Antenna + ground

Posted on December 31, 2023 by Kevin

When I was a young shortwave listener 56 years ago, I had a Lafayette KT-340 desktop radio with connectors on the back for an antenna and a ground. I always hooked up my 75-foot long wire to the ANT post and connected the GND post to a water pipe or something. Life was good.

Me with Lafayette KT-340 desktop radio (lower left)

Nowadays, I have many portable radios and, with the exception of my vintage Panasonic RF-085, there aren’t any explicit ground connections. Still, several of my portables have an external antenna jack that take a phone plug with a sleeve and a tip connection (the tip to the antenna and the sleeve theoretically to the ground). One reads online not to bother with a ground on these radios, but I’ve had a different experience sometimes, and in this blog article, I want to describe one of them.

I’ve often said that I don’t get longwave where I live — there is just nothing on. Today, I was trying to receive an experimental broadcast on LW; I took my Tecsun PL-990 radio outdoors to my 20-foot wire up a tree (WUT) antenna where there is also a copper ground rod to see if I could catch the station. No luck, but as I was scanning LW just for grins, I came across a very strong AM Morse signal repeating “MSQ” on 351 kHz. It’s located in Culpeper, Virginia, broadcasting with a reported power of 25W (elsewhere I’ve seen 10W). This is no once in a lifetime DX reception, as that airport is only 43 miles from me.

Non-directional beacon MSQ, Culpeper VA

Now here’s where it gets interesting. As I said, the station was quite strong on my PL-990 with the WUT antenna connected to the external antenna tip and the ground rod to the sleeve (and the radio switched to use the external antenna). When I attempted to receive the station on the internal ferrite antenna, there was nothing whatever, zilch, nada. I went back to the external antenna but disconnected the ground. The station was barely audible. Signal strength with the ground was 19-20 dBμ, and without 4-6.

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Semier SM-838: Review before donation

Posted on December 27, 2023 by Kevin

OK, I had to have a radio under the Christmas tree, and as the last thing I really needed for Christmas was another radio, I went to the bottom of the barrel for this Semier SM-838 at the sale/coupon price of $9.99 plus tax (battery included). The sale price on Amazon today is $16.49 without coupon. So, is it better than its price-equivalence in Happy Meals?

Semier SM-838 radio
Semier SM-838 (Amazon product photo)

Features

It’s a shirt-pocket MW/FM/SW radio plus MP3 player. It covers the MW band from 520 – 1720 kHz with 10 kHz step, FM from 70 – 108 MHz and shortwave from 2.3 – 21.95 MHz. It comes with an instruction sheet, internal battery, USB-C charging cable, wrist strap and earbuds. The radio has a lighted display with 5 buttons, two side wheels and a switch. The non-user-replaceable lithium-ion is described as 1000 mAh. There is no clock.

Functional features include Auto Tune Storage (ATS) on each band. The instruction sheet doesn’t say how many ATS memories there are, but the number seems to be 50 on each band. It has only 2 digits to the right of the decimal for shortwave frequency display, leaving the resolution at 10 kHz, although it seems like the radio tuning wheel clicks twice between each advance in the display. The instruction sheet says that the SW step is 10 kHz. I was able to receive a strong station on 7.355 MHz when tuning the radio to 7.35 and 7.36.

The instructions say max audio output is 3W, and indeed the radio can be turned up very loud. The battery is only 1000 mAh, so operating the radio at its higher volume levels will deplete the battery fairly soon. This is less of an issue for personal listening or when using the supplied earphones.

This radio is tiny: 101.7 *18 * 56 mm. The antenna is 250 mm (10″).

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Ex-radio

Posted on December 26, 2023 by Kevin

When I write a review of a radio for Amazon, I’ll often try to gain credibility by saying “I’ve owned over 100 radios…” and that’s true. I currently have 39 radios (not counting car radios and clock radios). What happened to the rest of them? Let’s see:

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Goodbye PL-880

Posted on December 23, 2023 by Kevin

It became obvious some time ago that it made no sense to own both a Tecsun PL-880 and a PL-990 portable shortwave receiver. I knew one of them should go — but which one?

The PL-880 had the best speaker of any radio I’ve owned. The bass was fantastic. It was also smaller than the PL-990. The PL-990, on the other hand, has the ability to use an external antenna on MW and supports synchronous detection. In the end, I found myself using the PL-990 and not using the PL-880 very much.

The PL-880 sold on eBay for a stunning $141.

I’m eyeing an XHDATA D-608 to buy with some of the proceeds when it finally goes up for sale. It’s a yellow emergency radio (solar and crank power) that seems to be similar internally to their D-109WB. Then the Mesqool CR-1009 Pro will go down to the Goodwill Store (it works OK but it’s now well-designed for shortwave).

Update: XHDATA sent me a free D-608WB in exchange for my help in improving the manual (or maybe just because they think I’m an influencer). In any case, I don’t recommend it.

