Topband: New 160M high performance receiving antenna at W3LPL

Wed Feb 6 11:05:26 EST 2013

There is one in Portugal also, dont remember how much is still standing, 
havent been there for almost 20 years.

The US versions were the FRD-10 and the FLR-9 and built into the 70's and 
the Japanese built a pair in the 80's and may still be using them.

Carl
KM1H

----- Original Message ----- 
From: "Peter Voelpel" <df3kv at t-online.de>
To: <topband at contesting.com>
Sent: Tuesday, February 05, 2013 10:14 AM
Subject: Re: Topband: New 160M high performance receiving antenna at W3LPL

> 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
>>>
>>>
>> _________________
>> Topband Reflector
>>
>>
>
> _________________
> Topband Reflector
>
> _________________
> Topband Reflector
>
>
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