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

[Clive Whelan]

Thanks Pete and Bob. This confirms the other reports I have, so the 160m 
vertical variant at least is clear.


Thanks again.


73



Clive
GW3NJW

Pete Smith wrote:
> 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 
> 160.
>
> -- 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?
>>
>>
>> 73
>>
>>
>>
>> Clive
>> GW3NJW
>> _______________________________________________
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