Latest News – 13 April 2020

Lets hope we can run our regular meetings again sometime this year.

Club Project Idea.

Recently a few were discussing a Yagi Build Project. Charlie ZL4CB and Brent ZL4KT were keen to go and TT ZL4TAE has purchased some nylon stock for element standoffs.

The first plan is for 2m band yagis. I personally like the YU7EF designs ( I purchased locally a pair of 2m yagis about 13 years ago. An SWR sweep SWR revealed that they were tuned mid band and tuning was quite sharp and not very good for 2m DX.

A re-design and re-build based on YU7EF’s designs, adjusted for optimum tuning at 144.5 MHz made a big difference. The modelling showed more gain, increased bandwidth and a very good match and the results confirmed these. I even worked the Tekapo 680 repeater from Bannockburn that season.

Interested? Think about what size yagi you would like and we could look at buying alloy, fastenings and make insulators on a cost recovery basis.


Our first Resilience Solar Project is go for 665 and APRS and I have to say I’m delighted. David ZL4DK is making PCB’s for two related upgrades.

Allan ZL4MD is building a new APRS tray with much lower power draw and DTMF control to remotely activate the DMR’s, the ESB repeater and the IP gear. The APRS radio will transmit site data and also feed this to the APRS web site.

Number 2 project is a Top Up Supply (TUS). This will be a 30 volt mains supply at about 4 Amp and will feed the solar regulator via a pair of diodes. It will switch ON when the battery voltage drops and turn OFF when the sun shines. We could also fix this with double the battery capacity (expensive).

Number 3 project is a new aerial earthing panel. This is installed and bonds the mast, rack and incoming feeders. More earthing is needed at the hut and the pole.

Thanks to all who helped assemble and rig the solar array, run the cable, installation work in the hut and a good whack at the brrom a great club effort.

73  Terry ZL4TAE

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