[CQ-Contest] SO2R Coax Stub location; outside?

[Jeff Blaine]

Mike,

Good you are getting that filtering added.  SO2r without filtering is a 
recipe for frying front ends.  Guess luck has been in your favor.

On the stub location, outside is fine.  In fact all my stubs have been 
located outside.  There is some magic as to the optimal place along the 
feedline to place stubs but I've never fine tuned to that point.  I load 
the stub at the base of the tower where the antenna stack matches are 
and they work fine.

73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com


On 2/22/20 3:52 PM, Mike Smith VE9AA wrote:
> Is it reasonable to assume I could locate all my coax stubs 165' away from
> the shack outside at the antenna switch?
>
>   
>
> Currently I run SO2R with no band pass filters, nor coax stubs, but I have a
> 'relatively' large lot (2.2ac) and "radio 2" has a single antenna
> (horizontal ZS6BKW) located at the opposite end of the lot and the primary
> "radio 1" has a variety of verticals or vertical arrays, so it works.
>
>   
>
> Sometimes that's an advantage (speed of QSY's; not ever having to worry
> about switching in stubs or filters) but sometimes there is a very small
> amount of crossband QRM (self inflicted) and it always prevents running on 2
> bands with my 'best' antennas.  For example, when I am running on 40m/80m I
> have to choose one 4-Sq and always the horizontal antenna is parked on
> "radio 2" (a ZS6BKW w/ 15m add-on element).
>
>   
>
> If I bought 2 sets of bandpass filters and made up 6 coax stubs that I could
> locate out at the antenna switch, I think it would be a small step up for my
> signal on some band combos.  The relatively low ZS6' ain't exactly a pileup
> buster ;-)
>
>   
>
> Reason is, there is NO ROOM in the shack for stubs.  Just none.
>
>   
>
> So, any downside to doing it this way?
>
>   
>
> Mike VE9AA "NB"
>
>   
>
> Mike, Coreen & Corey
>
> Keswick Ridge, NB
>
>   
>
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