My radio equipment

Transceiver

Nowadays I own a Kenwood TS-480HX, the 200W version and a Yaesu FT-857D. Both powered powered by two SPA8230 23A switching power supplies. Those power supplies do not produce any QRM at all.

Both hooked up to my pc througf a CAT interface. A Behringer UCA222 external soundcard handles the audio from the PC for digital modes.

Audio

Although the TS-480 original MC-43 handmike has a very good audio, I use a Devine DM20 dynamic microphone on a boom. I can also hook up my Behringer BB-560 bluetooth headset through my pc and do all audio wireless through the TS-480’s dataport VOX.

I use two speakers in series from a Sony home cinema set. These do an excellent job in the specific audio range of the human voice.

Antennas

I am continuously experimenting with antennas, so this part of this page changes every now and then.

The Five Band Square Halo

One of my 2020 projects was a limited space dual band halo antenna for 10m and 20m. After I added 12m, 15m and 17m, I named it the The Five Band Square Halo. The mechanical design is inspired by the Cobwebb antenna, but electrically by the famous halo antenna, which is commonly used on VHF as an omnidirectional antenna with horizontal polarization.

The Square Halo five band limited space HF antenna

The Square Halo stands about 12m from the ground. It covers 20m, 17m, 15, 12m and part of the 10m band. Addition of 6m is planned for the future.

Wire antenna

For 160m up to 30m band I am using a 15 meters long wire which runs up to the Haloweb. There the wire end is connected to a 3 meter aluminium mast, which in turn connects to the Haloweb’s aluminium spreaders, which act as a top hat capacity.

The wire is fed through a CG-3000 remote automatic tuner. A 6 meter long aluminium balcony fence acts as counterpoise.

Miniwhip

As an auxiliary antenne for my QRM eliminator, I use a Miniwhip active antenna from RA0SMS. It is mounted close to my neigbor’s solar panel installation to pick up maximum QRM for optimum performance. After sunset I use the Miniwhip for medium wave broadcast listening.

The RA0SMS Miniwhip active receiving antenna for HF

The MLA-30+ Megaloop

This is a very affordable active loop, made in China, which I added in 2020. I did some modifications on the loop itself and changed the connector for a more sturdy BNC. The Megaloop is a quiet antenna which I use for listening to shortwave broadcast and utility stations.

The MLA-30+ Megaloop active receiving antenna for 5-30 MHz

The loop is mounted on a 20 year old Channelmaster TV antenna rotor which allows me to ‘null out’ QRM sources.

The Moxon

A full size Yagi would have a too big turning radius for my house. PG0DX Henry and PB2B Dave inspired me to build a Moxon. I used special PVC tubing, loudspeaker wire and other used materials to build my own version. It performs quite well with excellent front/back ratios and up to 4 S-units more signal compared to a regular 1/4 wave vertical. Later I added 6m wire dipole to the Moxon and a 2m vertical dipole on top.

When solar activity provides propagation on 10m, I kick the Moxon in action. It’s mounted at almost 13m from the ground. Here is a picture made just after it was mounted on the roof. During years of low solar activity, the Moxon is decommissioned.

The 10m wire Moxon
10m band Moxon directional antenna

Future antenna projects

Liquid vertical

This is an antenna project which is still theory. It is a vertical antenna made out of a conductive liquid, like salt water. It can be be tuned from 10m to 40m by leveling the liquid in a vertical tube or hose using pressurized air. You can read about it in this blog post.

MMANA antenna designs

I have gathered quite some antenna design and made a few myself.
You can download them from my OneDrive.