Category Archives: Ham Radio

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!

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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!

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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…

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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

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“A DXer’s Christmas”

My buddy, Skip Arey (N2EI), shared the following poem on his Facebook page and has kindly allowed me to post it here!

Skip writes:

“I originally published this in the NASWA “FRENDX” club journal in 1987 and later in the December 1992 issue of Monitoring Times magazine. Many thanks to Steven K. Roberts for recovering the text for me as it never stuck to my hard drive. Enjoy.”

A DXer’s Christmas

(With apologies to Clement Clarke Moore)

‘Twas the night before Christmas,
and all through the house
The “Harmonics” were sleeping,
and so was the spouse;
The antennas were hung
from the chimney with care
in hopes that some signals
would come through the air;
The receivers were nestled
all neat in a row, With filters and tuners
all ready to go;
With a strong cup of coffee,
sitting at my right hand,
I had just settled in to some radio band,
When out of my headphones
there arose such a clatter,
I sprang from my desk
to see what was the matter.
Away to the window
I flew like a flash,
To determine the cause of this odd static crash.
The Moon on the breast
of the new -fallen snow,
Gave my antenna wires an unusual glow;
When what to my wondering
eyes should appear,
But a weird little sleigh
and eight tiny reindeer.
With a strange little driver,
who looked like a “Hippie,”
I though for a moment
my brain had gone dippy.
More rapid than eagles
his coursers they came,
And he wheezed, and he cursed, as he called them by name: “Now Ten-Tec! Now Icom!
Now Yaesu and Philips!
On Grundig! On Sony!
On Kenwood and Collins!
Watch out for the porch!
Watch out for the wall!
Stay out of the way,
and don’t let me fall!”
As dry leaves that before
the wild hurricane ride,
When they met with an obstacle,
they kicked it aside.
So up to the house -top
the coursers they flew,
And got tangled in wire;
the old Hippie did too.
And then, in a twinkling
I heard through the ceiling, a great deal of cursing,
and swearing, and squealing.
As I shook my head,
and hollered out “Stop!”
Down the chimney the bearded one
fell with a plop.
He was dressed all in denim,
from his headphones to tail,
His clothes smelled like sweatsocks,
and his breath like cheap ale;
The stump of a stogie
he held tight in his teeth.
And the rancid smoke circled
his head like a wreath;
He had a fat face
and a great big beer -belly,
That shook when he burped,
like a bowlful of jelly.
He spoke not a word
but went straight to his work,
Opened up my receiver,
and tuned with a jerk.
Then sticking a finger
inside of his nose,
And giving a burp,
up the chimney he rose. The receiver it squealed,
and gave out a whistle,
And the stations I heard that night,
would fill an epistle.
And I heard him exclaim, ere he drove out of sight,
“Happy DX, Old Man,
next time, leave on a light!”

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Guest Post: Remembering our Elmers

Photo: Mario Filippi (N2HUN)

Many thanks to SWLing Post contributor, Mario Filippi (N2HUN), for the following guest post:


‘Tis the Season to be Jolly and to Remember Our Elmers

by Mario Filippi (N2HUN)

At this time of year when we gather with friends, family, coworkers and acquaintances to share the bonhomie and joys of the holidays let us fondly remember those who brought us into this hobby, our dear Elmers, those individuals who’ve given of their time teaching us the basics of ham radio, answered our endless questions, inspired us by their shacks, guided us through the difficulties of radio theory and good operating practices and proctored us through our first examinations. If it weren’t for these selfless individuals, who followed a time-honored tradition of mentoring budding hams, the hobby would not continue on and most of us might have taken other paths and missed out on a life-long, very rewarding hobby.

To start the ball of reminiscences rolling, take a seat with me in the time machine of memories and go back to the early 1970’s, to the suburbs of White Plains, NY, the home of my Elmer, may he rest in peace, George Buchanan, WB2FVX (SK).

George held Novice classes once a week in the basement of his home where he tutored a gaggle of ham wannabes consisting of grammar school kids to those of advanced age, some of whom were old railroad telegraphers schooled in the use of sounders. We’d have an hour of lecture, followed by code practice, then the class would end with general socializing amongst the students as to what transpired along with our future plans for our “shacks.”

You know, George did not quit his day job to train us through our larval stages of the hobby; as a matter of fact he commuted to the city every day and still found the time once a week to start his 7:00 PM class for his eager students, and always had energy after a long day’s work to stand in front of his chalkboard and work out the numerous electronic calculations (OHM’s Law, parallel and series circuits of resistors and capacitors, antenna resonance and impedance ) and list important regulations that would be included in our FCC Novice exams. At the conclusion of the three month course, George sat through our Novice exams and mailed them off to the FCC Office in Gettysburg, PA. Back then it took a few months before you’d get your license and hold in your hand the fruits of your (and your Elmer’s) labors.

George has been a silent key for decades now, and he frequently comes to mind, especially during the holiday season, when thoughts of Christmases past and all of the pleasant memories of almost forty years in the hobby occupy my mind. Indeed, George and all the other Elmers out there, living and deceased, have bestowed upon us one of the greatest gifts of all – Amateur Radio.

Think back on your Elmer and do so with fondness and when the opportunity presents itself, take an inexperienced ham under your wing, guide them, inspire them, show them your shack, answer their questions, help them pick out a rig or accessory, have a QSO with them, help them with troubleshooting, accompany them to a hamfest, share the joys with them when they purchase a piece of equipment, and most of all, be there for them.

Merry Christmas and Happy New Year to all!


Thank you, Mario, for sharing these special memories with us! George was an ideal Elmer indeed–he had the ability to share his enthusiasm and passion with others and helped them obtain their license during a time when study materials were not so readily available (and the test was much more challenging!).

Thank you, Mario!

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1940 Pearl Harbor QSL card

pearl-harbor-qsl

Many thanks to SWLing Post contributor, Bill Patalon, who shares the following QSL card via Twitter:

Thank you, Bill!

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