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.
CUTE1,7 cross yagi on RTL-SDR USB dongle
73! de LY3H
Hello, RG62 Velocity of Propagation is 83 %. Then, a loop length equal to 142 mm
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?
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?
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
Bill - WA4CYP
Harry - K7ZOV
Žilvinas - LY2SS
LY3H © 2018 | Epalete DAD