FabLab first

After some cautious first steps my first laser cut parts have been made. The case for the clubs upcoming WSPR kit build prototype has been, well, lasered.

IMAG0293

There’s a couple of minor points to address but for a first effort I’m pretty pleased.

The idea was to cut for a single sheet a ‘desktop’ case for the U3 WSPR transmitter that could display a callsign or something similar on the front as a customisation as well as being simple and space efficient. Yep, you can buy a case but its quite nice to be able to make one in Cumbria rather than China. I should be able to get 4 and a half of them out of a single 300mmx600mm sheet.

All I have to do now is fix the faults and make it right next time.

Portable Hexbeam v’s Cobwebb

After a few more weeks of not getting on the air I managed to man handle the portable Hexbeam up to about 4 above ground level (Note: must get that tilt base sorted out) to compare it against the Cobwebb I have in the loft.

So before we go down the ‘It’s not scientific’ route. I’m ok with that, no big deal its just a bit of fun.

There are some significant differences between the two antennas that I hadn’t fully appreciated. Firstly the noise levels on the Cobwebb were quite a bit higher, which seemed to make the Hexbeam sound quiet, when in actual fact there was no significant difference on the higher bands when it comes to S points. But, the lower noise levels made it much nicer to use. The image below shows what I mean. There is a band of ‘mush’ slap bang in the middle where I switched onto the Cobwebb. Just so you know, the Cobwebb was way quieter than the vertical I had before.

cuSDR Hexbeam vs Cobwebb

It’s not a huge visual difference on the screen but the ears make it obvious. The gain on the Hexbeam made it easy to make contacts with C06LA answering on the first call, I’d never expect that on the Cobwebb.

You can also see that the signal strength is fairly similar, that was W4UH calling CQ.

So not much in it when the Hexbeam is really low, I’m sure it’ll beat the pants off the Cobwebb at 12m but interesting to see that the Cobwebb is ‘noisier’. Especially as I thought it was quite a quiet antenna.

Portable Hexbeam

Saturday saw me opening a beer celebrating finishing off the new decking area…which means….Sunday saw me finishing off my portable hexbeam from Folding Antennas. The build took quite a while, about 8 for the hardware and about 3 for the layout and tuning. I’ve not used it much in anger as the rains started coming.

An early doors write up is here…..but so far its looking worth the build time. Here’s a shot of the half finished decking…oh and a half finished antenna.

2014-03-25 12.10.50

QRSS v3 kit

Before the decking project was formally sanctioned and actioned through the domestic funding board / xyl I had thought about ordering a little kit to build over the summer. I had built the v2 QRSS kit from Hans Summers, G0UPL and have used it on the 30m band and frankly enjoyed both the built and the fun tinkering with it.

The v3 kit changes the design slightly in as much as it used a more common 16×2 LCD and the PCB size as increased slightly. But from what I can tell there is a deal of difference between the two designs. Both encourage the builder to tinker with the PA’s, increase functionality with GPS and use the add on LPF relay to build a multi band TX. The one big and obvious change is the used of the dedicated DDS.

Plans for this kit are to still do the build and then buy up 10 kits and build them at the BEC fab lab one Saturday. I will no doubt get a suitable date for the build day at next weeks club meeting. Until then its finish the decking or be in trouble with the domestic CEO.

More new toys

For as long as I first heard about SDR i wanted to get involved. Unfortunately children and jobs got in the way of significant investment. Until now that is. I received an email from a local ham who had an Angelia board that he no longer wanted.

‘Did I want to buy it off him?’

‘Yes’ said I before even mentioning it to the domestic CFO / xyl.

Long discussion ensued and eventually I have come away with this….

IMAG0276

Needless to say some of the domestic staff were not amused. As a consequence I have an FT817 and a VX8-GE for sale. Any takers?