Amateur radio station since 1993
RA3WDK 's HOMEBREW ANTENNAS LINK
FiveBander 14-18-21-24-28 MHz
Coil-Shortened Dipole Antenna for 30m over 5 Band Yagi
5 Band Yagi
Experimental Tri Band yagi for 14/21/28 MHz Bands
OptiYagi Tubes+Wire TriBander 14/21/28 (3 el for 28 MHz)
New antenna (Jule 2016) FiveBander 14-18-21-24-28 MHz
Test Five-Bander (20m 17m 15m 12m 10m) for 7m on the ground
First QSO`s on 17 m : JA4DNC,VO1MP, MI6GTY, J68HZ ....
" If you want a thing well done, do it yourself " .... Doing RF switch !
Antenna switch with antenna selection for each RX / TX operation mode
The Lighting Protection for Rotors
My Yagi Antenna Construction with Elevation for EME
You can use very easy Manual Rotator Control for Azimut or Elevation for DC motor
In my new QTH (2004 year) i made very simple and very cheap antenna (for joke has been spend 2 $ for making antenna) for 2 Band -144+432 MHz
You can download antFM.zip : contructions , SWR , MMANA file model. Many Ham use this antenna in Russia and Ukraine with good result for local and Tropo QSO . Easy constructions and good gain : 2,8 dbd in 2 meter band and 5,2 dbd in 70 cm band. I used this antenna for SAT QSO via VO52 with good result .
UB9MAR Alexander has sent me photo his realisation of this antenna and Hams from 22dx.ru forum
UR7HJR made 4xDipole antennas with simply impedance matching (look RADIO 03/2009)
Dual band FeedHorn for 1296 and 5760 MHz
Ham`s who work on SHF band from field condition or with small setup know many reason to have a multiband antenna system. Dish is very effective antennas for 23 cm band and above. Many Ham`s use one dish for some bands by change feed horn or antenna module. For example i also use two changing modules of 6 and 3 cm band for small offset TV SAT dish .
DL4EMA Guenter made loop feed of 23 cm band for prime focuse dish and RA3AQ Dmitrij  made some different design of loop and diameter of reflector.
1. Parabolic Dish Ring Feed (1998) DL4MEA http://www.qsl.net/dl4mea/ringfeed.htm
The main advantage of a loop feed is very simple mechanical
configuration and good performance of antenna system for Field days
and QSO by TROPO propogation.
Measured radiation pattern
Victor UA9YLU made this Dual Band Horn for his Dish SVEC 1,8 m . He got ratio Noise from Sun / Cold Sky - 7 db for 1296 MHz and 4,5 db for 5760 MHz
Vladimir R3GC made this Dual Horn. He used saucepan for reflector of element 1296 MHz.
Alexander UA3OW made this Dual Band Horn.
Horn for 10 GHz with angle of 110 degrees for illuminating Dish F/D 0,35-0,5
Description of S11 for horn with angle of 110 degrees:
Feed horn 10368 MHz , SWR <1.1
Other Horn for best illuminate offset dish (80 degr) , aperture size 45x30mm , waveguide size 23x10mm
Horn 5760 Mhz for offset dish (80-85 degr.) , click for full size image
Dual Mode Horn 5,7 GHz optimise for 75 degr. offset TVS Dish and Horn for 80 degr offset TVS Dish
click for full size image
Measured radiation pattern Horn for 80degr offset TVS Dish
Dual Mode Horn 24 GHz optimise for 85 degr. offset TVS Dish
Compromise Short Horn 5760 MHz for 85 degr. offset TVS Dish
Measured radiation pattern of Compromise Short Horn for offset TVS Dish
Modification horn for TV SAT dish in 10368 MHz band
Increase in internal diameter to 20 mm !!!
"Cold" horn for measurement Noise factor of LNA on 5,7 Ghz and 10 Ghz
Multi Mode Horn with Bi- Orthogonal polarization for Offset dish, 5,1-5,6 GHz for Wi-Fi.
You can download simple calculator for Dish CalcDish.xls (russian)
OK1TEH Matej translated to Calcdish_en.xls
My proect micro yagi in sungle boom for 432 MHz and 1296 MHz band ("LazyYagi")