Category Archives: Ham Radio

World Amateur Radio Day April 18th

This announcement for World Amateur Radio Day was posted on the IARU website along with links for clubs (or individuals) to download flyers and posters to promote the event.

World Amateur Radio Day

Every April 18, radio amateurs worldwide take to the airwaves in celebration of World Amateur Radio Day. It was on that day in 1925 that the International Amateur Radio Union was formed in Paris.

Amateur Radio experimenters were the first to discover that the short wave spectrum — far from being a wasteland — could support worldwide propagation. In the rush to use these shorter wavelengths, Amateur Radio was “in grave danger of being pushed aside,” the IARU’s history has noted. Amateur Radio pioneers met in Paris in 1925 and created the IARU to support Amateur Radio worldwide.

Just two years later, at the International Radiotelegraph Conference, Amateur Radio gained the allocations still recognized today — 160, 80, 40, 20, and 10 meters. Since its founding, the IARU has worked tirelessly to defend and expand the frequency allocations for Amateur Radio. Thanks to the support of enlightened administrations in every part of the globe, radio amateurs are now able to experiment and communicate in frequency bands strategically located throughout the radio spectrum. From the 25 countries that formed the IARU in 1925, the IARU has grown to include 160 member-societies in three regions. IARU Region 1 includes Europe, Africa, the Middle East, and Northern Asia. Region 2 covers the Americas, and Region 3 is comprised of Australia, New Zealand, the Pacific island nations, and most of Asia. The International Telecommunication Union (ITU) has recognized the IARU as representing the interests of Amateur Radio.

Today, Amateur Radio is more popular than ever, with over 3,000,000 licensed operators!

The full article and a list of several amateur-radio related activities may be found here.

Robert Gulley, AK3Q, is the author of this post and a regular contributor to the SWLing Post. Robert also blogs at All Things Radio.

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LRN Precision introduces two new QRP transceivers: the LD-11 and MTR5B

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LNR-MountainTopper-LD11-Announcement

LNR Precision announced two new QRP transceivers this weekend: the MTR5B and LD-11. Below, you can find details I pulled from LNR’s press release and website for both units:

LNR-Precision-LD-11

The LD-11

The LD-11 is a new 11-band QRP transceiver based on the LNR’s LD-5 transceiver. The LD-11 covers from the 6 meter band down to the 160 meter band. A new feature on this model is a built-in panadapter. AM/FM/SSB and CW modes are all included.

Here is the description from LNR’s website:

The new LD-11 is Digital Direct Conversion, SDR type, build-in CPU (SM32a) DSP radio in which RF signals are directly converted to a digital data via differential and balanced A/D converters. This enables direct sampling with extremely low phase and floor noise.

The DSP is unique and features two independent channels. It also employs a unique differential algorithm within the software which is applied for IQ processing of the channels with phase suppression of the unwanted side-band channel.

The balanced ADC and DAC gives additional noise floor reduction and the receiver can handle interfering signals that are 100 dB stronger than the desired signal at a frequency separation of 10 kHz, and is about 130 dB stronger at 50 kHz separation. As the receiver and transmitter are using the same DSP channel, there is no gap between the receiver performance and the transmitter performance. Thus, there is a clean neighborhood on the bands. At the development stage, our intentions were motivated by the TX side-band noise of existing SDR manufacturers, so our aim was to fully equalize our transmitter to have noise performance that is compatible with the best modern receivers, or even better. After a arduous year of development , we think we achieved it!

This 11+ band radio is based on the LD-5, which has proven to be one of the most exciting QRP transceivers introduced in the last few years. Quite frankly, the performance rivals high end units offered by other manufactures at a much lower price point. Our motto is that we make QRP transceivers that you will want to take out in the field (without fear of breaking the bank).

Price is $774.99 US

LNR-Precision-LD-11-L-Side LNR-Precision-LD-11-R-Side

Note: Larry Draughn (AE4LD), President of LNR Precision, will be issuing an LD-11 transceiver to me on loan for review. I’m looking forward to putting it on the air.

What fascinates me about the LD-11 is that, although it’s designed as a ham band-only transceiver, the band edges of the 30 meter ham band can be expanded to include the full 31 meter broadcast band. There are, perhaps, other ham bands that can include nearby broadcast bands as well. I will plan to experiment with the band edges.

The MTR5B

The new MTR5B 5-Band Mountain Topper is a fully-assembled 5-band CW transceiver KD1JV designs “Steve Weber” kit. The following are specifications/features from the LNR website:

40M, 30M, 20M, 17M, 15M
Size: 4.337″L x 3.153″W x 1.008″T
Weight: approx 6.4 OZ.

