clipping a long wire onto the telescopic antenna: They are:
jWIN MXM17
Kaide KK-MP903
Kaito WRX911
Degen DE28
Eton E1100 (aka Tecsun DR-920)
Panasonic RF-085 (antenna connector on back)
Prunus J-160
Tecsun PL-330 (antenna jack, hidden feature)
Tecsun R-9700DX (antenna jack)
XHDATA D-219
Phase one of the project is to use my current WUT antenna, and see what I can get. For that, I’ll need to pick a radio, and that process starts with determining which of my radios support external antennas on MW. Optimally, one of my good MW radios with a digital frequency display will work. The Panasonic and the Kaito are hot little MW radios with an external antenna, but it’s impossible to read the frequency accurately from their slide rule tuning display. I might not know what I’m listening to. The Tecsun PL-330 is digital, but not known for MW performance with its internal loopstick. The use of an MW/LW antenna on the PL-330 is a “hidden feature” activated by a “secret” long key press. For this and more hidden features, check out this article at SWLing Post
I thought I would try something else first, hooking up the Tecsun PL-330 to an outdoor MLA-30+ magnetic loop antenna. I did an ETM+ scan of MW and got 12 stations. That’s the same result that I get with the internal antenna. It was worth a try, but I can put that idea aside.
None of the rest of my of the digital radios listed improved with the connection of an antenna; however, I went outside at 2:45 PM local time and ran a band scan in ETM+ mode on the Tecsun PL-330 with my 20-foot WUT plugged into the antenna port, and got no fewer than 15 new stations on top of the 12 I had before. Then I scanned the frequencies by hand — what a surprise, I got 59 stations! That’s more than on the list I was going to try to find.
So what remains is verifying what those 59 stations are. I’ve started a Google sheet with the results, and will be updating that as I progress. What I know is that some of them are outside the 80-mile range I originally set up.
Update:
It’s now 2025, almost 2 years since I wrote this article. Since that time I have added two radios that should make a difference, the Tecsun PL-990 and Qodosen DX-286. Both of them have documented connections to the external antenna jack. Time for an update.
I write about radios a lot, and use the abbreviation MHz and kHz with frequencies, but I’ve always wondered why one is capitalized and the other is not. I asked ChatGPT:
Why is the first letter of the abbreviation MHz usually capitalized, but the first letter of kHz is not?
ChatGPT replied:
The reason for this difference in capitalization between “MHz” and “kHz” has to do with the SI (International System of Units) rules for unit symbols.
In the SI system, unit symbols are always written in lowercase letters, except when the symbol is derived from a proper noun. In the case of “MHz”, the unit is derived from “megahertz”, which is a combination of the metric prefix “mega-” and the unit “hertz”. Since “mega-” is a proper prefix derived from a Greek word meaning “great”, the first letter of the symbol “MHz” is capitalized to indicate this derivation from a proper noun.
On the other hand, “kHz” is derived from “kilohertz”, which is also a combination of the metric prefix “kilo-” and the unit “hertz”. However, “kilo-” is not a proper prefix in the same way that “mega-” is, so the symbol “kHz” does not capitalize the first letter.
It’s worth noting that while these rules are widely followed, there may be variations or exceptions depending on the specific context or style guide being used.
I didn’t quite follow the rationale, so I asked a follow-up question:
So why is “kilo-” not a proper prefix, but “mega-‘” is?
Find out who I am by reading my web site and I will find out who I am by writing it.
I’m writing this article to help myself answer the question of which is my favorite radio.
I have 37 radios right now. Some are super cheap (under $10), some I couldn’t give away on eBay, some are novelties, and a few are serious radios. The candidates for favorite shortwave radio come from the last category, and they are:
Eton Elite Executive
Sangean ATS-405
Tecsun PL-330
Tecsun PL-660
XHDATA D-109
XHDATA D-808
Eton Elite Executive
The Eton Elite Executive is the most expensive of these radios to buy (except I got it on a blowout sale under $80). It not only performs well, but it is also feature rich, including MW/FM/SW/LW/AIR, plus SSB and FM RDS. It has a convenient “scan for next station” function.
What I don’t like about this radio is that it falls over easily, and that the case is awkward to remove because of the antenna placement. I also don’t like its station memory system. Its automatic key lockout is also extra trouble. Auto tune storage (ATS) only works on FM. The F1-F7 keys do many things, and you need the manual to know what’s what. Other radios use the number keys for settings and include descriptive labels.
Eton Elite Executive radio (Amazon product photo).
Sangean ATS-405
The Sangean ATS-405 is a radio that I keep coming back to. It has a wonderfully clear display. The carrying case is efficient. It has excellent performance on MW. It has a convenient “scan for next station” function. It has controls for soft mute, tuning mute, AGC and squelch, but it lacks some things, like LW, Air band, SSB support, FM RDS and an external antenna jack. Also ATS is limited to MW and FM (and the number of memories per band is only 36). Shortwave sensitivity is the lowest among the contenders. A manual is required for some features.
AI generated content may appear occasionally in articles and will be denoted with the 🤖 [robot emoji] symbol. Content comes most often from Microsoft Copilot, but may also come from Perplexity, ChatGPT, Duck.ai, Grok or Deep Seek.
