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G8MNY > ALL 01.09.14 14:04l 38 Lines 1166 Bytes #999 (0) @ GBR
BID : 9018_GB7CIP
Read: GUEST
Subj: Re 14100kHx WIDE BAND BUZZ
Path: IW8PGT<CX2SA<VK2DOT<VK4TUB<NA7KR<GB7JED<GB7CIP
Sent: 140829/1505Z @:GB7CIP.#32.GBR.EURO #:9018 [Caterham Surrey GBR] $:9018_GB
From: G8MNY@GB7CIP.#32.GBR.EURO
To : ALL@GBR
Paul sent.....
From : G4APL
Date/Time : 29-Aug-14 15:27
Subject : 14100zHZ WIDE BAND BUZZ
Hi all in GBR
Are any of you experiencing the Wideband Buzz between 14079.00-14119.00kHz
seems to be Mains bourne 59+40db's. Is then being produced the EDF electricty
company. Location NE Surrey.
Is the Se England wide
73 de Paul g4apl
--------------------------------------
Looking at it in South Croydon on a nest of dipoles it is very strong S9+40dB.
With my Rx in FM in on a dusl beam scope it is clearly a FM wobulator type
signal deviating +/-20KHz at 50Hz, but not mains locked!
______
Y1 ____| |_ 50Hz mains Scope Cal signal
Y2 .,.,..|\ .., Not locked moving
\| slowly across screen
Quicly tunning Rx the Trace moves left right a bit until the signal is not all
in the FM Rx.
In SSB U get a sweep of AF frequencies 300-2k7 in a 50Hz pulse. This is anoying
as it contains all the comms speech frequencies, so just a whisker of the wide
signal in the passband makes the contact unusable.
Other buzzes here on LF/MF/HF bands are all mains locked!
73 De John G8MNY
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