VK6/SW activations on the Bibbulmun Track

I spend a week walking a part of the Bibbulmun track – a long distance walking track in Western Australia. I knew there were a couple of SOTA summits nearby. Turns out there were four summits pretty much right on our track. Over a week of walking, I activated three of them, and activated one of them for the first time ever. Thanks to Phil VK6KPS for planning the walking — it made it nice easy hiking.

This was proper hiking. We carried all we needed for a week (food, cooking gear sleeping gear, tent/bivvy). There are track shelters a days’ walk apart but sometimes a tent is needed if the shelters are crowded.

In addition to all of that, I squeezed in my KX-2, a SOTABeams end-fed 40m wire, a 6m fibreglass fishing pole, and battery and solar panel. It all felt a bit heavy but after a few days, I was used to it.

I’d be using a callsign like VK/G0WCZ/P. Is that enough of a mouthful? Hooray for CW keyer memories 🙂

Now, to the summits:

VK6/SW-039 Mt Randall

I grabbed the gear and walked the 1km to the summit in light rain on the Friday afternoon. Quite windy and showers coming and going. Got to the summit and the rain and wind intensified. Not really getting-the-radio-out weather without a bothy bag or something to hide in. I decided to go back the next morning before we set off walking South.

Grey and rainy Friday up Mt Randall
Looks like an Elecraft advert. KX-2 out where it belongs.

The next morning was much better. I was back up at the summit and set up. The summit is a bunch of big granite slabs and massive boulders. I set up on a rocky slab and jammed the fishing pole in a crack between a couple of boulders. Got my four contacts easily enough: 2 on CW, 2 on SSB, and all of these on 20m. Conditions seemed a bit strange, is it just that I’m not used to how 20 metres sounds in VK6? I worked into ZL1, VK3, VK4 and W6!. That W6 was a surprise. I just got my four contacts, bagging two points and moved on. I needed to get back to the shelter, grab the backpack and walk to the next shelter to keep our walk on schedule.

VK6/SW-031 Mt Cooke

Mt Cooke was right on the track, just after the Mt Cooke shelter. The morning of our third days’ walking we climbed Mt Cooke and settled in for a little SOTA from the summit. Was a bit of a slow start our of the hut so it was late morning (0300 UTC) and the bands seemed pretty quiet. Two contacts only, both into ZL1, on 20m. Nothing else. Activated, yes, but missed out on the 2 points.

Settling in on Mt Cooke
Trying out SSB. Didn’t help.

VK6/SW-037 Boonering Hill

A hot day. Again late morning. We stopped at the spur trail to the summit and it seemed like it was going to be a bit of a tough one, given the time. Also wanted to conserve batteries for Mt Wells that was still to come. Decided to not activate this one and just keep walking.

With an earlier start, it is only a short detour from the main track – perhaps a 1km round trip and 100m vertically to get to a nice granite top. It is worth considering if you are walking by.

VK6/SW-031 Mt Wells

Mt Wells had never been activated so it felt worth saving battery for. I’d brought a 5W panel and a rechargeable battery with me. However, the battery and the panel weren’t quite in agreement on how once should charge the other so not a lot of fresh battery from the sun. The night’s shelter for walkers — this time actually an old cottage — was also well within the activation zone. There was an old fire lookout tower as well which looked like a great place to operate from.

The fire tower — there’s a platform half-way up (just above the tree).

Our walking had got a bit quicker. We were leaving the shelter earlier and were now mostly arriving at the next shelter before lunch. So a quick lunch and time to set up.

The tower looked obvious as a place to operate from. There is a convenient platform half-way up complete with a couple of plastic chairs. I set up the end-fed half-wave with the counterpoise going down to the ground and the main 1/2 wave wire heading off to the 6m pole in the garden beyond the cottage. Having a chair to sit on and one for the rig made this a bit of a cushy operating position.

After getting a couple of spots out there, a few CW contacts 😀

Again, contacts weren’t coming that easily. There was QRM from the comms tower on the summit and that was making 40m a bit hard to work on. I’d got an idea that CW contacts were few and far between so started out with SSB on 20m. I tried to break in to some QSOs and did a lot of calling CQ after spots. Nothing happening.

