On mine, the side arms are insulated at the bottom and the conduit screws directly into the Tee at the top. That makes the shield symmetric about ground at the vertical post.
-John =============== > the side loops are insulated at the top to prevent forming aa shorted > turn. It's a loop antenna that works on the magnetic field component of > the incoming wave, rather than the electric field, like a whip. So, if > you put a bunch of turns inside the loop of conduit, a complete loop of > conduit will be a shorted secondary. > > J. Forster >> The HP 117A antenna is a circular shielded loop, about 1 meter or 3' in >> diameter. I never bothered to measure it. It looks to be made out of >> roughly 1" OD aluminum electrical conduit components, a Tee at the top >> and >> a pull box at the bottom. There are three conduit sections, one a >> diameter >> that goes vertically from the bottom pull box to the top Tee. There are >> a >> pair of semicirllas, one on each side. The two side loop halved are >> insulated from the pull box as I remember. >> >> There is a picture in the 117A manual on the Agilent site, but no >> dimensions I saw. It is a crummy scan. The loop dimensions may be in a >> catalog of the period. >> >> It'd be fairly easy to replicate w/ a hand conduit bender, IMO. >> >> -John >> >> ==================== >> >> >> >> I never bothered >> >> >>> Hi Pete, I have a 14" diameter choke ring GPS L1 with a big spike on >>> the >>> top of it, on the peak of the roof :) >>> >>> That certainly gets some stares! >>> >>> As the HP antenna is VLF, is the Antenna Huge? >>> >>> I can't reliably get WWVB in Australia. >>> Lots of fading etcetera, or I'd be in there like a shot :) >>> >>> We do have a beer called VB hmmm.. >>> >>> --marki >>> >>> -----Original Message----- >>> From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] >>> On >>> Behalf Of Pete Lancashire >>> Sent: Friday, 26 July 2013 10:50 AM >>> To: Discussion of precise time and frequency measurement >>> Subject: Re: [time-nuts] Agilent / HP 117A on eBay... >>> >>> I still would like to find one of the HP antenna's just for the looks. >>> Even the 10509A with 13CW4's .. ok the FET version would be better. >>> >>> At least give those passing by something else to point at :-) >>> >>> -pete >>> >>> >>> >>> >>> On Thu, Jul 25, 2013 at 7:09 AM, Burt I. Weiner <b...@att.net> wrote: >>> >>>> I always wanted on, but with the intention of using it. To bad it's >>>> now useless now with the new WWVB format, otherwise I'd buy it. >>>> Antennas I got. >>>> >>>> Burt, K6OQK >>>> >>>> At 06:14 AM 7/25/2013, time-nuts-requ...@febo.com wrote >>>> >>>>> >> Would this box work with the new WWVB format? >>>>> >> >>>>> >> >>>>> >> On 07/25/2013 04:07 AM, Mark C. Stephens wrote: >>>>> >> >>>>> >>> Oh my gosh, a 117A has popped up on eBay! >>>>> >>> Looks in pretty good condition given its age... >>>>> >>> >>>>> >>> Seller claims the antenna will be listed shortly! >>>>> >>> >>>>> >>> Item # 281141315740 >>>>> >>> >>>>> >>> >>>>> >>> --marki >>>>> >>>> >>>> Burt I. Weiner Associates >>>> Broadcast Technical Services >>>> Glendale, California U.S.A. >>>> b...@att.net >>>> www.biwa.cc >>>> K6OQK >>>> ______________________________**_________________ >>>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>>> https://www.febo.com/cgi-bin/** >>>> mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listin >>>> fo/time-nuts> >>>> and follow the instructions there. >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > > > -- > "Neither the voice of authority nor the weight of reason and argument > are as significant as experiment, for thence comes quiet to the mind." > De Erroribus Medicorum, R. Bacon, 13th century. > "If you don't know what it is, don't poke it." > Ghost in the Shell > > > Dr. Don Latham AJ7LL > Six Mile Systems LLP > 17850 Six Mile Road > POB 134 > Huson, MT, 59846 > VOX 406-626-4304 > Skype: buffler2 > www.lightningforensics.com > www.sixmilesystems.com > > > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