Features:

Switch selected 40/30/20/17/15 meter bands (no band modules to lose or change out)
Wide operating voltage range, 6 to 12 volts 15 ma Rx current at 12V supply
Efficient transmitter. Low current with 4W output
LCD display
Push button or Optional rotary tuning
24 hour clock built in, with battery back up
Three 63 character programmable message memories
Message beacon mode with adjustable pause time

MTR5B-1

Price is $379.99 US

Steve Weber’s QRP transceivers are amazing and incredibly portable. His MTR-3B trail radio has received very favorable reviews over the past year; I expect the same from the new MTR-5B.

If you were lucky enough to grab a first production unit of either of these radios, I would love to post your overview/review! I’m looking forward to checking out the LD-11 soon. I’ll post updates with the tag: LD-11

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Guest Post: Building a magnetic loop antenna & broadband amplifier for your SDR

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Many thanks to SWLing Post contributor, Dave Gahimer (K9ZCE) for the following guest post:

Small Magnetic Loop Antenna with Broadband Amplifier for SDR Reception

by Dave Gahimer (K9ZCE)

Those with limited space, or antenna restrictions, might find a small 1 meter loop antenna a solution.

My son lives in an apartment. One Loop leaning against a wall gives him acceptable reception with the SDRPlay RSP on the ground floor–2nd or 3rd level flats should have very good reception.

Ten meters off the ground outside should give reception equal to any SWL antenna. We all with SDRs fight the image problem. Normal resonate ham band antennas show too strong reception of unwanted bands/stations. Did I mention noise? Loops are well known for –6 db noise reduction.

Then there is the possibility of SDR chip damage from your 1.5 KW station! In researching Loops we came across LZ1AQ. A Brilliant design /engineer (http://www.lz1aq.signacor.com/). Deep reading sometimes, but a great understanding of what makes a good receiving loop antenna.

Those who chase DX know that sometimes fading is caused by the signals’ polarization changing in the Ionosphere. Having both vertical and horizontal loops, and the ability to combine both signals diminishes this fading problem. Being able to filter the powerful, commercial FM transmitters diminishes image problems. Clipping strong signals at the antenna from very near powerful antennas/transmitters could save the SDR receiver from damage.

The LZ1AQ broad band Amp solves all these problems. http://active-antenna.eu/amplifier-kit/.

My son Ted and I built three, one meter loops from soft ½ inch copper plumbing tubing. One for his apartment, two for my crossed loops antenna. We weather proofed the Copper from corrosion by coating with outdoor clear spar varnish. We shaped the circle by drawing the tubing around a round glass top patio table.

The soft copper loop in held by white PCV plastic plumbing pipe. 1” or 1.25 inch schedule 40. Be careful to check that the PVC is schedule 40, thick wall. The thin wall pipe is not strong in the wind and will crack when you try to drill it.

Drill up to a 3/8 hole for the ½” copper tube to go through, then file out to fit. Here are some photos (click to enlarge):

Check out these links (all courtesy of LZ1AQ) to acquaint yourself with the loop construction and amplifier installation:

http://active-antenna.eu/tech-docs/2_ActiveAA_Mount_20.pdf

http://active-antenna.eu/tech-docs/1_ActiveAA_DandS_20.pdf

http://active-antenna.eu/tech-docs/3_ActiveAA_Antena_11.pdf

Many SDR receiver owners have seen improved noise and Image reduction by placing the plastic cased SDR unit on a small shielded/ grounded case.

The Amp needs 12VDC from in the shack. The Amp has two relays that you can switch, from in the shack, to select Vertical or Horizontal loops, or a dipole. The loop amp connects back to the shack via a shielded Cat 5 cable, Make sure you get shielded CAT 5 to reduce noise pickup. Make sure you provide an adequate good Ground below the antenna, less noise pickup and lightening protection.

Have fun!
Dave, K9ZCE
Retired from EE Dept @ Rose-Hulman Institute of Technology
Terre Haute, Indiana

Thank you so much, Dave!

Readers: yesterday I saw Dave’s loop antenna photos on the SDRplay RSP Facebook page. I was fascinated by his horizontally/vertically oriented loops and asked if he would write up a short guest post. He kindly obliged in a matter of hours!

If you have an antenna project you’d like to share, please contact me. So many SWLs and ham radio operators live in areas with restrictions and pervasive RFI–projects like Dave’s can revive one’s radio life!

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Heard Island DXpedition (VK0EK) live via WBCQ tonight

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(Source: ARRL)

[…]At 0000 UTC on March 23 (the evening of Tuesday, March 22, in US time zones), Tom Medlin, W5KUB, host of the weekly “Amateur Radio Roundtable” video webcast and radio program, hopes to make ham radio media history by interviewing the DXpedition team live on his webcast. Audio will be simulcast on international shortwave broadcaster WBCQ on 5130 kHz.

Heard Island is an Australian protectorate, part of a subantarctic island group(Heard Island and McDonald Islands) in the southwest Indian Ocean, some 4000 kilometers (approximately 2480 miles) southwest of Western Australia and 1000 kilometers (approximately 620 miles) north of Antarctica.

