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Re: [TowerTalk] Budget 4-Pack?

To: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Subject: Re: [TowerTalk] Budget 4-Pack?
From: Jim Rhodes K0XU <k0xu@longlines.com>
Reply-to: "Tower and HF antenna construction topics." <towertalk@contesting.com>
Date: Tue, 02 Mar 2010 17:14:36 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
I built a box with 2 SPST relays per antenna and switched them with 
SPDT  center off switches, one per antenna. That way each antenna can 
only be switched to 1 rig at a time (unless a relay sticks) however 
more than 1 antenna can be active to each rig.  Now my problem is 
that there is no way to switch antennas over an internet 
connection.  I am away from home right now, but if you need a 
schematic I could probably draw something up & scan it at 
home.  Didn't use a schematic to build, too simple. BTW, the relays 
were  cheap DPDT relays from our favorite Shack with a short soldered 
across the common contacts to increase isolation. With no filters or 
stubs I can run 100 watts on each rig and not cause any problems 
except right close to exact harmonics. And sometimes it is nice to 
run both the TH5 and the HyTower on the same rig at the same time.

If you wanted to go REAL cheap you could just use the SPDT center off 
switches to directly switch the antennas. Don't know how that would 
work on the higher bands, but hey, give it a try.


>On Mar 1, 2010, at 1:40 PM, "Barry Fox" <foxbw@comcast.net> wrote:
>
> > I have two HF radios and 4 different HF antennas.  I would like to use
> > each rig on any antenna, while obviously locking out that antenna for
> > the other rig.  The commercial products 6-Pack, 8-Pack, etc are way
> > over my budget.  Anyone have a schematic for a "4-Pack" or similar
> > device they would like to share?  Obviously relays are the way to
> > go, and I can get the RF relay switching part of it on paper but
> > not the lockout logic.  Some sort of electro-mechanical exclusive-OR
> > gate array / diode matrix?  Anyone been there and done that?
> > TNX / 73,
> > Barry - W1HFN
> >
> >
> > _______________________________________________
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Jim Rhodes
jim@rhodesend.net

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