SOTA Microwave Awards

SOTA Microwave Awards – Simplex Operations on 23cm 1296 MHz and 13cm 2.4 GHz

Images/Photos: © Copyright 2017 Andrew VK1AD

13 cm 2403 MHz – Summit to Summit 150 km

VK1AD 13cm Summit to Summit (S2S) 150 km – 21 April 2018

13 cm 2403 MHz – Summit to Summit 50 km

VK1AD 13cm Summit to Summit (S2S) 54 km - 3 March 2018

VK1AD 13cm Summit to Summit (S2S) 54 km – 3 March 2018

13cm 2403 MHz – 100 km

VK1AD 13cm 114 km – 21 April 2018

23cm Summit to Summit Achievements

VK1AD 23cm Summit to Summit (S2S) 100 km – 28 July 2017

23 cm 1296 MHz Awards

VK1AD 23cm  300 km Microwave Award – 8 July 2017

VK1AD 23cm 200 km – 28 July 2017

Last Update: 19 May 2018

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Recent Posts

SOTA – 2.4 GHz Yagi failed at Mt Tumorrama VK2/SW-027

Sunday 27 May 2018 7:30 am Mt Tumorrama. My homebrew 2.4 GHz Yagi had failed at when I noticed the 2.4 GHz 2.5 watt SG-Lab transverter SWR LED had changed to RED! Hmm.. bugger that wasn’t expected.

I didn’t have time or the tools to repair the antenna so I persisted with my backup antenna a 2.4 GHz Bi-Quad (below). I was pleasantly surprised by the performance of the Bi-Quad by successfully working Al VK1RX/P for two SOTA S2S contacts at VK1/AC-023 and VK2/ST-005, Dimitris VK2COW over a 64 km path and Matt VK1MA/P S2S at Mt McDonald VK1/AC-048 along a 39 km path of multiple 1200 m ASL mountain ranges.

Back to the 2.4 GHz Yagi. Today, using a pair on 2.5 magnification glasses I took a closer look at the folded dipole assembly. This is what I found 😦

2.4 GHz folded dipole assembly

Close up – 2.4 GHz folded dipole assembly – You never know what can go wrong at SOTA summit!

Let’s crack open the soldering iron and fix that bad boy.

Wow a clean break. A stress crack between the SMA center pin and the copper dipole

Earlier photo of the assembled 2.4 GHz Yagi

Balun impedance transformer – 43 mm length of RG402

For info – 2.4 GHz Bi-Quad photo taken earlier in March 2018

March 2018 – 2.4 GHz Bi-Quad photo courtesy of VK1MIC

73, Andrew VK1AD

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