Category Archives: Ham Radio

Icom RS-BA1: Setting up the IC-7300 for remote operation

(Source: Southgate ARC and Dave Zantow)

New video: Icom RS-BA1. Installing & setting-up remote control for your IC-7300

The TX Factor have produced a video that logically goes through the step by step process of remote controlling an Icom Amateur radio, more specifically in this case, the IC-7300 using the RS-BA1 remote control software.

The video shows Bob McCreadie (G0FGX) of TX Films demonstrating:

• Setting up your computer and radio
• Installing the RS-BA1 remote control software
• Accessing the IC-7300 remotely
• Introduction to the RC-28 remote controller encoder.

To view this video visit:
Icom RS-BA1. Installing & Setting up Remote Control for your IC-7300 SDR Radio

To found out more about Icom’s remote control software, visit the
RC-28 IP Remote Control System page where you will also find a list of compatible Icom HF radios.

For more information about the IC-7300 visit the
IC-7300 HF/50/70MHz Transceiver product page.

Both the RC-28 IP Remote Control System and IC-7300 are available from all authorised Icom Amateur radio dealers.

Of course, you could use the RS-BA1software to use the Icom IC-7300 as a remote shortwave receiver. Click here to read our review of the IC-7300.

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Making a FlightAware ADS-B feeder with a Raspberry Pi 3 and RTL-SDR dongle

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It’s been nearly a year since I acquired both the RTL-SDR (above) and Rasperry Pi 3 (below)r.

Remember when I made a plea for Pi 3 projects just last year––?

Although many of you suggested some great projects, I never actually got around to doing any of them. Now, don’t get me wrong––I wanted to, of course, but simply got involved with reviews, NPOTA, two months of travel…and, well, life.

Then, last week at the Winter SWL Fest, a common theme emerged in both presentations and discussions: the numerous applications of the super-cheap, and thus super-ubiquitous, RTL-SDR dongle. In their engaging presentations, both Dan Srebnick and Mark Fahey––SWLing Post contributors and good friends––focused on the power of the RTL-SDR, expounding upon some simple, inexpensive applications in their forums. It was inspiring. Also, buddy Eddie Muro showed me just how easily an ADS-B receiver could be set up using an Android phone.

Back to the Pi. Though I was already aware the Pi 3 and RTL-SDR could be united to make an ADS-B receiver, watching Mark Fahey talk about how simply one could feed the FlightAware network with ADS-B data finally hooked me. Why not, indeed? Here was fun to be had!

Mark preparing to woo his captive audience at the Winter SWL Fest!

I couldn’t get the idea out of my head, so Tuesday, the day following my return, I set the afternoon aside. I rolled up my sleeves, and with my long-neglected Pi 3 and RTL-SDR, got ready to cook up a flight sensor.

I figured I was probably missing a component or two, and fully expected the process to be complicated, but decided I wouldn’t let this deter me. And guess what? I was wrong on both counts!

FlightAware ADS-B feeder recipe

Ingredients:

A computer to install the PiAware image on a MicroSD card
A Raspberry Pi (I use the Pi 3 which is available bare-bones and in starter packages like this one)
An RTL-SDR receiver, of which there are a couple of popular options:
- The RTL-SDR V3 (I like this package, which ships with antennas)
- The FlightAware SDR dongle with filter (no included antenna)
A MicroSD card (mine was 8GB, more than enough for this application), and
An antenna. This one is often used for ADS-B, though I found the smaller telescopic whip that shipped with my RTL-SDR dongle works well.

If you only plan to use this SDR and antenna as an ADS-B feeder, you might go for the FlightAware Dongle and 1090 MHz antenna combo.

Directions:

Note: I used this excellent PiAware ADS-B feeder tutorial to build my system–it’s detailed and doesn’t make the lofty assumption that you actually understand formatting cards, building disk images, and/or editing config text files.

Directions below are a highly distilled version of that tutorial. If you’re new to all of this, as I was, follow these directions instead of the above tutorial. Be aware that the directions assume you’re using the Pi 3 and a Windows PC to burn the image file.

