Grupa: Administrator 
Lokalizacja:: Kłodzko JO80IK
Posty: 39524 #2607106
Od: 2013-10-18
Ilość edycji wpisu: 2 | HB9Q with LFA Yagis make EME possible to small antenna stations
TYLKO ZAREJESTROWANI I ZALOGOWANI UŻYTKOWNICY WIDZĄ LINKI » DARMOWA REJESTRACJA
Courtesy SARN
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Life above 50,000 MHz
73! Stanisław Kłodzko JO80IK
IC-7300 + IC-9700 + (2m - 9el + 250W),
(70cm - 21 el + 250W), (23cm - 55 el + 150W)
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Grupa: Administrator
Lokalizacja:: Kłodzko JO80IK
Posty: 39524 #2607112
Od: 2013-10-18
| A close-up shot of the 2 x 2el 144MHz 4 element LFA Yagis installed at HB9Q before the 70cms X-pol was added
The X-pol 70cms LFA Yagi with 7 elements in the same plane. Close loop feed system that is completed grounded one side, helsp reduce noise and keep the RX/TX safe from static when runnign QRO
Both 2m and 70cms LFAs can se seen pointed to the dish in this shot. Note the rotation of the 70cms LFA. Due to the third harmonic relationship between 2m and 70cms, the 2m elements would conduct while 70cms was in use and distort the pattern of the 70cms LFA and reduce performance. Rotating out of the same plane, reduces drastically the chances of this happening
Source G0KSC
_________________
Life above 50,000 MHz
73! Stanisław Kłodzko JO80IK
IC-7300 + IC-9700 + (2m - 9el + 250W),
(70cm - 21 el + 250W), (23cm - 55 el + 150W)
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