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Date: Sat, 6 Feb 2010 23:50:43 +0100
Message-ID: <38A51B74B884D74083D7950AD0DD85E82A1AEE@File-Server-HST.hst.e-technik.tu-darmstadt.de>
Thread-Topic: active ant on metallic mast
Thread-Index: AcqnLBzyrShBW58pQ76YPb9JbK7HfgAGwooBAAb2dyAABTAOeA==
References: <BDEMKFCNLMIILGIFNONNIEIDDHAA.victor13@online.nl>
From: =?iso-8859-1?Q?Stefan_Sch=E4fer?= <schaefer@hst.tu-darmstadt.de>
To: <rsgb_lf_group@blacksheep.org>
Content-Type: multipart/mixed;
	boundary="----_=_NextPart_001_01CAA77E.D06143B9"
Subject: LF: AW: RE: active ant on metallic mast
Sender: owner-rsgb_lf_group@blacksheep.org
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Reply-To: rsgb_lf_group@blacksheep.org


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Hi Victor,=20
=20
Where can i get the design of your preamp? Is it a broad band design or al=
so with some band pass filters? Is it with FETs and/or with OP amps? 28V?=
 I assume +-14V, right? ;-)
Is in this shed a 230V supply or is it completely ("electrically") apart=
 from the house?
=20
"Less qrm and higher output", does this mean the noise level itself decrea=
sed, so not compared to the wanted signal? If hight increases and the infl=
uence of surrounding lossy things decreases, the E-Field and thus the inpu=
t voltage increases, and thus the SNR, if noise level remains the same. An=
d if you then decrease the AF of your RX to get again a proper visible sig=
nal in e.g. Argo, the noise gets into the background. But does the noisele=
vel itself decreases also significantly? If so, there must be a noise sour=
ce in the near of the shed, isn't it?
=20
I think when i will do the test with the active antenna with the 2 UKW var=
iable antennas, i will mount it to the kite and look how it depends when=
 it is 50m above ground, completely isolated. Perhaps not very useful but=
 interesting ;-)
=20
You decreased the lenght from 1m to 60cm. Have you also tried 30cm?
A hight of 7m gave the best results you said. So things get worse, when yo=
u go to 10m hight?? If so, what do you think is the reason for that? Or is=
 the shed under a 400kV power line? ;-)
=20
Victor and Roelof, tnx for your hints and ideas. I like that conversation=
 and i like to try mni unusual things. A receiving loop will give the best=
 signal i assume, but it is not very easy to handle if one is always /p.=
=20
=20
Congrats to the canadian stns to be back on LF!! Hpe to get a contact to=
 VO1NA next! But since 6 weeks there is almost no wind at weekend, the lon=
gest break since 2 years :-( But i will be back with a big signal :-)
=20
73, Stefan/DK7FC
=20
=20

________________________________

Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von victor13@online.nl
Gesendet: Sa 06.02.2010 20:46
An: rsgb_lf_group@blacksheep.org
Betreff: LF: RE: active ant on metallic mast


Hello Stefan,Roelof,
=20
for about 4 years now I am using an active whip with good results.The ante=
nna is placed on a shed about 10 m from the house.I varied the height betw=
een 2 m and 9 m.With a height of 2 m(the roof) I had alot of qrm and a low=
 output,raising it to 5m or higher improved things a lot.Less qrm and high=
er output,to prevent im i decreased the size of the whip from 1m to 60 cm.=
At a height of 7m this gives the besr results.no detectable im from local=
 mw stations and a good S/N ratio of weak signals.As an experiment I repla=
ced the steel pole for a glassfibre one,this didn't change any thing.This=
 could be espected because of the coax cable you are always at the same po=
tential as with a steel pole.Ofcourse  using a battery and a glassfibre ch=
anges things but for me this is not very practical because my whip draws=
 120mA @ 28V.
Hope to hear more from your experiments,
=20
73
Victor
PA3FNY

    -----Oorspronkelijk bericht-----
    Van: Stefan Sch=E4fer [mailto:owner-rsgb_lf_group@blacksheep.org]Namen=
s Stefan Sch=E4fer
    Verzonden: zaterdag 6 februari 2010 17:47
    Aan: rsgb_lf_group@blacksheep.org
    Onderwerp: LF: active ant on metallic mast
   =20
   =20
    Hi Roelof, LF,
    =20
    Roelof, why do you think that this is the case? Interesting Question!=
 "Won't work" means "Won't work properly" it assume. There will be a signa=
l but perhaps it is not optimal. And why could this be the case? If the ap=
plication is in a metallic housing that is mounted to a metallic mast, the=
 capacity of the "ground electrode" against the environment must be very=
 high (can be seen as infinite, i assume), compared to the active element=
 (gate of the FET). Perhaps there will also be a better coupling to qrm so=
urces? I also have to make some measurements. The antennas we use are comp=
arale i think. So we could share (all) share our experiences :-)
    =20
    A special question comes up when a optic fiber cable is used, since in=
 a coax application there remains a high C of the ground electrode, even=
 when a symmetrical transformer is used (since the active element has just=
 a few pF to the far field). That special question is: What will happen,=
 when the case/ground electrode becomes small against the active element=
 (e.g. circuit in SMD, small battery inside)?! Will there be a change in=
 the optimal C of the active element to the far field? I assume, then, one=
 has to define an optimal C ratio of both electrodes. Will it behave as a=
 short dipole? And what about a short vertical (30cm) active antenna that=
 is directly placed on the ground with a almost ideal conducting ground pl=
ane, e.g. aluminium foil (out of the household) in a radius of 1m (ignorin=
g the local qrm problem, so e.g. in your garden, apart from the city)?
    =20
    On my new qth i made first steps to receive LF with the active antenna=
 mounted just 2m above ground but hung up on a wet tree. Results were vy=
 bad. I thought that SNR could be better when increasing the active elemen=
t since signals were weak (DCF39 at S7), but it wasn't. The optimal length=
 was still 30cm. That seems not only to be "sufficient" but rather optimal=
! So less and more is worse, unaffected by the hight above gnd?
    =20
    I think one has to imagine the E-Field lines that are going through th=
e ambience. The fieldstrength seems just to be very small in a lossy envir=
onment (on my hill, where no trees can be found, the antenna was also 2m=
 up and DCF39 was S9+20). So hight above ground seems to essencial, even=
 without local qrm. Each decrease of input signal can be compensated by mo=
re gain but SNR decreases, of course.
    =20
    What are your ideas to these thoughts? What do you think will happen=
 if the ground-electrode-C becomes small against the C of the active eleme=
nt? What will be the optimum C for both? Will the electrodes have the same=
 "importance", like as a short dipole? Questions over Questions ;-)=20
    =20
    Recently i had the idea to test that with a variable antenna of a /p=
 UKW radio, perhaps two for each electrode. That will be interesting to pl=
ay with ;-)
    =20
    73!! Stefan/DK7FC

________________________________

    Von: owner-rsgb_lf_group@blacksheep.org im Auftrag von Roelof Bakker
    Gesendet: Sa 06.02.2010 13:53
    An: rsgb_lf_group@blacksheep.org
    Betreff: Re: LF: AW: Re: test signal wanted
   =20
   =20

    Hello Stefan,
   =20
    Probably a bit late, bit I have been told that an active whip won't wo=
rk=20
    well on a metalic mast.
    I never tried it myself (still on the to do list) due to lack of a=20
    suitable mast.
   =20
    73,
    Roelof, pa0rdt
   =20
   =20

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