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Battle of the under $50 shortwave radios: Take 2

Posted on December 12, 2023 by Kevin

It’s only been 5 months since 13 shortwave radios did battle in the original Battle of the under $50 shortwave radios, but things have changed. There are new contenders.

XHDATA D-109WB

XHDATA D-109WB (top) and D-109 (bottom)

The XHDATA D-109 (shown above) was the winner of the first contest, a general coverage DSP based MW/LW/SW/FM radio that is an all-around good performer in its price class with notably good audio. There is a new model now, the D-109WB that adds, as you might expect, Weather Band. Reports are that the new kid performs the same as its older brother, so we’ll assume they are the same and to simplify things I’ll not revisit the D-109 in this challenge. I covered the original D-109 in my article, XHDATA D-109: A new radio. In addition to weather band, the D-109WB adds a Local/DX setting, tone control, an SOS siren and rubber buttons.

It is important to know that I live in a very weak MW signal area. People in areas with strong MW areas find shortwave on the D-109 radios almost unusable do to MW breakthrough.

Sihuadon R-108

Sihuadon R-108 (Amazon Product Photo)

The Sihuadon / Radiwow R-108 is my latest addition. I describe it as a “Mini Me” version of the Sihuadon / XHDATA D-808. The two radios are operationally similar and share many of the same features, operation and foibles, but without SSB and FM RDS on the R-108. The R-108 is significantly smaller, making it a better option for travel. Interestingly, it retains the AIR band feature. It also has a far better Operations Manual. Unlike the D-808, ATS memory is not divided into pages, simplifying operation.

LiJiANi Rd239

LiJiANi Rd239 (photo by author)

The Rd239 is an interesting new radio both for its coverage of Weather Band, VHF and Air Band, but also because it has an internal recording feature. It is the only conventional shortwave receiver I know of that has user-updatable firmware. The one tested here is version 2.9. My review of this radio is, LiJiANi Rd239: A different radio. I’ve previously compared the Rd239 and the D-109WB.

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Updating the LiJiANi Rd239 radio firmware

Posted on December 5, 2023 by Kevin

I bought my LiJiANi Rd239 in November of 2023, with Version 2.8 firmware. Prior to November, the radios had V2.7, and now in December, I’ve learned it’s 2.9!

I emailed the address in the user guide and they sent me the 2.9 release notes and firmware update with this warning:

Be careful when upgrading. If you cannot completely copy the upgrade file to the RD239, the radio may become bricked. There have been two cases. Please test the TF card before upgrading to ensure that the TF card is intact.

I plugged a 16G card into my computer and ran the check disk utility, then following the instructions provided in email:

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XHDATA D-109WB vs LiJiANi Rd239 Multiband Receivers

Posted on November 29, 2023 by Kevin

These two radios, arriving within a couple of days of each other, cry out for comparison. Both are in roughly the same price range: the Rd239 was $39.80 delivered from Amazon (Black Friday sale) and the D-109WB costs $46 including shipping direct from the manufacturer in China. They both cover MW/SW/FM and NOAA Weather coverage with alerts. The XHDATA adds longwave and the LiJiANi adds AIR and VHF bands. Both have auto tune storage (ATS), rechargeable batteries, MP3 players and an external antenna jack.

I’ve reviewed the LiJiANi Rd239 already and the non-weather band version of the XHDATA D-109. Here I’ll talk about the new features of the XHDATA weather band version, but mostly focus on the differences between the radios.

XHDATA D-109WB

XHDATA D-109WB (top) and XHDATA D-109 (bottom)

The NOAA weather version of the D-109 will be familiar to owners of the original. Added are the 7 NOAA weather channels with alert, SOS button that emits a loud siren, a Local/DX setting and a Voice/Music setting.

Because features have been added without adding buttons, some shifting and doubling of function was inevitable. The ST/B (stereo/beep) button is replaced by long presses of the 6 and 4 buttons respectively, and specifically, the beep is disabled with a long press of the 6. The separate VF and VM buttons (something I liked) are now handled by one VF/VM button. The Sleep function is now an overload of the power button. SCAN is replaced with a long press of the VF/VM button. One “upgrade” with the weather band version is rubber buttons instead of hard plastic ones.

Manual band scanning on the D-109WB is frustrating. It has automatic dual tuning speed on the tuning knob. That is, if you turn slow it increments at one rate, and if you turn fast, it increments at another, so you turn faster to pass the 20 spaces between US FM channels, only to have the radio shift into fast mode and shoot past them and you have to go back and forth and back and forth. The up and down buttons are always in slow mode. This is probably the worst feature of this radio.

The manual that comes with the D-109WB has rather small print, so I use the PDF version from the XHDATA website.

LiJiANi Rd239

I’m still getting used to the LiJiANi. It has an overload of features and quirks. My previous review of it may get updated.

The online version of the LiJiANi manual is online at Amazon for version 2.9 of the firmware.

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