We measured what was coming down the feedline and using the receiver specs,
calculated how much attenuation would be needed on each band to keep the
level acceptable to the radio - I recall the numbers were between 45 and mid
70s in db depending on the TX/RX combination being calculated.
Then we worked out combinations of bandpass filters and stubs until we got
maybe 10 db more than was needed in some cases. Don't ask me how we did
this, I am an appliance operator who picks my operating buddies wisely :) I
was responsible for working 200 guys an hour.
It was a good, practical exercise. It worked.
----- Original Message -----
Sent: Tuesday, June 05, 2007 4:25 PM
Subject: Re: [TowerTalk] Is anyone using the 3 feedline approach
> That is pretty incredible. What kind of filtering did you use?
> To: <firstname.lastname@example.org>
> Subject: Re: [TowerTalk] Is anyone using the 3 feedline approach on
> theC31XRfor SO2R?
> From: "Mark Beckwith"
> Date: Tue, 5 Jun 2007 10:09:37 -0500
> We used this antenna in this way Multi-Two with no problems at HP1XX in
> DX CW. However, we took rather extreme measures using combinations of
> custom stubs and bandpass filters.
> I would describe it as very doable, but not out of the box. I believe
> K6LA's contest station also uses this approach with great success.
> Mark, N5OT
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