It took a few minutes to get my recording stuff together. I was going to make a digital recording of the sound to embed here; the wind is up. Guess what? No sound! The wind is NOW coming from the SE (it's warming up!) and straight into the pvc pipe. If it is the pipe, then it must take a "cross wind" to generate the tone.
I hadn't thought about the bottom of the antenna. The sleeve which covers the N connector IS over an inch in diameter. I guess the next trip up the tower will include jamming some plumbers putty into all open pipes! LOL I am glad to be able to provide a little entertainment this Saturday morning. Mike -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of AJ Sent: Saturday, April 03, 2010 10:23 AM To: WISPA General List Subject: Re: [WISPA] Pan flutes on the tower Try a second member in the center to properly brace it completely vertically, wrap all of the pot metal joints with eletrical tape and hope it disappears LOL... Also look at the bottom of the antenna mount where the coax comes out - this is roughly 3 times the size of the coax cable that is bouncing around there.. On Sat, Apr 3, 2010 at 9:19 AM, Mike <[email protected]> wrote: > Wind through that short piece of pvc was my first suspect. But, Bernouli > effect asside, wouldn't a single "pan flute" create a single tone? There > are 4 distinct tones! It really does play this eerie melody. > > Mike > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Brian Webster > Sent: Saturday, April 03, 2010 10:11 AM > To: 'WISPA General List' > Subject: Re: [WISPA] Pan flutes on the tower > > When I ran a tower construction company, the crews used to tape over the > ends of pipes when they were on top of the truck going to a job site. They > said the noise from the wind blowing through them would drive them crazy > while going down the road... > > > > Brian > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of Mike > Sent: Saturday, April 03, 2010 9:52 AM > To: 'WISPA General List' > Subject: [WISPA] Pan flutes on the tower > > A while back, the amateur community talked me into putting a ham antenna on > my highest tower. It is a dual band 2 meter 70 cm DC grounded unit (as per > my specs). I built a mount which offsets the stick a couple feet from the > tower. A piece of 1 inch PVC through which I passed a piece of poly rope > is > attached with stainless hose clamps near the top of the stick to lasso the > 17 foot stick to keep it from swaying. > > > > A couple times this winter when I was outside, I heard this eerie melodic 4 > part tone. It sounded like someone blowing across Pan flutes. Now that > spring has sprung, every time the wind blows, there is this tune again. > While I questioned my sanity this winter, I do think it is coming from the > amateur antenna. > > > > Although the sound is somewhat melodic and not objectionable, I fear this > summer with windows open in the house, it will keep me up at night. I have > this fear it will be like when I first put that tower up and put a 10 foot > by 20 foot flag at the top to raise awareness in the community. It snapped > so loud it would wake you from a sound sleep. One of my best nights was > when that flag finally came down. > > > > Since everything was done per my requests, and I want to maintain my stead > with the amateur community, how does one keep that stick from making those > noises? I am hoping someone here has encountered something similar and has > a resolve. > > > > Regards, > > > > Mike > > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > ---------------------------------------------------------------------------- > ---- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! 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