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Re: LF: Circa 144kHz noise hump

To: Chris Wilson <[email protected]>
Subject: Re: LF: Circa 144kHz noise hump
From: Chris Wilson <[email protected]>
Date: Wed, 14 Dec 2016 17:20:18 +0000
In-reply-to: <[email protected]>
Organization: Gatesgarth Developments
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Hello Chris,

Wednesday, December 14, 2016

Sorry,  not sure what happened with the link, Marcus spotted the error
and it should be:

Best regards,
 Chris  2E0ILY                          mailto:[email protected]

 My part time LF grabber is at

> 14 December 2016

> Thanks to all who have helped both here and by e-mail. Turning off the
> mains  into  the  house and workshop and running my laptop on internal
> battery  and  the  IDC receiver on a 12V accumulator saw a very slight
> degradation  in  the  noise,  but nothing of significance. It has been
> mentioned  this  noise  hump  may  be caused by a mixing of high level
> signals  and the way the front end of the IDC receiver is constructed.
> i  have  had the idea of using HDSDR to record this noise in RF and AF
> format.  If  someone  using  HDSDR  has  the  time  and inclination to
> download  the .wav file and play it on their PC maybe their experience
> could suggest what it may be? HDSDR allows one to look at it in SSB or
> AF  or  even  FM  modes.  I recorded about a minute of it. the pulsing
> noise  at  about  1.5  second  or  so intervals is the electric cattle
> fence,  and  yes, I turned that off as a fisrt step in ID'ing it, plus
> it  goes  off  if  the  mains  to  the house is turned off. It made no
> difference to the noise hump :(

> The file is at:

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