Topband: Shunt Fed Tower-Need Parts

[bruce whitney]

Marc & Ed,
You will find that the SteppIR beam will dramatically effect the tuning of the shunt fed tower tower. I retract (home) all the elements before loading on 160M. That way there is consistent top loading for the tower from the antenna boom only. I have been running 1.5KW to a 160M (130 ft tall) shunt fed tower with a MonstIR this way for some time with no apparent consequences to the antenna. Only time will tell if this works out in the long run. I suspect it will be OK since the antenna boom is well connected to the mast and all the control cables are in very close proximity to the boom. In my case the control cables pass up through the center of the mast and only come out through the mast at the antenna. There is a 'DC ground' VHF antenna on top of the mast above the MonstIR.
73, Bruce W8RA


--- On Sun, 9/26/10, Marc Wullaert ON4MA <marc.wullaert3 at telenet.be> wrote:

> From: Marc Wullaert ON4MA <marc.wullaert3 at telenet.be>
> Subject: Re: Topband: Shunt Fed Tower-Need Parts
> To: "Edward Sylvester" <navydude1962 at yahoo.com>, "topband topband" <topband at contesting.com>
> Date: Sunday, September 26, 2010, 2:19 PM
> Ed,
> 
> I'm not shure but is it good to have a Steppir as
> toploading for 160m. What 
> about the high voltages
> on the steppir motors and controlbox when you shuntfeed the
> tower ?
> 
> Marc ON4MA
> 
> ----- Original Message ----- 
> From: "Edward Sylvester" <navydude1962 at yahoo.com>
> To: "topband topband" <topband at contesting.com>
> Sent: Saturday, September 25, 2010 10:13 PM
> Subject: Topband: Shunt Fed Tower-Need Parts
> 
> 
> 
> 
> 
> I have a 70' crank up, loaded with a Steppir and some other
> antennas. I 
> recently installed a sprinkler system and took the liberty
> of installing 
> radials everywhere.
> 
> Now I am ready for the next step. Does anybody make a shunt
> feed kit, which 
> I can simply install or do I have to do this from scratch?
> 
> Does anybody have one for sale? Want this for 160m.
> 
> 73,
> Ed NI6S
> 
> 
> 
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