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LF: RE: 504khz harmonic.

To: <[email protected]>
Subject: LF: RE: 504khz harmonic.
From: "Dave G3WCB" <[email protected]>
Date: Mon, 20 Jul 2009 23:04:58 +0100
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Hi, Gary.
 
It's not your Mini-Whip. I get the same effect on my "Tee" transmitting antenna. Argo screenshot attached.
 
73m Dave G3WCB IO91rM nr Windsor, S.E. England.
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Gary - G4WGT
Sent: 20 July 2009 11:13
To: LF -RSGB LF Group
Subject: LF: 504khz harmonic.

Hi All,

 

Occasionally recently I have been seeing strange patterns around the harmonic line received on my SpecLab grabbers on 504kHz from the broadcast station at 252kHz.

 

The patterns are not just seen using the Softrock SDR Rx but also with my JRC NRD-345, the only common device is the Mini-Whip active antenna.

 

I seem to remember some while ago comments on this LF Forum regarding that station carrying out some experiments or tests involving digital data or something similar.

 

I wonder if this is an effect of those tests as there were concerns that it may cause interference on the 500kHz amateur band.

 

Capture attached.

 

73,

 

Gary - G4WGT - IO83QO.

 

 
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