Tag Archives: Ham Radio

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

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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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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Video: TX Factor Episode 10

Maritime emergency ham radio recording

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maritime-exchange

An SWLing Post reader recently sent me the following YouTube video–a recording Hanz (W1JSB) made on the 20 meter ham band several years ago. Here’s his description from YouTube:

Several years ago I was tuning around the 20 meter amateur radio band and heard this lively, engaging, and impressive exchange on the maritime mobile frequency, 14.300 MHz.

Vessel ‘Elusive’ at sea in the North Pacific was being followed by another ship. The occupants felt threatened that it might be a pirate, so they called for help on the HAM
radio.

Volunteer radio operators around the country worked together to communicate and relay messages with the Coast Guard in California. They also came up with some brilliant ideas to stay safe and get direct help as soon as possible.

The following is a recording from my location in New Hampshire.

– Hanz W1JSB

Many of us who’ve been long-time SWLs and ham radio operators have heard interesting broadcasts and exchanges on the HF bands. Please feel free to comment with your notable listening moments!

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P5/3Z9DX: Successful ham radio activation of North Korea

The annual “Santa Net” on 3916 kHz

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Santa-Radio-Vintage

If you have a shortwave radio with SSB mode, you too can listen to the Santa Net on 3916 kHz LSB every night until Christmas starting at 01:30 UTC (7:30 PM CST). Of course, if you’re an amateur radio operator, you can talk to Santa as well!

(Source: Southgate ARC)

Santa Net 3916 kHz

Larry Shaunce WD0AKX provides a reminder that at this time of year kids can talk to Santa at the North Pole via amateur radio

Every year before Christmas, there is the Santa net on 3916 kHz on the 75 meter ham radio phone band 7:30 CST or 0130 UT. Round up your kids, grand kids, or neighbor’s kids and let them talk to Santa at the North Pole.

Watch Talk To Santa By Ham Radio – It’s The Santa Net On 3916 kHz!

https://www.youtube.com/watch?time_continue=263&v=KfFk430lxXU

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Scott’s Elecraft KX3 Go-Box

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Many thanks to Scott (AK5SD) who shares the following photos and bill of materials for his custom Elecraft KX3 go-box:

Bill of materials

The panel was custom laser cut by Front Panel Express. I have the CAD
file and I’m willing to share it with anyone who wants to reproduce my effort.

Amazon.com
Case B&W Type 1000 Outdoor Case with SI Foam
You won’t use the foam, so you can buy the version without it if you can find it cheaper.

Battery Anker Astro Pro2 20000mAh Multi-Voltage (5V 12V 16V 19V)
Portable Charger External Battery Power Bank
Avoid look alike batteries and the next generation model from Anker. The newer Anker
battery is only capable of delivering 1.5A from the 12V supply. Two look alike batteries
I tried did not have the auto-off feature that the Anker does.

Vetco.net
ACC2 and I/Q Jacks 2 x 2.5mm Stereo Jack Panel Mount (PH-666J-B)
Phone, Key, and ACC1 3 x 3.5mm Stereo Jack Panel Mount (High Quality) (PH-504KB)
Mic Jack 1 x 3.5mm 4 Conductor Jack Panel Mount (PH-70-088B)
12V IN and CHG IN 2 x 2.1mm DC Power Panel Mount Jack (PH-2112)
12V OUT 1 x 2.5mm DC Power Panel Mount Jack (PH-2512)

You also need plugs and wire for interconnects. I bought some 2.5mm (CES-11-5502)
and 3.5mm (PH-44-468 for stereo, PH-44-470 for 4-conductor) audio cables with right
angle plugs and just cut them to use for the signal lines going to the KX3. I did the same
thing for the 2.5mm (PH-TC250) and 2.1mm (PH-TC210) power cables. A couple of
caveats are in order. The Phone, Key, and ACC1 interconnects require low profile
right angle connectors. The cables I listed above won’t work. Vetco part number
VUPN10338 will work. The power cables I’ve listed above use 24 gauge wire. This
is a little light, but the runs are small so I think it is OK. You can use higher gauge
cables if you can find a source.

USBfirewire.com
USB OUT USB 2.0 Right Angle Extension Cable (RR-AAR04P-20G)

Digikey.com
L Brackets 8 x Bracket Rt Ang Mount 4-40 Steel (612K-ND)
These L brackets are used to mount the KX3 to the panel and the panel to the case.
For mounting the KX3, I use a little piece of stick on felt on the bracket to protect the
KX3’s cabinet from damage. Replace the KX3’s screws with #4-40 Thread Size, 1/4”
Length Steel Pan Head Machine Screw, Black Oxide Finish (see below). For the panel
mounting, use #6-32 Thread Size, 3/16” Length self tapping sheet metal screw. You
may need to cut the tip off in order to not puncture the outside of the case.

RG316 BNC Male Angle to BNC Female SM Bulkhead Coaxial RF Pigtail Cable (6”)
This is not the original interconnect I used for connecting the KX3’s antenna output to
the panel. However, I think it is a better option for new designs. The caveat is that you
will need to verify the hole in the panel matches the bulkhead connector on this cable.
There will be a little loop in the cable when you are done, but that is fine.

Micrfasteners.com
Screws for Sound Card 2 x FMSP2510 – M 2.5 x .45 x 10mm
Screws for KX3 Bracket Mount 4 x MSPPK0404 – 4-40 x 1/4
Screws for Countersunk Panel Holes 8 x FMPPK0403 – 4-40 x 3/16
Screws for USB Connector *** 2 x FMPPK0406 – 4-40 x 3/8

I’m pretty sure these are the right length for the USB connector. I am doing it from memory.

Amazon.com or eBay.com
Soundmatters foxL DASH A Wireless Bluetooth Soundbar (OPTIONAL)

Sonoma Wire Works GJ2USB GuitarJack 2 USB Portable Audio Interface (OPTIONAL)
(Make sure you get the USB model, not the 30-pin model.)

This is optional if you want a built-in sound card interface for a waterfall display using iSDR. Make sure to eliminate the holes in the upper left corner of the panel if you are not installing. You will also need 2.5mm x 10mm screws to mount this to the bottom of the panel (see below).

bhi Compact In-Line Noise Eliminating Module (OPTIONAL)

In my opinion, the KX3’s noise reduction is totally ineffective for SSB communications. This external noise reducing DSP is one solution, albeit an expensive one, to that problem. It is only for SSB, not CW or digital modes. It is also available from GAP Antenna Products.

Scott: you have done a beautiful job here and have spared no expense to make a wonderfully-engineered and rugged go-box. No doubt, you’re ready to take your KX3 to the field and enjoy world-class performance on a moment’s notice.

Though I’ve never used them personally, I’ve noticed others who have taken advantage of the Front Panel Express engraving service–certainly makes for a polished and professional front panel.

Again, many thanks for not only sharing your photos, but also your bill of materials which will make it much easier for others to draw inspiration from your design!

Speaking of designs, when I looked up Scott on QRZ.com, I noticed that he also sports a QSL card (above) designed by my good friend, Jeff Murray (K1NSS). Obviously, Scott is a man with good taste!

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