Thank you for visiting my page.
My main interest is HF. When the ionosphere cooperates I can be found using digi modes on 30m. Although I can work on any band on HF from 80m to 10m, also 6m, 4m, 2m and 70cm.
I enjoy designing and building, one project I am currently involved in is the design and construction of small HF antennas, two of which are pictured above. The lefthand antenna works on all bands 20m through to 6m without an ATU. The longer one works on 20/17/15m. We have a very small garden which is open to public view, I therefore need very small HF antennas. Two other prototype HF antennas are shown below in the photos. I have also completed a remote 5-way antenna switch which is working well, parts of which are shown below. This design was published in QST over a year ago and has been successfully constructed in the UK, USA and Australia.
I am very pleased to have received the Ostermeyer trophy from the RSGB in their centenary year for a published article in RadCom 2012. This coincides with my twenty fifth year of writing. That article was published during two issues of a VSWR meter I designed. One of the VSWR meters is in constant use each time I go on HF.
There are two HF antennas and one 2m/70cms vertical working with the current station which comprises of:
Radios: Icom IC-7410, Yaesu FT-991, Smallwonderlabs 30m & 20m QRP digi rigs, Pye MX294 (2m), Motorola MCS 2000 (70cms), Midland CT-890 and an Icom IC-90E.
HF ATU: MFJ-901B & SG-239 (x2) Smart tuners.
Antennas (HF): Multiband vertical (3.5, 5, 7, and 10MHz) on the right hand side. Multi-band vertical (14, 18, 21, 24 and 29MHz) shown on the left hand side below. Also a 2m/70cm vertical, and a UHF Slim Jim for 70cms. HF and the 2m/70cms antennas are automatically switched under computer control from the shack.
Below left, the antenna installation. Below right, the current station
One of the two SG-239 auto ATUs. Power to the auto ATU and the 5-way switch is provided down the coaxial feeder with the bias tee shown.
The new remote 5-way switch slave box below is used to switch the antennas from the computer. DC power. RF, signalling and DC power all go down 100 feet of RG213 coax to the antennas. This replaces the SPDT coax relay previously used. The master unit is positioned in the shack along side the radios, the red coloured box above the radios. Both master and slave units have been produced on new PCBs.
Antennas (VHF/UHF): Slim Jim (70cm), 5-ele beam (70cm) and a half wave dipole for 2m.
VSWR meters: Revex W570, and three home brew HF digital VSWR meters.
My website: www.skunkworx.co.uk
Please do not send QSL cards as I no longer collect them.
7825319 Last modified: 2017-01-11 20:58:56, 3390 bytes
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