Ah, it never occurred to me that your ground level was that much
different from the NAS. Yes indeed, unless you want a negative tower
height you'll need to move some paper. On the other hand, unless you
are at the very highest point around, perhaps you're already shaded, and
that may help get approval. Good luck!
73, Pete N4ZR
The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at
reversebeacon.blogspot.com
On 4/3/2010 11:53 AM, Dick Dievendorff wrote:
> There's a 20-foot threshold, so at 7 meters the tool must have started
> looking at the other numbers. I think the main difficulty is that the ground
> level at my site is 251 feet and the ground level at the runway is about 16
> feet, and that affects the calculation probably more than the proposed tower
> height. TOWAIR doesn't claim to be all that accurate; there are caveats all
> over the tool. But it didn't have any trouble calculating my horizontal
> distance from NAS Whidbey, and because of the heights I'm in the area, I'm
> going to need to apply.
>
> I've already applied to the FAA for the highest planned tower. Hopefully
> they'll consider the tree height all around and be happy that I'm not
> proposing to go up much above the tree cover. Being on a high bank
> waterfront makes for lower (and cheaper) towers. N6BV's HFTA is a great
> tool to understand how this works.
>
> It appears that I might have to make separate applications for the HyTower
> and even the 50 foot push-up mast I have lying around. Once the main tower
> is permitted, I hope the others will go more quickly and at some point
> they'll ask me to stop applying.
>
> We do have low flying aircraft over the property often, so common sense
> suggests that anything that sticks up above the tree cover be evaluated as a
> possible new hazard.
>
> I haven't been there long enough to get tired of the aircraft noise yet,
> although some of the locals are. It's still cool when a P-3 or EA-6B flies
> by low enough to see the pilot. My Dad was career Navy; I spent some time on
> three different aircraft carriers in my service years in the Navy, and
> whenever I have a chance to see the Blue Angels, I go. I'm told that they
> will be phasing in a new F-18 variant for the ECM mission, so we'll see (and
> hear, and feel) fewer EA-6Bs and more F-18's in the future. Cool!
>
> Dick, K6KR
>
>
> -----Original Message-----
> From: towertalk-bounces@contesting.com
> [mailto:towertalk-bounces@contesting.com] On Behalf Of Pete Smith
> Sent: Saturday, April 03, 2010 4:06 AM
> To: Tower and HF antenna construction topics.
> Subject: Re: [TowerTalk] TOWAIR query - proximity to airport, FCC and FAA
> registration
>
> This sure suggests a computational error in the TOWAIR routine - like
> when you do a model in HFTA and a 1-meter change in antenna height
> produces a big change in pattern. I think the first thing I'd do is a
> manual computation based on a topo map. Measure the distance from the
> nearest border of the airport (for a conservative calculation), your
> site's altitude, and apply the algorithm given in the FCC reg.
>
> 73, Pete N4ZR
>
> The World Contest Station Database, updated daily at www.conteststations.com
> The Reverse Beacon Network at http://reversebeacon.net, blog at
> reversebeacon.blogspot.com
>
>
> On 4/2/2010 6:26 PM, Dick Dievendorff wrote:
>
>> At 6 meters of tower height, I don't need to register. At 7 meters of
>>
> tower
>
>> I'm suddenly 22 meters too high for the distance from Whidbey NAS.
>>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|