Category Archives: Ham Radio

Klaus demonstrates his folding mag loop antenna

Many thanks to SWLing Post contributor, Klaus Boecker, who follows up after our recent post showcasing his homebrew magnetic loop antenna.

One of the cool things about Klaus’ antenna is that he can easily position it vertically (see above), or fold it over into a horizontal position (see below).

While one would think Klaus would get optimal performance from his loop while vertically-oriented, it’s not always the case. Klaus has discovered that on some frequencies, placing the antenna in the horizontal position lowers the noise level and increases the target signal’s strength.

To demonstrate, Klaus made the following short video for us:

https://youtu.be/pP0e7wnAjEY

Click here to view on YouTube.

That’s a pretty amazing difference, Klaus! I’m no antenna expert, but perhaps what’s happening is you’re eliminating noise that is polarized in the plane of your antenna, thus the signal “pops out” much better when oriented horizontally?

I’m curious if any readers can explain this.   I know very little about loop antennas–especially small loops since so much of their surroundings affect their performance.

Thanks for sharing, Klaus!

GigaParts opens new distribution center in Las Vegas

(Source: Southgate ARC)

GigaParts opens new distribution center in Las Vegas

After Amateur Electronic Supply went out of business in July, GigaParts began hiring the AES staff in Las Vegas and working on moving the operation to a new location less than 5 minutes from the famous Las Vegas Strip and just 3 miles from the former AES building.

Although the retail showroom won’t be ready for visitors for another few months, starting today, the Las Vegas store becomes the primary distribution center for GigaParts shipments to the western half of the US. That means fast, affordable shipping to the huge population of hams in California and other western states, without sales tax!

Former AES customers will see some familiar faces at GigaParts Las Vegas, including AES’s former shipping manager, Terry Spaulding, and store manager, Julio Suarez. “I’m excited to be back and I’m looking forward to helping all of my old friends again,” said Julio. “AES was iconic in ham radio and it was sad to see it die off, but we have an opportunity with GigaParts to do things better than we ever could before,” he continued.

In addition to the new and improved facility, another improvement over the AES business model will be a single toll free number for customers wishing to place orders by telephone: (866) 535-4442. Sue Stephens, Customer Service Manager for GigaParts: “Technology has come a long way in the 70 years since AES first opened. Our state-of-the-art call center in Huntsville handles calls and online chats from all over the world. The guys in Las Vegas are going to be a huge asset to us by helping with employee training, adding new product lines and even backing up our reps on the phones during peak call times.”

Jeff Sinclair, the e-Commerce Division Manager at GigaParts, states, “This is a significant move forward for GigaParts as we continue to expand our distribution capabilities in North America. The new facility in Las Vegas doesn’t just mean faster shipping to our west coast customers, but the employees there add decades of experience in customer service and ham radio product knowledge.”

Initially, the Las Vegas store will carry the complete lines of amateur radio and maker equipment with more product lines being added later. Understanding that hams come to Las Vegas from all over the country and all over the world, GigaParts plans on making the retail showroom more of an interactive showcase of the latest equipment rather than a self-service shopping experience common amongst other amateur radio outlets. Today, GigaParts Las Vegas is stocked with ham radio gear and is ready to fill your order! To welcome AES customers, GigaParts is offering a $25 gift certificate to every former AES customer.

See www.gigaparts.com/AES for details

Icom IC-7200 back in production

Many thanks to SWLing Post contributor, Dave Zantow (N9EWO), who writes:

Just FYI. Yes, the Icom IC-7200 is “Back in Production”

” The Icom IC-7200 HF DSP Transceiver is back in production once again (at least for now). Unknown if any part / design changes had to be made to make this possible ? Let’s hope they are using better quality Chinese fans ?? We TRIED 2 brand new samples near the end of the last run and it’s internal “Dual Mini Chinese Fans” BOTH squealed like a pig.[…]”

See my news page for the latest info on this (among other latest happenings including a bit more on the Sangean 909X saga).

http://webpages.charter.net/n9ewo2/news.html

Thank you, Dave, for the tip!

I believe the Icom IC-7200 has one of the best general coverage receivers on the market under $1000. I pointed this out in my General Coverage Transceiver review from 2014. I should hope that ham radio clubs might take note about the re-introduction of the IC-7200 and consider purchasing it over the less expensive IC-718 for Field Day or club station use. I’m no fan of the IC-718 as it’s a miserable performer in RF-rich environments like Field Day and radio contests.

BITX40 Goes Digital

Many thanks to SWLing Post contributor, Pete (WB9FLW), who notes that Ashhar Farhan (VU2ESE) has upgraded the BITX40 Transceiver with a Arduino Nano/Si5351 VFO:

http://www.hfsigs.com/

The BITX40 is an affordable, fully assembled QRP transceiver  we’ve mentioned on the SWLing Post before–click here to read more.

Thanks for the tip, Pete!

Klaus’ magnetic loop antenna in “urban camouflage”

Many thanks to SWLing Post reader, Klaus Boecker, who originally posted these images of his homebrew magnetic loop antenna on the Shortwave Radio Station Listening Facebook page.

I love the design of his mag loop which easily allows for a vertical or horizontal orientation.  Kaus has discovered, in certain cases, places the loop in a horizontal position dramatically decreases the noise level.

Having a little fun with what I call “urban camouflage” Klaus recently decorated his antennas to match the neighborhood flower boxes!

I’m sure more than one neighbor may be wondering what sort of creative floral arrangement Klaus has planted! 

Klaus notes that the vertical to the left of the loop is a a 2m / 70cm J-Antenna.

Thank you again, Kalus, for allowing me to share your images here on the SWLing Post.  I imagine your modest home-grown antenna farm works some serious DX on occasion!

Thanks again for sharing!

Readers: Have you camouflaged or decorated your antenna(s)?  Please share your photos!

Looking at HF OTH RADAR

Many thanks to SWLing Post contributor, Trevor, who shares this link to a blog post from Daniel Estevez describing the characteristics of HF OTH RADAR:

Most amateur operators are familiar with over-the-horizon radars in the HF bands. They sometimes pop up in the Amateur bands, rendering several tens of kilohertzs unusable. Inspired by Balint Seeber’s talk in GRCon16, I’ve decided to learn more about radars. Here I look at a typical OTH radar, presumably of Russian origin. It was recorded at my station around 20:00UTC on 8 December at a frequency around 6860kHz. This radar sometimes appears inside the 40m Amateur band as well.

Above this post you can see a waterfall plot of the radar signal. It’s the wide red signal. It is 15kHz wide and pretty strong, but severely affected by frequency-selective fading. Looking at the IQ recording in Audacity, it is clear that the radar uses pulses with a 50Hz repetition rate. This explains the characteristic sound of this radar when received with a conventional SSB radio. It sounds similar to AC hum (here in Europe, of course).

Continue reading on Daniel’s blog…

Updates to the Morse Pad app

Many thanks to Chris Smolinski, who shares the following update:

I have a new version of Morse Pad for the iPad/iPhone/iPod Touch.

This update includes an improved decoder which better handles improper dot / dash / space timing by the sender (poor fist), automatic speed (WPM) algorithm, and adds AFC (Automatic Frequency Control), which auto tunes in the strongest signal present.

App Store Link: https://itunes.apple.com/us/app/morse-pad/id385629886?mt=8