Topband: New 160M high performance receiving antenna at W3LPL

[Lup Schlueter]

Still more in Germany, there is a half one  pointed to UA0 and still 
in use:

http://goo.gl/maps/eXGtY

but wait, the next not far away is west of Flensburg just right at 
the danisch border:

http://goo.gl/maps/05ufM

It is also still manned.

Who will find all of those impressive gadgets in Germany?

(((((((((73)))))))
Lup /DJ7SW


Am 05.02.2013 15:14, schrieb Peter Voelpel:
> 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-bounces at contesting.com] On Behalf Of Chuck
> Sent: Dienstag, 5. Februar 2013 08:28
> To: topband at 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, donovanf at 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" <k7tjr at msn.com>
>>> Subject: New 160M high performance receiving antenna at W3LPL
>>> To: "Robert McGwier" <rwmcgwier at gmail.com>, "Frank Donovan"
> <donovanf at starpower.net>
>>> Cc: "Topband" <topband at 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
>>>
>>>
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