[Moon-net] cable losses ?
Jurgen van de Glind
pe1lwt at xs4all.nl
Sun May 18 12:46:42 CDT 2008
Hi Lunatic,
Just after finishing our new eme arrays ( PA3FPQ/PE1LWT) we ran into a cable
loss question we can't figure out properly.
We nearly have the same setup; FPQ: 4x 9elxpol in +config , LWT 4x9el in X
config
FPQ is having a 4-port divider in the centre of the frame and uses 4x 5m
length as phase line total use of cable =20m
LWT is having coax dividers and is combining the 2 left antennas with a T
junction,the 2 right antennas with a T junction these 2 t junctions are
connected together with n(odd)* 1/4λ lines tog et 50ohm again. Total use of
cable = 15m ( in fact this way the 4 port divider of coax is having longer
legs)
For both systems we have run from each antenna the same length of cable to
the preamp. But the total amount of cable in the system is 5M less in LWT
system. So our simple way of thinking will say LESS cable is LESS losses. Is
this true ?? anyway it's cheaper :-)
Jurgen PE1LWT
4x 9elCM xpol Xconfig
Linrad/Map65
More information about the Moon-net
mailing list