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Station Antennae

  • Diamond CP6 Multiband Vertical HF Antenna
  • Solarcon A99 - 28MHz to 18MHz
  • End Fed Vertical 3.5dB gain for 144MHz (in roof space - not shown)
  • Inverted Vee Dipole resonant at 14 MHz (in roof space - not shown)
  • Two 144MHz, 6 element Yagi beams in the roof space
  • Inductively loaded end fed wire - 1.8Mhz to 7MHz.
  • Wonder Whip for portable operations

Diamond CP6

Bands: 3.5 -50MHz (CP6) * Power: 200W * VSWR: Better than 1.5:1 * Socket: SO-239 * Height: 4.6m * Radials: 1.8m adjustable

 The CP6 covers six popular HF bands, including the 6m band. For DX work you need low angle radiation which is just what you get from this popular model. It will outperform some dipoles when it comes to long distance contacts and even compares favourably with beams located 10m or more above ground. Unlike other verticals you dont need long wire radials. With this antenna you get adjustable rigid radials that are self supporting, and a DC return in the base matching unit helps the antenna get rid of static noise which other models suffer from. You can adjust the antennas for each band, something you will have to do on 80m as the bandwidth is quite narrow. The radials may be arranged in a 360 degree circle or 180 degree arc.

A great little antenna that I have no hesitation in recommending. The CP6 has allowed me to work Japan, Brazil, Canada, USA and the Chinese border with Kazakhistan (during a period of poor propagation - 2003) in the short period that I have had this product. Stations in the Australia and New Zealand are regularly heard, but I have yet to break the pile up of stations calling VK and ZL! The build quality is impressive and it is possible to construct and fix the antenna alone. In conjunction with my Yaseu FT920AFC the antenna tunes the full amateur bands, at full power, on 7, 14, 18, 21, 28 and 50MHz. On 3.5Mhz the bandwidth is restricted to 80kHz (although I have yet to adjust the length of the radials).

 Additionally I am able to operate the antenna on 10, 18 and 24.5Mhz. This is achieved by selecting the desired band, reducing the FT920 power to 5Watts and using the ATU to tune the CP6 at low power. The next stage is to switch on the ATU, increase the power to 100Watts and transmit! The SWR is approximately 1.5 and has permitted me to use the CP6 to contact Zambia (CW) and USA (SSB) 18MHz, Canary Islands (BPSK)10Mhz from my QTH on the Isles of Scilly.

 Living at sea level, with the beach 15 metres to the rear and 35 metres to the front, the antenna has had a severe buffeting from the wind. Up to November 2004 it had withstood gales of up sixty-five miles per hour.  However, a recent severe storm, has damaged the top section and it is now used for 50 MHz QSOs.

The CP6 tends to detune when there is fog, rain or a sea mist and the bandwidth is reduced by approximately 10 -15%. The manual, written in English and Japanese, is adequate but could be improved by providing more technical details. For example what is the safest power rating for continuous cycle use? Customer service at Diamond is excellent, my e-mail enquiry about earthing requirements was answered within hours. If like me your garden is very small you will find this antenna an excellent solution to your requirements.

Solarcon A99

This antenna is designed as a half wave, over a quarter wave variable mutual inductance tuned vertical.  It can be used up to 2000Watts and will tune using the internal ATU of the Yaesu FT920 from 29.700MHz to 14Mhz.  Performance has been excellent on all frequencies from 18MHz to the FM section of 10 Metres.

End Fed Wire

Approximately 20 metres of inductively loaded wire is fed: from the front of the house operating location, in a first floor room; into the roof space and exiting via eaves at the rear of the building.  In conjunction with a Home-brew T Match ATU, I am able to operate from 1.8MHz to 7MHz.

Inverted Vee Dipole

This antenna, resonant at 14.250Mhz follows the profile of the roof.  Amazingly I have worked Australia, VK8DP in Darwin RST 55 with this antenna.

Wonder Whip

For portable operation. Link to Wonder Whip homebrew project.

 

144MHz 6 element Yagi beams

I have constructed two six element Yagi beams for Single sideband operation.  Both are placed in the roof space and on fixed NE and SE headings.

 

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