Download PiAware image, 7-zip, SD card formatter, and the Win32 Disk Imager. Decompress all compressed files, install and note the folder locations.
Register your username at FlightAware–presuming you don’t already have an account, of course.
Use SD Card Formatter to format your MicroSD card. Just make sure you’re formatting the correct drive, else you could easily wipe the wrong disk/card!
Use Win32 Disk imager to write the PiAware image to your MicroSD card.
If using WiFi, open Windows Explorer. Locate text document called piaware-config on the MicroSD card, open it with a text editor, and locate the WiFi ssid and password locations. Per the config comments, edit them to match your WiFi system. Note that any special characters in both the name and password will require the use of quotation marks (again, noted in the config file comments). Save the file in the same location on the disc image.
Remove the microSD card containing the PiAware image; insert it into the Pi 3.
Connect the RTL-SDR or FlightAware dongle to the Raspberry Pi. Attach an appropriate antenna to the RTL-SDR. Note: You’ll get the best results if you place the antenna outdoors with line of sight to the skies.
Plug the Raspberry Pi 3 into a power source…and cross your fingers!
Grab a cup of coffee, walk the dog, or listen to this 12 minute version of the BBC countdown; it could take at least this long for FlightAware to start receiving data from your ADS-B feeder.
When you see this My ADS-B button in the header of FlightAware (see below), you’ll know you’re in business. Congratulations! You can now watch the skies.

Feeding FlightAware

After my ADS-B receiver had been in operation for a while, I was very impressed with the data FlightAware was able to pull from my ADS-B feed. I was equally impressed with the number of distant aircraft I could receive with such a modest antenna––a number of them up to 135 miles from my location. Once I find a suitable outdoor location for the mag mount antenna, currently indoors, I expect the reception distance will increase significantly.

You can also connect to the live feed from your ADS-B receiver through your local network. Here’s a screenshot of my live data:

Future plans

At the moment, my ADS-B receiver is located indoors, in a south-facing window.

It works, but clearly isn’t ideal. Since the Pi 3 connects to my network via WiFi, I intend to install the full ADS-B receiver system into a small weatherproof case and mount it outside. My Pi 3 has no case, so I purchased an inexpensive one yesterday. I should be able to feed it power with an outdoor outlet…but I’m very tempted to experiment with making it solar powered. To find out if this is a logical move, I need to observe and measure the power requirements first, and will be doing that in the next few weeks.

Meantime, I’m thoroughly enjoying watching the (amazingly busy) traffic in the skies…and the kid in me relishes it!

Thanks, Mark, for the great idea!

Have any SWLing Post readers attempted to build a solar-powered or outdoor ADS-B receiver? Please comment!

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Photo of the new Elad FDM-S3

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Many thanks to SWLing Post contributor, Rafman, who shares the following photos that were originally posted by Alberto (I2PHD) on the Elad email reflector. Alberto noted:

“Here it is…. shown for the first time today at the Montichiari Ham Fest. Price TBD….”

Many thanks, Rafman, for the tip!

We’ll continue to post FDM-S3 updates as they become available. I will also plan to review the FDM-S3 when it hits the market.

Click here to view the Elad website.

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Cornell engineers invent two-way radio on a single chip

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Many thanks to SWLing Post contributor, Tom Ally, who shares the following news via the Cornell Chronicle:

Engineers devise two-way radio on a single chip

Two-way communication requires, of course, both send and receive capabilities. But putting them in the same device requires a filter between the send and receive circuits to provide signal isolation.

Without a significant filter, communication would be impossible.

“Your transmit signal is [10 to the power 14] times stronger than your receive signal,” said Alyosha Molnar, associate professor of electrical and computer engineering (ECE). “That’s 100 trillion times stronger – that’s a really hard problem.”

But researchers in Molnar’s lab have offered up a solution.

Molnar and collaborator Alyssa Apsel, professor of ECE, have devised a method for both transmitting and receiving a radio signal on a single chip, which ultimately could help change the way wireless communication is done.

