I haven't built or used one, yet but I have often thought it might be a good idea to put a laser on one, kinda like pointing a weapon with a laser
GB & 73 K5OAI Sam Morgan On 12/21/2011 4:04 PM, W2PM wrote: > I have used one which the ARRL RF lab brought down here to address a very > serious problem. We were able to identify the BOLT on the insulators where > arcing was coming from, photograph it, attach both the audio file and the > spectral display unique to each offender and the power company still reneged. > Until FCC saw this and that was the end of the power company resistance. > Problem fixed. Those devices are not easy to aim however. You need a > steady hand and lots of patience. > > On Dec 21, 2011, at 4:10 PM, "John G3PQA"<g3...@onetel.com> wrote: > >>>>> On 12/18/2011 2:36 PM, Dave W5UN wrote: >>>>>> I'm looking for input from someone who has experienced a similar >>>>>> situation as I describe below. >>>>>> >>>>>> About 3 months ago I began experiencing severe noise on top band. >>>>>> It's a constant white noise which begins to drop off above 2.5 >>>>>> mHz, >> >>> On 12/20/2011 2:30 PM, David Raymond wrote: >>>> >>>> Jon. . .great advice, particularly about going to higher frequencies as >>>> you get closer to the noise source. We've spent considerable time >>>> chasing noise at our contest station. I addition to using RF we also >>>> use a high range audio device with a highly directional dish antenna >>>> which listens in the 20 - 40 KHz range. It is an excellent tool to >>>> have in the arsenal when you get in close (say, 100 yards or so). You >>>> can usually pinpoint the noise right down to the specific insulator, >>>> lightning arrestor, etc. In some cases it would be worth borrowing >>>> one. 73. .. Dave W0FLS >> >>> (Jon, AA1K): tnx info Dave ....where can those be had? >> >> >> For those who wish to build an ultrasonic detector (or in the absence of >> DX locate bats!) an article was published by ARRL in 2006 >> http://www.arrl.org/files/file/Technology/PLN/Ultrasonic_Pinpointer.pdf I >> have built a couple of this design using the Far Circuits pcb and they work >> well, needs a small parabolic dish and piezo electric detector at its focal >> point. Also I should mention that Jerry K4SAV has designed some >> improvements in sensistivity and mixing if needed. >> >> re. Dave's noise problem, it sounds bad , not the usual switchmode etc. >> we suffer on 160m.. Any progress Dave? >> >> 73 John G3PQA _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
