Portable Rig & Portable Loop

Portable-Suitcase-Rig

My Portable Suitcase consisting of the following:

  • Small Suitcase bought from Conrad-Shop
  • FT-857D
  • LDG-100 Tuner
  • PL, N antenna-plugs
  • designed and printed some parts on my Solidoodle 3D Printer
  • Powerpole connectors, fuses and
  • some wire

The main problem was the space – I choosed this small suitcase to fit into my backpack so my rig has to fit inside – it took a while after I found the perfect combination of the ft-857 and the LDG-100 and the cables etc..
Also I wanted to have the antenna and power connectors on the outside. After some hours of fiddeling and drilling and mounting – the solution looks like this:

Picture showing a Portable Rig Suitecase

Portable-Loop

After that I looked up the internet for a tutorial for portable loop antennas. I found some great sites:

Big thanks to those guys!!

So I

  • cut some Ecoflex-10,
  • bought an electric-box,
  • PVC-Pipe,
  • tripod from my digital-camera
  • designed and printed some parts on my 3D-Printer (all the blue parts you see on the pictures) and last but not least
  • asked my neighbour Franz for some capacitors for testing. (special thanks for that :-)

Thanks to the calculation-sheet from DL8NDG I aimed for a Loop of 1m diameter, so 3,142m of Ecoflex for the big loop and 62,8cm for the small loop (abt. 1/5)

As the capacitor is just a normal one usually used for just receifing – I tested it with 5W FM and saw no sparks jumping through the plates (10W already showed little sparks)
so I definitly have to go with a capacitor with greater distance of the plates – these can be bought from Schubert Gehäuse which I’m expecting to receife soon. I choosed DK4 and DK7 I will see soon how this works.

Showing portable Loop Antenna

But back to my current setup with the small capacitor. As 5 watts seemed to work I definetly wanted to test my setup with QRP 5W only – and it should be sucessfully :-)

I build up the antenna in about 4minutes, plugged the coax into my rig-suitcase, pluged my 12V 7AH battery in and started working.

After some searching I found a strong station on 20m GS3PYE/P was calling and having some stations answering. So a bit away I tuned the capacitor for maximum noise and tuned with 5W to lowest SWR. As there where some other strong stations calling him I tried more than once – but finally he recogniced the portable QRP station and gave me a real nice report of 56 with which I was very happy.

Later I tried again on 20m and heard a station from the azores CU5AQ I tried calling him and he answered me with real 57 report – I’m very happy about such nice reports.

A station from sizilly island IT9… on 40m was not able to hear me for a report so I guess the efficiency on 40m is not good – probably this can be enhanced when using the new capacitor and using 10 or 20W.

Summary

All in all I’m very pleased with the results – it feels great to build an antenna which works in QRP 5W mode into about 3500km distance. Sure band has to be quite and no strong stations beside – but with some patieness I can work europe stations.

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