[Lowfer] FW: The Wm's

[Paul Daulton]

Bill your comments on the Ashlock loop at HSA would be appreciated. 

When we installed it back in the summer best I remember it measured 
85uh and resonated with something like 8000pf. In the last two months 
as the vegetation subsided Dave has had to add caps to resonate the 
loop. Yesterday we drove up to his lake side home and checked the 
beacon, it needed 900pf more to resonate. He has a bank of caps and a 
three gang bc variable resonating the loop. We didnt have a cap meter 
with us but I think it now has over 10000pf. 

The loop is not touching any trees, is the change normal from summer to fall?

HSA puts in a good signal here at 50 miles just about 24 hrs a day but 
no out of state reports. 

Give us your ideas. 

Paul k5wms

Quoting Bill Ashlock <ashlockw at hotmail.com>:
>
> Hi again JB
>
> A simple way to determine the Rac of the antenna system is to assume 100%
> transmitter efficiency and measure the antenna current. Then use the power
> formula to calculate Rac. If you measure the Q of the loading coil on 
> the bench
> you can convert this value to Rac. Subtract that from the total 
> antenna Rac and
> you have the Rac of the antenna itself without loading coil. I would highly
> appreciate to seeing your value as our ground systems are quite different. 
>
> I just now remembered that the NYC broadcast antenna I mentioned had cages on
> all four elements (Right Dave R?). That would be easy for me to do up 
> here and
> would reduce the coil inductance required, hence reduce the Rac of 
> the coil, by
> at least 2x. Also might reduce the electric field reaching the ground even
> though that counterpoise would be about 20ft above ground, considering the
> height of the two support trees. Can't wait to try this!
>
> Bill
>
> > From: weazle at hurontel.on.ca
> > Date: Thu, 3 Nov 2011 09:50:45 -0400
> > To: lowfer at mailman.qth.net
> > Subject: Re: [Lowfer] FW:  The Wm's
> >
> > Hi Bill,
> >
> > The counterpoise wire is insulated and was just laid on the ground 
> when it was
> installed. 
> > Years have passed in that time, so it's well matted in with the 
> uncut grass in
> that part of
> > my property here.  Each end of the counterpoise is connected to the ground
> rods at the
> > base of the towers which support the antenna and it's also 
> connected into the
> grounding
> > at the feed point.  Buried parallel to the counterpoise and about a 
> foot below
> it is a 20
> > foot length of 0.5 inch copper pipe in the "black goo" soil there. 
> >
> > I've never measured the Rac since I've no equipment to do so.  I do 
> have a RF
> ammeter
> > (current xfmr) on the ground lead of the loading coil-variometer, but it's
> only relative and
> > I just kept on changing things to get the maximum reading.  The 
> final of the
> tx is coupled
> > to the bottom end of the loading coil-variometer through a three turn link
> coil for D.C. 
> > isolation and matching purposes. 
> >
> > Based on the reports and captures I've received, it appears to be 
> doing a fine
> job!
> >
> > 73, J.B., VE3EAR
> >
> > LowFER Beacon "EAR"
> > 188.830 kHz. QRSS30
> > EN93dr
> >
> >
> >
> >
> >
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Paul Daulton K5WMS
beacon WMS 185.302 khz qrss30/slow 24/7
Jacksonville,Ar 72076
em34wu