AmateurRadio.com

A new version of the Opera software has just been released which can output the bit code of a beacon signal so it can be programmed into a microcontroller such as a PIC or a Parallax Propeller chip. (You can find the download via the Links page of the Opera Yahoo group.)

I modified Eldon Brown WA0UWH’s QRSS program code to send the bit code generated by the Opera software and it was received by my K3 on 30m and successfully decoded. Not bad for 5 minutes’ work! You can download the code here.

Just as Eldon did I will have to build an amplifier to raise the output of the Propeller from a couple of milliwatts to something with a better chance of being received. Before it is worth doing that people will have to start using the Opera mode on the HF bands because with my antenna restrictions I have no hope of receiving or radiating a signal on LF or VLF. But I am quite excited at the possibility of building simple standalone beacon transmitters for this new weak signal mode which is much easier to generate than WSPR or QRSS.

Stop press: Just decoded G0NBD on 10.135MHz +1500Hz for my first real over-the-air Opera spot. And it appears my first transmission (using the PC software and my K3 at 5W) has been received by OM5NA at -21dB. This is fun!

Julian Moss, G4ILO, is a regular contributor to AmateurRadio.com and writes from Cumbria, England. Contact him at [email protected].

After getting the Sirio 10m antenna on the car last autumn, I’ve been switching the FT8900 over from the VHF/UHF aerial to use 10m, particularly at weekends as I’ve been driving around. On the FT8900 I’m restricted to FM of course, so I’d been thinking about getting the Anytone AT-5555 in the car to give me SSB capability.

It was just a case of getting the bits together to do it, which in reality was just sorting out the power. I assumed that fixing would be easy, but actually as ever, there’s less room in small cars than you think. And the Anytone is actually quite a big rig! In the end, I managed to fix it securely to the left hand side of the centre console. It seems quite easy to operate and doesn’t impede driving.

On a test drive across to the next village, I listened and heard some activity; UA9XL and an EA8 on SSB as well as a UN9 down on CW. SWR of the antenna seems fine in the lower portion of the band.

Hopefully I shall be able to make some contacts in the coming weeks. 12W or so is quite low power for SSB but I am sure something will be possible and in any case, it’s always interesting to listen.

One thing I have already tried – whilst parked – is tuning the rig to 28.120 to receive PSK and decoding it on my iPhone with the ‘Multimode’ application. In theory, a QSO may be possible by ‘miking’ the output of the iPhone to the rig.

I’m looking forward to seeing what can be done

Tim Kirby, G4VXE, is a regular contributor to AmateurRadio.com and writes from Oxfordshire, England. Contact him at [email protected].

Here’s a project I’ve been working on which kind of started on a whim a few days ago.  I’ve had two NJQRP DDS Daughtercards lying around, the older versions without the output amp update.  I decided to interface one permanently to an Arduino and build a dual 10 and 6 meter beacon.

Is your lab as messy as mine?

The Arduino alternates the DDS frequency between 28 Mhz and 25 Mhz and CW keys the amplifier board.  For the six meter transmitter chain I’m doubling the DDS 25 Mhz output to create the 50 Mhz six meter signal.  Output power on each band will probably be around 250 mW.  I’m probably going to put the unit in a weatherproof box, install it in the backyard, and attempt to power it with solar power.  In addition to doing the CW keying and DDS programming, the Arduino will also measure and announce the battery voltage and perhaps the solar panel charge current.  For antennas I’m thinking of simple wire loops.

Several years ago I ran a 100 mW ten meter beacon.  I like lower power beacons; it’s more of a treat when people report hearing them.  The previous ten meter beacon got quite a few DX reports from Europe during the last solar cycle.

Collage of photos, click to enlarge.

Actually it’s a pity the beam has gone before I could make any tests. One of the loop antenna supports snapped and I had to cut the wire. But I can overlook the damage. My most important all band vertical is still working. And it’s nothing compared to the damage my “neighbour” station PA1A has. His 150ft (45m) Rohn tower with yagi antennas has snapped. He has been lucky it did not fall on his new house, don’t know what happened to the yagis exactly. Actually same thing (cause) happened to me if you take a look at the photo, although  my “tower” was only 16ft (5m). What I learned already this new year is that “high towers catch much wind”. I extended my loop antenna from just 7m to 8m heigth last year and it didn’t work out. Sometimes a little difference has a huge impact on the construction. I’ll repair the loop and will take it to just 7m again to be on the safe side. We can’t joke with nature and since I live near the coast wind can sometimes be very malicious.

