Category Archives: QRP

QRP By The Bay, Chelsea Beach, Melbourne, Saturday 8th February 2020

QRP By The Bay is a regular meet-up of amateur radio operators, makers and experimenters , Chelsea Beach, Melbourne. On Saturday 8th February the weather was summery, a warm 28 degrees C, but windy, 35km/h blow from the south-east. A strong turn out resulted in lots of conversation, show-and-tell, and general story telling. The video shows some of the faces and activity. If you want to know more about any of the people or projects drop a comment below.

I was expecting Peter VK3YE to take his wade-tenna into the shallows for some pedestrian mobile contacts, but the wind made that option risky. No matter, there was plenty to see and discuss at the tables.

Thanks to Peter VK3YE for continuing this series of ‘eyeball’ QSOs, a now regular and much appreciated date on the amateur radio calendar in Melbourne.

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Federation Range VK3/VN-029 Jan 2020, with VK3EAR and VK3KR

Federation Range at 1490m is the highest point in the Yarra Ranges, and a comfortable 4km walk from Lake Mountain resort, 90 minutes drive north east of Melbourne. The 24th January 2020 was planned a few weeks in advance and fortunately, the weather was favourable, the area was well clear of bushfires, and Owen VK3EAR and David VK3KR were both able to join in.

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Two activators, two summits in the Yarra Ranges (25/10/2019)

On the 25th October 2019 I dragged David VK3KR out to the Yarra Ranges for some SOTA fun. The story is told by the video. Thanks to all chasers!

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QRP By The Bay, Chelsea Beach, Melbourne, 2nd Nov 2019

QRPers at play.

QRP By The Bay was held again at Chelsea Beach on Saturday 2nd November 2019. A crowd of QRP, homebrew enthusiasts, and amateur radio knockabouts gathered on a wet and windy day, some with show-and-tell items, some obviously shy of bringing a full scale portable station on account of what the unpredictable weather might do.

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Summit Prowler 6: A pocket-sized SSB/CW transceiver for 80, 40, 30 and 20m

Peter DK7IH is a master of compact homebrew transceivers. I’ve been reading his excellent blog where he chronicles more than half a dozen homebrew HF transceivers and related projects. Most are compact SSB superhet transceivers with digital VFOs, AGC, metering and PAs in the range 5 to 50 watts. A few of these rigs are just so remarkably tiny I wonder how he has the persistence and patience, not to mention how he gets them stable. With Peter’s fine examples in my head, I started daydreaming about a compact SSB/CW transceiver, hoping to go a fair bit smaller than my slightly chunky attempt at a hand-held from last year.

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Mt Hotham SOTA Weekend Feb 2-3 2019

A brief post to share a short video from last week’s Mt Hotham SOTA weekend. Once again, Brian VK3BCM hosted several dozen SOTA and mountaineering enthusiasts at Anton Huette Lodge, Mt Hotham, for two days of summit bagging and SOTA talk. On the way up I activated the two ‘easy’ summits on the Mt Buffalo plateau, The Hump and The Horn.

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Mt Feathertop (VK3/VE-002), 19th Jan 2019

This year I tackled Feathertop as an overnight walk, leaving the car on the side of the Alpine Highway near Diamantina Hut at 1645 on Saturday 19th Jan 2019, after having driven up from Melbourne. It was about an hour later than I’d hoped for, but a daylight savings sunset time of 2032 gave me nearly 4 hours in the warm but cooling air to get to Federation Hut. The walk in along the Razorback Trail was in good conditions, but I was carrying my SOTA kit and camping gear, not well optimised, way too much weight, and it all started to hurt in the last hour. I met at least a dozen summiteers on their return leg, some looking like troops limping back from a battle, a few considerably worse for wear. More on this later.

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Getting Owen KJ6AKQ/VK3EAR on air

September 2018: I ‘met’ Owen KJ6AKQ on Twitter, I cant recall exactly how or when, maybe 6 months ago. He was a KJ6 who had landed (with family) for work in Melbourne, with a KX3, a real ‘ham sensibility ‘, and an obvious desire to get back into the hobby. But living in an inner city townhouse was going to cramp his style somewhat. After finding how to take out a VK3 callsign he registered VK3EAR. Callsign, rig, but no antenna. I knew he was itching to get on air when he started calling CQ on Twitter.

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A compact Arduino, si5351 VFO with Keyer and OLED display

The remarkable compact transceivers of Peter DK7IH inspired me to dream up a compact transceiver of my own. This project would be an experiment on a shirt-pocket scale — not as dense as some of Peter’s rigs, but small on my scale. Starting with the PLL VFO/controller along the familiar lines of Raduino (Arduino Nano and si5351), I sketched out a physical design, and it became clear that the display choice would dictate the size of this module. Where small displays are concerned, there’s only one option … OLED.

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A scratchbuilt G6LBQ BiTx ‘Walkie-Talkie’ for 40 and 20m SSB/CW

After completing a 6-band SSB/CW QRP transceiver (Summit Prowler IV) I found myself thinking about a more compact QRP SSB/CW rig for SOTA, with two of the main day-time SOTA HF bands (40/20m). The design driver this time was to try a different ‘form factor’ — I wanted a rig with a narrow and long case, such that it would easily slide inside a backpack, and on a summit sit vertically against a rock or be hand held. All my SOTA rigs so far use both front and back panels for connections and controls, so they need to sit level on a horizontal surface. As most rocks or tree stumps are low, you can’t easily read the display. Some designers get around this by putting the display on the top of the box, a sensible adaptation but one that makes the rig look like a flounder. Because I spend a lot of time building and using these radios at home on the shack bench as well as on a summit, I wanted a design for use in both situations.

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