[Moon-net] cable losses ?

[g4igo]

Hi - I would also look to avoid any connector on the ants feeds  - I  feed 
my 2 times 6 eles on 50 MHZ direct with LDF 2-50 feeder - so 2 less 
connections - also into a power splitter.

Ken Osborne G4IGO
----- Original Message ----- 
From: "Peter Voelpel" <df3kv at t-online.de>
To: "'Moonnet'" <moon-net at list-serv.davidv.net>
Sent: Sunday, May 18, 2008 6:32 PM
Subject: Re: [Moon-net] cable losses ?


> Hi Jurgen,
>
> It will depend on the kind of cable used.
> 5m difference with 7/8" Cellflex is 0.0735db and 0.133 with 1/2" Cellflex,
> but would be 0.45db by using RG213.
> I guess the more important difference will be in the amount of
> interconnections.
> Probably I would go for a 4-port divider in the centre using a total of 
> only
> 5 connectors and the feedline as large as mechanically as possible.
> With that layout, even by using 5 more meters of feedline, my total inter
> connection loss will be less then with the 9 connectors in the LWT system.
>
> 73
> Peter
>
> -----Original Message-----
> From: moon-net-bounces at list-serv.davidv.net
> [mailto:moon-net-bounces at list-serv.davidv.net] On Behalf Of Jurgen van de
> Glind
> Sent: Sonntag, 18. Mai 2008 19:47
> To: moon-net at list-serv.davidv.net
> Subject: [Moon-net] cable losses ?
>
>
> 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
>
>
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