Mike, The pvc standoff you have for the repeater antenna is mounted horizontally and the wind would have to blow just right in order for it to make any sound. I think the wind needs to blow across the opening close to 90 deg to create the sound. If you mounted the 2 in pipe vertically then I bet it is you culprit because the wind can blow from any direction and still blow across the opening to make the sound.
As for the SDR-IQ, I bet that is a sweet radio. I have been thinking about a 160m sloper or inverted v off of my tower at the house. I put up a 160m delta loop before winter but I have not been overly impressed with it. 73's LaRoy McCann, N5OHO Data Technology Mike wrote: > LaRoy: > > (and others) Thanks for your analysis and feedback. The more I look, > listen and observe, the more I believe you guys have found the melodic > culprit. > > When I put up the amateur antenna, a new backhaul was put up during the same > time period. I built that mount with a 2 inch piece of galvanized pipe. > So, I am counting open ends of open pipes and the math adds up to a four > part melody. The next trip up the tower will see duty capping all ends of > all open pipes. I just hope the sound doesn't affect growth of my asparagus > or morel mushrooms in the meantime. LOL > > For you amateur radio operators and armchair SWLers, that 900 foot long wire > (actually an inverted Vee) with the apex at 160 feet, coupled to one of > these http://rfspace.com/RFSPACE/SDR-IQ.html is beyond compare! The NDB > band is a solid band of colors. Even LW signals from Europe come pounding > in regularly. > > Friendly Regards, > > Mike > > Mike Gilchrist > Disruptive Technologist > Advanced Wireless Express > P.O. Box 255 > Toledo, IA 52342 > 239.770.6203 > m...@aweiowa.com > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Data Technology > Sent: Monday, April 05, 2010 11:04 AM > To: WISPA General List > Subject: Re: [WISPA] Pan flutes on the tower > > I bet if you cap the ends it will quit whistling. > I have the same problem on one of my towers. I have a 1.5" dia pipe as > a standoff and it will make sounds when the wind blows. > I was up there on a windy day once and I could put my hand over the top > of the pipe and it would quit whistling. > > LaRoy McCann > Data Technology > > Mike wrote: > >> 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: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> >> >> > > > > ---------------------------------------------------------------------------- > ---- > WISPA Wants You! 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