Message-ID: <A25F36D6F96E4388A619972DEC3C3413@Extensa>
From: "PA1SDB, Peter" <pa1sdb@amsat.org>
To: <rsgb_lf_group@blacksheep.org>
References: <1FFFC71EA0BE4176BEFFBF7D095D3BA9@Extensa> <4106A79FDAE74690B0A2C710BDA51B55@Extensa> <op.wbqlcpmmyzqh0k@pc-roelof> <CC3377BE451E4A909D53E8EA147984EF@Extensa> <op.wbqo1auvyzqh0k@pc-roelof> <C6155D5ADA2246218DFC5ED73967F826@Extensa> <4F70AB22.3030600@kpnmail.nl>
In-Reply-To: <4F70AB22.3030600@kpnmail.nl>
Date: Tue, 27 Mar 2012 05:25:46 -0000
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Subject: Re: LF: Re: Power experiment  / Mini Whip / 8970 Hz !
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Hello Jan,
Tnx for your information.
I tried already several way's of powering the Mini Whip, but only a battery is clean.
All others who are connected to 230 volt mains give noise or QRM.
I'll continue and try to find a way out.

73's for now, Peter PA1SDB


----- Original Message ----- 
From: "pa3abk" <pa3abk@kpnmail.nl>
To: <rsgb_lf_group@blacksheep.org>
Sent: Monday, March 26, 2012 5:45 PM
Subject: Re: LF: Re: Power experiment / Mini Whip / 8970 Hz !


> Peter,
> 
> It's a known problem also here.
> There are several ways to prevent that noise slip into the DC feederlines.
> Assume that every situation will be different for each of us, depending 
> the source of the interferrence.
> 
> Dallas Lankford wrote a small article about this in the past.
> Maybe it has some idea's to get things under control at your end.
> 
> http://antenadx.com.br/PDF/Antenas%20ativas/LowNoiseActiveAntennasAC-DCPowerSuppliesII.pdf
> 
> Dallas is more focussed on MW, but some of his articles are useable on LF.
> Initally those files were stored on kongsfjord.no but for some reason 
> they moved to "somewhere" in the Yahoo groups.
> Which explains the strange internet location: somewhere in Brazil.  It 
> was the best my friend Google could provide at the moment.
> 
> Jan/pa3abk
> 
> 
> 
> 
> On 26-3-2012 7:40, PA1SDB, Peter wrote:
>> Hello Roelof, VLF, LF, but also HF, VHF, UHF and SHF :-)
>> Today I will try to ad some stabilyzers, filters, C's and Choces at 
>> the powers supply Mini Whip input.
>>
>> That single 9 volt battery block was empty after 12 hours.
>> It did drop from 9.4 to 7.3 in 12 h.
>> A bit expensive to buy 2x 9v batery's a day :-)
>>
>> 73's Peter, PA1SDB
>>
>> http://www.qsl.net/pa1sdb/
>>
>>
>>
> 
> 
> -- 
> pa3abk<->  dordrecht jo21it
> 
>