Killing the Noise: Part 3

Posted on June 23, 2025 by Kevin

For some reason the 1985 movie title, Remo Williams: The Adventure Begins, came to mind, perhaps mock titled for a sequel that was never intended to happen. This story keeps on going, and going. In Part 3 episode I track down the EMI emitters (or so I thought).

The first step was to power off the Invisible Fence containment system and disconnect its battery backup. The next step was to verify that the EMI problem continued and to make a quick sweep with a radio to see roughly where it’s heard. Assisting me in this exercise will be my wife who has agreed to flip switches on the electrical panel while I monitor the EMI, using a pair of Baofeng GM-15PRO GMRS 2-way radios (mobile phones are not cool) for communication.

WAIT!

I was all set to tackle the systematic disconnection of circuits in the house, first powering off the containment fence. With the fence was off, unlike last night, EMI wasn’t a problem. The putative second source was silent. CFRX sounded pretty good with my WOW antenna at the radio desk.

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Killing the Noise: Part 2

Posted on June 23, 2025 by Kevin

I’m plagued with radio interference. Here I continue my efforts to rid myself of it.

The Elephant in the Room

Katie

Katie is obviously not an elephant, but she casts an elephantine shadow over shortwave listening at my house thanks to:

Invisible Fence Boundary Plus® Containment System
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WUT v WOW

Posted on June 22, 2025 by Kevin

I often use and mention my Wire Up a Tree antenna (WUT). It’s about 20 feet long and runs diagonally up a tree. It 22 gauge “magnet wire” and because of its dark color, virtually invisible. It’s located some distance from my house. I selected the location for its reduced background noise — not great but reduced. Alongside the WUT, I have a copper plated ground rod, like the ones used for grounding residential electrical systems. If the radio has an external antenna jack, then both the antenna and ground are connected. The antenna runs north – south. For more on the antenna and ground, see Antenna + Ground.

But as Yoda knowingly commented: “there is another.” It runs out a window and connects to a tree, close to 40 feet long running east – west. I hadn’t named this antenna before, just calling it my New Year’s Antenna, but “wire out a window” really sounds like “WOW” to me. The wire is 20 gauge silicon insulated stranded copper wire. There is also a ground rod. The antenna and ground connect to a 1:9 balun that feeds a coaxial cable with SMA connectors from the window to my radio desk. [The unneeded under-window cable has since been removed.]

1:9 Balun on WOW Antenna

The WOW has had a hard life, taken down by weather and falling branches 3 times, but it’s easy to repair. The insulator next to the tree is one I got when I was in high school in the 1960’s. It’s a keepsake. The other one of the pair is on the WUT.

Press Pause

This article is paused until I can deal with the interference problem that’s making the WOW antenna unusable. See: Killing the Noise: Part 3.

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A Little More Radio: ATS Mini

Posted on June 20, 2025 by Kevin

One thing was painfully obvious in my Little Radio Review, the ATS Mini isn’t very loud. I have a solution, hooking up the radio via audio cable to my Sony SRS-XB20 speaker. The problem with that solution is that the SRS-XB20 is heavy and won’t fit in my radio bag and certainly not in a pocket. I paid $48 for this in 2017 but Amazon sells it today for $124.99! Stereo versions get into serious money.

Sony SRS-XB20 Speaker

Wireless transmitter

Digging around in a drawer, I found an OiDiPi BT6 Wireless Transmitter/Receiver I had bought in February of 2024 for some reason that escapes me now unless it was because it was under $10 on Amazon.

So I gave it a try.

ATS Mini radio, OiDiPi BT6 Wireless Transmitter / Receiver and Jazmm 213 Radio / Bluetooth Speaker
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A Little Radio Review

Posted on June 19, 2025 by Kevin

Several small shortwave radios reside in my accumulation and I’m interested to see how they compare, especially how newer ones compare to older ones. At least a dozen of my radios fit the “Ultralight” category (volume under 20 cubic inches), including some serious radios like the Tecsun PL-330 and the Qodosen DX/SR-286. While those radios are small, I don’t consider them “little,” and little is more the concept I’m going for here. So here is a little list:

  • Amnvolt ATS Mini (V3)
  • Degen DE-15
  • HanRongDa HRD-701
  • Jazmm 213
  • Raddy RF75A
  • Raddy RF760
Little Radios: ATS Mini, HanRongDa HRD-701, Raddy RF75A, Degen DE15, Jazmm 213, Raddy RF760
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First Impressions: Jazmm 213

Posted on June 16, 2025 by Kevin

Kudos to Amazon who delivered the radio less than 12 hours after I ordered it. The package includes box, radio, User Manual, Thank You card and USB-C charging cable.

Jazmm 213 Portable Radio / Bluetooth / MP3 player

First Impressions

Like Amazon reviewers, I found it smaller than expected, even though the size was right there in the product description. It’s very close to the size of my Raddy RF760, but thicker because of the belt loop. But while the two radios are the same height, their antennas are very different. The Jazmm 213 has an antenna of 11″ (28 cm), while the Raddy antenna is 18 1/2″ (53 cm).

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Incoming Radio: Jazmm 6f9846ec-031e-4f5a-876d-0ee9460591cb

Posted on June 15, 2025 by Kevin

OK, it will soon be my birthday and so I blew a big $25 (after 20% discount) plus tax for a pocket shortwave radio. I asked Rufus (Amazon AI assistant) and it said the model number was: 6f9846ec-031e-4f5a-876d-0ee9460591cb, and apparently that really is the model number. I’m going to have a hard time remembering that. The manufacturer is Jimeng, and so far no manual is to be found online. Amazon, however, has a couple of videos that cover operation in some detail, one that appears to be from the manufacturer and one from a user who found what he described as “hidden features.”

Jazmm Bluetooth AM FM Shortwave Radio with NOAA Weather Alert

I’m a sucker for small radios, and this one seems pretty small, 2.3″L x 4″W x 1.3″H, although that’s a bit thick due to the speaker and belt clip. In addition to MW/FM/SW it adds weather band, Bluetooth and MP3 play. It may act as a computer speaker if “USB MP3 Play” means that. [Update: it doesn’t work as a USB speaker, nor does plugging in a USB flash drive do anything.] It’s described as having NOAA weather alerts. Shortwave coverage is 4.75-21.85 MHz. There is some sort of auto-scan feature with 100 station presets. The odd thing about this radio is that every picture of it online shows the same 162.585 MHz display, which is not a frequency the radio is supposed to receive.

My main reasons for the purchase was the high reviews given to the speaker, the small size and the flashlight. Negatives include a non-replaceable battery, product reviews saying shortwave was weak with the telescopic antenna, and the radio being on the thick side.

One Amazon reviewer thought it would be better without the belt clip. Another said the earphone output was mono on FM, but that it played stereo from MP3 files. Overall ratings were 4.3 stars.

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