[TowerTalk] Shunt fed tower verticals- risks in SO2R?

Pete Smith n4zr at contesting.com
Wed Dec 26 16:26:45 EST 2007

In practice, I have not experienced this problem.  A few caveats, though:

--  my shunt feed is on 160, and my top-most yagi is for 40 meters.  That 
combination is fairly rare but not unheard of here.

-- I run bandpass filters on both radios, and only run 200 watts maximum on 

-- I run a simple RX protector in the receiving antenna loop on each 
transceiver, which uses a small pilot lamp as an indicator of RF (in or out 
of band) as well as a fuse.  I have never seen it light when both bandpass 
filters are in the circuit, on any band combination.

73, Pete N4ZR

At 02:26 PM 12/26/2007, Clive Whelan wrote:
>Well actually let's say any kind of tower vertical .
>I'm conscious of the fact that when feeding a tower as a vertical in
>SO2R configuration, that the Yagi atop the tower looks very much like a
>high voltage point and can potentially feed back to the HF transceiver
>causing front end receiver damage.
>However, I am not aware that this is a problem in practice, and indeed
>two UK users report no problems when running a shunt fed tower on 160m,
>whilst simultaneously listening on HF on another receiver connected to
>the yagi. I would nevertheless be in interested to hear from users here
>with practical experience thereof. Should I be concerned?
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>TowerTalk at contesting.com

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