Re: Topband: Topband Tower Antenna With Two meter Vertical

["Price Smith" <w0rihps@sbcglobal.net>]

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

_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK