Category Archives: QRP

SP-8: a homebrew 28MHz SSB transceiver for a UR3LMZ 144MHz transverter

Ten meters or the 28MHz band is showing glimmers of life from sunspot cycle 25. Even so, its not an obvious choice if you want to build a portable SSB monobander and have lots of contacts. But 28MHz is the IF of choice for VHF and UHF transverters. After noticing the 6, 2 and 70cm transverters available on eBay from the workshop of UR3LMZ and the good reports from buyers, I cooked up the idea to build a 28MHz ‘transverter IF’ transceiver, to be paired with one or more VHF or UHF transverters.

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SP-X, a pocket rig for the CW activator in a hurry!

I’ve long been interested in compact and fairly minimal SSB and CW rigs with good performance. I’m not into bells, whistles or menus. Menus are for restaurants! When hiking, walking or bouncing around summits I want to minimise things that are not absolutely necessary, things that can go wrong. Less is more when it comes to a transceiver for portable work.

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Ten Tec Model 1056 DC Receiver – is it any good, and what to do with it?

One of life’s simple pleasures is to rediscover something that bought you engagement and enjoyment in the past. And in COVID lockdown, stuck at home, it’s the perfect time to rummage through boxes in dark corners to sort, throw out, and rediscover old treasures. So it was that I came across this Ten Tec direct conversion receiver board, built around 20 years ago.

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Something old, something new: A four-band 5W/50W SSB/CW transceiver (‘Summit Prowler 7’)

‘Summit Prowler 7’ is my name for this scratch-built multiband SSB and CW transceiver. This rig covers four of the most popular portable, Parks and SOTA bands — 80, 40, 30 and 20m, at a power level of 5 watts, but with an in-built switchable 50 watt power amplifier, so that you have the option to call up the extra power if the going gets rough. The rig weights in at around 1 kilogram or 2.2 pounds, about the same as an FT-817, and is similarly sized. It’s a rig for a wide range of portable situations, and is equally at home on the shack bench.

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Pocket-sized homebrew 40m CW QRPp/QRP transceiver

In May 2019 I activated Mt Dandenong VK3/VC-025 with my latest homebrew rig. It was a CW only activation, five QSOs completed, but while I was handing out 599s, the reports coming back to me from the chasers were well down. Over the next few days on OZSOTA (the VK SOTA discussion group) several chasers made comments to the effect that they could hear other VK3s but nothing much from me. When regulars Tony VK3CAT, Ron VK3AFW and Gerard VK2IO reported the same thing, the evidence for a problem at my end mounted.

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Social distancing project #1: Lightweight Linked Dipole

The coronavirus has stopped just about everything, and is undoubtedly changing our lives forever. With almost every group or event cancelled, there are predictions of mass boredom and social isolation. Many people apparently have no idea what they’ll find to do with their time. How odd. That’s never been a problem for makers like me. So in the interests of the bored and isolated, I offer this story of something useful that can be made in an afternoon — a linked dipole.

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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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