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EU1KY Belarus flag Belarus

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QSL: DIRECT LoTW eQSL

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Page managed by EU3EU Lookups: 46089

 

ex UC2LEG (1990-1994), EU3EU (1994-2014: 20 years of very little activity) 

I am not a member of QSL bureau, but I log my contacts in eQSL and LoTW.

If you need my printed QSL, just send me your card direct with SAE. Postage is welcome but not absolutely necessary, I will send my card direct to you in any case.

I am in progress of moving my shack to a new location in countryside. This site is easily accessed because it is connected to the capital city with high speed motorway. What makes me happy is that there is a lot of space for low band antennas and no RFI from neighbors. All my antennas, masts and tower are disassembled, I am currently using only wires and verticals.




 

My antenna: 14-30 MHz 11-element "circularizing tau" LPDA made by RA3DRC (antenna-su.ru), designed and optimized for best performance on amateur bands by RA3LE. The "circularizing tau" optimization (as W4RNL named it in the ARRL Antenna Handbook) allows excellent F/B ratios >20dB even on 20m and 10m, unlike conventionally designed LPDAs that suffer from poor F/B at their working band edges.

Homebrewing is a very significant part of my radio hobby:

For 2016 summerhouse season, and for portable activity, I've built a simple extremely lightweight 2 el Yagi beam for 20-17-15 m bands. I don't need 12 and 10m bands at this part of the solar cycle because of poor DX propagation. The Yagi is on the very short 2 m boom. The antenna weighs 5 kg only, so almost everything can be used as a mast for it. For example, I used 9m of 30x30 mm aluminium box profile.

Feedpoint utilizes beta (hairpin) match, I simply used 0.5 uH aircore coil across the feedpoint. It is tuned once for 20m band only, and is reused unchanged on 17 and 15m. This greatly simplifies changing the band which is performed in couple of minutes by laying down the mast with the antenna using the pulley on a wall, and then by moving telescoping element tips to predefined positions.

Despite the short boom length, the antenna provides >4 dBd gain and reasonable 12-14 dB F/B ratio on all of its bands. It can be quickly assembled and disassembled, unlike the popular Hexbeam and Spiderbeam designs (they provide lower gain by the way, though better F/B).

12m aluminium alloy tower with lift (by Antennae Depot - UA2FZ) with temporary antenna: 4 el monoband Yagi for 18 MHz band on 6m boom. The first director acts more like lossless matching element providing SWR 1.0 at 18.120 and even adds some gain. Antenna needed no tuning at all, I've just carefully set the modelled dimensions and obtained the expected parameters.

By sliding the telescoping element tips inside the thicker tubings to marked positions, this antenna can be easily transformed to a perfect 21-24-28 MHz monoband OWA Yagi with even better parameters. Element positions on the boom are not changed.

The docs (MMANA-GAL files, drawings and photos, measurement results in Touchstone s1p format) are in ZIP file here.

Here is the very lightweight mod of the above mentioned 4 el Yagi, but on a shorter boom which makes it more portable.

It is actually a 4 element OWA Yagi for 10 meters band on 4 meters long boom. The design uses only 2 meters long aluminium alloy tubing (mostly square) available from the local DIY store at a very reasonable price. The antenna works as calculated from scratch, providing SWR < 1.1 in the 28.0-28.75 MHz range, with the same gain (modelling shows 8.3 dBi in the free space) and F/B ratio (> 20 dB modelled, but actually more in reality on distant paths) across all of this part of the band. This is what I expected from OWA design, and what I've obtained without difficulties. It took just one weekend to build and install this antenna.