Their work is described in “A wideband fully integrated software-defined transceiver for FDD and TDD operation,” published online Jan. 27 in the Institute of Electrical and Electronics Engineers’ Journal of Solid-State Circuits. Doctoral student Hazal Yüksel and Dong Yang, Ph.D. ’15, are co-lead authors.

Separating the send and receive bands is difficult enough, but the problem is compounded by the ever-increasing number of bands in the latest devices. From GPS to Bluetooth to Wi-Fi, each band requires a filter to stop the strong transmit signals from drowning out reception.

Molnar and Apsel have come up with an ingenious way to separate the signals. Their idea lies in the transmitter – actually a series of six subtransmitters all hooked into an artificial transmission line. Each sends its signal at regular intervals, and their individually weighted outputs are programmed so that they combine to produce a radio frequency signal in the forward direction, at the antenna port, while canceling out at the receive port.

The programmability of the individual outputs allows this simultaneous summation and cancellation to be tuned across a wide range of frequencies, and to adjust to signal strength at the antenna.

“In one direction, it’s a filter and you basically get this cancellation,” Apsel said. “And in the other direction, it’s an amplifier.”

“You put the antenna at one end and the amplified signal goes out the antenna, and you put the receiver at the other end and that’s where the nulling happens,” Molnar said. “Your receiver sees the antenna through this wire, the transmission line, but it doesn’t see the transmit signal because it’s canceling itself out at that end.” […]

Continue reading on the Cornell Chronicle.

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The W6LVP magnetic loop antenna

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Many thanks to SWLing Post contributor, Troy Riedel, who asks:

Just curious if you or anyone you know have any experience with Magnetic Loops from W6LVP? […]Here’s his eBay page – 458 feedbacks and 100%.

Thank, Troy! I’ve never used the W6LVP loop, but the price–in comparison with other wideband mag loop receive antennas–is very attractive.

W6LVP currently offers two models of loop antennas:

Here’s the product description of the Mag Loop with Power Inserter from the W6LVP website (where orders can also be made–pricing identical to eBay):

The Wellbrook Model ALA1530LN-2 and DX Engineering (Pixel/Inlogis) Model RF PRO-1B magnetic loops are both good amplified receive antennas. However, they are both expensive. Shipping the Wellbrook antenna from the UK to the US adds another $100.

Extensive side-by-side testing of the Wellbrook, DX Engineering, and W6LVP receive loops was compiled using simultaneous WSPR signal-to-noise reception reports on all LF, MF, and HF amateur bands. In addition, extensive laboratory bench tests measuring gain, signal-to-noise ratio, and IMD were also performed. Signal-to-noise ratio is important to pull weak signals out of the noise and IMD is important to reject distortion caused by nearby strong transmitters such as AM broadcast stations. In both test regimens, all three antennas performed very well and without significant difference.

The antenna version listed here includes a power inserter for use with receivers or with transceivers that have a separate receive antenna input. If your rig doesn’t have a receive antenna input, check out my antenna with a transmit/receive switch.

If you live in the shadow of one or more high-power AM broadcast transmitters, contact me about a special version just for you. Please contact me at [email protected].

W6LVP amplified receive-only magnetic loop antenna (boy is that mouthful):

The W6LVP mag loop is a complete receive antenna system delivering top-of-the-line performance to amateur radio operators and SWLs – particularly for those with space and/or budget limitations. It is a great complement to vertical or wire transmit antennas. You have a knob to turn up the power but don’t have one to turn up the received S/N.

Ten foot circumference (approximately 1 meter diameter) loop. Small size yields a natural stealth for HOA challenges. The loop is rigid enough to maintain its shape but flexible for portable transport or attic installation.

Includes a low-noise, broadband amplifier covering 2200 (135 kHz) through 10 meters (30 MHz) with no tuning or adjustment. Perfect match for continuous tuning SDR receivers. Great for contesters to quickly check all bands. Greater coverage is possible at reduced performance.

