[TowerTalk] Tower location and house noise

[Chuck Dietz]

Definitely the back of the lot. More than just cutting down noise, it will
help prevent RF getting into computers.

Chuck W5PR

On Tue, May 23, 2017 at 11:04 AM, <howardbochs at gmail.com> wrote:

> I have uploaded a short video of my backyard and am going to try to do the
> HFTA analysis this afternoon.  I am getting more and more inclined to
> install my tower in the very back of my property.  It’ll be interesting to
> see what the terrain analysis comes up with!
>
> Thanks, here’s the video if anybody cares to view it, although I don’t
> think it’d be too much help.  It’s in HD, so adjust youtube accordingly!
>
> https://youtu.be/6LU1qh97BFg
>
> Howard, W1HBO
>
>
>
> From: Grant Saviers
> Sent: Tuesday, May 23, 2017 11:07 AM
> To: Howard Ochs
> Subject: Re: [TowerTalk] Tower location and house noise
>
> Howard,
>
> I think you might benefit from HFTA terrain analysis, CD in the ARRL
> antenna book.  You can get the custom DEM file for your specific lat-lon
> from Stu K6TU at K6TU.net.  A terrific free service from Stu since the
> gov't instructions are usually gibberish.
>
> You don't mention the azimuth of the terrain fall off, but locating the
> tower close to it will increase the effective height of the antenna in
> that direction.  With a 55' tower this can make a significant difference
> in performance.  So you might try an HFTA L-L close to the shack and one
> near the fall off.  Off course if the fall off is in a useless direction
> then there is little benefit. The location choice is dependent on your
> operating goals and the most difficult azimuth to achieve those QSOs.
> For fine grain location choices you will need a good GPS or google map
> to get the L-Ls to enough significant digits.
>
> As a strategy you should be able to fix/control all noises sources in
> your home/shack.  It's the ones you can't control to maximize their
> distances to the tower.
>
> Trees don't affect HF very much until 10m and higher.  Significantly at
> 2m and up.
>
> With a 150' run to the tower, investing in upgraded coax is a good idea,
> LMR600 or LDF4-50 or best would be AVA5-50/LDF5-50 7/8" hardline.  With
> a crank up, you can't do much better than Buryflex for the run up the
> tower and the rotator loop.  So you might end up with more than 225' of
> coax, so calculate the loss for each band and think about how much lower
> coax loss costs vs the rest of the investment per db gained with the
> tower and beams.
>
> Hope this is helpful,
>
> Grant KZ1W
>
>
>
> On 5/23/2017 6:18 AM, Howard Ochs wrote:
> > Hi Fellas,
> >
> > I am soon to begin my installation of a tx-455 in my backyard and this
> > topic is making me re-think my own tower's location.  I thought I had my
> > chosen spot, which is the highest point in my backyard, and only 20' from
> > my shack.
> >
> > However, if I were to locate it to the very back of my property,
> > approximately 150' from my house, it'd be that much further from all my
> > sources of noise (homes, powerlines, etc.) since it's woods and finally,
> a
> > river.  In that placement, it'd be next to our small pond and next to a
> > fairly steep slope dropping down into the woods and river.  As well, at
> > this location, it would lose 20' in height and be near some fairly tall
> > trees, although not among them.
> >
> > What to do?  I may just take a video today, upload it and get some
> opinions
> > from those of you with much more experience!
> >
> > Howard, W1HBO
> > _______________________________________________
> >
> >
> >
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