Topband: Topband Tower Antenna With Two meter Vertical

[Wayne Rogers]

Thanks to all that have responded.  My concerns have been lessened and I 
appreciate that.

My tower is 200 feet from the house.  I already have 7/8"  hardline run up 
the tower (Rohn 25, run outisde).  I'm not sure how successful I would be 
trying to run it inside - the tower is small and the hardline tough to work 
with.  I have a substantial grounding system around the house and all my 
coax from the tower is connected through surge arrestors and tied to a 
common ground at the entry point.  I am comfortable with this.

Thanks all that responded.  I am currently waiting delivery of a side mount. 
I'll advise the results when all is up and running.

73, Wayne

--------------------------------------------------
From: "Price Smith" <w0rihps at sbcglobal.net>
Sent: Sunday, April 15, 2012 12:11 PM
To: "'Wayne Rogers'" <n1wr at chesapeake.net>; "'topband'" 
<topband at contesting.com>
Subject: RE: Topband: Topband Tower Antenna With Two meter Vertical

> Sent: Sunday, April 15, 2012 10:49 AM
> To: topband
> Subject: Topband: Topband Tower Antenna With Two meter Vertical
>
> Maybe a bit off topic, but I'm hoping someone can give me some insight.
>
> I use my 90' tower as a vertical on topband.  It's base is grounded, and I
> feed it with a gamma match.  Works great.  OK so far.
>
> I want to put a two meter vertical on the tower which will be used for 
> ARES
> (packet, continuous 24/7 connected up to the two meter radio.
>
> My concern is protecting the two meter radio when I'm transmitting 1500
> watts into the tower on 160 meters.  Would like to hear from anyone who is
> doing this - will a simple high pass filter at the input to the two meter
> radio suffice to protect the radio from 160 meter RF?
>
> Also - on the antenna installation.  Typically the two meter vertical's
> outer conductor will be grounded to the tower at the base of the two meter
> antenna.  I could also keep the two meter antenna insulted from the tower
> for its entire length up to the lightning protector just before it enters
> the house.  What's the recommended practice?  Ideas?
>
> Thanks, Wayne N1WR  (160 op and also AEC Calvert Co. MD)
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
>
> Wayne,
>
> I have 80ft of Rohn 45 tower with a 5el 20 meter beam at 81ft, 3el 15 at
> 90ft and 3el 10 at 100ft. I have a Diamond X200 on a side arm at 70ft. I
> shunt feed
> The tower with an Omega match. All the coaxes come to the ground. They go
> underground for  5ft to a box with PolyPhaser arrestors. Then they go into
> the
> House to my equipment. I put 10 snap-on ferrite cores on the 2meter coax 
> in
> the house. I have no inter action even when running QRO on 160 meters. 
> The
> Coaxes are NOT connected to the tower except at the shunt feed.
>
> I hope this helps.
> 73 Price W0RI near St. Louis, MO