Finally I spotted on 20m CW (14.062) and got rolling with QSOs. Three fairly easy contacts (ZL1, VK4, ZL1) got me nearly there. By now the battery was dwindling so moved to 40 and spotted again. VK7CW came back after a few calls and as the battery percentage counted down to zero, we had a brief signal report exchange and I had my four. A dit .. dit and I looked down at the battery. Still delivering 2-ish watts receiving, and reading a barely possible 0 percent charge. Hooray for over-specced batteries!

End of fourth QSO, 0% on the battery!

Mt Wells activated for the first time, and I get my 2 points. Just.

That ended SOTA for this trip. The rest of the walk was enjoyable and after 8 days we emerged off the track into the town of Dwelingup for a beer at the pub.

Was definitely work carring HF gear with me. Huge thanks to Phil VK6KPS for hiking guidance, antenna wrangling, photos and enthusiasm.

A few lessons learned I might as well document here:

  • Generally, keep calling CQ and keep spotting. QSOs seem a bit more scarse in VK6 than in Europe. Guess that makes sense.
  • SSB is hard work sometimes but can surprise. So being able and happy to do all CW activations really helps.
  • I’m now pretty happy and confident with CW QSOs for SOTA after a few activations. Now I don’t have to think so hard, will be easier to do quick activations.
  • I need to do more work on Solar charging before the next long-distance plus SOTA walk. It ought to be easier to charge either a KX-2 internal battery or an external one even without full direct sun all the time. Possibly a KX2 battery box plus charge makes sense.

Thanks to all the chasers. See you again from a summit soon I hope.

Oh, and I think I have a new lucky charm. The little SOTABeams mug that travelled with me:

The CW Commuter

I’ve written before about trying to use CW while commuting. I was looking into a bunch of different ways of achieving commute CW operating via the Internet.

And going back to 2016, I started thinking about how to send/receive CW via a lossy datagram-based internet connection.  Lossy, because us hams can do error correction and deal with QSB already with our operating practices.   And it is more like real radio if it is a bit unreliable.

The protocol

So back in 2016, I wrote down an on-the-wire protocol for this — called bitoip.  Each end would send and receive packets of carrier-on and carrier-off events to communicate the CW with real timing (and therefore hand-key “fist” dynamics) — without needing to run up a pile of audio channels and all of that.   I assume it this ought to be low-bandwidth and reasonably reliable but not too reliable.

Protocol details in the GitHub repo at https://github.com/G0WCZ/cwc. See bitoip.md for those details.


Okay, so how about the equipment needed for this?  There are two components:

  1. A station – that turns keyed morse into packets, and receives packets and turns them into a tone in headphones or can drive a separate oscillator.
  2. A reflector – that creates a number of channels that stations can connect to.  This really just broadcasts to connected stations what it hears coming in.  Plus other enhancements if needed later.

So now let’s look at equipment options:


My minimal station would be a tiny box that can wifi to my phone hotspot and has a key and a headphone jack.  Optionally a volume control and channel selector.   That’s a minimal option.  That’s a Pi Zero W with a couple of parts to add a headphone output.  Other ways would be — a PC or Mac (Linux, Windows, OS/X) with a serial interface for key and using the built-in audio.

I’ve built basic Go code for a one-channel station client that will compile for most platforms. This includes the serial and Pi GPIO I/O for key interface (in/out) and PWM audio.   That’s in the repo. See https://github.com/G0WCZ/cwc/tree/master/go

I’ll tidy up the hardware and publish that soon.


I’ve built a basic one-channel-only reflector in Go that works nice on a Pi, on OS/X or Linux.   That is also in the repo at https://github.com/G0WCZ/cwc/tree/master/go

There’s a basic single-channel reflector server running on cwc0.nodestone.io:7388

Initial Testing

CWC Pi and serial development

Over this Easter break, I’ve writing Go code and have been doing some tests of the basic station and reflector.  It works.  I suspect some more work on time sync is needed but for now, it seems to capture, transmit, receive and reconstruct morse okay.

More on Github

I’m going to keep working on this. Feel free to join and collaborate over on GitHub at https://github.com/G0WCZ/cwc or leave a comment here.