Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]

Re: LF: VO1NA CW 477.7 kHz

To: [email protected]
Subject: Re: LF: VO1NA CW 477.7 kHz
From: Andy Talbot <[email protected]>
Date: Tue, 8 Mar 2016 16:05:22 +0000
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to; bh=V/uKHj/Z1cdRepYV0nJCBuPkr+wG6bDRtJDm7X0lgsM=; b=kGDovmSdxdwf0eb0oJiSoqMknM6t2B9jmd4ozm9cm5NSIou80dBfIrDm7lI1Va5xva vYZGd/gYEDULg0DzmhYnvnh0v2zVjwzEhfaic/9B2r2RUghd/xs1a8e/7ayCYwNDi1UX Sf3M5Y8BRUvF5l9l+Had59vHFuG9iFCKfYstdXY+bIVSRYENw9SsyN8EIf6W3KhVCnUe QAEawynNnnCqvkvVSi9gT5LTsaEIszdHTgrTETRgZowBkh+L2U19YKs7/UYkjmFoouLF noXvg5GJLjTdhuM+wH5XHuifhC5Z9buJgmliXWMs4ccInGGR+CeAp4JAz5KhGCjNYe9A 0eqw==
In-reply-to: <6D61ED7030E54FB69566773E90156608@gnat>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <6D61ED7030E54FB69566773E90156608@gnat>
Reply-to: [email protected]
Sender: [email protected]
What is needed, is a software package that runs in parallel, monitoring and recoding the noise level.  It would have to work in a manner that was unaffected by the presence of signals, and also on a receiver without AGC.

Basic software techniques could sort out the first issue (see my piece in the the latest RadCom -plus) and sort noise from narrowband signals.  Any  AGC action could still upset things

Andy  G4JNT


On 8 March 2016 at 14:59, Alan Melia <[email protected]> wrote:
Hi Roelof, thank you for those comments, that was my feeling but there is so much recorded informationI thought it was worth a look and sticking my neck out to see if anyone would say I was all wrong :-))

Yes for preference I would use a continuous carrier/signal but that is not always possible.

Thanks and Best Wishes
Alan
G3NYK
----- Original Message ----- From: "Roelof Bakker" <[email protected]>
To: <[email protected]>; <[email protected]>
Sent: Tuesday, March 08, 2016 2:46 PM
Subject: Re: LF: VO1NA CW 477.7 kHz


Hello all,

Attached last night's reception of VO1NA.
Between 01:15 and 01:25 UTC, marginal aural copy was possible in CW
mode and good aural copy in Linrad's coherent mode.
As can be seen, the band noise is much lower than the previous
night.

Alan, regarding the use of WSPR for propagation study, due to the
rapid fading on 475 kHz, a continuous signal is called for and most
WSPR stations don't provide this.

The S/N indication of WSPR is nice, but useless for propagation
study as the background noise shows a lot of variation over the
course of the night and from night to night as can be seen in my
overnight Linrad fast playback screen shots.

Best regards,
Roelof
====================================================================
From: Roelof Bakker, PAoRDT
Location: Middelburg, Zealand SW Netherlands, 51 30 02 N, 03 36 02 E
Locator: JO11tm
Receiver hardware: Afedri SDR
Receiver software: Linrad
Aerial: pa0rdt-mini-whip, 5 metre up in a hawthorn tree.
====================================================================






--------------------------------------------------------------------------------


The following section of this message contains a file attachment
prepared for transmission using the Internet MIME message format.
If you are using Pegasus Mail, or any other MIME-compliant system,
you should be able to save it or view it from within your mailer.
If you cannot, please ask your system administrator for assistance.

  ---- File information -----------
    File:  VO1NA20160308.gif
    Date:  8 Mar 2016, 15:06
    Size:  138310 bytes.
    Type:  GIF-image




<Prev in Thread] Current Thread [Next in Thread>