Message-ID: <6814B311A817473C8285E3720DC0244A@acer>
From: "henny van elst" <cpm@planet.nl>
To: <rsgb_lf_group@blacksheep.org>
References: <4E418609.6020500@iup.uni-heidelberg.de> <67A6F7BF45BF4A0193A3DCB53000A283@PcMinto> <008401cc56ce$2f1fb2c0$0401a8c0@xphd97xgq27nyf> <12C475F3F4C84B818461753F2E8A60A6@PcMinto> <4E41AECB.90808@iup.uni-heidelberg.de> <8D68749D37B94275855FDBA46A3F6C97@PcMinto>  <op.vz0iyui5yzqh0k@pc-roelof> <1313033619.1543.20.camel@gerhard-desktop> <4E438B8B.1060800@iup.uni-heidelberg.de> <00c401cc5826$49523e70$71a9c00a@Clemens04> <1313074781.1701.7.camel@gerhard-desktop> <25D9CE8E-70C7-4FB5-8A10-0ED6B94255EE@numeo.fr> <1313090065.1579.46.camel@gerhard-desktop>
Date: Sun, 14 Aug 2011 11:27:07 +0200
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Subject: Re: LF: Re: HB9ASB...
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Hello Gerhard,
can You give me the addres to order a fiberglasmast?

henny pa3cpm
best 73's

----- Original Message ----- 
From: "Gerhard Hickl" <gerhard.hickl@aon.at>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, August 11, 2011 9:14 PM
Subject: Re: LF: Re: HB9ASB...


