Hi Peter, Gablingen Kaserne looks abandoned, there's not a single car in the parking lot! Not like in the "good old days" of the cold war in the 1970s and 1980s...
http://www.amerika-in-augsburg.de/index.php?id=1363 73 Frank W3LPL ---- Original message ---- >Date: Tue, 5 Feb 2013 16:14:28 +0100 >From: "Peter Voelpel" <df...@t-online.de> >Subject: Re: Topband: New 160M high performance receiving antenna at W3LPL >To: <topband@contesting.com> > >There is still one in Germany as well: > > http://maps.google.com/?ll=48.45141,10.86574&z=15&t=h > >73 >Peter, DJ7WW > > > >-----Original Message----- >From: Topband [mailto:topband-boun...@contesting.com] On Behalf Of Chuck >Sent: Dienstag, 5. Februar 2013 08:28 >To: topband@contesting.com >Subject: Re: Topband: New 160M high performance receiving antenna at W3LPL > >Much much closer to home for us Pacific NW'ers: > >https://maps.google.com/maps?q=40+43+24+n,+141+19+44+e&hl=en&ll=40.72308,141 >.328892&spn=0.003313,0.006968&sll=40.723876,141.329155&sspn=0.026507,0.05574 >7&t=k&z=18 > >It looks to be operational and is still gated and guarded and has cars >parked at the building. > > >Chuck > > >On 2/4/2013 10:53 AM, donov...@starpower.net wrote: >> Hi Lee, >> >> You can save yourself lots of engineering effort if you simply make >yourself a copy of this one: >> >> >https://maps.google.com/maps?q=40+43+24+n,+141+19+44+e&hl=en&ll=40.72308,141 >.328892&spn=0.003313,0.006968&sll=40.723876,141.329155&sspn=0.026507,0.05574 >7&t=k&z=18 >> >> My former employer (then Sylvania, now General Dynamics Advanced >Information Systems) installed it in 1966 at Misawa Air Base, Japan. I >believe its still exists, but its probably no longer in use due to technical >obsolesence, high maintenance costs and unavailability of spare parts. An >identical array installed at Elmendorf Air Base, Alaska is also still in >existence as far as I know. Maybe you can purchase one of them! >> >> Many copies of the original 40 element German "Wullenwever" array were >built all over USSR shortly after World War II, some may still exist. Among >other things, they tracked the 10 and 20 MHz Sputnik beacons that some of us >recall. >> >> 73 >> Frank >> W3LPL >> >> ---- Original message ---- >>> Date: Mon, 4 Feb 2013 10:13:55 -0800 >>> From: "Lee K7TJR" <k7...@msn.com> >>> Subject: New 160M high performance receiving antenna at W3LPL >>> To: "Robert McGwier" <rwmcgw...@gmail.com>, "Frank Donovan" ><donov...@starpower.net> >>> Cc: "Topband" <topband@contesting.com> >>> >>> Hello Bob and all, Yes I agree on the issue of needing the >>> stable impedance >>> from the elements to drive the passive systems. I still have >>> some questions >>> in my mind about the radials and here is why. I have made >>> many field tests >>> where I measured the actual phase and amplitude differences >>> between two >>> receiving elements where one is held constant and parameters >>> around the >>> other were changed such as ground rods, radials, and such. >>> Both were >>> receiving signal from an equidistant transmitted source. >>> What I can tell you >>> for sure about this is that with a Hi-Z system the phase and >>> amplitude shifts >>> become quite unstable when radials are used. I do not know >>> this to be a >>> fact with loaded elements but I have seen evidence of some >>> received >>> signal shift due to the presence of the radials to the >>> element. This test really >>> opened my eyes about received signals and what objects might >>> affect >>> them. I have plans to buy the NEC4 engine and do some more >>> field tests >>> using another technology that should give me more answers. It >>> is these >>> minute details that prevent us from making these RX antennas >>> even smaller. >>> There is no doubt that the state of the art is advancing in >>> receiving antenas >>> with all the work that is and has gone on. I am confident >>> that what we are >>> presently doing is not perfect and I expect the state of the >>> art still has a ways >>> to go. There have been many man years of work by many people. >>> I hesitate >>> to name calls but a few notables are K6SE, W7IUV, W8JI, K9AY, >>> W3LPL, >>> W5ZN, W1FV, NX4D, N4IS, AA7J, K1LT and many many others that >>> I >>> apologize for not having the space here or personal memory at >>> the moment >>> to mention. There are more man years of work to do. >>> I still covet the 96 element Wullenwever antenna invented >>> around 1940! >>> Lee K7TJR >>> >>> >The issue is getting sufficient ground radials so that >>> changing soil conditions: dry season, wet season, etc have >>> minimal impact on the impedance which is the easiest >>> measurement of the changing conditions. Joel and I did >>> measurements several times and when he was near drought he >>> found he had to add radials to stabilize the performance. >>> Once done, his system has been stable since. >>> Great news on both of you successfully deploying. >>> Bob >>> >N4HY >>> >>> >> _________________ >> Topband Reflector >> >> > >_________________ >Topband Reflector > >_________________ >Topband Reflector _________________ Topband Reflector