But this is not all. Modelling showed that adding telescoping extenders to the elements of this OWA Yagi allows perfect wideband matching to 50 Ohms and excellent F/B > 20dB on 17m, 15m and 12m bands! And this matching is lossless, moreover, it adds 0.5 dB to antenna gain, so it works like an excellent 3.5 element Yagi for this particular boom length. Tried this idea on vacations in June 2015, with great success. Used it as multibander, the only drawback is that I had to put it down every time I wished to change the band. It takes 15 minutes. :)

See it hovering over my summerhouse where I normally spend my vacations, with extenders set for 17m band:

My homebrew four-band (20-17-15-12 m) very lightweight 2-element "Jungle Job" type beam (G4ZU) at 12 m above the ground. Multiband matching is achieved by using a carefully calculated T-match at the feedpoint with a variable capacitor rotated by a small remotely controlled servo motor. The whole mast is rotated by Yaesu G-1000DXA rotor from bottom.

For seven months in service, only on weekends with barefoot 100 Watts, 251 DXCC countries were worked using this simple antenna. DXCC was confirmed on each of its four working bands. Now this antenna is disassembled. 

 

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8380922 Last modified: 2017-10-10 17:49:36, 9071 bytes

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QRZ Logbook Summary for - EU1KY
Latest Contacts for EU1KY at QRZ.com
dedateband mode grid Country op
3C0L 2017-10-18 80m CW JI28tn Annobon Island Yuris (YL2GM) and Kaspars (YL3AIW)  
EA1AUO 2017-10-17 40m FT8 IN73 Spain MIGUEL ANGEL
S52D 2017-10-17 40m FT8 JN76 Slovenia Iztok Saje
DF7EF 2017-10-17 80m FT8 JO30 Germany Uli von Aswegen
VU7T 2017-10-17 80m CW MK60hn Lakshadweep Islands Kavaratti Island DXpedition 2017
3C0L 2017-10-15 17m CW JI28tn Annobon Island Yuris (YL2GM) and Kaspars (YL3AIW)  
VU7T 2017-10-14 17m CW MK60hn Lakshadweep Islands Kavaratti Island DXpedition 2017
JA9CHI 2017-10-14 30m FT8 PM86 Japan Kazuo Kawai
IZ4BKI 2017-10-14 30m FT8 JN64 Italy Luca Lazzaro
RV9DD 2017-10-14 30m FT8 MO06 Russia Sergey M. Vertinskiy
VU7T 2017-10-13 40m SSB MK60hn Lakshadweep Islands Kavaratti Island DXpedition 2017
VK9CI 2017-10-13 40m CW NH87kt Cocos-Keeling Island South Pacific Contest Club (SPCC)
VU7T 2017-10-13 20m CW MK60hn Lakshadweep Islands Kavaratti Island DXpedition 2017
S21ZDC 2017-10-13 40m CW NL54aa Bangladesh
VU7T 2017-10-12 40m CW MK60hn Lakshadweep Islands Kavaratti Island DXpedition 2017

Book Totals: 13516 qso's   2903 confirmed


c
United States Counties Award#1848
Granted: 2016-07-19 23:32:02   (EU1KY)

Endorsements:
  • 100 Counties Mixed
DX World Award#2162
Granted: 2015-06-17 20:30:02   (EU1KY)

Endorsements:
  • 17 Meters Mixed
  • 20 Meters Mixed
  • Mixed CW
  • Mixed Phone
World Continents Award#1986
Granted: 2015-02-02 16:08:43   (EU1KY)

Endorsements:
  • 10 Meters Digital
  • 15 Meters Digital
  • 17 Meters Digital
  • 20 Meters Digital
  • 5 Band Mixed
  • 10 Meters Mixed
    12 Meters Mixed
    15 Meters Mixed
    17 Meters Mixed
    20 Meters Mixed
    30 Meters Mixed
    40 Meters Mixed
    80 Meters Mixed
  • 10 Meters Phone
  • 15 Meters Phone
  • 17 Meters Phone
  • 20 Meters Phone
  • 5 Band CW
  • 12 Meters CW
    15 Meters CW
    17 Meters CW
    20 Meters CW
    30 Meters CW
Grid Squared Award#1806
Granted: 2015-02-02 16:08:37   (EU1KY)

Endorsements:
  • 15 Meters Mixed
  • 17 Meters Mixed
  • 20 Meters Mixed
  • 17 Meters Digital
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