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VK3TDX Australia flag Australia

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Page managed by NF6V Lookups: 54869

QSL image for VK3TDX

My general info below:

I am USA call NF6V ex WA0ARA now retired and located in a small town 150km west of Melbourne called Elliminyt.

My Main rig is an Icom IC-7700 with a Collins 30L-1 and a Heathkit SB-221 amplifiers in service. Friend Patrick VK2PN (below right) is using his trusty K3 as our second rig in the CQ WPX CW contest recently in multi-two operation boosted with his Expert 1K-FA amplifier .   Patrick is a keen CW contester and I enjoy multi operation with him.  We currently hold the VK record for multi-two in this contest.




Above is the view looking toward EU across the lake below. The tower is ~20m high and is 200 meters above the lake. 

The yagi elements have numerous plastic cable ties along each length to discourage birds.


The QTH sits on an acre of elevated land with a good open view to the north so most world ham locations are in the clear.

40M Vertical & 80/160 M Inverted L's looking North photo taken before the recent rhombic wire array addition (left) and Cushcraft D3W WARC Dipole (right)

I have a rhombic antenna designed for 15, 12 and 10 meters but it works well on 20 meters as well. Even on 40 and 80 it works well within VK with it's high low band takeoff angle and near omnidirection pattern on 40 and 80.  It was constructed based on two wavelengths per leg on 15 meters and is focused on EU per design and the pattern diagram below. Not shown on the diagram is an 800 ohm terminating resistor which helps SWR and minimizes noise from the back side.   A great antenna that really performs in its design direction.  I advise everyone with the necessary real estate to consider one of these great antennas.  If you have questions please email me.


Above are the dimensions and on the right the calculated gain pattern for 10 meters. Notice the nice side lobe to JA! Due to the sloping hillside terrain the takeoff angle on 10 meters is ~2 degrees. Similar patterns on the lower bands with decreasing gain and increasing takeoff angles but I get good reports from EU on all bands as low as 20 meters.



The main tower (above) is about 20 meters high supporting an A3S tribander, an A50-3S 6 meter yagi and a 160 meter inverted L in addition to the rhombic feedpoint. On the lower left of this pic can be seen the feed point of the rhombic driven with ladder line. Photo on the right is an 800 ohm termination of the rhombic nicely in the clear looking to the north.

Above are the mid points of the rhombic wire. I am fortunate to be in the clear with enough room for this wire array with low local noise. Photo on left is looking toward EU, the center of the radiation pattern.


Above shows the 40/80 meter vertical and most of the rhombic wire array. Thank you to my XYL Alicja for not objecting to all this wire and pole collection disturbing her view!


I participate in most major contests so please point towards VK in the next contest so I can give you a multiplier.

Note to RTTY contesters: Please always send your contest serial number at least 3 times! When you send only twice they often decode one digit different and we must waste time because I must ask for a repeat. Please at least 3 times your serial number!


Below are my top contesting achievements so far. . .


Worked all Europe (WAE) continental winner in all three modes



QSL direct*, Bureau, LoTW or eQSL

* Paper QSL policy - $2USD or IRC for direct reply. If not included I will respond by buro. I have a nice QSL to send and I want yours but I must have help with the high cost of postage from VK. Thank you! (Contest card on the right above will be sent unless you request photo card on left.)


With supportive XYL Alicja - 40km South of my QTH at Australia's 12 Apostles coastline (same location as QSL photo from above)


Thanks for the visit and I hope we can QSO soon.



Above "retro" photos - (left) 1961 as novice WN0ARA at age 15 and (right) WA0ARA circa 1962 enjoying AM and CW traffic nets!

Member of:

WIA (Wireless Institute of Australia) http://www.wia.org.au

VK Contest Club http://www.vkcc.com

ARRL http://www.arrl.org/

Pacific DXer's http://pacific-dxers.com


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