I will certainly be listening to WBCQ tonight and, hopefully, recording the show for the SRAA.

For updates about the Heard Island DXpedition, check out their website (and admire Jeff Murray’s excellent official DXpedition artwork while you’re at it!).

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Listening to the International Space Station (ARISS) with a Yaesu VX-3

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Yesterday, my buddy Eric (WD8RIF) sent the following message:

“Take your girls outside with an HT and listen to the ARISS pass in just about 10 minutes. The downlink freq is 145.800.”

Though I was in the middle of another project, I took Eric’s advice: I grabbed my Yaesu VX-3, corralled my daughters and ran outside. Eric’s message was already eight minutes old when I read it, so I only had about two minutes to get ready.

My Everyday Carry (EDC) pack, loaded with all of the essentials.

Fortunately, I always have a Yaesu VX-3R loaded with fresh batteries in my EDC pack (above).

Official NASA portrait of British astronaut Timothy Peake. Photo Date: August 28, 2013. Location: Building 8, Room 183 - Photo Studio. Photographer: Robert Markowitz

Official NASA portrait of British astronaut Timothy Peake. Photographer: Robert Markowitz

With the VX-3 tuned to 145.8 MHz, we waited as the ISS made its way above the horizon. The downlink audio of astronaut Tim Peake (KG5BVI) communicating with Walter Jackson Elementary in Decatur, Alabama, started to punch through the static after a minute or two. We listened the entire time we had line-of-sight to the ISS–about five minutes or so. We were pretty deep in a valley at that point, so I’m pleased we were able to catch even that much of a pass.

Of course, we could only hear one side of the conversation: the downlink from the International Space Station.

It was a memorable event for my girls who have seen ISS passes at night, but had never heard live audio from an astronaut before.

Here’s a short video of two of the exchanges we heard:

(Click here to view on YouTube.)

Eric pointed me to the ARISS “Upcoming Contacts” (http://www.ariss.org/upcoming-contacts.html) page where future ARISS QSOs are listed. Evidently, this particular ARISS QSO was the third Eric had monitored in two weeks.

Pretty much any receiver that can tune to 145.80 MHz FM–or a VHF scanner–can hear the ARISS downlink as long as the ISS is passing overhead during the transmission. Of course, if you have a high-gain antenna that can track the ISS as it moves across the sky, you’ll get even better results than I did with my basic rubber duck antenna.

My advice? If you want to impress a child (or your inner child–!) find a little time to listen to a future ARISS QSO!

Indeed, the next step for me is to see if I can propose an ARISS QSO for our school group!

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Mark’s Icom IC-7100 go kit

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Click to enlarge

Many thanks to SWLing Post reader, Mark Hirst, who writes:

Thomas,

I have been very impressed by the shacks featured on SWLing !

I don’t really have the room to accommodate such large collections, or to dedicate a special area to just radio.

I tend to perch a radio on a spare surface in the front bedroom, and then cycle through my small collection on a weekly or bi-weekly basis, returning the previous radio to storage to await its turn in a month’s time.

Since newer houses and gardens are typically quite small in the UK, I’ve always been thinking in terms of radio on safari, so with the weather starting to improve, I present to you my ‘shack’ consisting of a recently acquired IC-7100 inside a fortuitously sized toolbox. The radio runs in the bedroom like this too, usually connected to a Wellbrook loop when not transmitting.

The picture [above is of the] head unit in stowed configuration, as the lid of the box doesn’t quite clear the unit when sitting on the base. The space on top of the radio is then filled by the SOTA Beams antenna bag and other sundries. The battery travels separately in the backpack.

My plan was to never have to connect/disconnect the ethernet style cable between the two halves, looks like the plan worked !

You can see it in action here:

This is a brilliant kit, Mark–a great way to escape urban radio interference! The Icom IC-7100 is uniquely qualified for the deep case, too, since the control head can sit on top of the body while in use. The angle of operation is also ideal. Very cool–thanks for sharing!

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Stuart Sizer: Heathkit designer, dad, and “bon vivant”

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Two weeks ago, through a radio preservation group, I met the son of Heathkit product designer of the 1950s-70s, Stu Sizer––”stylist, artist, maker of models, bon vivant.” His son described the discovery of a few vintage Heathkit brochures, photos, and illustrations his father kept in his family’s basement shop, many of which had been scanned at some point.

Stu Sizer––”stylist, artist, maker of models, bon vivant”––was tasked with crafting Heathkit’s user-friendly and attractive exterior designs. For many years Sizer was Heathkit’s only product designer, and was therefore often busy. “He was a great dad,” his son told me, “but he spent a lot of time in the basement proof-building kits.” He adds wryly, “Let that be a lesson to the hams of this world.”

Sizer’s son kindly shared with us the following scans and photos of his dad’s work, many of which are original drawings; the series concludes with some clippings featuring Sizer.