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" <[email protected]>
To: <[email protected]>
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
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