[TowerTalk] HIGH SWR because of loops between amp and wattimeter

[Jorge Diez - CX6VM]

Hola David,

Bueno, es una antena que tiene 6 meses de montada, es una 20M5 con el balún
de la M2, o sea que se supone que es bueno.

Tengo también la 15M6 con un balun similar y sin problemas.

73,
Jorge
CX6VM

-----Mensaje original-----
De: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] En nombre de David J. Sourdis -
HK1A
Enviado el: Domingo, 25 de Abril de 2010 03:56 p.m.
Para: towertalk at contesting.com
Asunto: Re: [TowerTalk] HIGH SWR because of loops between amp and wattimeter


Me parece que tienes el cable coaxial acoplándose a la antena y al variar la
longitud cambia la sintonía. Tienes un buen choke o balún? 

David  
HK1A
EC5KXA
ex-HK1KXA




> From: cx6vm.jorge at adinet.com.uy
> To: towertalk at contesting.com
> Date: Sat, 24 Apr 2010 20:44:09 -0300
> Subject: [TowerTalk] HIGH SWR because of loops between amp and wattimeter
> 
> Hello,
> 
>  
> 
> Today I was reading high SWR in my 20 mts yagi.
> 
>  
> 
> 2.5:1 in 14020
> 
> 1.9:1 in 14200
> 
> 1.7:1 in 14300
> 
>  
> 
> I have the radio connected to the amp, to the wattmeter and to WX0B
> six-pack. In all this runs I have small pieces of 50 ohms coaxial.
> 
>  
> 
> I connected the 20 mts yagi antenna direct to the K3 and the readings in
the
> radio were:
> 
>  
> 
> 1.4:1 in 14020
> 
> 1.0:1 in 14200
> 
> 1.0:1 in 14300
> 
>  
> 
> I know will be some variation when you go through all the runs from radio
to
> amp, wattmeter and antennas switch, but not too high that happens in 20
mts.
> 
>  
> 
> I tested all the other bands and SWR is lower when the antenna is
connected
> directly, but not too much difference, for example:
> 
>  
> 
> SWR in the
> 
> Main setup
> 
> (amp, wattmeter,           SWR with antenna
> 
> Frequency          Antenna switch)              direct to the K3
> 
>  
> 
> 28030                    1.5:1                                     1.2:1
> 
> 28500                    1.1:1                                     1.0:1
> 
> 21020                    1.5:1                                     1.3:1
> 
> 21200                    1.2:1                                     1.0:1
> 
> 21300                    1.1:1                                     1.0:1
> 
>  
> 
> 14020              2.5:1                           1.4:1
> 
> 14200              1.9:1                           1.0:1
> 
> 14300              1.7:1                           1.0:1
> 
>  
> 
> 7010                      1.3:1                                     1.0:1
> 
> 7050                      1.7:1                                     1.3:1
> 
> 7100                      2.0:1                                     1.5:1
> 
> 3505                      1.5:1                                     1.5:1
> 
> 3550                      1.2:1                                     1.2:1
> 
> 3600                      2.5:1                                     2.5:1
> 
> 1810                      1.2:1                                     1.1:1
> 
> 1830                      1.7:1                                     1.6:1
> 
> 1850                      2.3:1                                     2.3:1
> 
>  
> 
> So SWR is reasonable higher when connected through the amp, wattmeter and
> antenna switch in all bands, except in 20 mts that there´s a big
> diference!...
> 
>  
> 
> Is not a problem of the sixpack. I connected the 20 mts antenna with the
> same runs of coaxial with a 2 position Daiwa switch and have the same SWR
> that it have when connected to the sixpack.
> 
>  
> 
> Any idea how can I lower the SWR in the 20 mts antenna when connected to
the
> antenna switch?
> 
>  
> 
> Thanks,
> 
> Jorge
> 
> CX6VM
> 
>  
> 
> _______________________________________________
> 
> 
> 
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