AmateurRadio.com

The story of the Elser-Mathes Cup may be familiar to many of you. For those of you who are not in the know, you can get all the details from the article by Fred Johnson Elser, W6FB/W70X, in the November 1969 issue of QST. To summarize, the establishment of the Elser-Mathes Cup in 1929 was directly inspired by the leaps and bounds up to that point in radio technology combined with Hiram Percey Maxim’s fascination with the planet Mars. The cup is to be awarded in recognition of the first amateur radio two-way communication between Earth and Mars. I would bet that the cup’s initial establishment was somewhat tongue-in-cheek. Although Fred Johnson Elser’s QST article, on the tail of the success of Apollo 11, gave the cups existence and purpose a good deal more veracity.

How close are we to finally awarding the Elser-Mathes Cup? Lets look at some recent milestones:

Earth-Moon-Earth Bounce
In January 1953, Ross Bateman, W4AO, and Bill Smith, W3GKP successfully bounced at 2M signal off the Moon.

Signal reception of Voyager 1

On March 31, 2006, German radio amateurs successfully received transmissions from Voyager 1 which was already well outside the Solar System (~7,436,464,581 miles away from Earth).

Earth-Venus-Earth Bounce

On March 25, 2009, German radio amateurs achieved another first by bouncing a 2.4 GHz CW signal off of Venus – which at its closest point to Earth is a mere 24,000,000 miles away and 162,000,000 miles at its furthest.

Earth-Mars-Earth Bounce?
Mike Brink, ZR6BRI, has definitely done his homework to show the feasibility of radio amateurs bouncing a signal off of Mars (which has a distance from Earth that varies from 36,000,000 miles to 250,000,000 miles).

However, bouncing a signal off of Mars will not win The Elser-Mathes Cup. The amateur contact must be two-way.

Could the Mars Science Labratory (Curiosity) fulfill the role as the second party of an amateur QSO?

Curisoity does have UHF communication capability. One of Curiosity’s antennas is nicknamed “Big Mouth” and is used to send large data sets to one of three orbiters around Mars: the Mars Reconnaissance Orbiter (which will probably do most of the work), Mars Odyssey Orbiter, or the European Space Agency’s Mars Express orbiter. The orbiter then relays the data via the Deep Space Network (DSN) back on Earth using X-Band.

“Big Ear” is Curiosity’s high-gain, directional X-Band antenna that can be used to communicate directly with the DSN on Earth. “Little Ear” is an omni-directional, X-Band antenna that is designed to be used primarily to receive low data rate transmissions from the DSN.

Putting aside the fact that Curiosity’s X-Band frequencies are outside the authorized US amateur frequency allocation and given the German amateurs success with Voyager and Venus – amateur communication with Curiosity looks possible (but probably not with my Arrow II antenna).

So, if it is possible for Joe Amateur (along with a heap load of expensive gear) to have a QSO with Curiosity – what would prevent the actual hacking of Curiosity?

Damon Poeter’s August 9th article “How to Hack NASA’s Curiosity Mars Rover” takes a look at this proposition. Mr. Poeter all but dismisses the possibility of a private citizen contacting Curoisty and instead focuses at actually hacking through NASA’s control system. Then on August 10th, Mr. Poeter submits “Unknown Actor Soliciting Partners for Mars Rover Hack”. Now, possibily, there are individuals who are actually trying to hack their way through NASA by soliciting help in determining what frequencies are used to communicate with the orbiters above Mars.

Here on an IT secuirty forum, a question is asked concerning the secuirty of Curiosity. One of the responses is from a former controller who is somewhat familiar with NASA’s general communications protocal with spacecraft and identifies the transmission of bogus communications to Curiosity as a possibility. Although the post’s author identifies that the capability to conduct such an act would have to be another country (…. and everyone loves pointing the finger at China).

It is easy to forget that radio amateurs have been intercepting space communications for sometime, with Sputnik’s signal on 20.007 MHz and Apollo 11 communications being primary examples.

All this being said, I think The Elser-Mathes Cup will continue to gather dust for a bit longer.

Episode 50: A milestone!

Announcements:

• Russ talks about his California trip: attending the Large Installation Systems Administration conference (LISA).
• The 50th episode is a milestone – Richard explains why. See also The Internet Archive.
• Lord Drachenblut reminds us of the upcoming Indiana LinuxFest in Indianapolis, Indiana. If you’d like to register, use the promotional code LHSPODCAST50 (all capital letters) and you’ll get a $15.00 discount on the ticket.
• Music in this episode is from 20lb Sounds, fronted by Dan Lynch of Linux Outlaws fame.

Topics:

• Scott, AD7MI, posted an article on his blog about moving to an all-Linux ham shack. Richard and Russ discuss the article, including Shackbox Linux, Ham Radio Deluxe, CQRLog, and more. Ultimately, Fldigi and CQRLog resulted in “100% Linux Nirvana”.
• Scott also asks what we think would be the ideal Linux-based ham shack. Russ describes his shack, which he thinks IS ideal. Our hosts then discuss various soundcard interfaces:
  • RigBlaster
  • MicroHAM
  • Rascal
• Most sound cards work fine, and Russ recommends the SoundBlaster series over all, but suggests staying away from the SoundBlaster Audigy SE (model CA0106) sound cards as they don’t seem to work well (or at all) under Linux.
• Richard likes his Yaesu FT-897D. Most modern rigs allow a fixed-audio level connection to the computer sound card, as well as computer rig control. Russ has the Kenwood TS-570D, and it, too, is well-supported in the Linux ham libraries.
• Russ and Richard discuss the fact that most hams don’t log VHF/UHF contacts, other than in contests or toward an award.
• The FCC, created by the Communications Act of 1934, included the requirement to maintain a log book in the rules. Sometime between 1983 and 1986, this requirement was dropped as the FCC determined that the information was of little use to them. (If someone can point us to a reference that identifies when the exact rule change occurred, please let us know. I was unable to find the specific change online. -Ed.)