> John!
>
> Actually there is no special guying used since the mast is only the
> lower (and thus thicker) section of an originally 10m high "cheap"
> Fibreglass-Pole like available at http://www.dx-wire.de/fiberglasm.htm
>
> It is tied to the chimney with two tension belts which are commonly used
> to fix cargo in a truck. (1 inch wide).
>
> Originally this method of fixing to the chimney was just thought to be
> for testing but meanwhile it is up there for more than a year.
>
> The two probes (LF/VLF) on top of the mast are suspended by a string
> which enables me to maintain the probes without bringing the pole down.
>
> 73
> OE3GHB
> Gerhard
>
>
>
>
>
>
>
>
>
> Am Donnerstag, den 11.08.2011, 17:58 +0200 schrieb John Rabson:
>> Gerhard,
>>
>> What guying arrangements do you use for the 5m mast, please?
>>
>> 73
>> John F5VLF
>>
>> On 11 Aug 2011, at 16:59CEST, Gerhard Hickl wrote:
>>
>> > Clemens, LF group!
>> >
>> > This is exactly the opposite that I experienced with the Mini-Whip.
>> >
>> > The higher I brought it up (= the farther I brought it away from the
>> > noise source, commonly called "house"), the better the SNR.
>> >
>> > Today I connected the shield of the cable to the lightning protection
>> > system up on the roof and couldn't find any difference so far.
>> >
>> > I'm using a 5m fibre-glass pole fixed to the chimney as a support for
>> > the probe and the shield of the feeder is only grounded in the shack.
>> >
>> > 73
>> >
>> > OE3GHB
>> > Gerhard
>> >
>> >
>> >
>> >
>> >
>> > Am Donnerstag, den 11.08.2011, 13:32 +0200 schrieb Clemens Paul:
>> >> Hi Stefan,
>> >>
>> >>> The pole that is on a noisy roof (and its noisy ground) and on the 
>> >>> other side
>> >>> the pole that is far away in the garden, with its own and clean local 
>> >>> earth.
>> >>> In the garden a metallic pole should make no difference, as you say.
>> >>
>> >> How true.
>> >> My miniwhip was completely unusable on the top of my roof,
>> >> with or without connecting the coax shield to the lightning
>> >> gr.. ehm reference plane.
>> >> So I decided to put it in the middle of thegarden where it is only 
>> >> 30cm
>> >> above the lawn.
>> >> Here connecting the coax braid to a 3m long earth rod was essential
>> >> to get rid of the noise.
>> >> Now this setup is good enough for receiving SAQ with up to 30dB S/N.
>> >>
>> >> 73
>> >> Clemens
>> >> DL4RAJ
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> ----- Original Message ----- 
>> >> From: "Stefan Schäfer" <Stefan.Schaefer@iup.uni-heidelberg.de>
>> >> To: <rsgb_lf_group@blacksheep.org>
>> >> Sent: Thursday, August 11, 2011 9:58 AM
>> >> Subject: Re: LF: Re: HB9ASB...
>> >>
>> >>
>> >>> Hi Gerhard,
>> >>>
>> >>> I think one has to compare two different situations:
>> >>>
>> >>> The pole that is on a noisy roof (and its noisy ground) and on the 
>> >>> other side
>> >>> the pole that is far away in the garden, with its own and clean local 
>> >>> earth.
>> >>> In the garden a metallic pole should make no difference, as you say.
>> >>>
>> >>> 73, Stefan
>> >>>
>> >>>
>> >>> Am 11.08.2011 05:33, schrieb Gerhard Hickl:
>> >>>> Roelof!
>> >>>>
>> >>>> With interest I was following all the discussions about the "Mini
>> >>>> Whip"-like antennas.
>> >>>>
>> >>>> In your description of the "PA0RDT Mini Whip" you suggest to use a 
>> >>>> non
>> >>>> metallic pole for mounting the probe and an (optional) earth-rod to
>> >>>> ground (sorry Andy!!) the shield.
>> >>>>
>> >>>> I might be completely wrong but isn't it the same when one uses a
>> >>>> grounded metallic pole and connect the shield of the coax on top of 
>> >>>> this
>> >>>> pole?
>> >>>>
>> >>>> BTW: I have an insulating pole (5m) on top of the roof and yet no
>> >>>> grounded shielding of the coax but just in the shack. I will connect 
>> >>>> the
>> >>>> shield to the lightning protection system at the bottom of the pole 
>> >>>> and
>> >>>> see about the difference.
>> >>>>
>> >>>> Actually it isn't even a true coax cable but a singe shielded 
>> >>>> twisted
>> >>>> pair where the two inner wires are in parallel....Z=? Who knows????
>> >>>>
>> >>>> So considering my "fluffy" set-up, I think my VLF grabber is 
>> >>>> performing
>> >>>> very well but for sure there is room for improvements as well.
>> >>>>
>> >>>>
>> >>>>
>> >>>> 73
>> >>>> OE3GHB
>> >>>> Gerhard
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>> Am Mittwoch, den 10.08.2011, 21:26 +0200 schrieb Roelof Bakker:
>> >>>>
>> >>>>> Hello Minto, Stefan,
>> >>>>>
>> >>>>> Some food for thoughts:
>> >>>>>
>> >>>>> When I tested a mini-whip in the garden with battery feed and also 
>> >>>>> with a
>> >>>>> battery fed SLM, I found the noise lower than when used inside and
>> >>>>> operated from the mains.
>> >>>>>
>> >>>>> The coax cable from the house station was connected in parallel 
>> >>>>> with the
>> >>>>> mini-whip by means of a BNC T-piece.
>> >>>>> The noise increased by 9 dB. My assumption is that this noise is 
>> >>>>> received
>> >>>>> on the shield of the coax inside the house.
>> >>>>>
>> >>>>> Without connecting the shield to a separate radio earth, the noise
>> >>>>> received on the shield inside the house will travel over the shield 
>> >>>>> all
>> >>>>> the way to the antenna. There the noise will be received by the 
>> >>>>> sensitive
>> >>>>> probe. This will be by means of capacitively coupling, I guess. 
>> >>>>> Many
>> >>>>> people have reported a large drop in local noise by connecting the 
>> >>>>> shield
>> >>>>> at the bottom of the mast.
>> >>>>> This also applies to normal active whips of course.
>> >>>>>
>> >>>>> 73,
>> >>>>> Roelof, pa0rdt
>> >>>>>
>> >>>>>
>> >>>>
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>> -----
>> >>> eMail ist virenfrei.
>> >>> Von AVG überprüft - www.avg.de
>> >>> Version: 10.0.1392 / Virendatenbank: 1520/3826 - Ausgabedatum: 
>> >>> 10.08.2011
>> >>
>> >>
>> >
>> >
>> >
>> >
>>
>>
>
>
>
>
>
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