Category Archives: Mediumwave

Inside Radio: “Sale of Border Station Raises Chinese Propaganda Worry”

(Source: Inside Radio via Dennis Dura)

The proposed sale of an AM station along the Mexico-U.S. border to a group of Chinese investors has stoked fears that the 50,000-watt station will be used to infiltrate the U.S. with Chinese propaganda. Spanish news-talk “W-Radio 690” XEWW (690), which blankets Southern California from Tijuana, is being sold by Mexican broadcaster GLR to Chinese investment group H&H Group USA, owned by Vivian Huo, a U.S. citizen who runs the investment firm H&H Capital Partners.[…]

Click here to read the full article.

Bill tweaks his AM loop antenna for optimal mediumwave performance

Many thanks to SWLing Post contributor, Bill Hemphill (WD9EQD), who writes with the following update to his previous post:

As you may remember, back in May, I picked up a beautiful home-made loop antenna. It was 25 inches on a side with 23 turns of wire. My initial testing showed that it would tune from 280 kHz to 880 kHz. While I was familiar with loop antennas, I had never tried using one.

My initial tests were disappointing. So I spent some time on the internet reviewing AM loop antenna designs. I came across a reference to an AM Loop Antenna Calculator by Bruce Carter:

http://www.earmark.net/gesr/loop/umr_emc_calc.htm

I first measured the tuning capacitor and found that it tuned from 25 to 400 pF. Entering the data into the calculator:

This matches closely to what I was experiencing.

I then proceeded to calculate various Number of Turns to see the effect on tuning range. My goal was to tune the entire AM broadcast band.

I settled on ten turns which gives the following from the calculator:

Perfect. I removed 13 turns (which left ten turns) and then added a two turn secondary loop which would be connected to the radio. The results were fantastic.

I have created three short videos showing the difference between using the Tecsun S-8800 without the loop on a weak station and then using it with the loop.

[Note: If you’re viewing this post via our email newsletter you might need to view this post via a web browser to see the following embedded videos.]

Without the loop

With Loop

As you can hear, a very noticeable difference.

[After making these videos] I tested the of reception of 1510 kHz on the Panasonic RF-2200:

The results are amazing.

I have logged three stations on one frequency. Just peak the one station, then tune the loop and peak the second, then turn the loop some more and peak a third station.

I’m having a lot of fun with the loop. When it gets a little cooler, I plan to take it to the park where there is zero noise and really put it through its paces.

Excellent job, Bill! You’ve proven that doing a little research and making small adjustments to an antenna design can yield impressive results! Thank you for sharing!

August 2018 Rockwork Ocean Cliff DXpedition most distant AM-DX

Many thanks to SWLing Post contributor, Gary DeBock, who shares this note from the recent Rockwork Ocean Cliff DXpedition:

The most distant AM-DX received during the August 2018 Rockwork Ocean Cliff DXpedition was 558-6WA in Wagin, Western Australia, received during the last session (9 out of 9) at 1252 on August 9th. At 9,154 miles (14,732 km), the ABC “Nightlife” program content was matched to the related ABC website Podcast. The co-channel music is from 558-Radio Fiji One This was received on an XHDATA D-808 portable boosted by a 17″ FSL antenna:

Click here to download the audio file.

What an impressive catch, Gary! Thank you for sharing!

Gary shares some catches from the first day of the Rockwork 5 DXpedition

FSL Antennas poised to grab DX! (Photo: Gary DeBock)

Many thanks to SWLing Post contributor, Gary DeBock, who shares an update from the latest Rockwork (Utralight) DXpedition. Gary notes (in bold):

First day FSL antenna setup at the Rockwork 5 ocean cliff near Manzanita, Oregon (Craig Barnes in the photo)– outstanding conditions for 558-Fiji and 1017-Tonga!

558 Radio Fiji One Suva, Fiji Awesome signal with island music and medley song ID on the half hour at 1230 (including “Radio Fiji One, Na Domoiviti” at 1:36) :

Click here to download audio.

765 Radio Kahungunu Napier-Hastings, NZ The usual S9 signal from this 2.5 kW overachiever with distinctive Maori music at 1218:

Click here to download audio.

1017 A3Z Nuku’alofa, Tonga Monster signal with island music at the start of the session at 1221:

Click here to download audio.

Monster signal with island music near the close of the session at 1314 (in other words, all session long):

Click here to download audio.

Wow! Impressive catches, Gary! Someday I would love to join your team as you snag signals from the edge of the Rockwork cliff.

Thanks for sharing, Gary and good DX!

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