UHF 9v + 9h handheld cross YAGI for satellite 436,5 MHz center. Required 113 mm length of 100 Ohm coaxial cable transform to 50 Ohm.
Antenna is working very well.
Sample:
CUTE1,7 cross yagi on RTL-SDR USB dongle
http://ly3h.epalete.com/wp-content/uploads/2013/01/CUTE17-cross-yagi-SDR.mp3
73! de LY3H
9 responses to “UHF 9v + 9h handheld cross YAGI for satellite”
Hello Paulius,
do you think I can use aluminum boom with elements mounted on isolated supports?
Thank you and best 73
Alfredo IZ7BOJ
Hello, RG62 Velocity of Propagation is 83 %. Then, a loop length equal to 142 mm
Paulius
LY2R
Hi,
I’m looking to construct a cross-yagi like the one pictured. I am in Canada – it has now become especially difficult to find 3.2mm aluminium. How do the element lengths change if using 6.25mm aluminium instead?
Hello, I am sorry, but the thickness influence lengths.
Steve, i used RG62 cable.
According to the coax transformer matching calculations, to match a coax of 50ohms to a system (antenna) of 100ohms, you need a piece of coax which is ~70ohms, is this correct? What coax is available at 100ohms?
Žilvinas, you mention to use a piece of RG58C/U but this coax is 50ohms, not 100ohms. Can you clarify?
Hello there,
Thank you for providing your design. It is very nice and interesting. Could you please explain about it’s impedance matching to 50ohm? Did you measure the SWR or S11 of the antenna?
Cheers,
Hooman
Hello,
finaly antenna is ~50 Ohm. SWR ~1.1 on 436,5 Mhz
Separated vertical and horizontal antenna impedance is 100 ohms, but once connected to one is ~ 50 ohm impedance. I hope this will help you
73!
Žilvinas