Light-weight antenna structure fabricated from furniture-grade PVC yields a strong but very light antenna weighing only 2 pounds (not including power inserter or power adapter). Great for both portable/camping as well as fixed installations. Light weight and small size make for lower shipping cost – particularly compared to shipping from the UK.

Directly compatible with a low-cost speaker tripod stand (not included) for portable operation.

Compatible with light-duty rotator (recommended) for fixed operation. Loop can be rotated to null interference by up to 30 dB or enhance desired signals.

Includes low-noise linear AC power adapter to generate clean 12 volts for the loop amplifier. Unlike the DX Engineering antenna which requires 24 VAC, power can be easily supplied by 12 volt batteries during portable operation. Reverse polarity and short circuit protection provided by automatically resettable fuse.

Eham reviews are very positive–so far, 5 stars on all six reviews.

I also discovered this short video of W9OY comparing the W6LVP loop to a full size 80 meter vertical (verticals are much more susceptible to noise than loops):

Click here to view on YouTube.

I am very curious if any SWLing Post readers have ever compared the W6LVP loop to the Wellbrook or Pixel Loop antennas.

I actually own the Pixel Loop and might very well purchase, review and compare the W6LVP loop later this year (if time allows).

If you own the W6LVP loop and/or have compared it with the Pixel or Wellbrook, please comment!

Click here to view W6LVP antennas on eBay.

Click here to view the W6LVP website.

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North American Shortwave DX Contest Results

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Many thanks to SWLing Post contributor, John Cooper, who writes:

Greetings fellow DXers and SWLers.

The North American Shortwave DX Contest, “The Final Countdown,” has come to a close. Participation expectations were high with 50 requests for Contest form packets being received and sent out to prospective contestants.

The actual contest participation in the contest was another matter with only 10 contestants completing out of 13 competing which equaled out to a final 20% participation rate in the contest. 3 contestants dropped out, 1 due to a personal issue, 2 equipment failures due to blizzard conditions in Utah destroying a rooftop antenna, and 1 SW receiver failure.

The question I have is why the lack of actual participation? Was the contest to hard? Or as I have the sinking gut feeling, the Shortwave hobby truly is dying a slow painful death? Thus the contest name “The Final Countdown,” sounds prophetic.

Although Propagation conditions were lousy during the 21 days. of January the contest was held on, there were several days of good DX openings as I participated as an observer, and was able to score high. I would have personally placed in the top 5 if officially entering.

There were 3 great prizes donated by Universal Radio Inc., for the top three finishers, and they were a main sponsor along with NASWA who donated several months of Journal space for the contest packet forms and CIDX who also published the contest forms packet in their excellent monthly electronic newsletter. These are the largest Shortwave Clubs/Associations in North America. Additionally I want to thank Thomas Witherspoon for posting several announcements, reminders, and contest form packets on the SWLing Post, one of my favorite sites for radio information.

The bottom line is those that did participate stated they enjoyed themselves and in some cases the joy of SWLing and DXing were rekindled again after many years of inactivity. That’s a good sign!

73

John P. Cooper
Contest Manager
“The Final Countdown”

Click here to download the The North American Shortwave DX Contest score sheet (PDF).

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eBay find: R.L. Drake SW4A Shortwave Receiver (new old stock!)

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Many thanks to SWLing Post contributors Eric McFadden (WD8RIF) and Randy Moore (KS4L) who share a link to this rare find on eBay: a New Old Stock (NOS) Drake SW4A.

Click here to view on eBay.

The seller provides this short description:

New in original box and packing, R.L. Drake Short Wave Receiver – model SW.4A. With manual. Old stock, never used. Stored in a safe/dry place.

Being sold AS-IS!

The seller doesn’t have a deep history on eBay, but 100% positive feedback.

I fully expect this price to rise way beyond a figure I could appropriate, but I would certainly love to purchase it. I know this: I wouldn’t leave it in the box for long. After carefully checking it and bringing the voltage up slowly, I would put it on the air. What a beautiful receiver.