Windchart  from PA1A website: 34m/s=120km/h

Bas, PE4BAS, is a regular contributor to AmateurRadio.com and writes from Groningen, Netherlands. Contact him at [email protected].

This was a very cool contest only lasting 3 hours on a Saturday morning giving me with some nice radio time and time to get other things done as well. The QRP ARCI Pet rock contest (please if you know why it's called the Pet Rock contest let me know) is a great way to make some nice QRP contacts. One thing I did find is you sure do put the rig's filters through the paces as you try to copy some signals that are very close to the noise floor. I was not in this one to win it or even come close but to log some contacts and look them up on QRZ.COM to learn about who I just contacted. The contest started at 10 a.m. local time, there was nothing on
10m, 15m gave forth some contacts but the best band was 20m. In this contest it was nice  leisurely  CW not like the world wide contests were CW sounds more like machine gun fire! Also during the occasional contact more was given than the required exchange info.....SAY IT AIN'T SO........we tossed around our names, rig and at times a hearty 72. ( that was not a typo 72 is the 73 of QRPers) This was the first time the Elecraft P3 was used in a contest and it was a great aid. It would show you what looked like just the noise floor but in the water fall below on the display a signal is made very apparent. Then along with the K3's APF (audio peak filtering) the signal just jumped out and a contact was made. This really was the first time I was able to see how great the APF was on the K3 I had tried it in the past and to be honest was not impressed but that has changed.
Power output          5 watts ( I can say I operated QRO compared to others)
Total contacts          9
Total points             2352
It's no record breaking contact count but this short contest was a blast there were some contacts I just could not put in the log as I did not get the full exchange due to fading. Also at times I got so excited about making a contact it wasn't until the contact was complete and it was ready to be entered into N1MM that I realized it was a Dupe!!! But not once did I get the CW sent to me B4...sorry for not paying closer attention gents and ladies regarding this but thanks for your understand.
Mike Weir, VE9KK, is a regular contributor to AmateurRadio.com and writes from New Brunswick, Canada. Contact him at [email protected].

It’s always exciting to hear an astronaut from the International Space Station active on 145MHz. Over the last few days I’ve heard activity a couple of times and the second time, I had my iPhone handy and I shot a quick video, which I hope you might find interesting.

Tim Kirby, G4VXE, is a regular contributor to AmateurRadio.com and writes from Oxfordshire, England. Contact him at [email protected].

Nothing to do with Verdi or Rossini, nor the web browser of the same name. OPERA is a new weak signal digital mode that has been developed for use on the amateur LF (500kHz) and VLF (136kHz) bands.

Information about it seems to be a bit hard to come by, but there is an OPERA Yahoo group from where I presume you can download the latest version of the software. I managed to find a copy and was surprised at the sophistication of the program. It already has working CAT support for many transceivers including my Elecraft K2 and K3. It also has a built-in chat system showing reported signals from other users.

Although the new mode is apparently the invention of Graham, G0NBD, the program has been written by Jose Alberto Ros, EA5HVK, author of the ROS digital mode, and there are clear similarities in the user interface. The program supports all amateur bands from VLF to 6m but currently you can only select the frequencies 136kHz and 500kHz.

There are actually two OPERA modes, one of which is claimed to be even better (i.e. work with even weaker signals) than the WSPR mode. What is particularly interesting about OPERA though is that it does not need to use a sound card to send a transmission. Although the sound card is an option – and a convenient one for users already set up for data modes – OPERA actually (if I understand correctly) uses on/off keying, in other words CW (though not Morse code.) This offers the potential for long distance contacts to be made using ultra-simple QRPP (very low power) transmitters designed for QRP CW use – though I imagine that success depends on use of a very narrow bandwidth so you might need to pay more attention to transmitter stability than you would need for Morse code.) If the digital encoding scheme is published then it would also be simple to build microcontroller based beacon transmitters.

As I am not equipped to operate on the 500kHz or 136kHz bands I have been unable to try OPERA out on the air myself. But it certainly looks an interesting mode, especially if it is opened up to allow use on the HF bands where it could be used as an alternative to WSPR and QRSS CW modes.

Julian Moss, G4ILO, is a regular contributor to AmateurRadio.com and writes from Cumbria, England. Contact him at [email protected].