[BC] Signal Strength Question

[Broadcast List USER]

I have yet to build a tall tower in the Miami area, but I dare say the  
soils are sand there just like the Keys.  Towers in Miami are NOT  
going to have foundations in bedrock.

Sand has good stiction for caissons.  A 900 foot tower may need 35 to  
50 foot caissons.  It is hard scale as it is not linear, but a 2000  
foot tower in Miami or the Keys won't be much different, and the  
caissons will not possibly be more than 80 feet deep.  Not a hard  
drill for six or nine holes, and, of course, the inner anchors won't  
be nearly as deep.  I have built tall towers in sand, and I was  
surprised at how easy the foundations were.  Stiction, baby.

Building a full C in Key West would be interesting, 100 kW at (about)  
2000 feet.  Of course, it would never pay, but covering a lot of Cuba,  
some of Mexico coast, and much of the gulf states, though not far  
inland would be interesting.  Being the most listened to station on  
the oil rigs would be funny.

No money, but more square miles than anywhere in the world.

Like I have always said; "Join the Navy; see the world.  It is mostly  
water."

--chip

On Nov 24, 2010, at 12:50 AM, broadcast-request at radiolists.net wrote:

> Message: 30
> From: Mike McCarthy <towers at mre.com>
>
>  I thought there was an AM aimed right at Key West with a 4 tower
> in-line array just NE of the island/NAS. Or is that Radio MARTI or a
> military array?
>
> Miami has several 1800ft. towers designed for hurricanes. The majority
> of them have dual guying systems..built after Andrew.  Dual guying is
> where there are two complete sets of guys and anchorages, any
> combination of which is sufficient to hold the tower at rated wind.
>
> Given the Keys are mostly sand with not a LOT of good rock/stable  
> soil,
> I'm not sure anything taller than 350ft. is prudent short of DEEP
> embedding, an extremely robust guying system, and balanced load to
> minimize torsion in gusts.
>
> MM