Feedback:

• Leif, KC8RWR, writes that Internet over EME (earth-moon-earth) isn’t likely to work due to the high latency involved. (This may be in reference to a comment in Episode 48.) NASA and DARPA are involved in a Deep-Space Internet project.
• Leif also asks “Isn’t Morse code dead?” and wasn’t it replaced by “Gerke Code”? Our hosts discuss.
• Craig, KB5UEJ, writes that he thinks Russ’ audio is louder and muddier than Richard’s in episodes 46 and 47. Russ agrees that the audio on a few of the recent episodes did suffer, but should be much improved now.
• Grant, KC9SJQ, comments that he doesn’t see a link to Russ’ screencast about SSL anywhere. Yes, it somehow disappeared, but Russ is working on it. He’ll either find the file or redo it.
• William, KB9TMP, sends his comments about Episode 48 where we discuss KE9V’s article that questioned the relevance of amateur radio.
• Craig, KB5UEJ, commenting about WSPR, says that you can run less than 5W on an FT-897 by reducing the audio drive from the computer to the radio. Richard points out that the reduction is often not uniform across the audio freqeuncies used, so some intelligibility may be lost. He had that problem with packet, but he’ll try it with WSPR.
• Matt wants to know the artist and title of a song in Episode 48. The song was “Endline (Choose Nothing)” by I Am Not Lefthanded from the album “Yes Means No”. Check out the show notes for Episode 48 for a link to the song.

Donations:

• Scott, AD7MI, sent a donation just before we recorded! Thanks, Scott.
• If you’d like to help the podcast, please consider making a donation. It’s easy! Just a click on the Donate button on the web site.

Contact Info:

• Contact Richard at [email protected], Russ at [email protected], or both at the same time at [email protected].
• Listen to the live stream every other Tuesday at 8:00pm Central time. Check the LHS web site for dates.
• Leave us a voice mail at 888-455-0305 or 417-200-4811, or record an introduction to the podcast.
• Sign up for the LHS mailing list.
• Sign up for the MAGNetcon mailing list.
• Thanks to Dave from Gamma Leonis for the theme music.

Music:

• Redemption Song performed by 20lb Sounds.
• Jimmy Carter, also by 20lb Sounds.

Hello, podcast listeners! It has been an extra week that you've had to wait for our landmark episode 50 to be released. I (Russ)  had planned to do an episode from his hotel room in San Jose. Unfortunately, the network there was so bad it was impossible to record so everything was pushed back.

In this episode, we talk about life, love and amateur radio. OK, not really. But we touch on a number of interesting topics including the necessity of logging in amateur radio, theoretical nonsense like Internet via Moonbounce and, thanks to a couple of missives from AD7MI, we wax philosophical on our ideal ham shacks--computers running Linux included of course.

Thank you for being a listener of our show. If you're new: Welcome! Please tell everyone you know where they can find us. And keep fighting the good fight.

73 de The LHS Guys

This evening I managed to hear signals bounced off the moon using an FT-817 and an antenna made from a stick and a few bits of wire.

I took the battery out of the clock / weather station to silence its interference and went down to the bottom of the garden with the home made antenna and the FT-817. I couldn’t see the moon this evening as it was cloudy – in fact, attempting to drizzle – but I pointed the beam in the same general direction as last time, turned it vertical to minimize the QRN and started tuning around 432.045MHz. After a minute or so I heard some weak CW.

If I had to give a signal report it would have been 319, the signal was about equal to the noise. Sometimes it would pop up a few dB above the noise for a second or two, and I heard the call KP4AO (though not all in one go), reports being sent, R, 73 and BK, but I couldn’t make out any other calls.

I had the computer interface plugged in to the FT-817 so I brought down the Samsung NC10 netbook which I have been using for my Echolink node and tried to make recordings of what I heard using Sound Recorder in order to listen to them again and even put some samples here. But for some reason when I played them back on my shack PC all I could hear was noise – the CW had all but disappeared. What a disappointment, to have no record of this rare event.

Then, on a sudden stroke of inspiration, I changed my computer sound card settings so that I was using the Realtek internal sound card – normally used for HF digital modes – to play back the audio in place of the cheap USB “dongle” I normally use for computer sound. What a difference! Instead of just hiss with a barely detectable hint that a CW signal might have been there, I now heard the KP4AO signal via the moon just as I heard it live off-air. I have converted a couple of samples to MP3 format without much loss of fidelity so you can hear for yourself what I heard:

• Here is a short sound clip from KP4AO recorded at 1937 UTC
• And here is a slightly longer one recorded around 1945 UTC

The CW certainly is weak but you can pick out letters now and again. If you manage to pick any calls out of those samples then you have better ears than me (which is certainly possible.)

An interesting evening’s experiment. Not just because I heard signals bounced off the moon for the first time ever but also for the unexpected demonstration of how weak signals get lost when you use a cheap sound card. I had been planning on using one of those USB dongles to make my own SignalLink interface. I think it’s back to the drawing board on that one.